16357938490

Committed 17 Jul 2025 11:06PM UTC coverage: 65.244% (-0.1%) from 65.359%

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Commit Message

TRUNK-6318: Add S3 Storage Service (#5110)

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/api/src/main/java/org/openmrs/module/ModuleFactory.java

/**
 * This Source Code Form is subject to the terms of the Mozilla Public License,
 * v. 2.0. If a copy of the MPL was not distributed with this file, You can
 * obtain one at http://mozilla.org/MPL/2.0/. OpenMRS is also distributed under
 * the terms of the Healthcare Disclaimer located at http://openmrs.org/license.
 * 
 * Copyright (C) OpenMRS Inc. OpenMRS is a registered trademark and the OpenMRS
 * graphic logo is a trademark of OpenMRS Inc.
 */
package org.openmrs.module;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.SortedMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutionException;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.aopalliance.aop.Advice;
import org.openmrs.GlobalProperty;
import org.openmrs.Privilege;
import org.openmrs.api.APIException;
import org.openmrs.api.AdministrationService;
import org.openmrs.api.OpenmrsService;
import org.openmrs.api.context.Context;
import org.openmrs.api.context.Daemon;
import org.openmrs.module.Extension.MEDIA_TYPE;
import org.openmrs.util.CycleException;
import org.openmrs.util.DatabaseUpdater;
import org.openmrs.util.Graph;
import org.openmrs.util.InputRequiredException;
import org.openmrs.util.OpenmrsClassLoader;
import org.openmrs.util.OpenmrsConstants;
import org.openmrs.util.OpenmrsUtil;
import org.openmrs.util.PrivilegeConstants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.aop.Advisor;
import org.springframework.context.support.AbstractRefreshableApplicationContext;
import org.springframework.util.StringUtils;

import liquibase.Contexts;

/**
 * Methods for loading, starting, stopping, and storing OpenMRS modules
 */
public class ModuleFactory {
        
        private ModuleFactory() {
        }
        
        private static final Logger log = LoggerFactory.getLogger(ModuleFactory.class);
        
        protected static final Cache<String, Module> loadedModules = CacheBuilder.newBuilder()
                .softValues().build();
        
        protected static final Cache<String, Module> startedModules = CacheBuilder.newBuilder()
                .softValues().build();
        
        protected static final Map<String, List<Extension>> extensionMap = new HashMap<>();
        
        // maps to keep track of the memory and objects to free/close
        protected static final Cache<Module, ModuleClassLoader> moduleClassLoaders = CacheBuilder.newBuilder().weakKeys()
                .softValues().build();
        
        private static final Map<String, Set<ModuleClassLoader>> providedPackages = new ConcurrentHashMap<>();
        
        // the name of the file within a module file
        private static final String MODULE_CHANGELOG_FILENAME = "liquibase.xml";
        
        private static final Cache<String, DaemonToken> daemonTokens = CacheBuilder.newBuilder().softValues().build();
        
        private static final Set<String> actualStartupOrder = new LinkedHashSet<>();
        
        /**
         * Add a module (in the form of a jar file) to the list of openmrs modules Returns null if an error
         * occurred and/or module was not successfully loaded
         *
         * @param moduleFile
         * @return Module
         */
        public static Module loadModule(File moduleFile) throws ModuleException {
                
                return loadModule(moduleFile, true);
                
        }
        
        /**
         * Add a module (in the form of a jar file) to the list of openmrs modules Returns null if an error
         * occurred and/or module was not successfully loaded
         *
         * @param moduleFile
         * @param replaceIfExists unload a module that has the same moduleId if one is loaded already
         * @return Module
         */
        public static Module loadModule(File moduleFile, Boolean replaceIfExists) throws ModuleException {
                Module module = new ModuleFileParser(Context.getMessageSourceService()).parse(moduleFile);
                
                if (module != null) {
                        loadModule(module, replaceIfExists);
                }
                
                return module;
        }
        
        /**
         * Add a module to the list of openmrs modules
         *
         * @param module
         * @param replaceIfExists unload a module that has the same moduleId if one is loaded already
         *            <strong>Should</strong> load module if it is currently not loaded
         *            <strong>Should</strong> not load module if already loaded <strong>Should</strong>
         *            always load module if replacement is wanted <strong>Should</strong> not load an older
         *            version of the same module <strong>Should</strong> load a newer version of the same
         *            module
         * @return module the module that was loaded or if the module exists already with the same version,
         *         the old module
         */
        public static Module loadModule(Module module, Boolean replaceIfExists) throws ModuleException {
                
                log.debug("Adding module {} to the module queue", module.getName());
                
                Module oldModule = getLoadedModulesMap().get(module.getModuleId());
                if (oldModule != null) {
                        int versionComparison = ModuleUtil.compareVersion(oldModule.getVersion(), module.getVersion());
                        if (versionComparison < 0) {
                                // if oldModule version is lower, unload it and use the new
                                unloadModule(oldModule);
                        } else if (versionComparison == 0) {
                                if (replaceIfExists) {
                                        // if the versions are the same and we're told to replaceIfExists, use the new
                                        unloadModule(oldModule);
                                } else {
                                        // if the versions are equal and we're not told to replaceIfExists, jump out of here in a bad way
                                        throw new ModuleException("A module with the same id and version already exists", module.getModuleId());
                                }
                        } else {
                                // if the older (already loaded) module is newer, keep that original one that was loaded. return that one.
                                return oldModule;
                        }
                }
                
                getLoadedModulesMap().put(module.getModuleId(), module);
                
                return module;
        }
        
        /**
         * Load OpenMRS modules from <code>OpenmrsUtil.getModuleRepository()</code>
         */
        public static void loadModules() {
                
                // load modules from the user's module repository directory
                File modulesFolder = ModuleUtil.getModuleRepository();
                
                log.debug("Loading modules from: {}", modulesFolder.getAbsolutePath());
                
                File[] files = modulesFolder.listFiles();
                if (modulesFolder.isDirectory() && files != null) {
                        loadModules(Arrays.asList(files));
                } else {
                        log.error("modules folder: '" + modulesFolder.getAbsolutePath() + "' is not a directory or IO error occurred");
                }
        }
        
        /**
         * Attempt to load the given files as OpenMRS modules
         *
         * @param modulesToLoad the list of files to try and load <strong>Should</strong> not crash when
         *            file is not found or broken <strong>Should</strong> setup requirement mappings for
         *            every module <strong>Should</strong> not start the loaded modules
         */
        public static void loadModules(List<File> modulesToLoad) {
                // loop over the modules and load all the modules that we can
                for (File f : modulesToLoad) {
                        if (f.exists()) {
                                // ignore .svn folder and the like
                                if (!f.getName().startsWith(".")) {
                                        try {
                                                // last module loaded wins
                                                Module mod = loadModule(f, true);
                                                log.debug("Loaded module: " + mod + " successfully");
                                        }
                                        catch (Exception e) {
                                                log.error("Unable to load file in module directory: " + f + ". Skipping file.", e);
                                        }
                                }
                        } else {
                                log.error("Could not find file in module directory: " + f);
                        }
                }
                
                //inform modules, that they can't start before other modules
                
                Map<String, Module> loadedModulesMap = getLoadedModulesMapPackage();
                for (Module m : loadedModulesMap.values()) {
                        Map<String, String> startBeforeModules = m.getStartBeforeModulesMap();
                        if (startBeforeModules.size() > 0) {
                                for (String s : startBeforeModules.keySet()) {
                                        Module mod = loadedModulesMap.get(s);
                                        if (mod != null) {
                                                mod.addRequiredModule(m.getPackageName(), m.getVersion());
                                        }
                                }
                        }
                }
        }
        
        /**
         * Try to start all of the loaded modules that have the global property <i>moduleId</i>.started is
         * set to "true" or the property does not exist. Otherwise, leave it as only "loaded"<br>
         * <br>
         * Modules that are already started will be skipped.
         */
        public static void startModules() {
                
                // loop over and try starting each of the loaded modules
                if (!getLoadedModules().isEmpty()) {
                        
                        List<Module> modules = getModulesThatShouldStart();
                        
                        try {
                                modules = getModulesInStartupOrder(modules);
                        }
                        catch (CycleException ex) {
                                String message = getCyclicDependenciesMessage(ex.getMessage());
                                log.error(message, ex);
                                notifySuperUsersAboutCyclicDependencies(ex);
                                modules = (List<Module>) ex.getExtraData();
                        }
                        
                        // try and start the modules that should be started
                        for (Module mod : modules) {
                                
                                if (mod.isStarted()) {
                                        // skip over modules that are already started
                                        continue;
                                }
                                
                                // Skip module if required ones are not started
                                if (!requiredModulesStarted(mod)) {
                                        String message = getFailedToStartModuleMessage(mod);
                                        log.error(message);
                                        mod.setStartupErrorMessage(message);
                                        notifySuperUsersAboutModuleFailure(mod);
                                        continue;
                                }
                                
                                try {
                                        log.debug("starting module: {}", mod.getModuleId());
                                        startModule(mod);
                                }
                                catch (Exception e) {
                                        log.error("Error while starting module: " + mod.getName(), e);
                                        mod.setStartupErrorMessage("Error while starting module", e);
                                        notifySuperUsersAboutModuleFailure(mod);
                                }
                        }
                }
        }
        
        /**
         * Obtain the list of modules that should be started
         *
         * @return list of modules
         */
        private static List<Module> getModulesThatShouldStart() {
                List<Module> modules = new ArrayList<>();
                
                AdministrationService adminService = Context.getAdministrationService();
                
                for (Module mod : getLoadedModules()) {
                        
                        String key = mod.getModuleId() + ".started";
                        String startedProp = adminService.getGlobalProperty(key, null);
                        String mandatoryProp = adminService.getGlobalProperty(mod.getModuleId() + ".mandatory", null);
                        
                        // if a 'moduleid.started' property doesn't exist, start the module anyway
                        // as this is probably the first time they are loading it
                        if (startedProp == null || "true".equals(startedProp) || "true".equalsIgnoreCase(mandatoryProp)
                                || mod.isMandatory()) {
                                modules.add(mod);
                        }
                }
                return modules;
        }
        
        /**
         * Sort modules in startup order based on required and aware-of dependencies
         *
         * @param modules list of modules to sort
         * @return list of modules sorted by dependencies
         * @throws CycleException
         */
        public static List<Module> getModulesInStartupOrder(Collection<Module> modules) throws CycleException {
                Graph<Module> graph = new Graph<>();
                
                for (Module mod : modules) {
                        
                        graph.addNode(mod);
                        
                        // Required dependencies
                        for (String key : mod.getRequiredModules()) {
                                Module module = getModuleByPackage(key);
                                Module fromNode = graph.getNode(module);
                                if (fromNode == null) {
                                        fromNode = module;
                                }
                                
                                if (fromNode != null) {
                                        graph.addEdge(graph.new Edge(
                                                fromNode,
                                                mod));
                                }
                        }
                        
                        // Aware-of dependencies
                        for (String key : mod.getAwareOfModules()) {
                                Module module = getModuleByPackage(key);
                                Module fromNode = graph.getNode(module);
                                if (fromNode == null) {
                                        fromNode = module;
                                }
                                
                                if (fromNode != null) {
                                        graph.addEdge(graph.new Edge(
                                                fromNode,
                                                mod));
                                }
                        }
                }
                
                return graph.topologicalSort();
        }
        
        /**
         * Send an Alert to all super users that the given module did not start successfully.
         *
         * @param mod The Module that failed
         */
        private static void notifySuperUsersAboutModuleFailure(Module mod) {
                try {
                        // Add the privileges necessary for notifySuperUsers
                        Context.addProxyPrivilege(PrivilegeConstants.MANAGE_ALERTS);
                        
                        // Send an alert to all administrators
                        Context.getAlertService().notifySuperUsers("Module.startupError.notification.message", null, mod.getName());
                }
                catch (Exception e) {
                        log.error("Unable to send an alert to the super users", e);
                }
                finally {
                        // Remove added privileges
                        Context.removeProxyPrivilege(PrivilegeConstants.MANAGE_ALERTS);
                }
        }
        
        /**
         * Send an Alert to all super users that modules did not start due to cyclic dependencies
         */
        private static void notifySuperUsersAboutCyclicDependencies(Exception ex) {
                try {
                        Context.addProxyPrivilege(PrivilegeConstants.MANAGE_ALERTS);
                        Context.getAlertService().notifySuperUsers("Module.error.cyclicDependencies", ex, ex.getMessage());
                }
                catch (Exception e) {
                        log.error("Unable to send an alert to the super users", e);
                }
                finally {
                        Context.removeProxyPrivilege(PrivilegeConstants.MANAGE_ALERTS);
                }
        }

        /**
         * Convenience method to return a List of Strings containing a description of which modules the
         * passed module requires but which are not started. The returned description of each module is the
         * moduleId followed by the required version if one is specified
         *
         * @param module the module to check required modules for
         * @return List&lt;String&gt; of module names + optional required versions: "org.openmrs.formentry
         *         1.8, org.rg.patientmatching"
         */
        private static List<String> getMissingRequiredModules(Module module) {
                List<String> ret = new ArrayList<>();
                for (String moduleName : module.getRequiredModules()) {
                        boolean started = false;
                        for (Module mod : getStartedModules()) {
                                if (mod.getPackageName().equals(moduleName)) {
                                        String reqVersion = module.getRequiredModuleVersion(moduleName);
                                        if (reqVersion == null || ModuleUtil.compareVersion(mod.getVersion(), reqVersion) >= 0) {
                                                started = true;
                                        }
                                        break;
                                }
                        }
                        
                        if (!started) {
                                String moduleVersion = module.getRequiredModuleVersion(moduleName);
                                moduleName = moduleName.replace("org.openmrs.module.", "").replace("org.openmrs.", "");
                                ret.add(moduleName + (moduleVersion != null ? " " + moduleVersion : ""));
                        }
                }
                return ret;
        }
        
        /**
         * Returns all modules found/loaded into the system (started and not started)
         *
         * @return <code>Collection&lt;Module&gt;</code> of the modules loaded into the system
         */
        public static Collection<Module> getLoadedModules() {
                if (getLoadedModulesMap().size() > 0) {
                        return getLoadedModulesMap().values();
                }
                
                return Collections.emptyList();
        }
        
        /**
         * Returns all modules found/loaded into the system (started and not started) in the form of a
         * map&lt;ModuleId, Module&gt;
         *
         * @return map&lt;ModuleId, Module&gt;
         */
        public static Map<String, Module> getLoadedModulesMap() {
                return loadedModules.asMap();
        }
        
        /**
         * Returns all modules found/loaded into the system (started and not started) in the form of a
         * map&lt;PackageName, Module&gt;
         *
         * @return map&lt;PackageName, Module&gt;
         */
        public static Map<String, Module> getLoadedModulesMapPackage() {
                Map<String, Module> map = new HashMap<>();
                for (Module loadedModule : getLoadedModulesMap().values()) {
                        map.put(loadedModule.getPackageName(), loadedModule);
                }
                return map;
        }
        
        /**
         * Returns the modules that have been successfully started
         *
         * @return <code>Collection&lt;Module&gt;</code> of the started modules
         */
        public static Collection<Module> getStartedModules() {
                if (getStartedModulesMap().size() > 0) {
                        return getStartedModulesMap().values();
                }
                
                return Collections.emptyList();
        }
        
        public static List<Module> getStartedModulesInOrder() {
                List<Module> modules = new ArrayList<>();
                if (actualStartupOrder != null) {
                        for (String moduleId : actualStartupOrder) {
                                modules.add(getStartedModulesMap().get(moduleId));
                        }
                } else {
                        modules.addAll(getStartedModules());
                }
                return modules;
        }
        
        /**
         * Returns the modules that have been successfully started in the form of a map&lt;ModuleId,
         * Module&gt;
         *
         * @return Map&lt;ModuleId, Module&gt;
         */
        public static Map<String, Module> getStartedModulesMap() {
                return startedModules.asMap();
        }
        
        /**
         * @param moduleId
         * @return Module matching module id or null if none
         */
        public static Module getModuleById(String moduleId) {
                return getLoadedModulesMap().get(moduleId);
        }
        
        /**
         * @param moduleId
         * @return Module matching moduleId, if it is started or null otherwise
         */
        public static Module getStartedModuleById(String moduleId) {
                return getStartedModulesMap().get(moduleId);
        }
        
        /**
         * @param modulePackage
         * @return Module matching module package or null if none
         */
        public static Module getModuleByPackage(String modulePackage) {
                for (Module mod : getLoadedModulesMap().values()) {
                        if (mod.getPackageName().equals(modulePackage)) {
                                return mod;
                        }
                }
                return null;
        }
        
        /**
         * @see #startModule(Module, boolean, AbstractRefreshableApplicationContext)
         * @see #startModuleInternal(Module)
         * @see Daemon#startModule(Module)
         */
        public static Module startModule(Module module) throws ModuleException {
                return startModule(module, false, null);
        }
        
        /**
         * Runs through extensionPoints and then calls {@link BaseModuleActivator#willStart()} on the
         * Module's activator. This method is run in a new thread and is authenticated as the Daemon user.
         * If a non null application context is passed in, it gets refreshed to make the module's services
         * available
         *
         * @param module Module to start
         * @param isOpenmrsStartup Specifies whether this module is being started at application startup or
         *            not, this argument is ignored if a null application context is passed in
         * @param applicationContext the spring application context instance to refresh
         * @throws ModuleException if the module throws any kind of error at startup or in an activator
         * @see #startModuleInternal(Module, boolean, AbstractRefreshableApplicationContext)
         * @see Daemon#startModule(Module, boolean, AbstractRefreshableApplicationContext)
         */
        public static Module startModule(Module module, boolean isOpenmrsStartup,
                AbstractRefreshableApplicationContext applicationContext) throws ModuleException {
                
                if (!requiredModulesStarted(module)) {
                        int missingModules = 0;
                        
                        for (String packageName : module.getRequiredModulesMap().keySet()) {
                                Module mod = getModuleByPackage(packageName);
                                
                                // mod not installed
                                if (mod == null) {
                                        missingModules++;
                                        continue;
                                }
                                
                                if (!mod.isStarted()) {
                                        startModule(mod);
                                }
                        }
                        
                        if (missingModules > 0) {
                                String message = getFailedToStartModuleMessage(module);
                                log.error(message);
                                module.setStartupErrorMessage(message);
                                notifySuperUsersAboutModuleFailure(module);
                                // instead of return null, i realized that Daemon.startModule() always returns a Module
                                // object,irrespective of whether the startup succeeded
                                return module;
                        }
                }
                return Daemon.startModule(module, isOpenmrsStartup, applicationContext);
        }
        
        /**
         * This method should not be called directly.<br>
         * <br>
         * The {@link #startModule(Module)} (and hence {@link Daemon#startModule(Module)}) calls this method
         * in a new Thread and is authenticated as the {@link Daemon} user<br>
         * <br>
         * Runs through extensionPoints and then calls {@link BaseModuleActivator#willStart()} on the
         * Module's activator.
         *
         * @param module Module to start
         */
        public static Module startModuleInternal(Module module) throws ModuleException {
                return startModuleInternal(module, false, null);
        }
        
        /**
         * This method should not be called directly.<br>
         * <br>
         * The {@link #startModule(Module)} (and hence {@link Daemon#startModule(Module)}) calls this method
         * in a new Thread and is authenticated as the {@link Daemon} user<br>
         * <br>
         * Runs through extensionPoints and then calls {@link BaseModuleActivator#willStart()} on the
         * Module's activator. <br>
         * <br>
         * If a non null application context is passed in, it gets refreshed to make the module's services
         * available
         *
         * @param module Module to start
         * @param isOpenmrsStartup Specifies whether this module is being started at application startup or
         *            not, this argument is ignored if a null application context is passed in
         * @param applicationContext the spring application context instance to refresh
         */
        public static Module startModuleInternal(Module module, boolean isOpenmrsStartup,
                AbstractRefreshableApplicationContext applicationContext) throws ModuleException {
                
                if (module != null) {
                        String moduleId = module.getModuleId();
                        
                        try {
                                
                                // check to be sure this module can run with our current version
                                // of OpenMRS code
                                String requireVersion = module.getRequireOpenmrsVersion();
                                ModuleUtil.checkRequiredVersion(OpenmrsConstants.OPENMRS_VERSION_SHORT, requireVersion);
                                
                                // check for required modules
                                if (!requiredModulesStarted(module)) {
                                        throw new ModuleException(getFailedToStartModuleMessage(module));
                                }
                                
                                // fire up the classloader for this module
                                ModuleClassLoader moduleClassLoader = new ModuleClassLoader(module, ModuleFactory.class.getClassLoader());
                                getModuleClassLoaderMap().put(module, moduleClassLoader);
                                registerProvidedPackages(moduleClassLoader);
                                
                                // don't load the advice objects into the Context
                                // At startup, the spring context isn't refreshed until all modules
                                // have been loaded.  This causes errors if called here during a
                                // module's startup if one of these advice points is on another
                                // module because that other module's service won't have been loaded
                                // into spring yet.  All advice for all modules must be reloaded
                                // a spring context refresh anyway
                                
                                // map extension point to a list of extensions for this module only
                                Map<String, List<Extension>> moduleExtensionMap = new HashMap<>();
                                for (Extension ext : module.getExtensions()) {
                                        
                                        String extId = ext.getExtensionId();
                                        List<Extension> tmpExtensions = moduleExtensionMap.computeIfAbsent(extId, k -> new ArrayList<>());
                                        
                                        tmpExtensions.add(ext);
                                }
                                
                                // Sort this module's extensions, and merge them into the full extensions map
                                Comparator<Extension> sortOrder = (e1, e2) -> Integer.valueOf(e1.getOrder()).compareTo(e2.getOrder());
                                for (Map.Entry<String, List<Extension>> moduleExtensionEntry : moduleExtensionMap.entrySet()) {
                                        // Sort this module's extensions for current extension point
                                        List<Extension> sortedModuleExtensions = moduleExtensionEntry.getValue();
                                        sortedModuleExtensions.sort(sortOrder);
                                        
                                        // Get existing extensions, and append the ones from the new module
                                        List<Extension> extensions = getExtensionMap().computeIfAbsent(moduleExtensionEntry.getKey(),
                                                k -> new ArrayList<>());
                                        for (Extension ext : sortedModuleExtensions) {
                                                log.debug("Adding to mapping ext: " + ext.getExtensionId() + " ext.class: " + ext.getClass());
                                                extensions.add(ext);
                                        }
                                }
                                
                                // run the module's sql update script
                                // This and the property updates are the only things that can't
                                // be undone at startup, so put these calls after any other
                                // calls that might hinder startup
                                SortedMap<String, String> diffs = SqlDiffFileParser.getSqlDiffs(module);
                                
                                try {
                                        // this method must check and run queries against the database.
                                        // to do this, it must be "authenticated".  Give the current
                                        // "user" the proxy privilege so this can be done. ("user" might
                                        // be nobody because this is being run at startup)
                                        Context.addProxyPrivilege("");
                                        
                                        for (Map.Entry<String, String> entry : diffs.entrySet()) {
                                                String version = entry.getKey();
                                                String sql = entry.getValue();
                                                if (StringUtils.hasText(sql)) {
                                                        runDiff(module, version, sql);
                                                }
                                        }
                                }
                                finally {
                                        // take the "authenticated" privilege away from the current "user"
                                        Context.removeProxyPrivilege("");
                                }
                                
                                // run module's optional liquibase.xml immediately after sqldiff.xml
                                runLiquibase(module);
                                
                                // effectively mark this module as started successfully
                                getStartedModulesMap().put(moduleId, module);

                                actualStartupOrder.add(moduleId);
                                
                                try {
                                        // save the state of this module for future restarts
                                        saveGlobalProperty(moduleId + ".started", "true", getGlobalPropertyStartedDescription(moduleId));
                                        
                                        // save the mandatory status
                                        saveGlobalProperty(moduleId + ".mandatory", String.valueOf(module.isMandatory()),
                                                getGlobalPropertyMandatoryModuleDescription(moduleId));
                                }
                                catch (Exception e) {
                                        // pass over errors because this doesn't really concern startup
                                        // passing over this also allows for multiple of the same-named modules
                                        // to be loaded in junit tests that are run within one session
                                        log.debug("Got an error when trying to set the global property on module startup", e);
                                }
                                
                                // (this must be done after putting the module in the started
                                // list)
                                // if this module defined any privileges or global properties,
                                // make sure they are added to the database
                                // (Unfortunately, placing the call here will duplicate work
                                // done at initial app startup)
                                if (!module.getPrivileges().isEmpty() || !module.getGlobalProperties().isEmpty()) {
                                        log.debug("Updating core dataset");
                                        Context.checkCoreDataset();
                                        // checkCoreDataset() currently doesn't throw an error. If
                                        // it did, it needs to be
                                        // caught and the module needs to be stopped and given a
                                        // startup error
                                }
                                
                                // should be near the bottom so the module has all of its stuff
                                // set up for it already.
                                try {
                                        if (module.getModuleActivator() != null) {
                                                // if extends BaseModuleActivator
                                                module.getModuleActivator().willStart();
                                        }
                                }
                                catch (ModuleException e) {
                                        // just rethrow module exceptions. This should be used for a
                                        // module marking that it had trouble starting
                                        throw e;
                                }
                                catch (Exception e) {
                                        throw new ModuleException("Error while calling module's Activator.startup()/willStart() method", e);
                                }
                                
                                // erase any previous startup error
                                module.clearStartupError();
                        }
                        catch (Exception e) {
                                log.warn("Error while trying to start module: " + moduleId, e);
                                module.setStartupErrorMessage("Error while trying to start module", e);
                                notifySuperUsersAboutModuleFailure(module);
                                // undo all of the actions in startup
                                try {
                                        boolean skipOverStartedProperty = false;
                                        
                                        if (e instanceof ModuleMustStartException) {
                                                skipOverStartedProperty = true;
                                        }
                                        
                                        stopModule(module, skipOverStartedProperty, true);
                                }
                                catch (Exception e2) {
                                        // this will probably occur about the same place as the
                                        // error in startup
                                        log.debug("Error while stopping module: " + moduleId, e2);
                                }
                        }
                        
                }
                
                if (applicationContext != null) {
                        ModuleUtil.refreshApplicationContext(applicationContext, isOpenmrsStartup, module);
                }
                
                return module;
        }
        
        private static void registerProvidedPackages(ModuleClassLoader moduleClassLoader) {
                for (String providedPackage : moduleClassLoader.getProvidedPackages()) {
                        Set<ModuleClassLoader> newSet = new HashSet<>();
                        
                        Set<ModuleClassLoader> set = providedPackages.get(providedPackage);
                        if (set != null) {
                                newSet.addAll(set);
                        }
                        
                        newSet.add(moduleClassLoader);
                        providedPackages.put(providedPackage, newSet);
                }
        }
        
        private static void unregisterProvidedPackages(ModuleClassLoader moduleClassLoader) {
                for (String providedPackage : moduleClassLoader.getProvidedPackages()) {
                        Set<ModuleClassLoader> newSet = new HashSet<>();
                        
                        Set<ModuleClassLoader> set = providedPackages.get(providedPackage);
                        if (set != null) {
                                newSet.addAll(set);
                        }
                        newSet.remove(moduleClassLoader);
                        
                        providedPackages.put(providedPackage, newSet);
                }
        }
        
        public static Set<ModuleClassLoader> getModuleClassLoadersForPackage(String packageName) {
                Set<ModuleClassLoader> set = providedPackages.get(packageName);
                if (set == null) {
                        return Collections.emptySet();
                } else {
                        return new HashSet<>(set);
                }
        }
        
        /**
         * Gets the error message of a module which fails to start.
         *
         * @param module the module that has failed to start.
         * @return the message text.
         */
        private static String getFailedToStartModuleMessage(Module module) {
                String[] params = { module.getName(), String.join(",", getMissingRequiredModules(module)) };
                return Context.getMessageSourceService().getMessage("Module.error.moduleCannotBeStarted", params,
                        Context.getLocale());
        }
        
        /**
         * Gets the error message of cyclic dependencies between modules
         *
         * @return the message text.
         */
        private static String getCyclicDependenciesMessage(String message) {
                return Context.getMessageSourceService().getMessage("Module.error.cyclicDependencies", new Object[] { message },
                        Context.getLocale());
        }
        
        /**
         * Loop over the given module's advice objects and load them into the Context This needs to be
         * called for all started modules after every restart of the Spring Application Context
         *
         * @param module
         */
        public static void loadAdvice(Module module) {
                for (AdvicePoint advice : module.getAdvicePoints()) {
                        Class<?> cls;
                        try {
                                cls = Context.loadClass(advice.getPoint());
                                Object aopObject = advice.getClassInstance();
                                if (aopObject instanceof Advisor) {
                                        log.debug("adding advisor [{}]", aopObject.getClass());
                                        Context.addAdvisor(cls, (Advisor) aopObject);
                                } else if (aopObject != null) {
                                        log.debug("adding advice [{}]", aopObject.getClass());
                                        Context.addAdvice(cls, (Advice) aopObject);
                                } else {
                                        log.debug("Could not load advice class for {} [{}]", advice.getPoint(), advice.getClassName());
                                }
                        }
                        catch (ClassNotFoundException | NoClassDefFoundError e) {
                                log.warn("Could not load advice point [{}]", advice.getPoint(), e);
                        }
                }
        }
        
        /**
         * Execute the given sql diff section for the given module
         *
         * @param module the module being executed on
         * @param version the version of this sql diff
         * @param sql the actual sql statements to run (separated by semi colons)
         */
        private static void runDiff(Module module, String version, String sql) {
                AdministrationService as = Context.getAdministrationService();
                
                String key = module.getModuleId() + ".database_version";
                GlobalProperty gp = as.getGlobalPropertyObject(key);
                
                boolean executeSQL = false;
                
                // check given version against current version
                if (gp != null && StringUtils.hasLength(gp.getPropertyValue())) {
                        String currentDbVersion = gp.getPropertyValue();
                        if (log.isDebugEnabled()) {
                                log.debug("version:column {}:{}", version, currentDbVersion);
                                log.debug("compare: {}", ModuleUtil.compareVersion(version, currentDbVersion));
                        }
                        if (ModuleUtil.compareVersion(version, currentDbVersion) > 0) {
                                executeSQL = true;
                        }
                } else {
                        executeSQL = true;
                }
                
                // version is greater than the currently installed version. execute this update.
                if (executeSQL) {
                        try {
                                Context.addProxyPrivilege(PrivilegeConstants.SQL_LEVEL_ACCESS);
                                log.debug("Executing sql: " + sql);
                                String[] sqlStatements = sql.split(";");
                                for (String sqlStatement : sqlStatements) {
                                        if (sqlStatement.trim().length() > 0) {
                                                as.executeSQL(sqlStatement, false);
                                        }
                                }
                        }
                        finally {
                                Context.removeProxyPrivilege(PrivilegeConstants.SQL_LEVEL_ACCESS);
                        }
                        
                        // save the global property
                        try {
                                Context.addProxyPrivilege(PrivilegeConstants.MANAGE_GLOBAL_PROPERTIES);
                                
                                String description = "DO NOT MODIFY.  Current database version number for the " + module.getModuleId()
                                        + " module.";
                                
                                if (gp == null) {
                                        log.info("Global property " + key + " was not found. Creating one now.");
                                        gp = new GlobalProperty(key, version, description);
                                        as.saveGlobalProperty(gp);
                                } else if (!gp.getPropertyValue().equals(version)) {
                                        log.info("Updating global property " + key + " to version: " + version);
                                        gp.setDescription(description);
                                        gp.setPropertyValue(version);
                                        as.saveGlobalProperty(gp);
                                } else {
                                        log.error("Should not be here. GP property value and sqldiff version should not be equal");
                                }
                                
                        }
                        finally {
                                Context.removeProxyPrivilege(PrivilegeConstants.MANAGE_GLOBAL_PROPERTIES);
                        }
                        
                }
                
        }
        
        /**
         * Execute all not run changeSets in liquibase.xml for the given module
         *
         * @param module the module being executed on
         */
        private static void runLiquibase(Module module) {
                ModuleClassLoader moduleClassLoader = getModuleClassLoader(module);
                boolean liquibaseFileExists = false;
                
                if (moduleClassLoader != null) {
                        try (InputStream inStream = moduleClassLoader.getResourceAsStream(MODULE_CHANGELOG_FILENAME)) {
                                liquibaseFileExists = (inStream != null);
                        }
                        catch (IOException ignored) {
                                
                        }
                }
                
                if (liquibaseFileExists) {
                        try {
                                // run liquibase.xml by Liquibase API
                                DatabaseUpdater.executeChangelog(MODULE_CHANGELOG_FILENAME, new Contexts(), null, moduleClassLoader);
                        }
                        catch (InputRequiredException e) {
                                // the user would be stepped through the questions returned here.
                                throw new ModuleException("Input during database updates is not yet implemented.", module.getName(), e);
                        }
                        catch (Exception e) {
                                throw new ModuleException("Unable to update data model using " + MODULE_CHANGELOG_FILENAME + ".",
                                        module.getName(), e);
                        }
                }
        }
        
        /**
         * Runs through the advice and extension points and removes from api. <br>
         * Also calls mod.Activator.shutdown()
         *
         * @param mod module to stop
         * @see ModuleFactory#stopModule(Module, boolean, boolean)
         */
        public static void stopModule(Module mod) {
                stopModule(mod, false, false);
        }
        
        /**
         * Runs through the advice and extension points and removes from api.<br>
         * Also calls mod.Activator.shutdown()
         *
         * @param mod the module to stop
         * @param isShuttingDown true if this is called during the process of shutting down openmrs
         * @see #stopModule(Module, boolean, boolean)
         */
        public static void stopModule(Module mod, boolean isShuttingDown) {
                stopModule(mod, isShuttingDown, false);
        }
        
        /**
         * Runs through the advice and extension points and removes from api.<br>
         * <code>skipOverStartedProperty</code> should only be true when openmrs is stopping modules because
         * it is shutting down. When normally stopping a module, use {@link #stopModule(Module)} (or leave
         * value as false). This property controls whether the globalproperty is set for startup/shutdown.
         * <br>
         * Also calls module's {@link ModuleActivator#stopped()}
         *
         * @param mod module to stop
         * @param skipOverStartedProperty true if we don't want to set &lt;moduleid&gt;.started to false
         * @param isFailedStartup true if this is being called as a cleanup because of a failed module
         *            startup
         * @return list of dependent modules that were stopped because this module was stopped. This will
         *         never be null.
         */
        public static List<Module> stopModule(Module mod, boolean skipOverStartedProperty, boolean isFailedStartup)
                throws ModuleMustStartException {
                
                List<Module> dependentModulesStopped = new ArrayList<>();
                
                if (mod != null) {
                        
                        if (!ModuleFactory.isModuleStarted(mod)) {
                                return dependentModulesStopped;
                        }
                        
                        try {
                                // if extends BaseModuleActivator
                                if (mod.getModuleActivator() != null) {
                                        mod.getModuleActivator().willStop();
                                }
                        }
                        catch (Exception t) {
                                log.warn("Unable to call module's Activator.willStop() method", t);
                        }
                        
                        String moduleId = mod.getModuleId();
                        
                        // don't allow mandatory modules to be stopped
                        // don't use database checks here because spring might be in a bad state
                        if (!isFailedStartup && mod.isMandatory()) {
                                throw new MandatoryModuleException(moduleId);
                        }

                        String modulePackage = mod.getPackageName();
                        
                        // stop all dependent modules
                        // copy modules to new list to avoid "concurrent modification exception"
                        List<Module> startedModulesCopy = new ArrayList<>(getStartedModules());
                        for (Module dependentModule : startedModulesCopy) {
                                if (dependentModule != null && !dependentModule.equals(mod)
                                        && isModuleRequiredByAnother(dependentModule, modulePackage)) {
                                        dependentModulesStopped.add(dependentModule);
                                        dependentModulesStopped.addAll(stopModule(dependentModule, skipOverStartedProperty, isFailedStartup));
                                }
                        }
                        
                        getStartedModulesMap().remove(moduleId);
                        if (actualStartupOrder != null) {
                                actualStartupOrder.remove(moduleId);
                                for (Module depModule : dependentModulesStopped) {
                                        actualStartupOrder.remove(depModule.getModuleId());
                                }
                        }
                        
                        if (!skipOverStartedProperty && !Context.isRefreshingContext()) {
                                saveGlobalProperty(moduleId + ".started", "false", getGlobalPropertyStartedDescription(moduleId));
                        }
                        
                        ModuleClassLoader moduleClassLoader = getModuleClassLoaderMap().get(mod);
                        if (moduleClassLoader != null) {
                                unregisterProvidedPackages(moduleClassLoader);
                                
                                log.debug("Mod was in classloader map.  Removing advice and extensions.");
                                // remove all advice by this module
                                try {
                                        for (AdvicePoint advice : mod.getAdvicePoints()) {
                                                Class cls;
                                                try {
                                                        cls = Context.loadClass(advice.getPoint());
                                                        Object aopObject = advice.getClassInstance();
                                                        if (aopObject instanceof Advisor) {
                                                                log.debug("adding advisor: " + aopObject.getClass());
                                                                Context.removeAdvisor(cls, (Advisor) aopObject);
                                                        } else {
                                                                log.debug("Adding advice: " + aopObject.getClass());
                                                                Context.removeAdvice(cls, (Advice) aopObject);
                                                        }
                                                }
                                                catch (Exception t) {
                                                        log.warn("Could not remove advice point: " + advice.getPoint(), t);
                                                }
                                        }
                                }
                                catch (Exception t) {
                                        log.warn("Error while getting advicePoints from module: " + moduleId, t);
                                }
                                
                                // remove all extensions by this module
                                try {
                                        for (Extension ext : mod.getExtensions()) {
                                                String extId = ext.getExtensionId();
                                                try {
                                                        List<Extension> tmpExtensions = getExtensions(extId);
                                                        tmpExtensions.remove(ext);
                                                        getExtensionMap().put(extId, tmpExtensions);
                                                }
                                                catch (Exception exterror) {
                                                        log.warn("Error while getting extension: " + ext, exterror);
                                                }
                                        }
                                }
                                catch (Exception t) {
                                        log.warn("Error while getting extensions from module: " + moduleId, t);
                                }
                        }
                        
                        //Run the onShutdown() method for openmrs services in this module.
                        List<OpenmrsService> services = Context.getModuleOpenmrsServices(modulePackage);
                        if (services != null) {
                                for (OpenmrsService service : services) {
                                        service.onShutdown();
                                }
                        }
                        
                        try {
                                if (mod.getModuleActivator() != null) {// extends BaseModuleActivator
                                        mod.getModuleActivator().stopped();
                                }
                        }
                        catch (Exception t) {
                                log.warn("Unable to call module's Activator.shutdown() method", t);
                        }
                        
                        //Since extensions are loaded by the module class loader which is about to be disposed,
                        //we need to clear them, else we shall never be able to unload the class loader until
                        //when we unload the module, hence resulting into two problems:
                        // 1) Memory leakage for start/stop module.
                        // 2) Calls to Context.getService(Service.class) which are made within these extensions 
                        //          will throw APIException("Service not found: ") because their calls to Service.class
                        //    will pass in a Class from the old module class loader (which loaded them) yet the
                        //    ServiceContext will have new services from a new module class loader.
                        //
                        //Same thing applies to activator, moduleActivator and AdvicePoint classInstance.
                        mod.getExtensions().clear();
                        mod.setModuleActivator(null);
                        mod.disposeAdvicePointsClassInstance();
                        
                        ModuleClassLoader cl = removeClassLoader(mod);
                        if (cl != null) {
                                cl.dispose();
                                // remove files from lib cache
                                File folder = OpenmrsClassLoader.getLibCacheFolder();
                                File tmpModuleDir = new File(folder, moduleId);
                                try {
                                        OpenmrsUtil.deleteDirectory(tmpModuleDir);
                                }
                                catch (IOException e) {
                                        log.warn("Unable to delete libcachefolder for " + moduleId);
                                }
                        }
                }
                
                return dependentModulesStopped;
        }
        
        /**
         * Checks if a module is required by another
         *
         * @param dependentModule the module whose required modules are to be checked
         * @param modulePackage the package of the module to check if required by another
         * @return true if the module is required, else false
         */
        private static boolean isModuleRequiredByAnother(Module dependentModule, String modulePackage) {
                return dependentModule.getRequiredModules() != null && dependentModule.getRequiredModules().contains(modulePackage);
        }
        
        private static ModuleClassLoader removeClassLoader(Module mod) {
                // create map if it is null
                ModuleClassLoader cl = moduleClassLoaders.getIfPresent(mod);
                if (cl == null) {
                        log.warn("Module: " + mod.getModuleId() + " does not exist");
                }
                
                moduleClassLoaders.invalidate(mod);
                
                return cl;
        }
        
        /**
         * Removes module from module repository
         *
         * @param mod module to unload
         */
        public static void unloadModule(Module mod) {
                
                // remove this module's advice and extensions
                if (isModuleStarted(mod)) {
                        stopModule(mod, true);
                }
                
                // remove from list of loaded modules
                getLoadedModules().remove(mod);
                
                if (mod != null) {
                        // remove the file from the module repository
                        File file = mod.getFile();
                        
                        boolean deleted = file.delete();
                        if (!deleted) {
                                file.deleteOnExit();
                                log.warn("Could not delete " + file.getAbsolutePath());
                        }
                        
                }
        }
        
        /**
         * Return all of the extensions associated with the given <code>pointId</code> Returns empty
         * extension list if no modules extend this pointId
         *
         * @param pointId
         * @return List of extensions
         */
        public static List<Extension> getExtensions(String pointId) {
                List<Extension> extensions;
                Map<String, List<Extension>> extensionMap = getExtensionMap();
                
                // get all extensions for this exact pointId
                extensions = extensionMap.get(pointId);
                if (extensions == null) {
                        extensions = new ArrayList<>();
                }
                
                // if this pointId doesn't contain the separator character, search
                // for this point prepended with each MEDIA TYPE
                if (!pointId.contains(Extension.EXTENSION_ID_SEPARATOR)) {
                        for (MEDIA_TYPE mediaType : Extension.MEDIA_TYPE.values()) {
                                
                                // get all extensions for this type and point id
                                List<Extension> tmpExtensions = extensionMap.get(Extension.toExtensionId(pointId, mediaType));
                                
                                // 'extensions' should be a unique list
                                if (tmpExtensions != null) {
                                        for (Extension ext : tmpExtensions) {
                                                if (!extensions.contains(ext)) {
                                                        extensions.add(ext);
                                                }
                                        }
                                }
                        }
                }
                
                log.debug("Getting extensions defined by : " + pointId);
                return extensions;
        }
        
        /**
         * Return all of the extensions associated with the given <code>pointId</code> Returns
         * getExtension(pointId) if no modules extend this pointId for given media type
         *
         * @param pointId
         * @param type Extension.MEDIA_TYPE
         * @return List of extensions
         */
        public static List<Extension> getExtensions(String pointId, Extension.MEDIA_TYPE type) {
                String key = Extension.toExtensionId(pointId, type);
                List<Extension> extensions = getExtensionMap().get(key);
                if (extensions != null) {
                        log.debug("Getting extensions defined by : " + key);
                        return extensions;
                } else {
                        return getExtensions(pointId);
                }
        }
        
        /**
         * Get a list of required Privileges defined by the modules
         *
         * @return <code>List&lt;Privilege&gt;</code> of the required privileges
         */
        public static List<Privilege> getPrivileges() {
                
                List<Privilege> privileges = new ArrayList<>();
                
                for (Module mod : getStartedModules()) {
                        privileges.addAll(mod.getPrivileges());
                }
                
                log.debug(privileges.size() + " new privileges");
                
                return privileges;
        }
        
        /**
         * Get a list of required GlobalProperties defined by the modules
         *
         * @return <code>List&lt;GlobalProperty&gt;</code> object of the module's global properties
         */
        public static List<GlobalProperty> getGlobalProperties() {
                
                List<GlobalProperty> globalProperties = new ArrayList<>();
                
                for (Module mod : getStartedModules()) {
                        globalProperties.addAll(mod.getGlobalProperties());
                }
                
                log.debug(globalProperties.size() + " new global properties");
                
                return globalProperties;
        }
        
        /**
         * Checks whether the given module is activated
         *
         * @param mod Module to check
         * @return true if the module is started, false otherwise
         */
        public static boolean isModuleStarted(Module mod) {
                return getStartedModulesMap().containsValue(mod);
        }
        
        /**
         * Checks whether the given module, identified by its id, is started.
         *
         * @param moduleId module id. e.g formentry, logic
         * @since 1.9
         * @return true if the module is started, false otherwise
         */
        public static boolean isModuleStarted(String moduleId) {
                return getStartedModulesMap().containsKey(moduleId);
        }
        
        /**
         * Get a module's classloader
         *
         * @param mod Module to fetch the class loader for
         * @return ModuleClassLoader pertaining to this module. Returns null if the module is not started
         * @throws ModuleException if the module does not have a registered classloader
         */
        public static ModuleClassLoader getModuleClassLoader(Module mod) throws ModuleException {
                ModuleClassLoader mcl = getModuleClassLoaderMap().get(mod);
                
                if (mcl == null) {
                        log.debug("Module classloader not found for module with id: " + mod.getModuleId());
                }
                
                return mcl;
        }
        
        /**
         * Get a module's classloader via the module id
         *
         * @param moduleId <code>String</code> id of the module
         * @return ModuleClassLoader pertaining to this module. Returns null if the module is not started
         * @throws ModuleException if this module isn't started or doesn't have a classloader
         * @see #getModuleClassLoader(Module)
         */
        public static ModuleClassLoader getModuleClassLoader(String moduleId) throws ModuleException {
                Module mod = getStartedModulesMap().get(moduleId);
                if (mod == null) {
                        log.debug("Module id not found in list of started modules: " + moduleId);
                }
                
                return getModuleClassLoader(mod);
        }
        
        /**
         * Returns all module classloaders This method will not return null
         *
         * @return Collection&lt;ModuleClassLoader&gt; all known module classloaders or empty list.
         */
        public static Collection<ModuleClassLoader> getModuleClassLoaders() {
                Map<Module, ModuleClassLoader> classLoaders = getModuleClassLoaderMap();
                if (classLoaders.size() > 0) {
                        return classLoaders.values();
                }
                
                return Collections.emptyList();
        }
        
        /**
         * Return all current classloaders keyed on module object
         *
         * @return Map&lt;Module, ModuleClassLoader&gt;
         */
        public static Map<Module, ModuleClassLoader> getModuleClassLoaderMap() {
                // because the OpenMRS classloader depends on this static function, it is weirdly possible for this to get called
                // as this classfile is loaded, in which case, the static final field can be null.
                if (moduleClassLoaders == null) {
                        return Collections.emptyMap();
                }
                
                return moduleClassLoaders.asMap();
        }
        
        /**
         * Return the current extension map keyed on extension point id
         *
         * @return Map&lt;String, List&lt;Extension&gt;&gt;
         */
        public static Map<String, List<Extension>> getExtensionMap() {
                return extensionMap;
        }
        
        /**
         * Tests whether all modules mentioned in module.requiredModules are loaded and started already (by
         * being in the startedModules list)
         *
         * @param module
         * @return true/false boolean whether this module's required modules are all started
         */
        private static boolean requiredModulesStarted(Module module) {
                //required
                for (String reqModPackage : module.getRequiredModules()) {
                        boolean started = false;
                        for (Module mod : getStartedModules()) {
                                if (mod.getPackageName().equals(reqModPackage)) {
                                        String reqVersion = module.getRequiredModuleVersion(reqModPackage);
                                        if (reqVersion == null || ModuleUtil.compareVersion(mod.getVersion(), reqVersion) >= 0) {
                                                started = true;
                                        }
                                        break;
                                }
                        }
                        
                        if (!started) {
                                return false;
                        }
                }
                
                return true;
        }
        
        /**
         * Update the module: 1) Download the new module 2) Unload the old module 3) Load/start the new
         * module
         *
         * @param mod
         */
        public static Module updateModule(Module mod) throws ModuleException {
                if (mod.getDownloadURL() == null) {
                        return mod;
                }
                
                URL url;
                try {
                        url = new URL(mod.getDownloadURL());
                }
                catch (MalformedURLException e) {
                        throw new ModuleException("Unable to download module update", e);
                }
                
                unloadModule(mod);
                
                // copy content to a temporary file
                InputStream inputStream = ModuleUtil.getURLStream(url);
                log.warn("url pathname: " + url.getPath());
                String filename = url.getPath().substring(url.getPath().lastIndexOf("/"));
                File moduleFile = ModuleUtil.insertModuleFile(inputStream, filename);
                
                try {
                        // load, and start the new module
                        Module newModule = loadModule(moduleFile);
                        startModule(newModule);
                        return newModule;
                }
                catch (Exception e) {
                        log.warn("Error while unloading old module and loading in new module");
                        moduleFile.delete();
                        return mod;
                }
                
        }
        
        /**
         * Validates the given token.
         * <p>
         * It is thread safe.
         *
         * @param token
         * @since 1.9.2
         */
        public static boolean isTokenValid(DaemonToken token) {
                if (token == null) {
                        return false;
                } else {
                        //We need to synchronize to guarantee that the last passed token is valid.
                        synchronized (daemonTokens) {
                                DaemonToken validToken = daemonTokens.getIfPresent(token.getId());
                                //Compare by reference to defend from overridden equals.
                                return validToken != null && validToken == token;
                        }
                }
        }
        
        /**
         * Passes a daemon token to the given module.
         * <p>
         * The token is passed to that module's {@link ModuleActivator} if it implements
         * {@link DaemonTokenAware}.
         * <p>
         * This method is called automatically before {@link ModuleActivator#contextRefreshed()} or
         * {@link ModuleActivator#started()}. Note that it may be called multiple times and there is no
         * guarantee that it will always pass the same token. The last passed token is valid, whereas
         * previously passed tokens may be invalidated.
         * <p>
         * It is thread safe.
         *
         * @param module
         * @since 1.9.2
         */
        static void passDaemonToken(Module module) {
                ModuleActivator moduleActivator = module.getModuleActivator();
                if (moduleActivator instanceof DaemonTokenAware) {
                        DaemonToken daemonToken = getDaemonToken(module);
                        ((DaemonTokenAware) module.getModuleActivator()).setDaemonToken(daemonToken);
                }
        }
        
        /**
         * Gets a new or existing token. Uses weak references for tokens so that they are garbage collected
         * when not needed.
         * <p>
         * It is thread safe.
         *
         * @param module
         * @return the token
         */
        private static DaemonToken getDaemonToken(Module module) {
                DaemonToken token;
                try {
                        token = daemonTokens.get(module.getModuleId(), () -> new DaemonToken(module.getModuleId()));
                }
                catch (ExecutionException e) {
                        throw new APIException(e);
                }
                
                return token;
        }
        
        /**
         * Returns the description for the [moduleId].started global property
         *
         * @param moduleId
         * @return description to use for the .started property
         */
        private static String getGlobalPropertyStartedDescription(String moduleId) {
                String ret = "DO NOT MODIFY. true/false whether or not the " + moduleId;
                ret += " module has been started.  This is used to make sure modules that were running ";
                ret += " prior to a restart are started again";
                
                return ret;
        }
        
        /**
         * Returns the description for the [moduleId].mandatory global property
         *
         * @param moduleId
         * @return description to use for .mandatory property
         */
        private static String getGlobalPropertyMandatoryModuleDescription(String moduleId) {
                String ret = "true/false whether or not the " + moduleId;
                ret += " module MUST start when openmrs starts.  This is used to make sure that mission critical";
                ret += " modules are always running if openmrs is running.";
                
                return ret;
        }
        
        /**
         * Convenience method to save a global property with the given value. Proxy privileges are added so
         * that this can occur at startup.
         *
         * @param key the property for this global property
         * @param value the value for this global property
         * @param desc the description
         * @see AdministrationService#saveGlobalProperty(GlobalProperty)
         */
        private static void saveGlobalProperty(String key, String value, String desc) {
                try {
                        AdministrationService as = Context.getAdministrationService();
                        GlobalProperty gp = as.getGlobalPropertyObject(key);
                        if (gp == null) {
                                gp = new GlobalProperty(key, value, desc);
                        } else {
                                gp.setPropertyValue(value);
                        }
                        
                        as.saveGlobalProperty(gp);
                }
                catch (Exception e) {
                        log.warn("Unable to save the global property", e);
                }
        }
        
        /**
         * Convenience method used to identify module interdependencies and alert the user before modules
         * are shut down.
         *
         * @param moduleId the moduleId used to identify the module being validated
         * @return List&lt;dependentModules&gt; the list of moduleId's which depend on the module about to
         *         be shutdown.
         * @since 1.10
         */
        public static List<String> getDependencies(String moduleId) {
                List<String> dependentModules = null;
                Module module = getModuleById(moduleId);
                
                Map<String, Module> startedModules = getStartedModulesMap();
                String modulePackage = module.getPackageName();
                
                for (Entry<String, Module> entry : startedModules.entrySet()) {
                        if (!moduleId.equals(entry.getKey()) && entry.getValue().getRequiredModules().contains(modulePackage)) {
                                if (dependentModules == null) {
                                        dependentModules = new ArrayList<>();
                                }
                                dependentModules.add(entry.getKey() + " " + entry.getValue().getVersion());
                        }
                }
                return dependentModules;
        }
}

openmrs / openmrs-core / 16357938490

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