6310285782

Committed 26 Sep 2023 08:47AM UTC coverage: 36.367% (-0.5%) from 36.866%

Build # 6310285782

Build Type

Pull #658

github

Committed by

dkfellows

Commit Message

Merge branch 'master' into java-17

Pull Request Pull Request #658: Update Java version to 17 and JEE to 9

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62.47

/SpiNNaker-allocserv/src/main/java/uk/ac/manchester/spinnaker/alloc/bmp/BMPController.java

/*
 * Copyright (c) 2021 The University of Manchester
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package uk.ac.manchester.spinnaker.alloc.bmp;

import static java.lang.String.format;
import static java.lang.Thread.currentThread;
import static java.lang.Thread.sleep;
import static java.time.Instant.now;
import static java.util.Objects.requireNonNull;
import static org.slf4j.LoggerFactory.getLogger;
import static uk.ac.manchester.spinnaker.alloc.bmp.NonBootOperation.GET_SERIAL;
import static uk.ac.manchester.spinnaker.alloc.bmp.NonBootOperation.READ_BL;
import static uk.ac.manchester.spinnaker.alloc.bmp.NonBootOperation.READ_TEMP;
import static uk.ac.manchester.spinnaker.alloc.bmp.NonBootOperation.WRITE_BL;
import static uk.ac.manchester.spinnaker.alloc.model.JobState.DESTROYED;
import static uk.ac.manchester.spinnaker.alloc.model.JobState.QUEUED;
import static uk.ac.manchester.spinnaker.alloc.model.JobState.READY;

import java.io.IOException;
import java.lang.Thread.UncaughtExceptionHandler;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.function.Consumer;
import java.util.stream.Collectors;

import org.slf4j.Logger;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jmx.export.annotation.ManagedResource;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.stereotype.Service;

import com.google.errorprone.annotations.RestrictedApi;
import com.google.errorprone.annotations.concurrent.GuardedBy;

import jakarta.annotation.PostConstruct;
import uk.ac.manchester.spinnaker.alloc.ForTestingOnly;
import uk.ac.manchester.spinnaker.alloc.ServiceMasterControl;
import uk.ac.manchester.spinnaker.alloc.SpallocProperties.AllocatorProperties;
import uk.ac.manchester.spinnaker.alloc.SpallocProperties.TxrxProperties;
import uk.ac.manchester.spinnaker.alloc.admin.ReportMailSender;
import uk.ac.manchester.spinnaker.alloc.allocator.AllocatorTask;
import uk.ac.manchester.spinnaker.alloc.allocator.Epochs;
import uk.ac.manchester.spinnaker.alloc.allocator.SpallocAPI;
import uk.ac.manchester.spinnaker.alloc.db.DatabaseAPI.Connection;
import uk.ac.manchester.spinnaker.alloc.db.DatabaseAwareBean;
import uk.ac.manchester.spinnaker.alloc.db.Row;
import uk.ac.manchester.spinnaker.alloc.model.Direction;
import uk.ac.manchester.spinnaker.alloc.model.JobState;
import uk.ac.manchester.spinnaker.machine.board.BMPBoard;
import uk.ac.manchester.spinnaker.machine.board.BMPCoords;
import uk.ac.manchester.spinnaker.machine.board.HasBMPLocation;
import uk.ac.manchester.spinnaker.messages.model.ADCInfo;
import uk.ac.manchester.spinnaker.messages.model.Blacklist;
import uk.ac.manchester.spinnaker.transceiver.ProcessException;
import uk.ac.manchester.spinnaker.transceiver.ProcessException.CallerProcessException;
import uk.ac.manchester.spinnaker.transceiver.ProcessException.PermanentProcessException;
import uk.ac.manchester.spinnaker.transceiver.ProcessException.TransientProcessException;
import uk.ac.manchester.spinnaker.transceiver.SpinnmanException;
import uk.ac.manchester.spinnaker.utils.UsedInJavadocOnly;

/**
 * Manages the BMPs of machines controlled by Spalloc.
 *
 * @author Donal Fellows
 */
@Service("bmpController")
@ManagedResource("Spalloc:type=BMPController,name=bmpController")
public class BMPController extends DatabaseAwareBean {
        private static final Logger log = getLogger(BMPController.class);

        @Autowired
        private SpallocAPI spallocCore;

        @Autowired
        private ServiceMasterControl serviceControl;

        @Autowired
        private Epochs epochs;

        @Autowired
        private TxrxProperties props;

        @Autowired
        private PhysicalSerialMapping phySerMap;

        @Autowired
        private AllocatorProperties allocProps;

        @Autowired
        private ReportMailSender emailSender;

        @Autowired
        private AllocatorTask allocator;

        private TaskScheduler scheduler;

        /**
         * Map from BMP ID to worker task that handles it.
         */
        private final Map<Integer, Worker> workers = new HashMap<>();

        /**
         * Factory for {@linkplain SpiNNakerControl controllers}. Only use via
         * {@link #controllerFactory}.
         */
        @Autowired
        private ObjectProvider<SpiNNakerControl> controllerFactoryBean;

        /**
         * Type-safe factory for {@linkplain SpiNNakerControl controllers}.
         */
        private SpiNNakerControl.Factory controllerFactory;

        @GuardedBy("this")
        private Throwable bmpProcessingException;

        /**
         * An {@link UncaughtExceptionHandler}.
         *
         * @param thread
         *            The thread with the problem.
         * @param exception
         *            The exception that describes the problem.
         */
        @UsedInJavadocOnly(UncaughtExceptionHandler.class)
        private void handleException(Thread thread, Throwable exception) {
                log.error("uncaught exception in BMP worker {}", thread, exception);
        }

        // ----------------------------------------------------------------

        @PostConstruct
        private void init() {
                // Set up scheduler
                var sched = new ThreadPoolTaskScheduler();
                scheduler = sched;
                sched.setThreadGroupName("BMP");

                controllerFactory = controllerFactoryBean::getObject;
                allocator.setBMPController(this);

                // We do the making of workers later in tests
                List<Worker> madeWorkers = null;
                if (!serviceControl.isUseDummyBMP()) {
                        madeWorkers = makeWorkers();
                }

                // Set the pool size to match the number of workers
                if (workers.size() > 1) {
                        sched.setPoolSize(workers.size());
                }

                // Launch the scheduler now it is all set up
                sched.initialize();

                // And now use the scheduler
                if (madeWorkers != null) {
                        for (var worker : madeWorkers) {
                                scheduler.scheduleAtFixedRate(worker, allocProps.getPeriod());
                        }
                }
        }

        private List<Worker> makeWorkers() {
                // Make workers
                try (var c = getConnection();
                                var getBmps = c.query(GET_ALL_BMPS);
                                var getBoards = c.query(GET_ALL_BMP_BOARDS)) {
                        return c.transaction(false, () -> getBmps.call(row -> {
                                var m = spallocCore.getMachine(row.getString("machine_name"),
                                                true);
                                var coords = new BMPCoords(row.getInt("cabinet"),
                                                row.getInt("frame"));
                                var boards = new HashMap<BMPBoard, String>();
                                var bmpId = row.getInt("bmp_id");
                                getBoards.call(r -> {
                                        boards.put(new BMPBoard(r.getInt("board_num")),
                                                        r.getString("address"));
                                        return null;
                                }, bmpId);
                                var control = controllerFactory.create(m.get(), coords, boards);
                                var worker = new Worker(control, bmpId);
                                workers.put(row.getInt("bmp_id"), worker);
                                return worker;
                        }));
                }
        }

        /**
         * Trigger the execution of the workers for the given BMPs now.
         *
         * @param bmps
         *            A list of BMPs that have changed.
         */
        public void triggerSearch(Collection<Integer> bmps) {
                for (var b : bmps) {
                        var worker = workers.get(b);
                        if (worker != null) {
                                scheduler.schedule(worker::run, now());
                        } else {
                                log.error("Could not find worker for BMP {}", b);
                        }
                }
        }

        /** An action that may throw any of a range of exceptions. */
        private interface ThrowingAction {
                void act() throws ProcessException, IOException, InterruptedException;
        }

        private abstract sealed class Request
                        permits BoardRequest, PowerRequest {
                final int bmpId;

                private int numTries = 0;

                Request(int bmpId) {
                        this.bmpId = bmpId;
                }

                /**
                 * @return Whether this request may be repeated.
                 */
                boolean isRepeat() {
                        return numTries < props.getPowerAttempts();
                }

                /**
                 * Basic machinery for handling exceptions that arise while performing a
                 * BMP action. Runs on a thread that may touch a BMP directly, but which
                 * may not touch the database.
                 * <p>
                 * Only subclasses should use this!
                 *
                 * @param body
                 *            What to attempt.
                 * @param onFailure
                 *            What to do on failure.
                 * @param onServiceRemove
                 *            If the exception looks serious, call this to trigger a
                 *            board being taken out of service.
                 * @return Whether to stop the retry loop.
                 * @throws InterruptedException
                 *             If interrupted.
                 */
                final boolean bmpAction(ThrowingAction body,
                                Consumer<Exception> onFailure,
                                Consumer<PermanentProcessException> onServiceRemove)
                                throws InterruptedException {
                        boolean isLastTry = numTries++ >= props.getPowerAttempts();
                        Exception exn;
                        try {
                                body.act();
                                // Exit the retry loop (up the stack); the requests all worked
                                return true;
                        } catch (InterruptedException e) {
                                /*
                                 * We were interrupted! This happens when we're shutting down.
                                 * Log (because we're in an inconsistent state) and rethrow so
                                 * that the outside gets to clean up.
                                 */
                                log.error("Requests failed on BMP {} because of "
                                                + "interruption", bmpId, e);
                                currentThread().interrupt();
                                throw e;
                        } catch (TransientProcessException e) {
                                if (!isLastTry) {
                                        // Log somewhat gently; we *might* be able to recover...
                                        log.warn("Retrying requests on BMP {} after {}: {}",
                                                        bmpId, props.getProbeInterval(),
                                                        e.getMessage());
                                        // Ask for a retry
                                        return false;
                                }
                                exn = e;
                                log.error("Requests failed on BMP {}", bmpId, e);
                        } catch (PermanentProcessException e) {
                                log.error("BMP {} on {} is unreachable", e.source, bmpId, e);
                                onServiceRemove.accept(e);
                                exn = e;
                        } catch (CallerProcessException e) {
                                // This is probably a software bug
                                log.error("SW bug talking to BMP {}", bmpId, e);
                                exn = e;
                        } catch (ProcessException | IOException | RuntimeException e) {
                                log.error("Requests failed on BMP {}", bmpId, e);
                                exn = e;
                        }
                        /*
                         * Common permanent failure handling case; arrange for taking a
                         * board out of service, mark a request as failed, and stop the
                         * retry loop.
                         */
                        onFailure.accept(exn);
                        return true;
                }

                /**
                 * Add a report to the database of a problem with a board.
                 *
                 * @param sql
                 *            How to talk to the DB
                 * @param boardId
                 *            Which board has the problem
                 * @param jobId
                 *            What job was associated with the problem (if any)
                 * @param msg
                 *            Information about what the problem was
                 */
                final void addBoardReport(Connection c, int boardId, Integer jobId,
                                String msg) {
                        try (var getUser = c.query(GET_USER_DETAILS_BY_NAME);
                                        var insertBoardReport = c.update(INSERT_BOARD_REPORT)) {
                                getUser.call1(row -> row.getInt("user_id"),
                                                allocProps.getSystemReportUser()).ifPresent(
                                                                userId -> insertBoardReport.call(
                                                                                boardId, jobId,        msg, userId));
                        }
                }

                /**
                 * Marks a board as actually dead, and requests we send email about it.
                 *
                 * @param sql
                 *            How to talk to the DB
                 * @param boardId
                 *            Which board has the problem
                 * @param msg
                 *            Information about what the problem was
                 * @return Whether we've successfully done a change.
                 */
                final void markBoardAsDead(Connection c, int boardId, String msg) {
                        try (var setFunctioning = c.update(SET_FUNCTIONING_FIELD);
                                        var findBoardById = c.query(FIND_BOARD_BY_ID)) {
                                boolean result = setFunctioning.call(false, boardId) > 0;
                                if (result) {
                                        findBoardById.call1(row -> {
                                                var ser = row.getString("physical_serial_id");
                                                if (ser == null) {
                                                        ser = "<UNKNOWN>";
                                                }
                                                var fullMessage = format(
                                                                "Marked board at %d,%d,%d of %s (serial: %s) "
                                                                                + "as dead: %s",
                                                                row.getInt("x"), row.getInt("y"),
                                                                row.getInt("z"), row.getString("machine_name"),
                                                                ser, msg);
                                                emailSender.sendServiceMail(fullMessage);
                                                return null;
                                        }, boardId);
                                }
                        }
                }

                boolean processRequest(SpiNNakerControl control) {
                        while (isRepeat()) {
                                try {
                                        if (tryProcessRequest(control)) {
                                                return true;
                                        }
                                        sleep(props.getProbeInterval().toMillis());
                                } catch (InterruptedException e) {
                                        // If this happens, just cancel the transaction;
                                        // when we come back, all things will be redone.
                                        throw new RuntimeException(e);
                                }
                        }
                        return false;
                }

                abstract boolean tryProcessRequest(SpiNNakerControl control)
                                throws InterruptedException;
        }

        /**
         * Describes a request to modify the power status of a collection of boards.
         * The boards must be on a single machine and must all be assigned to a
         * single job.
         * <p>
         * This is the message that is sent from the main thread to the per-BMP
         * worker threads.
         *
         * @author Donal Fellows
         */
        private final class PowerRequest extends Request {
                private final List<BMPBoard> powerOnBoards = new ArrayList<>();

                private final List<BMPBoard> powerOffBoards = new ArrayList<>();

                private final List<Link> linkRequests = new ArrayList<>();

                private final int jobId;

                private final JobState from;

                private final JobState to;

                private final List<Integer> changeIds = new ArrayList<>();

                private final Map<Integer, Integer> boardToId = new HashMap<>();

                /**
                 * Create a request.
                 *
                 * @param sql
                 *            How to access the database.
                 * @param machine
                 *            What machine are the boards on? <em>Must not</em> be
                 *            {@code null}.
                 * @param powerOn
                 *            What boards (by DB ID) are to be powered on? May be
                 *            {@code null}; that's equivalent to the empty list.
                 * @param powerOff
                 *            What boards (by DB ID) are to be powered off? May be
                 *            {@code null}; that's equivalent to the empty list.
                 * @param links
                 *            Any link power control requests. By default, links are on
                 *            if their board is on and they are connected; it is
                 *            <em>useful and relevant</em> to modify the power state of
                 *            links on the periphery of an allocation. May be
                 *            {@code null}; that's equivalent to the empty list.
                 * @param jobId
                 *            For what job is this?
                 * @param from
                 *            What state is the job moving from?
                 * @param to
                 *            What state is the job moving to?
                 * @param changeIds
                 *            The DB ids that describe the change, so we can update
                 *            those records.
                 * @param idToBoard
                 *            How to get the physical ID of a board from its database ID
                 */
                PowerRequest(int bmpId, int jobId, JobState from, JobState to,
                                List<PowerChange> powerChanges) {
                        super(bmpId);
                        for (var change : powerChanges) {
                                if (change.power()) {
                                        powerOnBoards.add(new BMPBoard(change.boardNum()));
                                } else {
                                        powerOffBoards.add(new BMPBoard(change.boardNum()));
                                }
                                change.offLinks().stream().forEach(link ->
                                                linkRequests.add(new Link(change.boardNum(), link)));
                                changeIds.add(change.changeId());
                                boardToId.put(change.boardNum(), change.boardId);
                        }
                        this.jobId = jobId;
                        this.from = from;
                        this.to = to;
                }

                /**
                 * Change the power state of boards in this request.
                 *
                 * @param controllers
                 *            How to actually communicate with the machine
                 * @throws ProcessException
                 *             If the transceiver chokes
                 * @throws InterruptedException
                 *             If interrupted
                 * @throws IOException
                 *             If network I/O fails
                 */
                void changeBoardPowerState(SpiNNakerControl controller)
                                throws ProcessException, InterruptedException, IOException {

                        // Send any power on commands
                        if (!powerOnBoards.isEmpty()) {
                                controller.powerOnAndCheck(powerOnBoards);
                        }

                        // Process perimeter link requests next
                        for (var linkReq : linkRequests) {
                                // Set the link state, as required
                                controller.setLinkOff(linkReq);
                        }

                        // Finally send any power off commands
                        if (!powerOffBoards.isEmpty()) {
                                controller.powerOff(powerOffBoards);
                        }
                }

                /**
                 * Handles the database changes after a set of changes to a BMP complete
                 * successfully. We will move the job to the state it supposed to be in.
                 *
                 * @param sql
                 *            How to access the DB
                 * @return Whether the state of boards or jobs has changed.
                 */
                private void done() {
                        try (var c = getConnection();
                                        var deallocateBoards = c.update(DEALLOCATE_BMP_BOARDS_JOB);
                                        var deleteChange = c.update(FINISHED_PENDING);
                                        var setBoardPowerOn = c.update(SET_BOARD_POWER_ON);
                                        var setBoardPowerOff = c.update(SET_BOARD_POWER_OFF)) {
                                c.transaction(() -> {
                                        int turnedOn = powerOnBoards.stream().map(this::getBoardId)
                                                        .mapToInt(setBoardPowerOn::call).sum();
                                        int turnedOff =
                                                        powerOffBoards.stream().map(this::getBoardId)
                                                                        .mapToInt(setBoardPowerOff::call).sum();

                                        if (to == DESTROYED || to == QUEUED) {
                                                /*
                                                 * Need to mark the boards as not allocated; can't do
                                                 * that until they've been switched off.
                                                 */
                                                deallocateBoards.call(jobId, bmpId);
                                        }
                                        int completed = changeIds.stream().mapToInt(
                                                        deleteChange::call).sum();

                                        log.debug("BMP ACTION SUCCEEDED ({}:{}->{}): on:{} off:{} "
                                                        + "completed: {}",
                                                        jobId, from, to, turnedOn, turnedOff, completed);
                                });
                        }

                        // Tell the allocator something has happened
                        allocator.updateJob(jobId, from, to);
                }

                /**
                 * Handles the database changes after a set of changes to a BMP complete
                 * with a failure. We will roll back the job state to what it was
                 * before.
                 *
                 * @param sql
                 *            How to access the DB
                 * @return Whether the state of boards or jobs has changed.
                 */
                private void failed() {
                        var resetJobAlloc = false;
                        try (var c = getConnection();
                                        var deallocateBoards = c.update(DEALLOCATE_BMP_BOARDS_JOB);
                                        var deleteChange = c.update(FINISHED_PENDING);
                                        var setBoardPowerOff = c.update(SET_BOARD_POWER_OFF)) {
                                resetJobAlloc = c.transaction(() -> {
                                        // We should mark the boards as off
                                        int turnedOff =
                                                        powerOffBoards.stream().map(this::getBoardId)
                                                                        .mapToInt(setBoardPowerOff::call).sum();

                                        // ... even those that we should be powering on ...
                                        turnedOff +=
                                                        powerOnBoards.stream().map(this::getBoardId)
                                                                        .mapToInt(setBoardPowerOff::call).sum();

                                        // Deallocate the boards on this bmp from the job;
                                        // other boards can be deallocated elsewhere.
                                        deallocateBoards.call(jobId, bmpId);

                                        // Delete change ids as they are done even if failed.
                                        var completed = changeIds.stream().mapToInt(
                                                        deleteChange::call).sum();

                                        log.debug(
                                                        "BMP ACTION FAILED on {} ({}:{}->{}) off:{} "
                                                        + "completed:{}",
                                                        bmpId, jobId, from, to, turnedOff, completed);

                                        // If we were meant to be powering up, reset the allocation
                                        // once done here.
                                        return (to == READY && powerOffBoards.isEmpty());
                                });
                        }
                        if (resetJobAlloc) {
                                allocator.resetPowerOnFailure(jobId);
                        }
                }

                /**
                 * Process an action to power on or off a set of boards. Runs on a
                 * thread that may touch a BMP directly, but which may not touch the
                 * database.
                 *
                 * @param controller
                 *            How to actually reach the BMPs.
                 * @return Whether this action has "succeeded" and shouldn't be retried.
                 * @throws InterruptedException
                 *             If interrupted.
                 */
                @Override
                boolean tryProcessRequest(SpiNNakerControl controller)
                                throws InterruptedException {
                        boolean ok = bmpAction(() -> {
                                changeBoardPowerState(controller);
                                // We want to ensure the lead board is alive
                                if (!serviceControl.isUseDummyBMP()) {
                                        // Don't bother with pings when the dummy is enabled
                                        controller.ping(powerOnBoards);
                                }
                                done();
                        }, e -> {
                                failed();
                                synchronized (BMPController.this) {
                                        bmpProcessingException = e;
                                }
                        }, ppe -> {
                                badBoard(ppe);
                        });
                        return ok;
                }

                @Override
                public String toString() {
                        var sb = new StringBuilder("PowerRequest(for=")
                                        .append(bmpId);
                        sb.append(";on=").append(powerOnBoards);
                        sb.append(",off=").append(powerOffBoards);
                        sb.append(",links=").append(linkRequests);
                        return sb.append(")").toString();
                }

                private static final String REPORT_MSG =
                                "board was not reachable when trying to power it: ";

                /**
                 * When a BMP is unroutable, we must tell the alloc engine to pick
                 * somewhere else, and we should mark the board as out of service too;
                 * it's never going to work so taking it out right away is the only sane
                 * plan. We also need to nuke the planned changes. Retrying is bad.
                 *
                 * @param failure
                 *            The failure message.
                 * @return Whether the state of boards or jobs has changed.
                 */
                private void badBoard(ProcessException failure) {
                        try (var c = getConnection()) {
                                c.transaction(() -> {
                                        getBoardId(failure.source).ifPresent(boardId -> {
                                                // Mark the board as dead right now
                                                markBoardAsDead(c, boardId, REPORT_MSG + failure);
                                                // Add a report if we can
                                                addBoardReport(c, boardId, jobId, REPORT_MSG + failure);
                                        });
                                });
                        }
                }

                /**
                 * Given a board address, get the ID that it corresponds to. Reverses
                 * {@link #idToBoard}.
                 *
                 * @param addr
                 *            The board address.
                 * @return The ID, if one can be found.
                 */
                private Optional<Integer> getBoardId(HasBMPLocation addr) {
                        return Optional.ofNullable(boardToId.get(addr.getBoard()));
                }

                private Integer getBoardId(BMPBoard board) {
                        return boardToId.get(board.board());
                }
        }

        /**
         * A request to read or write information on a BMP. Includes blacklists,
         * serial numbers, temperature data, etc.
         *
         * @author Donal Fellows
         */
        private final class BoardRequest extends Request {
                private final NonBootOperation op;

                private final int opId;

                private final int boardId;

                private final BMPCoords bmp;

                private final BMPBoard board;

                private final String bmpSerialId;

                private final Blacklist blacklist;

                private final int machineId;

                private BoardRequest(int bmpId, NonBootOperation op, Row row) {
                        super(bmpId);
                        this.op = op;
                        opId = row.getInt("op_id");
                        boardId = row.getInt("board_id");
                        bmp = new BMPCoords(row.getInt("cabinet"), row.getInt("frame"));
                        board = new BMPBoard(row.getInt("board_num"));
                        if (op == WRITE_BL) {
                                blacklist = row.getSerial("data", Blacklist.class);
                        } else {
                                blacklist = null;
                        }
                        bmpSerialId = row.getString("bmp_serial_id");
                        machineId = row.getInt("machine_id");
                }

                /** The serial number actually read from the board. */
                private String readSerial;

                /**
                 * Access the DB to store the serial number information that we
                 * retrieved. A transaction should already be held.
                 *
                 * @param c
                 *            How to access the DB
                 * @return Whether we've changed anything
                 */
                private void recordSerialIds(Connection c) {
                        try (var setBoardSerialIds = c.update(SET_BOARD_SERIAL_IDS)) {
                                setBoardSerialIds.call(boardId, readSerial,
                                                phySerMap.getPhysicalId(readSerial));
                        }
                }

                /**
                 * Access the DB to mark the read request as successful and store the
                 * blacklist that was read. A transaction should already be held.
                 *
                 * @param c
                 *            How to access the DB
                 * @param readBlacklist
                 *            The blacklist that was read
                 * @return Whether we've changed anything
                 */
                private void doneReadBlacklist(Connection c, Blacklist readBlacklist) {
                        try (var completed = c.update(COMPLETED_BOARD_INFO_READ)) {
                                log.debug("Completing blacklist read opId {}", opId);
                                completed.call(readBlacklist, opId);
                        }
                }

                /**
                 * Access the DB to mark the write request as successful. A transaction
                 * should already be held.
                 *
                 * @param c
                 *            How to access the DB
                 * @return Whether we've changed anything
                 */
                private void doneWriteBlacklist(Connection c) {
                        try (var completed = c.update(COMPLETED_BLACKLIST_WRITE)) {
                                completed.call(opId);
                        }
                }

                /**
                 * Access the DB to mark the read request as successful; the actual
                 * store of the serial data is elsewhere
                 * ({@link #recordSerialIds(Connection)}). A transaction should already
                 * be held.
                 *
                 * @param c
                 *            How to access the DB
                 * @return Whether we've changed anything
                 */
                private void doneReadSerial(Connection c) {
                        try (var completed = c.update(COMPLETED_GET_SERIAL_REQ)) {
                                completed.call(opId);
                        }
                }

                /**
                 * Access the DB to mark the read request as successful and store the
                 * ADC info that was read. A transaction should be held.
                 *
                 * @param c
                 *            The database connection.
                 */
                private void doneReadTemps(Connection c, ADCInfo adcInfo) {
                        try (var completed = c.update(COMPLETED_BOARD_INFO_READ)) {
                                log.debug("Completing temperature read opId {}", opId);
                                completed.call(adcInfo, opId);
                        }
                }

                /**
                 * Access the DB to mark the request as failed and store the exception.
                 *
                 * @param exn
                 *            The exception that caused the failure.
                 * @return Whether we've changed anything
                 */
                private void failed(Exception exn) {
                        try (var c = getConnection();
                                        var failed = c.update(FAILED_BLACKLIST_OP)) {
                                c.transaction(() -> failed.call(exn, opId));
                        }
                }

                private static final String REPORT_MSG =
                                "board was not reachable when trying to access its blacklist: ";

                /**
                 * Access the DB to mark a board as out of service.
                 *
                 * @param exn
                 *            The exception that caused the failure.
                 * @return Whether we've changed anything
                 */
                void takeOutOfService(Exception exn) {
                        try (var c = getConnection()) {
                                c.transaction(() -> {
                                        addBoardReport(c, boardId, null, REPORT_MSG + exn);
                                        markBoardAsDead(c, boardId, REPORT_MSG + exn);
                                });
                        }
                }

                /**
                 * Process an action to work with a blacklist or serial number. Runs on
                 * a thread that may touch a BMP directly, but which may not touch the
                 * database.
                 *
                 * @param controller
                 *            How to actually reach the BMP.
                 * @return Whether this action has "succeeded" and shouldn't be retried.
                 * @throws InterruptedException
                 *             If interrupted.
                 */
                @Override
                boolean tryProcessRequest(SpiNNakerControl controller)
                                throws InterruptedException {
                        return bmpAction(() -> {
                                switch (op) {
                                case WRITE_BL -> writeBlacklist(controller);
                                case READ_BL -> readBlacklist(controller);
                                case GET_SERIAL -> readSerial(controller);
                                case READ_TEMP ->  readTemps(controller);
                                default -> throw new IllegalArgumentException();
                                }
                                epochs.blacklistChanged(boardId);
                                epochs.machineChanged(machineId);
                        }, e -> {
                                failed(e);
                        }, ppe -> {
                                takeOutOfService(ppe);
                        });
                }

                /**
                 * Process an action to read a blacklist.
                 *
                 * @param controller
                 *            How to actually reach the BMP.
                 * @throws InterruptedException
                 *             If interrupted.
                 * @throws IOException
                 *             If the network is unhappy.
                 * @throws ProcessException
                 *             If the BMP rejects a message.
                 */
                private void readBlacklist(SpiNNakerControl controller)
                                throws InterruptedException, ProcessException, IOException {
                        readSerial = controller.readSerial(board);
                        if (bmpSerialId != null && !bmpSerialId.equals(readSerial)) {
                                /*
                                 * Doesn't match; WARN but keep going; hardware may just be
                                 * remapped behind our back.
                                 */
                                log.warn(
                                                "blacklist read mismatch: expected serial ID '{}' "
                                                                + "not equal to actual serial ID '{}'",
                                                bmpSerialId, readSerial);
                        }
                        var readBlacklist = controller.readBlacklist(board);
                        try (var c = getConnection()) {
                                c.transaction(() -> {
                                        recordSerialIds(c);
                                        doneReadBlacklist(c, readBlacklist);
                                });
                        }
                }

                /**
                 * Process an action to write a blacklist.
                 *
                 * @param controller
                 *            How to actually reach the BMP.
                 * @throws InterruptedException
                 *             If interrupted.
                 * @throws IOException
                 *             If the network is unhappy.
                 * @throws ProcessException
                 *             If the BMP rejects a message.
                 * @throws IllegalStateException
                 *             If the operation is applied to a board other than the one
                 *             that it is expected to apply to.
                 */
                private void writeBlacklist(SpiNNakerControl controller)
                                throws InterruptedException, ProcessException, IOException {
                        readSerial = controller.readSerial(board);
                        if (bmpSerialId != null && !bmpSerialId.equals(readSerial)) {
                                // Doesn't match, so REALLY unsafe to keep going!
                                throw new IllegalStateException(format(
                                                "aborting blacklist write: expected serial ID '%s' "
                                                                + "not equal to actual serial ID '%s'",
                                                bmpSerialId, readSerial));
                        }
                        controller.writeBlacklist(board, requireNonNull(blacklist));
                        try (var c = getConnection()) {
                                c.transaction(() -> doneWriteBlacklist(c));
                        }
                }

                /**
                 * Process an action to read the serial number from a BMP.
                 *
                 * @param controller
                 *            How to actually reach the BMP.
                 * @throws InterruptedException
                 *             If interrupted.
                 * @throws IOException
                 *             If the network is unhappy
                 * @throws ProcessException
                 *             If the BMP rejects a message.
                 */
                private void readSerial(SpiNNakerControl controller)
                                throws InterruptedException, ProcessException, IOException {
                        readSerial = controller.readSerial(board);
                        try (var c = getConnection()) {
                                c.transaction(() -> {
                                        recordSerialIds(c);
                                        doneReadSerial(c);
                                });
                        }
                }

                /**
                 * Process an action to read some temperature data.
                 *
                 * @param controller
                 *            How to actually reach the BMP.
                 * @throws InterruptedException
                 *             If interrupted.
                 * @throws IOException
                 *             If the network is unhappy.
                 * @throws ProcessException
                 *             If the BMP rejects a message.
                 */
                private void readTemps(SpiNNakerControl controller)
                                throws InterruptedException, ProcessException, IOException {
                        var adcInfo = controller.readTemp(board);
                        try (var c = getConnection()) {
                                c.transaction(() -> doneReadTemps(c, adcInfo));
                        }
                }

                @Override
                public String toString() {
                        var sb = new StringBuilder("BoardRequest(for ");
                        sb.append("bmp=").append(bmp);
                        sb.append(",board=").append(boardId);
                        sb.append(",op=").append(op);
                        return sb.append(")").toString();
                }
        }

        private record PowerChange(Integer changeId, int jobId, Integer boardId,
                        Integer boardNum, boolean power, JobState from, JobState to,
                        List<Direction> offLinks) {
                PowerChange(Row row) {
                        this(row.getInteger("change_id"), //
                                        row.getInt("job_id"), //
                                        row.getInteger("board_id"), //
                                        row.getInteger("board_num"), //
                                        row.getBoolean("power"),
                                        row.getEnum("from_state", JobState.class),
                                        row.getEnum("to_state", JobState.class),
                                        List.of(Direction.values()).stream()
                                                        .filter(link -> !row.getBoolean(link.columnName))
                                                        .collect(Collectors.toList()));
                }

                boolean isSameJob(PowerChange p) {
                        return p.jobId == jobId && p.from == from && p.to == to;
                }
        }

        // ----------------------------------------------------------------
        // WORKER IMPLEMENTATION

        /** A worker of a given BMP. */
        private final class Worker implements Runnable {
                /** What are we controlling? */
                private final SpiNNakerControl control;

                /** Which boards are we looking at? */
                private final int bmpId;

                Worker(SpiNNakerControl control, int bmpId) {
                        this.control = control;
                        this.bmpId = bmpId;

                        log.debug("Created worker for boards {}", bmpId);
                }

                /**
                 * Periodically call to update, or trigger externally.
                 */
                @Override
                public synchronized void run() {
                        log.trace("Searching for changes on BMP {}", bmpId);

                        try {
                                var changes = getRequestedOperations();
                                for (var change : changes) {
                                        change.processRequest(control);
                                }
                        } catch (Exception e) {
                                log.error("unhandled exception for BMP '{}'", bmpId, e);
                        }
                }

                /**
                 * Get the things that we want the worker to do. <em>Be very
                 * careful!</em> Because this necessarily involves the database, this
                 * must not touch the BMP handle as those operations take a long time
                 * and we absolutely must not have a transaction open at the same time.
                 *
                 * @return List of operations to perform.
                 */
                private List<Request> getRequestedOperations() {
                        var requests = new ArrayList<Request>();
                        try (var c = getConnection();
                                        var getPowerRequests = c.query(GET_CHANGES);
                                        var getBlacklistReads = c.query(GET_BLACKLIST_READS);
                                        var getBlacklistWrites = c.query(GET_BLACKLIST_WRITES);
                                        var getReadSerialInfos = c.query(GET_SERIAL_INFO_REQS);
                                        var getReadTemps = c.query(GET_TEMP_INFO_REQS)) {
                                c.transaction(false, () -> {
                                        // Batch power requests by job
                                        var powerChanges = new LinkedList<>(
                                                        getPowerRequests.call(PowerChange::new, bmpId));
                                        while (!powerChanges.isEmpty()) {
                                                var change = powerChanges.poll();
                                                var jobChanges = new ArrayList<>(List.of(change));
                                                while (!powerChanges.isEmpty()
                                                                && change.isSameJob(powerChanges.peek())) {
                                                        jobChanges.add(powerChanges.poll());
                                                }
                                                if (!jobChanges.isEmpty()) {
                                                        log.debug("Running job changes {}", jobChanges);
                                                        requests.add(new PowerRequest(bmpId, change.jobId(),
                                                                        change.from(), change.to(), jobChanges));
                                                }
                                        }

                                        // Leave these until quiet
                                        if (requests.isEmpty()) {
                                                requests.addAll(getBlacklistReads.call(
                                                                row -> new BoardRequest(bmpId, READ_BL, row),
                                                                bmpId));
                                        }
                                        if (requests.isEmpty()) {
                                                requests.addAll(getBlacklistWrites.call(
                                                                row -> new BoardRequest(bmpId, WRITE_BL, row),
                                                                bmpId));
                                                requests.addAll(getReadSerialInfos.call(
                                                                row -> new BoardRequest(bmpId, GET_SERIAL, row),
                                                                bmpId));
                                                requests.addAll(getReadTemps.call(
                                                                row -> new BoardRequest(bmpId, READ_TEMP, row),
                                                                bmpId));
                                        }
                                });
                        } catch (Exception e) {
                                log.error("unhandled exception for BMP '{}'", bmpId, e);
                        }
                        return requests;
                }
        }

        /**
         * The testing interface.
         *
         * @hidden
         */
        @ForTestingOnly
        public interface TestAPI {
                /**
                 * Ensure things are set up after a database change that updates the
                 * BMPs in the system.
                 */
                void prepare();

                /**
                 * The core of the scheduler.
                 *
                 * @param millis
                 *            How many milliseconds to sleep before doing a rerun of the
                 *            scheduler. If zero (or less), only one run will be done.
                 * @param bmps
                 *            The BMPs to be updated.
                 * @throws IOException
                 *             If talking to the network fails
                 * @throws SpinnmanException
                 *             If a BMP sends an error back
                 * @throws InterruptedException
                 *             If the wait for workers to spawn fails.
                 */
                void processRequests(long millis, Collection<Integer> bmps)
                                throws IOException, SpinnmanException, InterruptedException;

                /**
                 * The core of the scheduler. Will process for all known BMPs.
                 *
                 * @param millis
                 *            How many milliseconds to sleep before doing a rerun of the
                 *            scheduler. If zero (or less), only one run will be done.
                 * @throws IOException
                 *             If talking to the network fails
                 * @throws SpinnmanException
                 *             If a BMP sends an error back
                 * @throws InterruptedException
                 *             If the wait for workers to spawn fails.
                 */
                void processRequests(long millis)
                                throws IOException, SpinnmanException, InterruptedException;

                /**
                 * Get the most recently thrown BMP processing exception.
                 *
                 * @return Current processing exception.
                 */
                Throwable getBmpException();

                /** Clear the current processing exception. */
                void clearBmpException();
        }

        /**
         * @return The test interface.
         * @deprecated This interface is just for testing.
         * @hidden
         */
        @ForTestingOnly
        @RestrictedApi(explanation = "just for testing", link = "index.html",
                        allowedOnPath = ".*/src/test/java/.*")
        @Deprecated
        public final TestAPI getTestAPI() {
                ForTestingOnly.Utils.checkForTestClassOnStack();
                return new TestAPI() {
                        @Override
                        public void prepare() {
                                makeWorkers();
                        }

                        @Override
                        public void processRequests(long millis, Collection<Integer> bmps)
                                        throws IOException, SpinnmanException,
                                        InterruptedException {
                                /*
                                 * Runs twice because it takes two cycles to fully process a
                                 * request.
                                 */
                                triggerSearch(bmps);
                                if (millis > 0) {
                                        Thread.sleep(millis);
                                        triggerSearch(bmps);
                                }
                        }

                        @Override
                        public void processRequests(long millis) throws IOException,
                                        SpinnmanException, InterruptedException {
                                processRequests(millis, workers.keySet());
                        }

                        @Override
                        public Throwable getBmpException() {
                                synchronized (BMPController.this) {
                                        return bmpProcessingException;
                                }
                        }

                        @Override
                        public void clearBmpException() {
                                synchronized (BMPController.this) {
                                        bmpProcessingException = null;
                                }
                        }
                };
        }
}

SpiNNakerManchester / JavaSpiNNaker / 6310285782

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