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Pull Request Pull Request #148: chore(deps): bump maven-deploy-plugin from 3.1.0 to 3.1.1

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/library/src/main/java/com/alibaba/dcm/DnsCacheManipulator.java

package com.alibaba.dcm;

import com.alibaba.dcm.internal.InetAddressCacheUtilCommons;
import com.alibaba.dcm.internal.InetAddressCacheUtilForOld;
import com.alibaba.dcm.internal.InetAddressCacheUtilForNew;
import edu.umd.cs.findbugs.annotations.ReturnValuesAreNonnullByDefault;
import sun.net.InetAddressCachePolicy;

import javax.annotation.Nullable;
import javax.annotation.ParametersAreNonnullByDefault;
import java.io.InputStream;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.regex.Pattern;

import static com.alibaba.dcm.internal.InetAddressCacheUtilCommons.NEVER_EXPIRATION;
import static com.alibaba.dcm.internal.InetAddressCacheUtilCommons.isNewInetAddressImpl;


/**
 * DNS cache manipulator for querying/setting dns(in fact dns cache).
 * <p>
 * Throw {@link DnsCacheManipulatorException} if operation fail for all methods.
 *
 * @author Jerry Lee (oldratlee at gmail dot com)
 * @see DnsCache
 * @see DnsCacheEntry
 * @see DnsCacheManipulatorException
 */
@ParametersAreNonnullByDefault
@ReturnValuesAreNonnullByDefault
public final class DnsCacheManipulator {
    /**
     * Set a <b>never expired</b> dns cache entry.
     *
     * @param host host
     * @param ips  ips
     * @throws DnsCacheManipulatorException Operation fail
     * @see DnsCacheManipulator#setDnsCache(long, java.lang.String, java.lang.String...)
     */
    public static void setDnsCache(String host, String... ips) {
        try {
            if (isNewInetAddressImpl()) {
                InetAddressCacheUtilForNew.setInetAddressCache(host, ips, NEVER_EXPIRATION);
            } else {
                InetAddressCacheUtilForOld.setInetAddressCache(host, ips, NEVER_EXPIRATION);
            }
        } catch (Exception e) {
            final String message = String.format("Fail to setDnsCache for host %s ip %s, cause: %s",
                    host, Arrays.toString(ips), e);
            throw new DnsCacheManipulatorException(message, e);
        }
    }

    /**
     * Set a dns cache entry.
     *
     * @param expireMillis expire time in milliseconds.
     * @param host         host
     * @param ips          ips
     * @throws DnsCacheManipulatorException Operation fail
     */
    public static void setDnsCache(long expireMillis, String host, String... ips) {
        try {
            if (isNewInetAddressImpl()) {
                InetAddressCacheUtilForNew.setInetAddressCache(host, ips, expireMillis);
            } else {
                InetAddressCacheUtilForOld.setInetAddressCache(host, ips, expireMillis);
            }
        } catch (Exception e) {
            final String message = String.format("Fail to setDnsCache for host %s ip %s expireMillis %s, cause: %s",
                    host, Arrays.toString(ips), expireMillis, e);
            throw new DnsCacheManipulatorException(message, e);
        }
    }

    private static final Pattern COMMA_SEPARATOR = Pattern.compile("\\s*,\\s*");

    /**
     * Set dns cache entries by properties.
     *
     * @param properties input properties.<br>
     *                   e.g. {@code www.example.com=42.42.42.42}, <br>
     *                   or value is multiply ips seperated by {@code comma}
     *                   {@code www.example.com=42.42.42.42,43.43.43.43}
     * @throws DnsCacheManipulatorException Operation fail
     */
    public static void setDnsCache(Properties properties) {
        for (Map.Entry<Object, Object> entry : properties.entrySet()) {
            final String host = (String) entry.getKey();
            String ipList = (String) entry.getValue();

            ipList = ipList.trim();
            if (ipList.isEmpty()) continue;

            final String[] ips = COMMA_SEPARATOR.split(ipList);
            setDnsCache(host, ips);
        }
    }

    /**
     * Load dns config from properties file {@code dns-cache.properties} on classpath, then set to dns cache.
     * <p>
     * {@code dns-cache.properties} can be reset/customized by {@code JVM -D option} {@code dcm.config.filename}
     *
     * @throws DnsCacheManipulatorException Operation fail
     * @see DnsCacheManipulator#setDnsCache(java.util.Properties)
     * @see DnsCacheManipulator#loadDnsCacheConfig(java.lang.String)
     */
    public static void loadDnsCacheConfig() {
        final String DCM_CONFIG_FILE_NAME_KEY = "dcm.config.filename";
        final String dcmConfigFileName = System.getProperty(DCM_CONFIG_FILE_NAME_KEY, "dns-cache.properties");
        loadDnsCacheConfig(dcmConfigFileName);
    }

    /**
     * Load dns config from the specified properties file on classpath, then set dns cache.
     *
     * @param propertiesFileName specified properties file name on classpath.
     * @throws DnsCacheManipulatorException Operation fail
     * @see DnsCacheManipulator#setDnsCache(java.util.Properties)
     */
    public static void loadDnsCacheConfig(String propertiesFileName) {
        InputStream inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(propertiesFileName);
        if (inputStream == null) {
            inputStream = DnsCacheManipulator.class.getClassLoader().getResourceAsStream(propertiesFileName);
        }
        if (inputStream == null) {
            throw new DnsCacheManipulatorException("Fail to find " + propertiesFileName + " on classpath!");
        }

        try {
            Properties properties = new Properties();
            properties.load(inputStream);
            inputStream.close();
            setDnsCache(properties);
        } catch (Exception e) {
            final String message = String.format("Fail to loadDnsCacheConfig from %s, cause: %s",
                    propertiesFileName, e);
            throw new DnsCacheManipulatorException(message, e);
        }
    }

    /**
     * Get a dns cache entry by {@code host}.
     *
     * @return dns cache. return {@code null} if no entry for host or dns cache is expired.
     * @throws DnsCacheManipulatorException Operation fail
     */
    @Nullable
    public static DnsCacheEntry getDnsCache(String host) {
        try {
            if (isNewInetAddressImpl()) {
                return InetAddressCacheUtilForNew.getInetAddressCache(host);
            } else {
                return InetAddressCacheUtilForOld.getInetAddressCache(host);
            }
        } catch (Exception e) {
            throw new DnsCacheManipulatorException("Fail to getDnsCache, cause: " + e, e);
        }
    }

    /**
     * Get whole dns cache info {@link DnsCache} including cache and negative cache.
     * <p>
     * If you only need cache without negative cache use convenient method {@link #listDnsCache()}.
     *
     * @return dns cache entries
     * @throws DnsCacheManipulatorException Operation fail
     * @see #listDnsCache()
     * @since 1.2.0
     */
    public static DnsCache getWholeDnsCache() {
        try {
            if (isNewInetAddressImpl()) {
                return InetAddressCacheUtilForNew.listInetAddressCache();
            } else {
                return InetAddressCacheUtilForOld.listInetAddressCache();
            }
        } catch (Exception e) {
            throw new DnsCacheManipulatorException("Fail to getWholeDnsCache, cause: " + e, e);
        }
    }

    /**
     * Get dns cache entries, without negative cache.
     * <p>
     * Same as {@code getWholeDnsCache().getCache()}
     *
     * @return dns cache entries
     * @throws DnsCacheManipulatorException Operation fail
     * @see #getWholeDnsCache()
     * @since 1.2.0
     */
    public static List<DnsCacheEntry> listDnsCache() {
        return getWholeDnsCache().getCache();
    }

    /**
     * Get dns cache entries, without negative cache.
     *
     * @return dns cache entries
     * @throws DnsCacheManipulatorException Operation fail
     * @deprecated this method name is confused: method name is "all" but without negative cache.
     * use {@link #listDnsCache} instead.
     */
    @Deprecated
    @SuppressWarnings("DeprecatedIsStillUsed")
    public static List<DnsCacheEntry> getAllDnsCache() {
        return listDnsCache();
    }

    /**
     * Get dns negative cache entries.
     * <p>
     * Same as {@code getWholeDnsCache().getNegativeCache()}
     *
     * @return dns negative cache entries
     * @throws DnsCacheManipulatorException Operation fail
     * @see #getWholeDnsCache()
     * @since 1.6.0
     */
    public static List<DnsCacheEntry> listDnsNegativeCache() {
        return getWholeDnsCache().getNegativeCache();
    }

    /**
     * Remove dns cache entry(including cache and negative cache), cause lookup dns server for host after.
     *
     * @param host host
     * @throws DnsCacheManipulatorException Operation fail
     * @see DnsCacheManipulator#clearDnsCache
     */
    public static void removeDnsCache(String host) {
        try {
            if (isNewInetAddressImpl()) {
                InetAddressCacheUtilForNew.removeInetAddressCache(host);
            } else {
                InetAddressCacheUtilForOld.removeInetAddressCache(host);
            }
        } catch (Exception e) {
            final String message = String.format("Fail to removeDnsCache for host %s, cause: %s", host, e);
            throw new DnsCacheManipulatorException(message, e);
        }
    }

    /**
     * Clear whole dns cache entries(including cache and negative cache), cause lookup dns server for all host after.
     *
     * @throws DnsCacheManipulatorException Operation fail
     */
    public static void clearDnsCache() {
        try {
            if (isNewInetAddressImpl()) {
                InetAddressCacheUtilForNew.clearInetAddressCache();
            } else {
                InetAddressCacheUtilForOld.clearInetAddressCache();
            }
        } catch (Exception e) {
            throw new DnsCacheManipulatorException("Fail to clearDnsCache, cause: " + e, e);
        }
    }

    /**
     * Get JVM DNS cache policy.
     *
     * @return cache seconds.
     * <ul>
     * <li> {@link InetAddressCachePolicy#FOREVER}({@code -1}) means never expired.(In effect, all negative value)</li>
     * <li> {@link InetAddressCachePolicy#NEVER}({@code 0}) never cached.</li>
     * </ul>
     * @throws DnsCacheManipulatorException Operation fail
     * @see InetAddressCachePolicy#get()
     * @see InetAddressCachePolicy#FOREVER
     * @see InetAddressCachePolicy#NEVER
     * @see InetAddressCachePolicy#DEFAULT_POSITIVE
     * @since 1.3.0
     */
    public static int getDnsCachePolicy() {
        try {
            return InetAddressCacheUtilCommons.getDnsCachePolicy();
        } catch (Exception e) {
            throw new DnsCacheManipulatorException("Fail to getDnsCachePolicy, cause: " + e, e);
        }
    }

    /**
     * Set JVM DNS cache policy.
     * <p>
     * NOTE: if Security Manage is turn on, JVM DNS cache policy set will not take effective. You can check by method {@link #getDnsCachePolicy()}.
     *
     * @param cacheSeconds set default dns cache time. Special input case:
     *                     <ul>
     *                     <li> {@link InetAddressCachePolicy#FOREVER}({@code -1}) means never expired.(In effect, all negative value)</li>
     *                     <li> {@link InetAddressCachePolicy#NEVER}({@code 0}) never cached.</li>
     *                     </ul>
     * @throws DnsCacheManipulatorException Operation fail
     * @see InetAddressCachePolicy
     * @see InetAddressCachePolicy#cachePolicy
     * @see InetAddressCachePolicy#get()
     * @see InetAddressCachePolicy#FOREVER
     * @see InetAddressCachePolicy#NEVER
     * @see InetAddressCachePolicy#DEFAULT_POSITIVE
     * @since 1.3.0
     */
    public static void setDnsCachePolicy(int cacheSeconds) {
        try {
            InetAddressCacheUtilCommons.setDnsCachePolicy(cacheSeconds);
        } catch (Exception e) {
            throw new DnsCacheManipulatorException("Fail to setDnsCachePolicy, cause: " + e, e);
        }
    }

    /**
     * JVM DNS negative cache policy.
     *
     * @return negative cache seconds.
     * <ul>
     * <li> {@link InetAddressCachePolicy#FOREVER}({@code -1}) means never expired.(In effect, all negative value)</li>
     * <li> {@link InetAddressCachePolicy#NEVER}({@code 0}) never cached.</li>
     * </ul>
     * @throws DnsCacheManipulatorException Operation fail
     * @see InetAddressCachePolicy#getNegative()
     * @see InetAddressCachePolicy#FOREVER
     * @see InetAddressCachePolicy#NEVER
     * @since 1.3.0
     */
    public static int getDnsNegativeCachePolicy() {
        try {
            return InetAddressCacheUtilCommons.getDnsNegativeCachePolicy();
        } catch (Exception e) {
            throw new DnsCacheManipulatorException("Fail to getDnsNegativeCachePolicy, cause: " + e, e);
        }
    }

    /**
     * Set JVM DNS negative cache policy.
     *
     * @param negativeCacheSeconds set default dns cache time. Special input case:
     *                             <ul>
     *                             <li> {@link InetAddressCachePolicy#FOREVER}({@code -1}) means never expired.(In effect, all negative value)</li>
     *                             <li> {@link InetAddressCachePolicy#NEVER}({@code 0}) never cached.</li>
     *                             </ul>
     * @throws DnsCacheManipulatorException Operation fail
     * @see InetAddressCachePolicy
     * @see InetAddressCachePolicy#FOREVER
     * @see InetAddressCachePolicy#NEVER
     * @since 1.3.0
     */
    public static void setDnsNegativeCachePolicy(int negativeCacheSeconds) {
        try {
            InetAddressCacheUtilCommons.setDnsNegativeCachePolicy(negativeCacheSeconds);
        } catch (Exception e) {
            throw new DnsCacheManipulatorException("Fail to setDnsNegativeCachePolicy, cause: " + e, e);
        }
    }

    private DnsCacheManipulator() {
    }
}

1	package com.alibaba.dcm;
2
3	import com.alibaba.dcm.internal.InetAddressCacheUtilCommons;
4	import com.alibaba.dcm.internal.InetAddressCacheUtilForOld;
5	import com.alibaba.dcm.internal.InetAddressCacheUtilForNew;
6	import edu.umd.cs.findbugs.annotations.ReturnValuesAreNonnullByDefault;
7	import sun.net.InetAddressCachePolicy;
8
9	import javax.annotation.Nullable;
10	import javax.annotation.ParametersAreNonnullByDefault;
11	import java.io.InputStream;
12	import java.util.Arrays;
13	import java.util.List;
14	import java.util.Map;
15	import java.util.Properties;
16	import java.util.regex.Pattern;
17
18	import static com.alibaba.dcm.internal.InetAddressCacheUtilCommons.NEVER_EXPIRATION;
19	import static com.alibaba.dcm.internal.InetAddressCacheUtilCommons.isNewInetAddressImpl;
20
21
22	/**
23	* DNS cache manipulator for querying/setting dns(in fact dns cache).
24	* <p>
25	* Throw {@link DnsCacheManipulatorException} if operation fail for all methods.
26	*
27	* @author Jerry Lee (oldratlee at gmail dot com)
28	* @see DnsCache
29	* @see DnsCacheEntry
30	* @see DnsCacheManipulatorException
31	*/
32	@ParametersAreNonnullByDefault
33	@ReturnValuesAreNonnullByDefault
34	public final class DnsCacheManipulator {
35	/**
36	* Set a <b>never expired</b> dns cache entry.
37	*
38	* @param host host
39	* @param ips ips
40	* @throws DnsCacheManipulatorException Operation fail
41	* @see DnsCacheManipulator#setDnsCache(long, java.lang.String, java.lang.String...)
42	*/
43	public static void setDnsCache(String host, String... ips) {
44	try {
45	if (isNewInetAddressImpl()) {	1✔
46	InetAddressCacheUtilForNew.setInetAddressCache(host, ips, NEVER_EXPIRATION);	1✔
47	} else {
48	InetAddressCacheUtilForOld.setInetAddressCache(host, ips, NEVER_EXPIRATION);	1✔
49	}
50	} catch (Exception e) {	×
51	final String message = String.format("Fail to setDnsCache for host %s ip %s, cause: %s",	×
52	host, Arrays.toString(ips), e);	×
53	throw new DnsCacheManipulatorException(message, e);	×
54	}	1✔
55	}	1✔
56
57	/**
58	* Set a dns cache entry.
59	*
60	* @param expireMillis expire time in milliseconds.
61	* @param host host
62	* @param ips ips
63	* @throws DnsCacheManipulatorException Operation fail
64	*/
65	public static void setDnsCache(long expireMillis, String host, String... ips) {
66	try {
67	if (isNewInetAddressImpl()) {	1✔
68	InetAddressCacheUtilForNew.setInetAddressCache(host, ips, expireMillis);	1✔
69	} else {
70	InetAddressCacheUtilForOld.setInetAddressCache(host, ips, expireMillis);	1✔
71	}
72	} catch (Exception e) {	×
73	final String message = String.format("Fail to setDnsCache for host %s ip %s expireMillis %s, cause: %s",	×
74	host, Arrays.toString(ips), expireMillis, e);	×
75	throw new DnsCacheManipulatorException(message, e);	×
76	}	1✔
77	}	1✔
78
79	private static final Pattern COMMA_SEPARATOR = Pattern.compile("\\s,\\s");	1✔
80
81	/**
82	* Set dns cache entries by properties.
83	*
84	* @param properties input properties.<br>
85	* e.g. {@code www.example.com=42.42.42.42}, <br>
86	* or value is multiply ips seperated by {@code comma}
87	* {@code www.example.com=42.42.42.42,43.43.43.43}
88	* @throws DnsCacheManipulatorException Operation fail
89	*/
90	public static void setDnsCache(Properties properties) {
91	for (Map.Entry<Object, Object> entry : properties.entrySet()) {	1✔
92	final String host = (String) entry.getKey();	1✔
93	String ipList = (String) entry.getValue();	1✔
94
95	ipList = ipList.trim();	1✔
96	if (ipList.isEmpty()) continue;	1✔
97
98	final String[] ips = COMMA_SEPARATOR.split(ipList);	1✔
99	setDnsCache(host, ips);	1✔
100	}	1✔
101	}	1✔
102
103	/**
104	* Load dns config from properties file {@code dns-cache.properties} on classpath, then set to dns cache.
105	* <p>
106	* {@code dns-cache.properties} can be reset/customized by {@code JVM -D option} {@code dcm.config.filename}
107	*
108	* @throws DnsCacheManipulatorException Operation fail
109	* @see DnsCacheManipulator#setDnsCache(java.util.Properties)
110	* @see DnsCacheManipulator#loadDnsCacheConfig(java.lang.String)
111	*/
112	public static void loadDnsCacheConfig() {
113	final String DCM_CONFIG_FILE_NAME_KEY = "dcm.config.filename";	1✔
114	final String dcmConfigFileName = System.getProperty(DCM_CONFIG_FILE_NAME_KEY, "dns-cache.properties");	1✔
115	loadDnsCacheConfig(dcmConfigFileName);	1✔
116	}	1✔
117
118	/**
119	* Load dns config from the specified properties file on classpath, then set dns cache.
120	*
121	* @param propertiesFileName specified properties file name on classpath.
122	* @throws DnsCacheManipulatorException Operation fail
123	* @see DnsCacheManipulator#setDnsCache(java.util.Properties)
124	*/
125	public static void loadDnsCacheConfig(String propertiesFileName) {
126	InputStream inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(propertiesFileName);	1✔
127	if (inputStream == null) {	1✔
128	inputStream = DnsCacheManipulator.class.getClassLoader().getResourceAsStream(propertiesFileName);	1✔
129	}
130	if (inputStream == null) {	1✔
131	throw new DnsCacheManipulatorException("Fail to find " + propertiesFileName + " on classpath!");	1✔
132	}
133
134	try {
135	Properties properties = new Properties();	1✔
136	properties.load(inputStream);	1✔
137	inputStream.close();	1✔
138	setDnsCache(properties);	1✔
139	} catch (Exception e) {	×
140	final String message = String.format("Fail to loadDnsCacheConfig from %s, cause: %s",	×
141	propertiesFileName, e);
142	throw new DnsCacheManipulatorException(message, e);	×
143	}	1✔
144	}	1✔
145
146	/**
147	* Get a dns cache entry by {@code host}.
148	*
149	* @return dns cache. return {@code null} if no entry for host or dns cache is expired.
150	* @throws DnsCacheManipulatorException Operation fail
151	*/
152	@Nullable
153	public static DnsCacheEntry getDnsCache(String host) {
154	try {
155	if (isNewInetAddressImpl()) {	1✔
156	return InetAddressCacheUtilForNew.getInetAddressCache(host);	1✔
157	} else {
158	return InetAddressCacheUtilForOld.getInetAddressCache(host);	1✔
159	}
160	} catch (Exception e) {	×
161	throw new DnsCacheManipulatorException("Fail to getDnsCache, cause: " + e, e);	×
162	}
163	}
164
165	/**
166	* Get whole dns cache info {@link DnsCache} including cache and negative cache.
167	* <p>
168	* If you only need cache without negative cache use convenient method {@link #listDnsCache()}.
169	*
170	* @return dns cache entries
171	* @throws DnsCacheManipulatorException Operation fail
172	* @see #listDnsCache()
173	* @since 1.2.0
174	*/
175	public static DnsCache getWholeDnsCache() {
176	try {
177	if (isNewInetAddressImpl()) {	1✔
178	return InetAddressCacheUtilForNew.listInetAddressCache();	1✔
179	} else {
180	return InetAddressCacheUtilForOld.listInetAddressCache();	1✔
181	}
182	} catch (Exception e) {	×
183	throw new DnsCacheManipulatorException("Fail to getWholeDnsCache, cause: " + e, e);	×
184	}
185	}
186
187	/**
188	* Get dns cache entries, without negative cache.
189	* <p>
190	* Same as {@code getWholeDnsCache().getCache()}
191	*
192	* @return dns cache entries
193	* @throws DnsCacheManipulatorException Operation fail
194	* @see #getWholeDnsCache()
195	* @since 1.2.0
196	*/
197	public static List<DnsCacheEntry> listDnsCache() {
198	return getWholeDnsCache().getCache();	1✔
199	}
200
201	/**
202	* Get dns cache entries, without negative cache.
203	*
204	* @return dns cache entries
205	* @throws DnsCacheManipulatorException Operation fail
206	* @deprecated this method name is confused: method name is "all" but without negative cache.
207	* use {@link #listDnsCache} instead.
208	*/
209	@Deprecated
210	@SuppressWarnings("DeprecatedIsStillUsed")
211	public static List<DnsCacheEntry> getAllDnsCache() {
212	return listDnsCache();	1✔
213	}
214
215	/**
216	* Get dns negative cache entries.
217	* <p>
218	* Same as {@code getWholeDnsCache().getNegativeCache()}
219	*
220	* @return dns negative cache entries
221	* @throws DnsCacheManipulatorException Operation fail
222	* @see #getWholeDnsCache()
223	* @since 1.6.0
224	*/
225	public static List<DnsCacheEntry> listDnsNegativeCache() {
226	return getWholeDnsCache().getNegativeCache();	1✔
227	}
228
229	/**
230	* Remove dns cache entry(including cache and negative cache), cause lookup dns server for host after.
231	*
232	* @param host host
233	* @throws DnsCacheManipulatorException Operation fail
234	* @see DnsCacheManipulator#clearDnsCache
235	*/
236	public static void removeDnsCache(String host) {
237	try {
238	if (isNewInetAddressImpl()) {	1✔
239	InetAddressCacheUtilForNew.removeInetAddressCache(host);	1✔
240	} else {
241	InetAddressCacheUtilForOld.removeInetAddressCache(host);	1✔
242	}
243	} catch (Exception e) {	×
244	final String message = String.format("Fail to removeDnsCache for host %s, cause: %s", host, e);	×
245	throw new DnsCacheManipulatorException(message, e);	×
246	}	1✔
247	}	1✔
248
249	/**
250	* Clear whole dns cache entries(including cache and negative cache), cause lookup dns server for all host after.
251	*
252	* @throws DnsCacheManipulatorException Operation fail
253	*/
254	public static void clearDnsCache() {
255	try {
256	if (isNewInetAddressImpl()) {	1✔
257	InetAddressCacheUtilForNew.clearInetAddressCache();	1✔
258	} else {
259	InetAddressCacheUtilForOld.clearInetAddressCache();	1✔
260	}
261	} catch (Exception e) {	×
262	throw new DnsCacheManipulatorException("Fail to clearDnsCache, cause: " + e, e);	×
263	}	1✔
264	}	1✔
265
266	/**
267	* Get JVM DNS cache policy.
268	*
269	* @return cache seconds.
270	* <ul>
271	* <li> {@link InetAddressCachePolicy#FOREVER}({@code -1}) means never expired.(In effect, all negative value)</li>
272	* <li> {@link InetAddressCachePolicy#NEVER}({@code 0}) never cached.</li>
273	* </ul>
274	* @throws DnsCacheManipulatorException Operation fail
275	* @see InetAddressCachePolicy#get()
276	* @see InetAddressCachePolicy#FOREVER
277	* @see InetAddressCachePolicy#NEVER
278	* @see InetAddressCachePolicy#DEFAULT_POSITIVE
279	* @since 1.3.0
280	*/
281	public static int getDnsCachePolicy() {
282	try {
283	return InetAddressCacheUtilCommons.getDnsCachePolicy();	1✔
284	} catch (Exception e) {	×
285	throw new DnsCacheManipulatorException("Fail to getDnsCachePolicy, cause: " + e, e);	×
286	}
287	}
288
289	/**
290	* Set JVM DNS cache policy.
291	* <p>
292	* NOTE: if Security Manage is turn on, JVM DNS cache policy set will not take effective. You can check by method {@link #getDnsCachePolicy()}.
293	*
294	* @param cacheSeconds set default dns cache time. Special input case:
295	* <ul>
296	* <li> {@link InetAddressCachePolicy#FOREVER}({@code -1}) means never expired.(In effect, all negative value)</li>
297	* <li> {@link InetAddressCachePolicy#NEVER}({@code 0}) never cached.</li>
298	* </ul>
299	* @throws DnsCacheManipulatorException Operation fail
300	* @see InetAddressCachePolicy
301	* @see InetAddressCachePolicy#cachePolicy
302	* @see InetAddressCachePolicy#get()
303	* @see InetAddressCachePolicy#FOREVER
304	* @see InetAddressCachePolicy#NEVER
305	* @see InetAddressCachePolicy#DEFAULT_POSITIVE
306	* @since 1.3.0
307	*/
308	public static void setDnsCachePolicy(int cacheSeconds) {
309	try {
310	InetAddressCacheUtilCommons.setDnsCachePolicy(cacheSeconds);	1✔
311	} catch (Exception e) {	×
312	throw new DnsCacheManipulatorException("Fail to setDnsCachePolicy, cause: " + e, e);	×
313	}	1✔
314	}	1✔
315
316	/**
317	* JVM DNS negative cache policy.
318	*
319	* @return negative cache seconds.
320	* <ul>
321	* <li> {@link InetAddressCachePolicy#FOREVER}({@code -1}) means never expired.(In effect, all negative value)</li>
322	* <li> {@link InetAddressCachePolicy#NEVER}({@code 0}) never cached.</li>
323	* </ul>
324	* @throws DnsCacheManipulatorException Operation fail
325	* @see InetAddressCachePolicy#getNegative()
326	* @see InetAddressCachePolicy#FOREVER
327	* @see InetAddressCachePolicy#NEVER
328	* @since 1.3.0
329	*/
330	public static int getDnsNegativeCachePolicy() {
331	try {
332	return InetAddressCacheUtilCommons.getDnsNegativeCachePolicy();	1✔
333	} catch (Exception e) {	×
334	throw new DnsCacheManipulatorException("Fail to getDnsNegativeCachePolicy, cause: " + e, e);	×
335	}
336	}
337
338	/**
339	* Set JVM DNS negative cache policy.
340	*
341	* @param negativeCacheSeconds set default dns cache time. Special input case:
342	* <ul>
343	* <li> {@link InetAddressCachePolicy#FOREVER}({@code -1}) means never expired.(In effect, all negative value)</li>
344	* <li> {@link InetAddressCachePolicy#NEVER}({@code 0}) never cached.</li>
345	* </ul>
346	* @throws DnsCacheManipulatorException Operation fail
347	* @see InetAddressCachePolicy
348	* @see InetAddressCachePolicy#FOREVER
349	* @see InetAddressCachePolicy#NEVER
350	* @since 1.3.0
351	*/
352	public static void setDnsNegativeCachePolicy(int negativeCacheSeconds) {
353	try {
354	InetAddressCacheUtilCommons.setDnsNegativeCachePolicy(negativeCacheSeconds);	1✔
355	} catch (Exception e) {	×
356	throw new DnsCacheManipulatorException("Fail to setDnsNegativeCachePolicy, cause: " + e, e);	×
357	}	1✔
358	}	1✔
359
360	private DnsCacheManipulator() {
361	}
362	}

alibaba / java-dns-cache-manipulator / 1166

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