{"id":2121,"date":"2020-06-19T11:12:27","date_gmt":"2020-06-19T03:12:27","guid":{"rendered":"https:\/\/coderbee.net\/?p=2121"},"modified":"2020-06-19T11:12:27","modified_gmt":"2020-06-19T03:12:27","slug":"%e4%b8%80%e4%b8%aa%e4%b8%8e-ehcache-%e7%9b%b8%e5%85%b3%e7%9a%84%e6%ad%bb%e9%94%81%e6%a1%88%e4%be%8b","status":"publish","type":"post","link":"https:\/\/coderbee.net\/index.php\/concurrent\/20200619\/2121","title":{"rendered":"\u4e00\u4e2a\u4e0e Ehcache \u76f8\u5173\u7684\u6b7b\u9501\u6848\u4f8b"},"content":{"rendered":"<p>\u6700\u8fd1\u670b\u53cb\u5206\u4eab\u4e00\u4e2a\u4e0e Ehcache \u76f8\u5173\u7684\u6b7b\u9501\u6848\u4f8b\uff0c\u8bb0\u5f55\u4e0b\u3002<\/p>\n<h1>0. \u4e00\u4e2a\u601d\u8003\u9898<\/h1>\n<p>\u7f13\u5b58\u51fb\u7a7f\u662f\u6307\u9ad8\u5e76\u53d1\u7684\u8bf7\u6c42\u8bbf\u95ee\u540c\u4e00\u4e2a key\uff0c\u5f53\u8fd9\u4e2a key \u5931\u6548\u540e\uff0c\u6240\u6709\u7684\u8bf7\u6c42\u90fd\u4f1a\u4f20\u9012\u5230\u6570\u636e\u5e93\uff0c\u6570\u636e\u5e93\u56e0\u800c\u5d29\u6e83\u3002<\/p>\n<p>\u4e3a\u4e86\u9632\u6b62\u6570\u636e\u5e93\u5d29\u6e83\uff0c\u6211\u4eec\u9700\u8981\u5728\u5e94\u7528\u5c42\u9762\u62e6\u622a\u8fd9\u4e9b\u8bf7\u6c42\uff0c\u6bd4\u5982\u63a7\u5236\u4e00\u4e2a\u5e94\u7528\u52a0\u8f7d\u4e00\u4e2a key \u65f6\u53ea\u6709\u4e00\u4e2a\u8bf7\u6c42\u5230\u6570\u636e\u5e93\u3002<\/p>\n<p>\u5982\u679c\u7528\u52a0\u9501\u7684\u65b9\u6cd5\uff0c\u6bcf\u4e2a key \u4e00\u4e2a\u9501\uff0c\u90a3\u4e48 100 \u4e07\u4e2a key \u5c31\u4f1a\u6709 100 \u4e07\u4e2a\u9501\u5b9e\u4f8b\u5728 JVM \u91cc\u3002\u5982\u679c key \u8fc7\u671f\u4e86\uff0c\u9501\u5b9e\u4f8b\u53ef\u80fd\u8fd8\u5f97\u8fc7\u671f\uff0c\u7279\u9ebb\u70e6\u3002<\/p>\n<p>\u5982\u679c\u6240\u6709\u7684 key \u5171\u4eab\u540c\u4e00\u4e2a\u9501\uff0c\u90a3\u4e48\u8fd9\u4e2a\u9501\u5c31\u4f1a\u6210\u4e3a\u74f6\u9888\u3002<\/p>\n<p>\u8be5\u5982\u4f55\u63a7\u5236\u662f\u597d\uff1f<\/p>\n<h1>1. \u80cc\u666f\u8bf4\u660e<\/h1>\n<p>\u4e00\u4e2a\u9762\u5411\u6d77\u91cf\u7528\u6237\u7684 api \u670d\u52a1\uff0c\u9700\u8981\u63d0\u4f9b\u7528\u6237\u4fe1\u606f\u67e5\u8be2\u7684\u529f\u80fd\u3002<\/p>\n<p>\u7f13\u5b58\u6709\u4e24\u5c42\uff0c\u7b2c\u4e00\u5c42\u662f JVM \u5185\u57fa\u4e8e Ehcache \u7684\uff0c\u7b2c\u4e8c\u5c42\u662f memcached \uff0c\u67e5\u627e\u7f13\u5b58\u65f6\u9996\u5148\u4ece\u672c\u673a Ehcache \u67e5\u8be2\uff0c\u627e\u4e0d\u5230\u518d\u53bb memcached \u67e5\u627e\uff0c\u8fd8\u627e\u4e0d\u5230\u5219\u4ece <code>Loader<\/code> \u63a5\u53e3\u52a0\u8f7d\u6570\u636e\u5e76\u5b58\u5165\u76f8\u5e94\u7684\u7f13\u5b58\u3002<\/p>\n<p>\u7528\u6237\u4fe1\u606f\u7531 \u4f1a\u5458\u4fe1\u606f\u3001\u4e2a\u4eba\u4fe1\u606f\u3001\u5bb6\u5ead\u4fe1\u606f \u7b49\u7ec4\u6210\uff0c\u8fd9\u4e9b\u4fe1\u606f\u4f4d\u4e8e\u4e0d\u540c\u7684\u6a21\u5757\uff0c\u5b58\u50a8\u5728\u4e0d\u540c\u7684\u8868\u6216\u5e93\u91cc\u3002<\/p>\n<p>\u5728 Ehcache \u91cc\uff0c\u7528\u6237\u4fe1\u606f\u6709\u4e00\u5c42\u7f13\u5b58\uff0c\u4f1a\u5458\u4fe1\u606f\u3001\u4e2a\u4eba\u4fe1\u606f\u3001\u5bb6\u5ead\u4fe1\u606f \u4e5f\u6709\u5bf9\u5e94\u7684\u7f13\u5b58\u3002<\/p>\n<p>\u4ee5 ID \u4e3a &#8220;007&#8221; \u7684\u7528\u6237\u4e3e\u4f8b\uff0c\u7528\u6237\u4fe1\u606f\u7f13\u5b58\u5bf9\u5e94\u7684 key \u4e3a &#8220;User:007&#8243;\uff0c\u4f1a\u5458\u4fe1\u606f\u5bf9\u5e94\u7684\u7f13\u5b58 key \u4e3a &#8220;member:007&#8243;\uff0c\u4e2a\u4eba\u4fe1\u606f\u5bf9\u5e94\u7684\u7f13\u5b58 key \u4e3a &#8220;personal:007&#8243;\uff0c\u5bb6\u5ead\u4fe1\u606f\u5bf9\u5e94\u7684\u7f13\u5b58 key \u4e3a &#8220;family:007&#8243;\u3002<br \/>\n\u5176\u4e2d\u7528\u6237\u4fe1\u606f\u5bf9\u5e94\u7684\u7f13\u5b58\u7684\u8fc7\u671f\u65f6\u95f4\u662f\u6bd4\u8f83\u77ed\u7684\u3002<\/p>\n<p>\u5f53\u7528\u6237\u4fe1\u606f\u5728\u7f13\u5b58\u91cc\u90fd\u67e5\u627e\u4e0d\u5230\u65f6\uff0c\u5b83\u7684 <code>Loader<\/code> \u5b9e\u73b0\u4f1a\u8c03\u7528 <code>MemerbService<\/code> \u52a0\u8f7d\u4f1a\u5458\u4fe1\u606f\u3001\u8c03\u7528 <code>PersonalService<\/code> \u52a0\u8f7d\u4e2a\u4eba\u4fe1\u606f\uff0c<code>FamilyService \u52a0\u8f7d\u5bb6\u5ead\u4fe1\u606f\uff0c\u7136\u540e\u5408\u5e76\u6210\u7528\u6237\u4fe1\u606f\u4fdd\u5b58\u5728\u7f13\u5b58\u91cc\u3002<\/code>MemerbService\/PersonalService\/FamilyService<code>\u52a0\u8f7d\u4fe1\u606f\u65f6\u4e5f\u662f\u5148\u4ece\u7f13\u5b58\u67e5\u627e\uff0c\u4e24\u7ea7\u7f13\u5b58\u90fd\u67e5\u627e\u4e0d\u5230\u65f6\u4e5f\u8c03\u7528\u5bf9\u5e94\u7684 Loader<\/code> \u4ece\u8868\u91cc\u52a0\u8f7d\u6570\u636e\u3002<\/p>\n<p>\u4f7f\u7528\u7684 Ehcache \u7684\u7248\u672c\u662f ehcache-core-2.6.9 \u3002<\/p>\n<p><!--more--><\/p>\n<h1>2. \u6545\u969c\u73b0\u8c61<\/h1>\n<p>Tomcat \u8fdb\u7a0b\u8fd8\u5728\uff0c\u5185\u5b58\u6b63\u5e38\uff0c\u65b0\u8bf7\u6c42\u90fd\u8d85\u65f6\uff0c\u4ece Java \u7ebf\u7a0b\u6808\u6765\u770b\uff0c\u51fa\u73b0\u4e86\u6b7b\u9501\uff0c\u6ca1\u6709\u7a7a\u95f2\u7684\u7ebf\u7a0b\u53ef\u5904\u7406\u8bf7\u6c42\u3002<\/p>\n<p>\u4e0b\u9762\u662f Java \u7ebf\u7a0b\u6808\u91cc\u7684\u6b7b\u9501\u4fe1\u606f\uff0c\u8131\u654f\u540e\u7684\uff0c\u6bcf\u4e2a\u65b9\u6cd5\u6808\u91cc\u8865\u5145\u4e86\u5df2\u6301\u6709\u7684\u9501\u3002<\/p>\n<pre><code>Full thread dump Java HotSpot(TM) 64-Bit Server VM (24.45-b08 mixed mode):\n\nFound one Java-level deadlock:\n=============================\n\"http-nio-8082-exec-13\":\n  waiting for ownable synchronizer 0x0000000710d41508, (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync),\n  which is held by \"http-nio-8082-exec-195\"\n\"http-nio-8082-exec-195\":\n  waiting for ownable synchronizer 0x0000000710d3ffa8, (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync),\n  which is held by \"http-nio-8082-exec-13\"\n\nJava stack information for the threads listed above:\n===================================================\n\n\"http-nio-8082-exec-13\":\n    at sun.misc.Unsafe.park(Native Method)\n    - parking to wait for  &lt;0x0000000710d41508&gt; (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)\n    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)\n    at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)\n    at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:964)\n    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1282)\n    at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:731)\n    at net.sf.ehcache.store.MemoryOnlyStore.get(MemoryOnlyStore.java:105)\n    at net.sf.ehcache.Cache.searchInStoreWithoutStats(Cache.java:2070)\n    at net.sf.ehcache.Cache.get(Cache.java:1590)\n    at net.coderbee.api.cache.EhcacheService.get(EhcacheService.java:198)\n    at net.coderbee.api.cache.EhcacheService.getOrLoad(EhcacheService.java:84)\n    at net.coderbee.api.service.TemplateService.findOne(TemplateService.java:41)\n    at net.coderbee.api.service.ContentService.getContentVO(ContentService.java:255)\n    at net.coderbee.api.service.ContentService$2.load(ContentService.java:234)\n    at net.coderbee.cache.MemcachedCache.getOrLoad(MemcachedCache.java:43)\n    at net.coderbee.api.cache.EhcacheService.getOrLoad(EhcacheService.java:70)\n\n   Locked ownable synchronizers:\n    - &lt;0x000000070fda8c80&gt; (a java.util.concurrent.ThreadPoolExecutor$Worker)\n    - &lt;0x0000000710d3ffa8&gt; (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)\n\n\"http-nio-8082-exec-195\":\n    at sun.misc.Unsafe.park(Native Method)\n    - parking to wait for  &lt;0x0000000710d3ffa8&gt; (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)\n    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)\n    at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)\n    at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:964)\n    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1282)\n    at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:731)\n    at net.sf.ehcache.store.MemoryOnlyStore.get(MemoryOnlyStore.java:105)\n    at net.sf.ehcache.Cache.searchInStoreWithoutStats(Cache.java:2070)\n    at net.sf.ehcache.Cache.get(Cache.java:1590)\n    at net.coderbee.api.cache.EhcacheService.get(EhcacheService.java:198)\n    at net.coderbee.api.cache.EhcacheService.getOrLoad(EhcacheService.java:62)\n    at net.coderbee.api.service.TemplateService.findOne(TemplateService.java:41)\n    at net.coderbee.api.service.ContentService.getContentVO(ContentService.java:255)\n    at net.coderbee.api.service.ContentService$2.load(ContentService.java:234)\n    at net.coderbee.cache.MemcachedCache.getOrLoad(MemcachedCache.java:43)\n    at net.coderbee.api.cache.EhcacheService.getOrLoad(EhcacheService.java:70)\n\n   Locked ownable synchronizers:\n    - &lt;0x000000070ead0cb8&gt; (a java.util.concurrent.ThreadPoolExecutor$Worker)\n    - &lt;0x0000000710d41508&gt; (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)\n\nFound 1 deadlock.\n<\/code><\/pre>\n<p>\u5176\u4ed6\u7684 HTTP \u5904\u7406\u7ebf\u7a0b\u90fd\u963b\u585e\u5728\u83b7\u53d6\u9501 <code>0x0000000710d41508<\/code> \u548c <code>0x0000000710d3ffa8<\/code> \u4e0a\u3002<\/p>\n<p>\u6b7b\u9501\u662f\u5b9e\u5b9e\u5728\u5728\u7684\uff0c\u4e0a\u9762\u7684\u4e24\u4e2a\u7ebf\u7a0b\u5728\u4e92\u76f8\u7b49\u5f85\u5bf9\u65b9\u6301\u6709\u7684\u9501\u3002<\/p>\n<h1>3. \u6b7b\u9501\u4ee3\u7801\u793a\u4f8b<\/h1>\n<pre><code class=\"java\">public interface Loader {\n    Object load(String key);\n}\n\npublic class MemcachedService {\n    public Object get(String key, Loader loader) {\n        Object val = getFromRemote(key);\n        if (val == null) {\n            \/\/ \u901a\u8fc7 loader \u52a0\u8f7d\u6570\u636e\n            val = loader.load(key);\n            setToRemote(key, val);\n        }\n\n        return val;\n    }\n\n    private Object getFromRemote(String key) {\n        return null;\n    }\n    private void setToRemote(String key, Object val) {\n    }\n}\n\npublic class EhcacheService {\n    \/\/ \u672c\u673a Ehcache \u7f13\u5b58\n    private Cache cache = new Cache(null);\n    \/\/ \u8fdc\u7a0b memcached \u7f13\u5b58\n    private MemcachedService memcachedService = new MemcachedService(); \n\n    public Object get(String key, Loader loader) throws Exception {\n        String ehkey = \"eh:\" + key; \/\/ \u4e0e memcached \u7684\u662f\u4e00\u81f4\u7684\n\n        Object ehvalue = cache.get(ehkey);\n        if (ehvalue == null) {\n            \/\/ \u83b7\u53d6 ehkey \u5bf9\u5e94\u7684 Ehcache \u7f13\u5b58\u7684\u5199\u9501\n            if (cache.tryWriteLockOnKey(ehkey, 0)) {\n                try {\n                    if ((ehvalue = cache.get(ehkey)) == null) {\n                        \/\/ \u4ece memcached \u52a0\u8f7d\n                        ehvalue = memcachedService.get(key, loader);\n                        if (ehvalue != null) {\n                            cache.put(new Element(ehkey, ehvalue));\n                        }\n                    }\n                } finally {\n                    cache.releaseWriteLockOnKey(ehkey);\n                }\n            }\n        } else {\n            \/\/ \u7701\u7565\n        }\n        return ehvalue;\n    }\n}\n<\/code><\/pre>\n<p>\u8bf7\u7ed3\u5408\u80cc\u666f\u4fe1\u606f\u601d\u8003\u6b7b\u9501\u539f\u56e0\uff1f<\/p>\n<h1>4. \u539f\u56e0\u5206\u6790<\/h1>\n<p>\u6211\u4eec\u6765\u770b\u770b\u53d1\u751f\u6b7b\u9501\u7b49\u5f85\u7684\u90a3\u4e00\u884c\u4ee3\u7801\uff1a<\/p>\n<pre><code class=\"java\">public Element get(Object key) {\n    if (key == null) {\n        return null;\n    }\n\n    Lock lock = getLockFor(key).readLock();\n    lock.lock();\n    try {\n        return copyElementForReadIfNeeded(authority.get(key));\n    } finally {\n        lock.unlock();\n    }\n}\n\npublic ReadWriteLock getLockFor(Object key) {\n    return masterLocks.getLockForKey(key);\n}\n<\/code><\/pre>\n<p>\u65e2\u7136\u53d1\u751f\u4e86\u6b7b\u9501\uff0c\u80af\u5b9a\u8981\u77e5\u9053\u7ebf\u7a0b\u8981\u7b49\u5f85\u7684\u662f\u54ea\u628a\u9501\uff0c\u7ee7\u7eed\u770b <code>masterLocks.getLockForKey<\/code> \u7684\u5b9e\u73b0\uff1a<\/p>\n<pre><code>public class StripedReadWriteLockSync implements StripedReadWriteLock {\n    public static final int DEFAULT_NUMBER_OF_MUTEXES = 2048;\n\n    private final ReadWriteLockSync[] mutexes;\n    private final List&lt;ReadWriteLockSync&gt; mutexesAsList;\n\n    public ReadWriteLock getLockForKey(final Object key) {\n        int lockNumber = ConcurrencyUtil.selectLock(key, mutexes.length);\n        return mutexes[lockNumber].getReadWriteLock();\n    }\n}\n\npublic final class ConcurrencyUtil {\n    public static int selectLock(final Object key, int numberOfLocks) throws CacheException {\n        int number = numberOfLocks &amp; (numberOfLocks - 1);\n        if (number != 0) {\n            throw new CacheException(\"Lock number must be a power of two: \" + numberOfLocks);\n        }\n        if (key == null) {\n            return 0;\n        } else {\n            int hash = hash(key) &amp; (numberOfLocks - 1);\n            return hash;\n        }\n    }\n}\n<\/code><\/pre>\n<p>\u4ece\u4e0a\u9762\u53ef\u4ee5\u77e5\u9053\uff0cEhcache \u5e76\u6ca1\u6709\u4e3a\u6bcf\u4e00\u4e2a key \u7ef4\u62a4\u4e00\u4e2a\u9501\uff0c\u800c\u662f\u9ed8\u8ba4\u7ef4\u62a4 2048 \u4e2a\u9501\u5b9e\u4f8b\u7684\u6570\u7ec4\uff0c\u83b7\u53d6\u9501\u65f6\u901a\u8fc7 key \u8ba1\u7b97\u51fa\u54c8\u5e0c\u503c\uff0c\u7136\u540e\u6620\u5c04\u5230\u6570\u7ec4\u4e0b\u6807\uff0c\u53d6\u5bf9\u5e94\u7684\u9501\u5b9e\u4f8b\u3002<\/p>\n<p>\u7528\u4e86\u54c8\u5e0c\u7b97\u6cd5\uff0c\u80af\u5b9a\u4f1a\u51fa\u73b0\u54c8\u5e0c\u51b2\u7a81\uff0c\u8fd9\u6837\u5c31\u4f1a\u51fa\u73b0\u591a\u4e2a key \u7ade\u4e89\u540c\u4e00\u4e2a\u9501\u3002<\/p>\n<p>\u4ece\u4e0a\u9762\u7684\u4ee3\u7801\u4e5f\u53ef\u4ee5\u77e5\u9053\uff0cEhcache \u6bcf\u6b21\u8bfb\u53d6 key \u5bf9\u5e94\u7684\u503c\u65f6\uff0c\u90fd\u4f1a\u5148\u52a0 \u8bfb\u9501\u3002<\/p>\n<p>\u90a3\u4e2a\u601d\u8003\u9898\u4e5f\u53ef\u4ee5\u53c2\u8003 Ehcache \u7684\u8fd9\u4e2a\u601d\u8def\u3002<\/p>\n<p>\u7ed3\u5408\u80cc\u666f\uff0c\u662f\u65f6\u5019\u89e3\u5f00\u8c1c\u5e95\u4e86\u3002<\/p>\n<p>\u5f53\u67e5\u627e\u7528\u6237\u4fe1\u606f\u65f6\uff0c\u5982\u679c Ehcache \u91cc\u4e0d\u5b58\u5728\uff0c\u5219\u4f1a\u8c03\u7528 loader \u52a0\u8f7d\u5b50\u4fe1\u606f\uff0c\u800c\u52a0\u8f7d\u5b50\u4fe1\u606f\u4e5f\u4f1a\u8bbf\u95ee\u7f13\u5b58\uff0c\u4e5f\u5b58\u5728\u52a0\u9501\u7684\u53ef\u80fd\u3002<\/p>\n<pre><code>Object ehvalue = cache.get(ehkey);  \/\/ pos1\uff1a\u52a0\u8bfb\u9501\u3001\u91ca\u653e\u8bfb\u9501\nif (ehvalue == null) {\n    if (cache.tryWriteLockOnKey(ehkey, 0)) { \/\/ pos2\uff1a\u52a0\u5199\u9501\n        try {\n            if ((ehvalue = cache.get(ehkey)) == null) {\n                ehvalue = memcachedService.get(key, loader);\/\/ pos3\uff1a\u53ef\u80fd\u8c03\u7528 loader \u52a0\u8f7d\n                if (ehvalue != null) {\n                    cache.put(new Element(ehkey, ehvalue));\n                }\n            }\n        } finally {\n            cache.releaseWriteLockOnKey(ehkey); \/\/ pos3: \u91ca\u653e\u5199\u9501\n        }\n    }\n}\n\npublic class MemcachedService {\n    public Object get(String key, Loader loader) {\n        Object val = getFromRemote(key);\n        if (val == null) {\n            val = loader.load(key); \/\/ pos4:\n            setToRemote(key, val);\n        }\n\n        return val;\n    }\n<\/code><\/pre>\n<p>\u7ebf\u7a0b A \u6267\u884c\u5230 pos2 \u5bf9\u9501 1 \u8fdb\u884c\u52a0\u9501\uff0c\u7ebf\u7a0b B \u4e5f\u6267\u884c\u5230 pos2 \u5bf9\u9501 2 \u8fdb\u884c\u52a0\u9501\u3002<\/p>\n<p>\u7ebf\u7a0b A \u6267\u884c\u5230 pos3 \u518d\u5230 pos4\uff0cpos4 \u7684 loader \u52a0\u8f7d\u4f1a\u5458\u4fe1\u606f\uff0c\u6b64\u65f6\u52a0\u8f7d\u7684 key \u53d8\u4e86\uff0c\u7ee7\u7eed\u8c03\u56de\u5230 pos1\uff0c\u5bf9\u9501 2 \u52a0\u8bfb\u9501\uff0c\u7531\u4e8e\u9501 2 \u5df2\u7ecf\u88ab\u7ebf\u7a0b B \u6301\u6709\uff0c\u7ebf\u7a0b A \u53ea\u80fd\u7b49\u5f85\u3002<\/p>\n<p>\u7ebf\u7a0b B \u7ee7\u7eed\u6267\u884c pos3\u3001pos4 \u4e5f\u6ca1\u52a0\u8f7d\u5230\u7528\u6237\u4fe1\u606f\uff0c\u6362\u4e00\u4e2a key \u53bb\u52a0\u8f7d\u4f1a\u5458\u4fe1\u606f\uff0c\u7136\u540e\u4e5f\u8c03\u56de\u5230 pos1\uff0c\u6b64\u65f6\u8fd9\u4e2a\u4f1a\u5458\u4fe1\u606f\u7684 key \u521a\u597d\u6620\u5c04\u5230\u9501 1\uff0c\u5c1d\u8bd5\u52a0\u8f7d\u9501 1 \u7684\u8bfb\u9501\uff0c\u800c\u9501 1 \u5df2\u7ecf\u88ab\u7ebf\u7a0b A \u6301\u6709\uff0c\u8fdb\u5165\u7b49\u5f85\u3002<\/p>\n<p>\u81f3\u6b64\uff0c\u5faa\u73af\u7b49\u5f85\u5f62\u6210\uff0c\u6b7b\u9501\u8bde\u751f\u3002<\/p>\n<h1>5. \u5c0f\u7ed3<\/h1>\n<p>\u8fd9\u4e2a\u95ee\u9898\u7684\u6839\u672c\u539f\u56e0\u662f\uff1a\u4e00\u6b21\u8c03\u7528\u5b58\u5728\u4e24\u6b21\u52a0\u9501\uff0c\u5177\u4f53\u52a0\u54ea\u4e2a\u9501\u3001\u52a0\u9501\u7684\u987a\u5e8f\u662f\u7531\u53c2\u6570\u7684\u54c8\u5e0c\u503c\u51b3\u5b9a\u7684\u3002<\/p>\n<p>\u8981\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u4e5f\u5f88\u7b80\u5355\uff0cEhcache \u4e3a\u4e86\u7ef4\u62a4\u6709\u9650\u7684\u9501\u6570\u91cf\uff0c\u5e95\u5c42\u7684\u903b\u8f91\u4e0d\u597d\u53bb\u6539\uff0c\u53ef\u4ee5\u6d88\u9664\u4e00\u6b21\u52a0\u9501\u7684\u884c\u4e3a\u3001\u53d8\u4e3a\u53ea\u6709\u4e00\u6b21\u52a0\u9501\uff0c\u8fd9\u6837\u5c31\u6d88\u9664\u4e86\u6b7b\u9501\u5f62\u6210\u7684\u4e00\u4e2a\u5fc5\u8981\u6761\u4ef6\uff1a\u6301\u6709\u4e00\u4e2a\u9501\uff0c\u5c1d\u8bd5\u5bf9\u53e6\u4e00\u4e2a\u9501\u52a0\u9501\u3002<\/p>\n<p>\u56e0\u6b64\u628a pos2 \u5904\u7684\u52a0\u9501\u884c\u4e3a\u53bb\u6389\u5c31\u884c\u3002<\/p>\n<p>\u6709\u6ca1\u6709\u89c9\u5f97 Ehcache \u8fd9\u4e2a\u57fa\u4e8e key \u7684\u54c8\u5e0c\u503c\u6765\u51b3\u5b9a\u52a0\u54ea\u4e2a\u9501\u7684\u903b\u8f91\u8ddf JDK 1.7 \u91cc ConcurrentHashMap \u7684\u5206\u6bb5\u52a0\u9501\u5f88\u50cf\uff0c^_^\u3002<\/p>\n<hr \/>\n<p>\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u5fae\u4fe1\u516c\u4f17\u53f7: <strong>coderbee\u7b14\u8bb0<\/strong> \u3002<br \/>\n<img loading=\"lazy\" decoding=\"async\" width=\"258\" height=\"258\" src=\"https:\/\/coderbee.net\/wp-content\/uploads\/2019\/01\/coderbee-note.jpg\" class=\"alignnone size-full wp-image-1707\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6700\u8fd1\u670b\u53cb\u5206\u4eab\u4e00\u4e2a\u4e0e Ehcache \u76f8\u5173\u7684\u6b7b\u9501\u6848\u4f8b\uff0c\u8bb0\u5f55\u4e0b\u3002 0. \u4e00\u4e2a\u601d\u8003\u9898  &hellip; <a href=\"https:\/\/coderbee.net\/index.php\/concurrent\/20200619\/2121\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[121],"tags":[347,345,346],"_links":{"self":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/2121"}],"collection":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/comments?post=2121"}],"version-history":[{"count":4,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/2121\/revisions"}],"predecessor-version":[{"id":2125,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/2121\/revisions\/2125"}],"wp:attachment":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/media?parent=2121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/categories?post=2121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/tags?post=2121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}