{"id":4842,"date":"2024-08-01T22:48:00","date_gmt":"2024-08-01T14:48:00","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=4842"},"modified":"2024-08-01T22:48:00","modified_gmt":"2024-08-01T14:48:00","slug":"%e9%9d%a2%e8%af%95%e7%af%87%ef%bc%9aredis-%e5%88%86%e5%b8%83%e5%bc%8f%e9%94%81%e7%9a%84%e6%ad%a3%e7%a1%ae%e5%ae%9e%e7%8e%b0%e6%96%b9%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/spring-boot\/%e9%9d%a2%e8%af%95%e7%af%87%ef%bc%9aredis-%e5%88%86%e5%b8%83%e5%bc%8f%e9%94%81%e7%9a%84%e6%ad%a3%e7%a1%ae%e5%ae%9e%e7%8e%b0%e6%96%b9%e5%bc%8f\/","title":{"rendered":"\u9762\u8bd5\u7bc7\uff1aRedis \u5206\u5e03\u5f0f\u9501\u7684\u6b63\u786e\u5b9e\u73b0\u65b9\u5f0f"},"content":{"rendered":"
\n
\n

\u70b9\u51fb\u201c<\/span>\u7801\u8bed<\/font><\/span>\u201d\uff0c<\/span>\u5173\u6ce8\uff0c\u7f6e\u9876<\/span>\u516c\u4f17\u53f7<\/span><\/p>\n

\u6bcf\u65e5\u6280\u672f\u5e72\u8d27\uff0c\u7b2c\u4e00\u65f6\u95f4\u9001\u8fbe\uff01<\/span><\/span><\/p>\n

<\/span><\/p>\n

\n
\n
\n

1<\/span><\/p>\n

\u524d\u8a00<\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n

<\/span><\/p>\n

\u5206\u5e03\u5f0f\u9501\u4e00\u822c\u6709\u4e09\u79cd\u5b9e\u73b0\u65b9\u5f0f\uff1a<\/span><\/span><\/p>\n

1. \u6570\u636e\u5e93\u4e50\u89c2\u9501\uff1b<\/span><\/span><\/p>\n

2. \u57fa\u4e8eRedis\u7684\u5206\u5e03\u5f0f\u9501\uff1b<\/span><\/span><\/p>\n

3. \u57fa\u4e8eZooKeeper\u7684\u5206\u5e03\u5f0f\u9501\u3002<\/span><\/span><\/p>\n

\u672c\u7bc7\u5c06\u4ecb\u7ecd\u7b2c\u4e8c\u79cd\u65b9\u5f0f\uff0c\u57fa\u4e8eRedis\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u3002<\/span><\/span><\/p>\n

<\/span><\/p>\n

\n
\n
\n

2<\/span><\/p>\n

\u53ef\u9760\u6027<\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n

<\/span><\/p>\n

\u9996\u5148\uff0c\u4e3a\u4e86\u786e\u4fdd\u5206\u5e03\u5f0f\u9501\u53ef\u7528\uff0c\u6211\u4eec\u81f3\u5c11\u8981\u786e\u4fdd\u9501\u7684\u5b9e\u73b0\u540c\u65f6\u6ee1\u8db3\u4ee5\u4e0b\u56db\u4e2a\u6761\u4ef6\uff1a<\/span><\/span><\/p>\n

    \n
  • \n

    \n

    \u4e92\u65a5\u6027<\/span><\/strong>\u3002\u5728\u4efb\u610f\u65f6\u523b\uff0c\u53ea\u6709\u4e00\u4e2a\u5ba2\u6237\u7aef\u80fd\u6301\u6709\u9501\u3002<\/span><\/span><\/p>\n

    \n<\/li>\n

  • \n

    \n

    \u4e0d\u4f1a\u53d1\u751f\u6b7b\u9501<\/span><\/strong>\u3002\u5373\u4f7f\u6709\u4e00\u4e2a\u5ba2\u6237\u7aef\u5728\u6301\u6709\u9501\u7684\u671f\u95f4\u5d29\u6e83\u800c\u6ca1\u6709\u4e3b\u52a8\u89e3\u9501\uff0c\u4e5f\u80fd\u4fdd\u8bc1\u540e\u7eed\u5176\u4ed6\u5ba2\u6237\u7aef\u80fd\u52a0\u9501\u3002<\/span><\/span><\/p>\n

    \n<\/li>\n

  • \n

    \n

    \u5177\u6709\u5bb9\u9519\u6027<\/span><\/strong>\u3002\u53ea\u8981\u5927\u90e8\u5206\u7684Redis\u8282\u70b9\u6b63\u5e38\u8fd0\u884c\uff0c\u5ba2\u6237\u7aef\u5c31\u53ef\u4ee5\u52a0\u9501\u548c\u89e3\u9501\u3002<\/span><\/span><\/p>\n

    \n<\/li>\n

  • \n

    \n

    \u89e3\u94c3\u8fd8\u987b\u7cfb\u94c3\u4eba<\/span><\/strong>\u3002\u52a0\u9501\u548c\u89e3\u9501\u5fc5\u987b\u662f\u540c\u4e00\u4e2a\u5ba2\u6237\u7aef\uff0c\u5ba2\u6237\u7aef\u81ea\u5df1\u4e0d\u80fd\u628a\u522b\u4eba\u52a0\u7684\u9501\u7ed9\u89e3\u4e86\u3002<\/span><\/span><\/p>\n

    \n<\/li>\n<\/ul>\n

    <\/span><\/p>\n

    \n
    \n
    \n

    3<\/span><\/p>\n

    \u4ee3\u7801\u5b9e\u73b0<\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n

    <\/span><\/p>\n

    \u7ec4\u4ef6\u4f9d\u8d56<\/span><\/strong><\/span><\/span><\/p>\n

    \u9996\u5148\u6211\u4eec\u8981\u901a\u8fc7Maven\u5f15\u5165Jedis\u5f00\u6e90\u7ec4\u4ef6\uff0c\u5728pom.xml\u6587\u4ef6\u52a0\u5165\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/span><\/span><\/p>\n

    \n
    <dependency<\/span>><\/span><groupId<\/span>><\/span>redis.clients<\/groupId<\/span>><\/span><artifactId<\/span>><\/span>jedis<\/artifactId<\/span>><\/span><version<\/span>><\/span>2.9.0<\/version<\/span>><\/span><\/dependency<\/span>><\/span><\/span><\/code><\/pre>\n<\/section>\n
    \u52a0\u9501\u4ee3\u7801<\/span><\/strong><\/span><\/span><\/p>\n
    \u6b63\u786e\u59ff\u52bf<\/span><\/strong><\/span><\/span><\/p>\n
    Talk is cheap, show me the code\u3002\u5148\u5c55\u793a\u4ee3\u7801\uff0c\u518d\u5e26\u5927\u5bb6\u6162\u6162\u89e3\u91ca\u4e3a\u4ec0\u4e48\u8fd9\u6837\u5b9e\u73b0\uff1a<\/span><\/span><\/p>\n
    \n
    public<\/span>class<\/span>RedisTool<\/span><\/span>{private<\/span>static<\/span>final<\/span>String LOCK_SUCCESS = "OK"<\/span>;private<\/span>static<\/span>final<\/span>String SET_IF_NOT_EXIST = "NX"<\/span>;private<\/span>static<\/span>final<\/span>String SET_WITH_EXPIRE_TIME = "PX"<\/span>;\/*** \u5c1d\u8bd5\u83b7\u53d6\u5206\u5e03\u5f0f\u9501* @param<\/span>jedis Redis\u5ba2\u6237\u7aef* @param<\/span>lockKey \u9501* @param<\/span>requestId \u8bf7\u6c42\u6807\u8bc6* @param<\/span>expireTime \u8d85\u671f\u65f6\u95f4* @return<\/span>\u662f\u5426\u83b7\u53d6\u6210\u529f*\/<\/span>public<\/span>static<\/span>boolean<\/span>tryGetDistributedLock<\/span>(Jedis jedis, String lockKey, String requestId, int<\/span>expireTime)<\/span><\/span>{String result = jedis.set(lockKey, requestId, SET_IF_NOT_EXIST, SET_WITH_EXPIRE_TIME, expireTime);if<\/span>(LOCK_SUCCESS.equals(result)) {return<\/span>true<\/span>;}return<\/span>false<\/span>;}}<\/span><\/code><\/pre>\n<\/section>\n
    \u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u52a0\u9501\u5c31\u4e00\u884c\u4ee3\u7801\uff1a<\/span>jedis.set(String key, String value, String nxxx, String expx, int time)<\/span>\uff0c\u8fd9\u4e2aset()\u65b9\u6cd5\u4e00\u5171\u6709\u4e94\u4e2a\u5f62\u53c2\uff1a<\/span><\/span><\/p>\n
      \n
    • \n
      \n
      \u7b2c\u4e00\u4e2a\u4e3akey\uff0c\u6211\u4eec\u4f7f\u7528key\u6765\u5f53\u9501\uff0c\u56e0\u4e3akey\u662f\u552f\u4e00\u7684\u3002<\/span><\/span><\/p>\n
      \n<\/li>\n
    • \n
      \n
      \u7b2c\u4e8c\u4e2a\u4e3avalue\uff0c\u6211\u4eec\u4f20\u7684\u662frequestId\uff0c\u5f88\u591a\u7ae5\u978b\u53ef\u80fd\u4e0d\u660e\u767d\uff0c\u6709key\u4f5c\u4e3a\u9501\u4e0d\u5c31\u591f\u4e86\u5417\uff0c\u4e3a\u4ec0\u4e48\u8fd8\u8981\u7528\u5230value\uff1f\u539f\u56e0\u5c31\u662f\u6211\u4eec\u5728\u4e0a\u9762\u8bb2\u5230\u53ef\u9760\u6027\u65f6\uff0c\u5206\u5e03\u5f0f\u9501\u8981\u6ee1\u8db3\u7b2c\u56db\u4e2a\u6761\u4ef6\u89e3\u94c3\u8fd8\u987b\u7cfb\u94c3\u4eba\uff0c\u901a\u8fc7\u7ed9value\u8d4b\u503c\u4e3arequestId\uff0c\u6211\u4eec\u5c31\u77e5\u9053\u8fd9\u628a\u9501\u662f\u54ea\u4e2a\u8bf7\u6c42\u52a0\u7684\u4e86\uff0c\u5728\u89e3\u9501\u7684\u65f6\u5019\u5c31\u53ef\u4ee5\u6709\u4f9d\u636e\u3002requestId\u53ef\u4ee5\u4f7f\u7528UUID.randomUUID().toString()\u65b9\u6cd5\u751f\u6210\u3002<\/span><\/span><\/p>\n
      \n<\/li>\n
    • \n
      \n
      \u7b2c\u4e09\u4e2a\u4e3anxxx\uff0c\u8fd9\u4e2a\u53c2\u6570\u6211\u4eec\u586b\u7684\u662fNX\uff0c\u610f\u601d\u662fSET IF NOT EXIST\uff0c\u5373\u5f53key\u4e0d\u5b58\u5728\u65f6\uff0c\u6211\u4eec\u8fdb\u884cset\u64cd\u4f5c\uff1b\u82e5key\u5df2\u7ecf\u5b58\u5728\uff0c\u5219\u4e0d\u505a\u4efb\u4f55\u64cd\u4f5c\uff1b<\/span><\/span><\/p>\n
      \n<\/li>\n
    • \n
      \n
      \u7b2c\u56db\u4e2a\u4e3aexpx\uff0c\u8fd9\u4e2a\u53c2\u6570\u6211\u4eec\u4f20\u7684\u662fPX\uff0c\u610f\u601d\u662f\u6211\u4eec\u8981\u7ed9\u8fd9\u4e2akey\u52a0\u4e00\u4e2a\u8fc7\u671f\u7684\u8bbe\u7f6e\uff0c\u5177\u4f53\u65f6\u95f4\u7531\u7b2c\u4e94\u4e2a\u53c2\u6570\u51b3\u5b9a\u3002<\/span><\/span><\/p>\n
      \n<\/li>\n
    • \n
      \n
      \u7b2c\u4e94\u4e2a\u4e3atime\uff0c\u4e0e\u7b2c\u56db\u4e2a\u53c2\u6570\u76f8\u547c\u5e94\uff0c\u4ee3\u8868key\u7684\u8fc7\u671f\u65f6\u95f4\u3002<\/span><\/span><\/p>\n
      \n<\/li>\n<\/ul>\n
      \u603b\u7684\u6765\u8bf4\uff0c\u6267\u884c\u4e0a\u9762\u7684set()\u65b9\u6cd5\u5c31\u53ea\u4f1a\u5bfc\u81f4\u4e24\u79cd\u7ed3\u679c\uff1a<\/span><\/span><\/p>\n
      1. \u5f53\u524d\u6ca1\u6709\u9501\uff08key\u4e0d\u5b58\u5728\uff09\uff0c\u90a3\u4e48\u5c31\u8fdb\u884c\u52a0\u9501\u64cd\u4f5c\uff0c\u5e76\u5bf9\u9501\u8bbe\u7f6e\u4e2a\u6709\u6548\u671f\uff0c\u540c\u65f6value\u8868\u793a\u52a0\u9501\u7684\u5ba2\u6237\u7aef\u3002<\/span><\/span><\/p>\n
      2. \u5df2\u6709\u9501\u5b58\u5728\uff0c\u4e0d\u505a\u4efb\u4f55\u64cd\u4f5c\u3002<\/span><\/span><\/p>\n
      \u5fc3\u7ec6\u7684\u7ae5\u978b\u5c31\u4f1a\u53d1\u73b0\u4e86\uff0c\u6211\u4eec\u7684\u52a0\u9501\u4ee3\u7801\u6ee1\u8db3\u6211\u4eec\u53ef\u9760\u6027\u91cc\u63cf\u8ff0\u7684\u4e09\u4e2a\u6761\u4ef6\u3002\u9996\u5148\uff0cset()\u52a0\u5165\u4e86NX\u53c2\u6570\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u5982\u679c\u5df2\u6709key\u5b58\u5728\uff0c\u5219\u51fd\u6570\u4e0d\u4f1a\u8c03\u7528\u6210\u529f\uff0c\u4e5f\u5c31\u662f\u53ea\u6709\u4e00\u4e2a\u5ba2\u6237\u7aef\u80fd\u6301\u6709\u9501\uff0c\u6ee1\u8db3\u4e92\u65a5\u6027\u3002\u5176\u6b21\uff0c\u7531\u4e8e\u6211\u4eec\u5bf9\u9501\u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\uff0c\u5373\u4f7f\u9501\u7684\u6301\u6709\u8005\u540e\u7eed\u53d1\u751f\u5d29\u6e83\u800c\u6ca1\u6709\u89e3\u9501\uff0c\u9501\u4e5f\u4f1a\u56e0\u4e3a\u5230\u4e86\u8fc7\u671f\u65f6\u95f4\u800c\u81ea\u52a8\u89e3\u9501\uff08\u5373key\u88ab\u5220\u9664\uff09\uff0c\u4e0d\u4f1a\u53d1\u751f\u6b7b\u9501\u3002\u6700\u540e\uff0c\u56e0\u4e3a\u6211\u4eec\u5c06value\u8d4b\u503c\u4e3arequestId\uff0c\u4ee3\u8868\u52a0\u9501\u7684\u5ba2\u6237\u7aef\u8bf7\u6c42\u6807\u8bc6\uff0c\u90a3\u4e48\u5728\u5ba2\u6237\u7aef\u5728\u89e3\u9501\u7684\u65f6\u5019\u5c31\u53ef\u4ee5\u8fdb\u884c\u6821\u9a8c\u662f\u5426\u662f\u540c\u4e00\u4e2a\u5ba2\u6237\u7aef\u3002\u7531\u4e8e\u6211\u4eec\u53ea\u8003\u8651Redis\u5355\u673a\u90e8\u7f72\u7684\u573a\u666f\uff0c\u6240\u4ee5\u5bb9\u9519\u6027\u6211\u4eec\u6682\u4e0d\u8003\u8651\u3002<\/span><\/span><\/p>\n
      \u9519\u8bef\u793a\u4f8b1<\/span><\/strong><\/span><\/p>\n
      \u6bd4\u8f83\u5e38\u89c1\u7684\u9519\u8bef\u793a\u4f8b\u5c31\u662f\u4f7f\u7528jedis.setnx()\u548cjedis.expire()\u7ec4\u5408\u5b9e\u73b0\u52a0\u9501\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/span><\/span><\/p>\n
      \n
      public<\/span>static<\/span>void<\/span>wrongGetLock1<\/span>(Jedis jedis, String lockKey, String requestId, int<\/span>expireTime)<\/span><\/span>{Long result = jedis.setnx(lockKey, requestId);if<\/span>(result == 1<\/span>) {\/\/ \u82e5\u5728\u8fd9\u91cc\u7a0b\u5e8f\u7a81\u7136\u5d29\u6e83\uff0c\u5219\u65e0\u6cd5\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u5c06\u53d1\u751f\u6b7b\u9501<\/span>jedis.expire(lockKey, expireTime);}}<\/span><\/code><\/pre>\n<\/section>\n
      setnx()\u65b9\u6cd5\u4f5c\u7528\u5c31\u662f<\/span>SET IF NOT EXIST<\/span>\uff0cexpire()\u65b9\u6cd5\u5c31\u662f\u7ed9\u9501\u52a0\u4e00\u4e2a\u8fc7\u671f\u65f6\u95f4\u3002\u4e4d\u4e00\u770b\u597d\u50cf\u548c\u524d\u9762\u7684set()\u65b9\u6cd5\u7ed3\u679c\u4e00\u6837\uff0c\u7136\u800c\u7531\u4e8e\u8fd9\u662f\u4e24\u6761Redis\u547d\u4ee4\uff0c\u4e0d\u5177\u6709\u539f\u5b50\u6027\uff0c\u5982\u679c\u7a0b\u5e8f\u5728\u6267\u884c\u5b8csetnx()\u4e4b\u540e\u7a81\u7136\u5d29\u6e83\uff0c\u5bfc\u81f4\u9501\u6ca1\u6709\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u3002\u90a3\u4e48\u5c06\u4f1a\u53d1\u751f\u6b7b\u9501\u3002\u7f51\u4e0a\u4e4b\u6240\u4ee5\u6709\u4eba\u8fd9\u6837\u5b9e\u73b0\uff0c\u662f\u56e0\u4e3a\u4f4e\u7248\u672c\u7684jedis\u5e76\u4e0d\u652f\u6301\u591a\u53c2\u6570\u7684set()\u65b9\u6cd5\u3002<\/span><\/span><\/p>\n
      \u9519\u8bef\u793a\u4f8b2<\/span><\/strong><\/span><\/span><\/p>\n
      \u8fd9\u4e00\u79cd\u9519\u8bef\u793a\u4f8b\u5c31\u6bd4\u8f83\u96be\u4ee5\u53d1\u73b0\u95ee\u9898\uff0c\u800c\u4e14\u5b9e\u73b0\u4e5f\u6bd4\u8f83\u590d\u6742\u3002<\/span><\/span><\/p>\n
      \u5b9e\u73b0\u601d\u8def\uff1a\u4f7f\u7528<\/span>jedis.setnx()<\/span>\u547d\u4ee4\u5b9e\u73b0\u52a0\u9501\uff0c\u5176\u4e2dkey\u662f\u9501\uff0cvalue\u662f\u9501\u7684\u8fc7\u671f\u65f6\u95f4\u3002<\/span><\/span><\/p>\n
      \u6267\u884c\u8fc7\u7a0b\uff1a<\/span><\/span><\/p>\n
      1. \u901a\u8fc7setnx()\u65b9\u6cd5\u5c1d\u8bd5\u52a0\u9501\uff0c\u5982\u679c\u5f53\u524d\u9501\u4e0d\u5b58\u5728\uff0c\u8fd4\u56de\u52a0\u9501\u6210\u529f\u3002<\/span><\/span><\/p>\n
      2. \u5982\u679c\u9501\u5df2\u7ecf\u5b58\u5728\u5219\u83b7\u53d6\u9501\u7684\u8fc7\u671f\u65f6\u95f4\uff0c\u548c\u5f53\u524d\u65f6\u95f4\u6bd4\u8f83\uff0c\u5982\u679c\u9501\u5df2\u7ecf\u8fc7\u671f\uff0c\u5219\u8bbe\u7f6e\u65b0\u7684\u8fc7\u671f\u65f6\u95f4\uff0c\u8fd4\u56de\u52a0\u9501\u6210\u529f\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/span><\/span><\/p>\n
      \n
      public<\/span>static<\/span>boolean<\/span>wrongGetLock2(Jedis jedis, String<\/span>lockKey, int expireTime) {long expires = System.currentTimeMillis() + expireTime;String<\/span>expiresStr = String<\/span>.valueOf(expires);\/\/ \u5982\u679c\u5f53\u524d\u9501\u4e0d\u5b58\u5728\uff0c\u8fd4\u56de\u52a0\u9501\u6210\u529f<\/span>if<\/span>(jedis.setnx(lockKey, expiresStr) == 1<\/span>) {return<\/span>true<\/span>;}\/\/ \u5982\u679c\u9501\u5b58\u5728\uff0c\u83b7\u53d6\u9501\u7684\u8fc7\u671f\u65f6\u95f4<\/span>String<\/span>currentValueStr = jedis.get(lockKey);if<\/span>(currentValueStr != null<\/span>&& Long.parseLong(currentValueStr) < System.currentTimeMillis()) {\/\/ \u9501\u5df2\u8fc7\u671f\uff0c\u83b7\u53d6\u4e0a\u4e00\u4e2a\u9501\u7684\u8fc7\u671f\u65f6\u95f4\uff0c\u5e76\u8bbe\u7f6e\u73b0\u5728\u9501\u7684\u8fc7\u671f\u65f6\u95f4<\/span>String<\/span>oldValueStr = jedis.getSet(lockKey, expiresStr);if<\/span>(oldValueStr != null<\/span>&& oldValueStr.equals(currentValueStr)) {\/\/ \u8003\u8651\u591a\u7ebf\u7a0b\u5e76\u53d1\u7684\u60c5\u51b5\uff0c\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u7684\u8bbe\u7f6e\u503c\u548c\u5f53\u524d\u503c\u76f8\u540c\uff0c\u5b83\u624d\u6709\u6743\u5229\u52a0\u9501<\/span>return<\/span>true<\/span>;}}\/\/ \u5176\u4ed6\u60c5\u51b5\uff0c\u4e00\u5f8b\u8fd4\u56de\u52a0\u9501\u5931\u8d25<\/span>return<\/span>false<\/span>;}<\/span><\/code><\/pre>\n<\/section>\n
      \u90a3\u4e48\u8fd9\u6bb5\u4ee3\u7801\u95ee\u9898\u5728\u54ea\u91cc\uff1f<\/span><\/span><\/p>\n
      1. \u7531\u4e8e\u662f\u5ba2\u6237\u7aef\u81ea\u5df1\u751f\u6210\u8fc7\u671f\u65f6\u95f4\uff0c\u6240\u4ee5\u9700\u8981\u5f3a\u5236\u8981\u6c42\u5206\u5e03\u5f0f\u4e0b\u6bcf\u4e2a\u5ba2\u6237\u7aef\u7684\u65f6\u95f4\u5fc5\u987b\u540c\u6b65\u3002<\/span><\/span><\/p>\n
      2. \u5f53\u9501\u8fc7\u671f\u7684\u65f6\u5019\uff0c\u5982\u679c\u591a\u4e2a\u5ba2\u6237\u7aef\u540c\u65f6\u6267\u884c<\/span>jedis.getSet()<\/span>\u65b9\u6cd5\uff0c\u90a3\u4e48\u867d\u7136\u6700\u7ec8\u53ea\u6709\u4e00\u4e2a\u5ba2\u6237\u7aef\u53ef\u4ee5\u52a0\u9501\uff0c\u4f46\u662f\u8fd9\u4e2a\u5ba2\u6237\u7aef\u7684\u9501\u7684\u8fc7\u671f\u65f6\u95f4\u53ef\u80fd\u88ab\u5176\u4ed6\u5ba2\u6237\u7aef\u8986\u76d6\u3002<\/span><\/span><\/p>\n
      3. \u9501\u4e0d\u5177\u5907\u62e5\u6709\u8005\u6807\u8bc6\uff0c\u5373\u4efb\u4f55\u5ba2\u6237\u7aef\u90fd\u53ef\u4ee5\u89e3\u9501\u3002<\/span><\/span><\/p>\n
      \u89e3\u9501\u4ee3\u7801<\/span><\/strong><\/span><\/span><\/p>\n
      \u6b63\u786e\u59ff\u52bf<\/span><\/strong><\/span><\/span><\/p>\n
      \u8fd8\u662f\u5148\u5c55\u793a\u4ee3\u7801\uff0c\u518d\u5e26\u5927\u5bb6\u6162\u6162\u89e3\u91ca\u4e3a\u4ec0\u4e48\u8fd9\u6837\u5b9e\u73b0\uff1a<\/span><\/span><\/p>\n
      \n
      public<\/span>class<\/span>RedisTool<\/span><\/span>{private<\/span>static<\/span>final<\/span>Long RELEASE_SUCCESS = 1<\/span>L;\/*** \u91ca\u653e\u5206\u5e03\u5f0f\u9501* @param<\/span>jedis Redis\u5ba2\u6237\u7aef* @param<\/span>lockKey \u9501* @param<\/span>requestId \u8bf7\u6c42\u6807\u8bc6* @return<\/span>\u662f\u5426\u91ca\u653e\u6210\u529f*\/<\/span>public<\/span>static<\/span>boolean releaseDistributedLock(Jedis jedis, String lockKey, String requestId) {String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end"<\/span>;Object result = jedis.eval<\/span>(script, Collections.singletonList(lockKey), Collections.singletonList(requestId));if<\/span>(RELEASE_SUCCESS.equals(result)) {return<\/span>true<\/span>;}return<\/span>false<\/span>;}}<\/span><\/code><\/pre>\n<\/section>\n
      \u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u89e3\u9501\u53ea\u9700\u8981\u4e24\u884c\u4ee3\u7801\u5c31\u641e\u5b9a\u4e86\uff01\u7b2c\u4e00\u884c\u4ee3\u7801\uff0c\u6211\u4eec\u5199\u4e86\u4e00\u4e2a\u7b80\u5355\u7684Lua\u811a\u672c\u4ee3\u7801\uff0c\u4e0a\u4e00\u6b21\u89c1\u5230\u8fd9\u4e2a\u7f16\u7a0b\u8bed\u8a00\u8fd8\u662f\u5728\u300a\u9ed1\u5ba2\u4e0e\u753b\u5bb6\u300b\u91cc\uff0c\u6ca1\u60f3\u5230\u8fd9\u6b21\u5c45\u7136\u7528\u4e0a\u4e86\u3002\u7b2c\u4e8c\u884c\u4ee3\u7801\uff0c\u6211\u4eec\u5c06Lua\u4ee3\u7801\u4f20\u5230jedis.eval()\u65b9\u6cd5\u91cc\uff0c\u5e76\u4f7f\u53c2\u6570KEYS[1]\u8d4b\u503c\u4e3alockKey\uff0cARGV[1]\u8d4b\u503c\u4e3arequestId\u3002eval()\u65b9\u6cd5\u662f\u5c06Lua\u4ee3\u7801\u4ea4\u7ed9Redis\u670d\u52a1\u7aef\u6267\u884c\u3002<\/span><\/span><\/p>\n
      \u90a3\u4e48\u8fd9\u6bb5Lua\u4ee3\u7801\u7684\u529f\u80fd\u662f\u4ec0\u4e48\u5462\uff1f\u5176\u5b9e\u5f88\u7b80\u5355\uff0c\u9996\u5148\u83b7\u53d6\u9501\u5bf9\u5e94\u7684value\u503c\uff0c\u68c0\u67e5\u662f\u5426\u4e0erequestId\u76f8\u7b49\uff0c\u5982\u679c\u76f8\u7b49\u5219\u5220\u9664\u9501\uff08\u89e3\u9501\uff09\u3002\u90a3\u4e48\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528Lua\u8bed\u8a00\u6765\u5b9e\u73b0\u5462\uff1f\u56e0\u4e3a\u8981\u786e\u4fdd\u4e0a\u8ff0\u64cd\u4f5c\u662f\u539f\u5b50\u6027\u7684\u3002\u5173\u4e8e\u975e\u539f\u5b50\u6027\u4f1a\u5e26\u6765\u4ec0\u4e48\u95ee\u9898\uff0c\u53ef\u4ee5\u9605\u8bfb\u3010\u89e3\u9501\u4ee3\u7801-\u9519\u8bef\u793a\u4f8b2\u3011 \u3002\u90a3\u4e48\u4e3a\u4ec0\u4e48\u6267\u884ceval()\u65b9\u6cd5\u53ef\u4ee5\u786e\u4fdd\u539f\u5b50\u6027\uff0c\u6e90\u4e8eRedis\u7684\u7279\u6027\uff0c\u4e0b\u9762\u662f\u5b98\u7f51\u5bf9eval\u547d\u4ee4\u7684\u90e8\u5206\u89e3\u91ca\uff1a<\/span><\/span><\/p>\n
      \u7b80\u5355\u6765\u8bf4\uff0c\u5c31\u662f\u5728eval\u547d\u4ee4\u6267\u884cLua\u4ee3\u7801\u7684\u65f6\u5019\uff0cLua\u4ee3\u7801\u5c06\u88ab\u5f53\u6210\u4e00\u4e2a\u547d\u4ee4\u53bb\u6267\u884c\uff0c\u5e76\u4e14\u76f4\u5230eval\u547d\u4ee4\u6267\u884c\u5b8c\u6210\uff0cRedis\u624d\u4f1a\u6267\u884c\u5176\u4ed6\u547d\u4ee4\u3002<\/span><\/span><\/p>\n
      \u9519\u8bef\u793a\u4f8b1<\/span><\/strong><\/span><\/span><\/p>\n
      \u6700\u5e38\u89c1\u7684\u89e3\u9501\u4ee3\u7801\u5c31\u662f\u76f4\u63a5\u4f7f\u7528jedis.del()<\/strong>\u65b9\u6cd5\u5220\u9664\u9501\uff0c\u8fd9\u79cd\u4e0d\u5148\u5224\u65ad\u9501\u7684\u62e5\u6709\u8005\u800c\u76f4\u63a5\u89e3\u9501\u7684\u65b9\u5f0f\uff0c\u4f1a\u5bfc\u81f4\u4efb\u4f55\u5ba2\u6237\u7aef\u90fd\u53ef\u4ee5\u968f\u65f6\u8fdb\u884c\u89e3\u9501\uff0c\u5373\u4f7f\u8fd9\u628a\u9501\u4e0d\u662f\u5b83\u7684\u3002<\/span><\/span><\/p>\n
      \n
      public<\/span>static<\/span>void<\/span>wrongReleaseLock1<\/span>(Jedis jedis, String lockKey)<\/span><\/span>{jedis.del(lockKey);}<\/span><\/code><\/pre>\n<\/section>\n
      \u9519\u8bef\u793a\u4f8b2<\/span><\/strong><\/span><\/p>\n
      \u8fd9\u79cd\u89e3\u9501\u4ee3\u7801\u4e4d\u4e00\u770b\u4e5f\u662f\u6ca1\u95ee\u9898\uff0c\u751a\u81f3\u6211\u4e4b\u524d\u4e5f\u5dee\u70b9\u8fd9\u6837\u5b9e\u73b0\uff0c\u4e0e\u6b63\u786e\u59ff\u52bf\u5dee\u4e0d\u591a\uff0c\u552f\u4e00\u533a\u522b\u7684\u662f\u5206\u6210\u4e24\u6761\u547d\u4ee4\u53bb\u6267\u884c\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/span><\/span><\/p>\n
      \n
      public<\/span>static<\/span>void<\/span>wrongReleaseLock2<\/span>(Jedis jedis, String lockKey, String requestId<\/span>) <\/span>{\/\/ \u5224\u65ad\u52a0\u9501\u4e0e\u89e3\u9501\u662f\u4e0d\u662f\u540c\u4e00\u4e2a\u5ba2\u6237\u7aef<\/span>if<\/span>(requestId.equals<\/span>(jedis.get<\/span>(lockKey))) {\/\/ \u82e5\u5728\u6b64\u65f6\uff0c\u8fd9\u628a\u9501\u7a81\u7136\u4e0d\u662f\u8fd9\u4e2a\u5ba2\u6237\u7aef\u7684\uff0c\u5219\u4f1a\u8bef\u89e3\u9501<\/span>jedis.del(lockKey);}}<\/span><\/code><\/pre>\n<\/section>\n
      \u5982\u4ee3\u7801\u6ce8\u91ca\uff0c\u95ee\u9898\u5728\u4e8e\u5982\u679c\u8c03\u7528jedis.del()\u65b9\u6cd5\u7684\u65f6\u5019\uff0c\u8fd9\u628a\u9501\u5df2\u7ecf\u4e0d\u5c5e\u4e8e\u5f53\u524d\u5ba2\u6237\u7aef\u7684\u65f6\u5019\u4f1a\u89e3\u9664\u4ed6\u4eba\u52a0\u7684\u9501\u3002\u90a3\u4e48\u662f\u5426\u771f\u7684\u6709\u8fd9\u79cd\u573a\u666f\uff1f\u7b54\u6848\u662f\u80af\u5b9a\u7684\uff0c\u6bd4\u5982\u5ba2\u6237\u7aefA\u52a0\u9501\uff0c\u4e00\u6bb5\u65f6\u95f4\u4e4b\u540e\u5ba2\u6237\u7aefA\u89e3\u9501\uff0c\u5728\u6267\u884cjedis.del()\u4e4b\u524d\uff0c\u9501\u7a81\u7136\u8fc7\u671f\u4e86\uff0c\u6b64\u65f6\u5ba2\u6237\u7aefB\u5c1d\u8bd5\u52a0\u9501\u6210\u529f\uff0c\u7136\u540e\u5ba2\u6237\u7aefA\u518d\u6267\u884cdel()\u65b9\u6cd5\uff0c\u5219\u5c06\u5ba2\u6237\u7aefB\u7684\u9501\u7ed9\u89e3\u9664\u4e86\u3002<\/span><\/span><\/p>\n
      <\/span><\/p>\n
      \n
      \n
      \n
      4<\/span><\/p>\n
      \u603b\u7ed3<\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n
      \u672c\u6587\u4e3b\u8981\u4ecb\u7ecd\u4e86\u5982\u4f55\u4f7f\u7528Java\u4ee3\u7801\u6b63\u786e\u5b9e\u73b0Redis\u5206\u5e03\u5f0f\u9501\uff0c\u5bf9\u4e8e\u52a0\u9501\u548c\u89e3\u9501\u4e5f\u5206\u522b\u7ed9\u51fa\u4e86\u4e24\u4e2a\u6bd4\u8f83\u7ecf\u5178\u7684\u9519\u8bef\u793a\u4f8b\u3002\u5176\u5b9e\u60f3\u8981\u901a\u8fc7Redis\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u5e76\u4e0d\u96be\uff0c\u53ea\u8981\u4fdd\u8bc1\u80fd\u6ee1\u8db3\u53ef\u9760\u6027\u91cc\u7684\u56db\u4e2a\u6761\u4ef6\u3002\u4e92\u8054\u7f51\u867d\u7136\u7ed9\u6211\u4eec\u5e26\u6765\u4e86\u65b9\u4fbf\uff0c\u53ea\u8981\u6709\u95ee\u9898\u5c31\u53ef\u4ee5google\uff0c\u7136\u800c\u7f51\u4e0a\u7684\u7b54\u6848\u4e00\u5b9a\u662f\u5bf9\u7684\u5417\uff1f\u5176\u5b9e\u4e0d\u7136\uff0c\u6240\u4ee5\u6211\u4eec\u66f4\u5e94\u8be5\u65f6\u523b\u4fdd\u6301\u7740\u8d28\u7591\u7cbe\u795e\uff0c\u591a\u60f3\u591a\u9a8c\u8bc1\u3002<\/span><\/span><\/p>\n
      \u5982\u679c\u4f60\u7684\u9879\u76ee\u4e2dRedis\u662f\u591a\u673a\u90e8\u7f72\u7684\uff0c\u90a3\u4e48\u53ef\u4ee5\u5c1d\u8bd5\u4f7f\u7528Redisson\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\uff0c\u8fd9\u662fRedis\u5b98\u65b9\u63d0\u4f9b\u7684Java\u7ec4\u4ef6\uff0c\u94fe\u63a5\u5728\u53c2\u8003\u9605\u8bfb\u7ae0\u8282\u5df2\u7ecf\u7ed9\u51fa\u3002<\/span><\/span><\/p>\n
      \u53c2\u8003\u9605\u8bfb\uff1ahttps:\/\/wudashan.cn\/2017\/10\/23\/Redis-Distributed-Lock-Implement\/<\/span><\/span><\/p>\n
      PS\uff1a\u9632\u6b62\u627e\u4e0d\u5230\u672c\u7bc7\u6587\u7ae0\uff0c\u53ef\u4ee5\u6536\u85cf\u70b9\u8d5e\uff0c\u65b9\u4fbf\u7ffb\u9605\u67e5\u627e\u54e6\u3002<\/strong><\/span><\/span><\/p>\n
      \n
      \u76ee\u7684\uff1a<\/span><\/strong>\u4e3a\u65b9\u4fbf\u5927\u5bb6\u6280\u672f\u4ea4\u6d41\uff0c\u63d0\u4f9b\u4e00\u4e2a\u66f4\u65b9\u4fbf\u7684\u4ea4\u6d41\u573a\u5730\uff0c\u4f9b\u5927\u5bb6\u4ea4\u6d41<\/span>\u5de5\u4f5c\u4e2d\u9047\u5230\u7684\u95ee\u9898\uff1b\u540c\u65f6\u5171\u540c\u5b66\u4e60\uff0c\u8fdb\u6b65\uff0c\u591a\u4e2a\u670b\u53cb\u591a\u6761\u8def\u3002<\/span><\/span><\/p>\n
      \u6709\u9700\u8981\u8fdb\u7fa4\u7684\u5c0f\u4f19\u4f34\uff0c\u53ef\u4ee5\u52a0\u6211\u7684\u5fae\u4fe1\uff0c\u8bb0\u5f97\u5907\u6ce8<\/span>\u300c\u8fdb\u7fa4<\/span>\u300d<\/strong><\/span>\uff0c\u65b9\u4fbf\u6211\u62c9\u5927\u5bb6\u8fdb\u7fa4\u3002<\/span><\/span><\/p>\n
      \n
      \n
      \n