{"id":201417,"date":"2025-05-10T11:48:42","date_gmt":"2025-05-10T03:48:42","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201417\/"},"modified":"2025-05-10T11:48:42","modified_gmt":"2025-05-10T03:48:42","slug":"redis%e9%94%81%e8%a2%ab%e5%88%ab%e4%ba%ba%e9%87%8a%e6%94%be%e6%80%8e%e4%b9%88%e5%8a%9e","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201417\/","title":{"rendered":"Redis\u9501\u88ab\u522b\u4eba\u91ca\u653e\u600e\u4e48\u529e"},"content":{"rendered":"

<\/b> <\/p>\n

Redis\u9501\u88ab\u522b\u4eba\u91ca\u653e\u600e\u4e48\u529e<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u600e\u4e48\u5165\u95e8\u6570\u636e\u5e93\u7f16\u7a0b\uff1f\u9700\u8981\u5b66\u4e60\u54ea\u4e9b\u77e5\u8bc6\u70b9\uff1f\u8fd9\u662f\u65b0\u624b\u4eec\u521a\u63a5\u89e6\u7f16\u7a0b\u65f6\u5e38\u89c1\u7684\u95ee\u9898\uff1b\u4e0b\u9762golang\u5b66\u4e60\u7f51\u5c31\u6765\u7ed9\u5927\u5bb6\u6574\u7406\u5206\u4eab\u4e00\u4e9b\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u591f\u7ed9\u521d\u5b66\u8005\u4e00\u4e9b\u5e2e\u52a9\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u4ecb\u7ecd\u300aRedis\u9501\u88ab\u522b\u4eba\u91ca\u653e\u600e\u4e48\u529e\u300b\uff0c\u6d89\u53ca\u5230\u5206\u5e03\u5f0f\u3001Redis\u3001\u9501\uff0c\u6709\u9700\u8981\u7684\u53ef\u4ee5\u6536\u85cf\u4e00\u4e0b<\/p>\n

 <\/h3>\n

\u672c\u6587\u8f6c\u8f7d\u81ea\u5fae\u4fe1\u516c\u4f17\u53f7\u300c\u540e\u7aefQ\u300d\uff0c\u4f5c\u8005conan \u3002\u8f6c\u8f7d\u672c\u6587\u8bf7\u8054\u7cfb\u540e\u7aefQ\u516c\u4f17\u53f7\u3002<\/p>\n

\u4ec0\u4e48\u662f\u5206\u5e03\u5f0f\u9501?<\/h3>\n

\u8981\u4ecb\u7ecd\u5206\u5e03\u5f0f\u9501\uff0c\u9996\u5148\u8981\u63d0\u5230\u4e0e\u5206\u5e03\u5f0f\u9501\u76f8\u5bf9\u5e94\u7684\u662f\u7ebf\u7a0b\u9501\u3001\u8fdb\u7a0b\u9501\u3002<\/p>\n

\u7ebf\u7a0b\u9501\uff1a\u4e3b\u8981\u7528\u6765\u7ed9\u65b9\u6cd5\u3001\u4ee3\u7801\u5757\u52a0\u9501\u3002\u5f53\u67d0\u4e2a\u65b9\u6cd5\u6216\u4ee3\u7801\u4f7f\u7528\u9501\uff0c\u5728\u540c\u4e00\u65f6\u523b\u4ec5\u6709\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u8be5\u65b9\u6cd5\u6216\u8be5\u4ee3\u7801\u6bb5\u3002\u7ebf\u7a0b\u9501\u53ea\u5728\u540c\u4e00JVM\u4e2d\u6709\u6548\u679c\uff0c\u56e0\u4e3a\u7ebf\u7a0b\u9501\u7684\u5b9e\u73b0\u5728\u6839\u672c\u4e0a\u662f\u4f9d\u9760\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u5185\u5b58\u5b9e\u73b0\u7684\uff0c\u6bd4\u5982synchronized\u662f\u5171\u4eab\u5bf9\u8c61\u5934\uff0c\u663e\u793a\u9501Lock\u662f\u5171\u4eab\u67d0\u4e2a\u53d8\u91cf(state)\u3002<\/p>\n

\u8fdb\u7a0b\u9501\uff1a\u4e3a\u4e86\u63a7\u5236\u540c\u4e00\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u591a\u4e2a\u8fdb\u7a0b\u8bbf\u95ee\u67d0\u4e2a\u5171\u4eab\u8d44\u6e90\uff0c\u56e0\u4e3a\u8fdb\u7a0b\u5177\u6709\u72ec\u7acb\u6027\uff0c\u5404\u4e2a\u8fdb\u7a0b\u65e0\u6cd5\u8bbf\u95ee\u5176\u4ed6\u8fdb\u7a0b\u7684\u8d44\u6e90\uff0c\u56e0\u6b64\u65e0\u6cd5\u901a\u8fc7synchronized\u7b49\u7ebf\u7a0b\u9501\u5b9e\u73b0\u8fdb\u7a0b\u9501\u3002<\/p>\n

\u95ee\u9898\u7aa5\u63a2<\/h3>\n

\u5206\u5e03\u5f0f\u9501\uff1a\u5f53\u591a\u4e2a\u8fdb\u7a0b\u4e0d\u5728\u540c\u4e00\u4e2a\u7cfb\u7edf\u4e2d\uff0c\u7528\u5206\u5e03\u5f0f\u9501\u63a7\u5236\u591a\u4e2a\u8fdb\u7a0b\u5bf9\u8d44\u6e90\u7684\u8bbf\u95ee\u3002\u6709\u8fd9\u6837\u4e00\u4e2a\u60c5\u5883\uff0c\u7ebf\u7a0bA\u548c\u7ebf\u7a0bB\u90fd\u5171\u4eab\u67d0\u4e2a\u53d8\u91cfX\u3002\u5982\u679c\u662f\u5206\u5e03\u5f0f\u60c5\u51b5\u4e0b\uff0c\u7ebf\u7a0bA\u548c\u7ebf\u7a0bB\u5f88\u53ef\u80fd\u4e0d\u662f\u5728\u540c\u4e00\u5bf9\u8c61\u4e2d\uff0c\u6bcf\u4e2a\u5ba2\u6237\u7aef\u5728\u91ca\u653e\u9501\u65f6\uff0c\u90fd\u662f\u5220\u9664\u64cd\u4f5c\uff0c\u5e76\u6ca1\u6709\u68c0\u67e5\u8fd9\u628a\u9501\u662f\u5426\u8fd8\u662f\u81ea\u5df1\u7684\uff0c\u6240\u4ee5\u5c31\u4f1a\u53d1\u751f\u91ca\u653e\u522b\u4eba\u9501\u7684\u98ce\u9669\u3002<\/p>\n

\u89e3\u51b3\u529e\u6cd5<\/h3>\n

\u5ba2\u6237\u7aef\u5728\u52a0\u9501\u65f6\uff0c\u8bbe\u7f6e\u4e00\u4e2a\u53ea\u6709\u81ea\u5df1\u77e5\u9053\u7684\u552f\u4e00\u6807\u8bc6\u8fdb\u53bb\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u662f\u81ea\u5df1\u7684\u7ebf\u7a0b ID\uff0c\u4e5f\u53ef\u4ee5\u662f\u4e00\u4e2a UUID(\u968f\u673a\u4e14\u552f\u4e00)\uff0c\u8fd9\u91cc\u6211\u4eec\u4ee5 UUID \u4e3e\u4f8b\uff1a<\/p>\n<\/p>\n

\/\/ \u9501\u7684VALUE\u8bbe\u7f6e\u4e3aUUID \r\n127.0.0.1:6379> SET lock $uuid EX 20 NX \r\nOK \r\n<\/pre>\n
\u8fd9\u91cc\u5047\u8bbe 20s \u64cd\u4f5c\u5171\u4eab\u65f6\u95f4\u5b8c\u5168\u8db3\u591f\uff0c\u5148\u4e0d\u8003\u8651\u9501\u81ea\u52a8\u8fc7\u671f\u7684\u95ee\u9898\u3002\u4e4b\u540e\uff0c\u5728\u91ca\u653e\u9501\u65f6\uff0c\u8981\u5148\u5224\u65ad\u8fd9\u628a\u9501\u662f\u5426\u8fd8\u5f52\u81ea\u5df1\u6301\u6709\uff0c\u4f2a\u4ee3\u7801\u53ef\u4ee5\u8fd9\u4e48\u5199\uff1a<\/p>\n<\/p>\n
if redis.get(\"lock\") == $uuid: \r\n    redis.del(\"lock\") \r\n<\/pre>\n
\u8fd9\u91cc\u91ca\u653e\u9501\u4f7f\u7528\u7684\u662f GET + DEL \u4e24\u6761\u547d\u4ee4\uff0c\u8fd9\u65f6\uff0c\u53c8\u4f1a\u9047\u5230\u6211\u4eec\u524d\u9762\u8bb2\u7684\u539f\u5b50\u6027\u95ee\u9898\u4e86\u3002<\/p>\n
\u5ba2\u6237\u7aef 1 \u6267\u884c GET\uff0c\u5224\u65ad\u9501\u662f\u81ea\u5df1\u7684<\/p>\n
\u5ba2\u6237\u7aef 2 \u6267\u884c\u4e86 SET \u547d\u4ee4\uff0c\u5f3a\u5236\u83b7\u53d6\u5230\u9501(\u867d\u7136\u53d1\u751f\u6982\u7387\u6bd4\u8f83\u4f4e\uff0c\u4f46\u6211\u4eec\u9700\u8981\u4e25\u8c28\u5730\u8003\u8651\u9501\u7684\u5b89\u5168\u6027\u6a21\u578b)<\/p>\n
\u5ba2\u6237\u7aef 1 \u6267\u884c DEL\uff0c\u5374\u91ca\u653e\u4e86\u5ba2\u6237\u7aef 2 \u7684\u9501<\/p>\n
\u7531\u6b64\u53ef\u89c1\uff0c\u8fd9\u4e24\u4e2a\u547d\u4ee4\u8fd8\u662f\u5fc5\u987b\u8981\u539f\u5b50\u6267\u884c\u624d\u884c\u3002<\/p>\n
\u600e\u6837\u539f\u5b50\u6267\u884c\u5462?Lua \u811a\u672c\u3002<\/p>\n
\u6211\u4eec\u53ef\u4ee5\u628a\u8fd9\u4e2a\u903b\u8f91\uff0c\u5199\u6210 Lua \u811a\u672c\uff0c\u8ba9 Redis \u6765\u6267\u884c\u3002<\/p>\n
\u56e0\u4e3a Redis \u5904\u7406\u6bcf\u4e00\u4e2a\u8bf7\u6c42\u662f\u5355\u7ebf\u7a0b\u6267\u884c\u7684\uff0c\u5728\u6267\u884c\u4e00\u4e2a Lua \u811a\u672c\u65f6\uff0c\u5176\u5b83\u8bf7\u6c42\u5fc5\u987b\u7b49\u5f85\uff0c\u76f4\u5230\u8fd9\u4e2a Lua \u811a\u672c\u5904\u7406\u5b8c\u6210\uff0c\u8fd9\u6837\u4e00\u6765\uff0cGET + DEL \u4e4b\u95f4\u5c31\u4e0d\u4f1a\u63d2\u5165\u5176\u5b83\u547d\u4ee4\u4e86\u3002\u5b89\u5168\u91ca\u653e\u9501\u7684 Lua \u811a\u672c\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
if redis.call(\"GET\",KEYS[1]) == ARGV[1] \r\nthen \r\n    return redis.call(\"DEL\",KEYS[1]) \r\nelse \r\n    return 0 \r\nend \r\n<\/pre>\n
\u597d\u4e86\uff0c\u8fd9\u6837\u4e00\u8def\u4f18\u5316\uff0c\u6574\u4e2a\u7684\u52a0\u9501\u3001\u89e3\u9501\u7684\u6d41\u7a0b\u5c31\u66f4\u4e25\u8c28\u4e86\u3002<\/p>\n
\u8fd9\u91cc\u6211\u4eec\u5148\u5c0f\u7ed3\u4e00\u4e0b\uff0c\u57fa\u4e8e Redis \u5b9e\u73b0\u7684\u5206\u5e03\u5f0f\u9501\uff0c\u4e00\u4e2a\u4e25\u8c28\u7684\u7684\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
\u52a0\u9501\uff1aSET lock_key $unique_id EX $expire_time NX \r\n<\/pre>\n
\u64cd\u4f5c\u5171\u4eab\u8d44\u6e90 \u91ca\u653e\u9501\uff1aLua \u811a\u672c\uff0c\u5148 GET \u5224\u65ad\u9501\u662f\u5426\u5f52\u5c5e\u81ea\u5df1\uff0c\u518d DEL \u91ca\u653e\u9501<\/p>\n","protected":false},"excerpt":{"rendered":"
Redis\u9501\u88ab\u522b\u4eba\u91ca\u653e\u600e\u4e48\u529e \u6536...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-201417","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201417","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=201417"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201417\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201417"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201417"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201417"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}