{"id":159691,"date":"2024-11-03T16:46:24","date_gmt":"2024-11-03T08:46:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/159691\/"},"modified":"2024-11-03T16:46:25","modified_gmt":"2024-11-03T08:46:25","slug":"%e7%b4%85%e8%89%b2%e5%8f%b2%e5%af%86%e6%96%af%e6%a7%8b%e5%bb%ba%e5%88%86%e4%bd%88%e5%bc%8f%e9%9b%86%e7%be%a3%e7%9a%84setnx%ef%bc%88redis%e9%9b%86%e7%be%a3setnx%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/159691\/","title":{"rendered":"\u7d05\u8272\u53f2\u5bc6\u65af\u69cb\u5efa\u5206\u4f48\u5f0f\u96c6\u7fa3\u7684setnx\uff08redis\u96c6\u7fa3setnx\uff09"},"content":{"rendered":"<h1 id=\"%e7%b4%85%e8%89%b2%e5%8f%b2%e5%af%86%e6%96%af%e6%a7%8b%e5%bb%ba%e5%88%86%e4%bd%88%e5%bc%8f%e9%9b%86%e7%be%a3%e7%9a%84setnx%ef%bc%88redis%e9%9b%86%e7%be%a3setnx%ef%bc%89-MjkRGQKWaz\">\u7d05\u8272\u53f2\u5bc6\u65af\u69cb\u5efa\u5206\u4f48\u5f0f\u96c6\u7fa3\u7684setnx\uff08redis\u96c6\u7fa3setnx\uff09<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0c\u5206\u4f48\u5f0f\u7cfb\u7d71\u7684\u9700\u6c42\u65e5\u76ca\u589e\u52a0\u3002Redis\u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u5b58\u5132\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u5834\u666f\u4e2d\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u9ad8\u6027\u80fd\u548c\u9ad8\u53ef\u7528\u6027\u7684\u61c9\u7528\u4e2d\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528Redis\u7684setnx\u547d\u4ee4\u4f86\u69cb\u5efa\u5206\u4f48\u5f0f\u96c6\u7fa3\uff0c\u4e26\u4ecb\u7d39\u5176\u5728\u7d05\u8272\u53f2\u5bc6\u65af\uff08Redisson\uff09\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afsetnx%e5%91%bd%e4%bb%a4%ef%bc%9f-MjkRGQKWaz\">\u4ec0\u9ebc\u662fsetnx\u547d\u4ee4\uff1f<\/h2>\n<p>setnx\u662fRedis\u4e2d\u7684\u4e00\u500b\u547d\u4ee4\uff0c\u5176\u5168\u540d\u70ba\u201cSET if Not eXists\u201d\u3002\u9019\u500b\u547d\u4ee4\u7684\u4e3b\u8981\u529f\u80fd\u662f\u8a2d\u7f6e\u4e00\u500b\u9375\u7684\u503c\uff0c\u53ea\u6709\u5728\u8a72\u9375\u4e0d\u5b58\u5728\u7684\u60c5\u6cc1\u4e0b\u624d\u6703\u57f7\u884c\u3002\u9019\u4f7f\u5f97setnx\u975e\u5e38\u9069\u5408\u7528\u65bc\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\uff0c\u56e0\u70ba\u5b83\u53ef\u4ee5\u9632\u6b62\u591a\u500b\u9032\u7a0b\u540c\u6642\u7372\u53d6\u540c\u4e00\u8cc7\u6e90\u3002<\/p>\n<pre><code>SETNX key value\n<\/code><\/pre>\n<p>\u5982\u679c\u9375\u4e0d\u5b58\u5728\uff0csetnx\u5c07\u8fd4\u56de1\uff0c\u4e26\u8a2d\u7f6e\u9375\u7684\u503c\uff1b\u5982\u679c\u9375\u5df2\u5b58\u5728\uff0c\u5247\u8fd4\u56de0\uff0c\u4e26\u4e0d\u6703\u6539\u8b8a\u9375\u7684\u503c\u3002<\/p>\n<h2 id=\"%e7%b4%85%e8%89%b2%e5%8f%b2%e5%af%86%e6%96%af%ef%bc%88redisson%ef%bc%89%e7%b0%a1%e4%bb%8b-MjkRGQKWaz\">\u7d05\u8272\u53f2\u5bc6\u65af\uff08Redisson\uff09\u7c21\u4ecb<\/h2>\n<p>\u7d05\u8272\u53f2\u5bc6\u65af\uff08Redisson\uff09\u662f\u4e00\u500b\u57fa\u65bcRedis\u7684Java\u5ba2\u6236\u7aef\uff0c\u63d0\u4f9b\u4e86\u8a31\u591a\u9ad8\u7d1a\u529f\u80fd\uff0c\u5305\u62ec\u5206\u4f48\u5f0f\u9396\u3001\u5206\u4f48\u5f0f\u96c6\u5408\u3001\u5206\u4f48\u5f0f\u968a\u5217\u7b49\u3002\u5b83\u4f7f\u5f97\u958b\u767c\u8005\u80fd\u5920\u66f4\u8f15\u9b06\u5730\u69cb\u5efa\u5206\u4f48\u5f0f\u61c9\u7528\u7a0b\u5e8f\uff0c\u4e26\u4e14\u63d0\u4f9b\u4e86\u5c0dRedis\u7684\u9ad8\u6548\u8a2a\u554f\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8setnx%e5%af%a6%e7%8f%be%e5%88%86%e4%bd%88%e5%bc%8f%e9%8e%96-MjkRGQKWaz\">\u4f7f\u7528setnx\u5be6\u73fe\u5206\u4f48\u5f0f\u9396<\/h2>\n<p>\u5728\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u78ba\u4fdd\u8cc7\u6e90\u7684\u4e92\u65a5\u8a2a\u554f\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u4f7f\u7528setnx\u547d\u4ee4\u53ef\u4ee5\u8f15\u9b06\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528Redisson\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>import org.redisson.Redisson;\nimport org.redisson.api.RedissonClient;\nimport org.redisson.api.RLock;\nimport org.redisson.config.Config;\n\npublic class DistributedLockExample {\n    public static void main(String[] args) {\n        Config config = new Config();\n        config.useSingleServer().setAddress(\"redis:\/\/127.0.0.1:6379\");\n        RedissonClient redisson = Redisson.create(config);\n\n        RLock lock = redisson.getLock(\"myLock\");\n        try {\n            \/\/ \u5617\u8a66\u7372\u53d6\u9396\n            lock.lock();\n            \/\/ \u57f7\u884c\u9700\u8981\u4e92\u65a5\u8a2a\u554f\u7684\u64cd\u4f5c\n            System.out.println(\"\u7372\u53d6\u9396\u6210\u529f\uff0c\u57f7\u884c\u64cd\u4f5c...\");\n        } finally {\n            \/\/ \u91cb\u653e\u9396\n            lock.unlock();\n        }\n    }\n}\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u9996\u5148\u5275\u5efa\u4e86\u4e00\u500bRedissonClient\u5be6\u4f8b\uff0c\u7136\u5f8c\u7372\u53d6\u4e86\u4e00\u500b\u540d\u70ba\u201cmyLock\u201d\u7684\u9396\u3002\u901a\u904e\u8abf\u7528lock()\u65b9\u6cd5\uff0c\u6211\u5011\u5617\u8a66\u7372\u53d6\u9396\uff0c\u4e26\u5728finally\u584a\u4e2d\u91cb\u653e\u9396\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5373\u4f7f\u5728\u64cd\u4f5c\u904e\u7a0b\u4e2d\u767c\u751f\u7570\u5e38\uff0c\u9396\u4e5f\u80fd\u88ab\u6b63\u78ba\u91cb\u653e\u3002<\/p>\n<h2 id=\"setnx%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-MjkRGQKWaz\">setnx\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<ul>\n<li><strong>\u5206\u4f48\u5f0f\u9396\uff1a<\/strong>\u5982\u4e0a\u6240\u8ff0\uff0csetnx\u53ef\u4ee5\u7528\u65bc\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\uff0c\u78ba\u4fdd\u591a\u500b\u9032\u7a0b\u4e0d\u6703\u540c\u6642\u8a2a\u554f\u540c\u4e00\u8cc7\u6e90\u3002<\/li>\n<li><strong>\u9650\u6d41\uff1a<\/strong>\u5728\u9ad8\u6d41\u91cf\u7684\u61c9\u7528\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528setnx\u4f86\u9650\u5236\u67d0\u4e9b\u64cd\u4f5c\u7684\u983b\u7387\uff0c\u9632\u6b62\u7cfb\u7d71\u904e\u8f09\u3002<\/li>\n<li><strong>\u4efb\u52d9\u8abf\u5ea6\uff1a<\/strong>\u5728\u5206\u4f48\u5f0f\u4efb\u52d9\u8abf\u5ea6\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528setnx\u4f86\u78ba\u4fdd\u67d0\u500b\u4efb\u52d9\u53ea\u88ab\u4e00\u500b\u5be6\u4f8b\u57f7\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-MjkRGQKWaz\">\u7e3d\u7d50<\/h2>\n<p>setnx\u547d\u4ee4\u5728Redis\u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u7279\u5225\u662f\u5728\u69cb\u5efa\u5206\u4f48\u5f0f\u7cfb\u7d71\u6642\u3002\u901a\u904e\u4f7f\u7528\u7d05\u8272\u53f2\u5bc6\u65af\uff08Redisson\uff09\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\u548c\u5176\u4ed6\u9ad8\u7d1a\u529f\u80fd\uff0c\u5f9e\u800c\u63d0\u9ad8\u61c9\u7528\u7684\u53ef\u9760\u6027\u548c\u6027\u80fd\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u90e8\u7f72\u60a8\u7684Redis\u96c6\u7fa3\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u7a69\u5b9a\u7684\u57fa\u790e\u8a2d\u65bd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u7d05\u8272\u53f2\u5bc6\u65af\u5982\u4f55\u5728Redis\u96c6\u7fa3\u4e2d\u69cb\u5efa\u5206\u4f48\u5f0f\u96c6\u7fa3\u7684setnx\uff0c\u5be6\u73fe\u9ad8\u6548\u7684\u6578\u64da\u9396\u5b9a\u8207\u7ba1\u7406\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-159691","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/159691","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=159691"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/159691\/revisions"}],"predecessor-version":[{"id":159692,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/159691\/revisions\/159692"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=159691"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=159691"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=159691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}