{"id":161247,"date":"2024-11-04T04:50:22","date_gmt":"2024-11-03T20:50:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/161247\/"},"modified":"2024-11-04T04:50:23","modified_gmt":"2024-11-03T20:50:23","slug":"%e5%9f%ba%e6%96%bc-redis-%e7%9a%84-setnx-%e9%8e%96%e5%af%a6%e7%8f%be%e7%b0%a1%e6%98%93%e5%88%86%e5%b8%83%e5%bc%8f%e9%8e%96%ef%bc%88redis-%e9%8e%96-setnx%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/161247\/","title":{"rendered":"\u57fa\u65bc Redis \u7684 setnx \u9396\u5be6\u73fe\u7c21\u6613\u5206\u5e03\u5f0f\u9396\uff08redis \u9396 setnx\uff09"},"content":{"rendered":"<h1 id=\"%e5%9f%ba%e6%96%bc-redis-%e7%9a%84-setnx-%e9%8e%96%e5%af%a6%e7%8f%be%e7%b0%a1%e6%98%93%e5%88%86%e5%b8%83%e5%bc%8f%e9%8e%96%ef%bc%88redis-%e9%8e%96-setnx%ef%bc%89-liXNEMHzyS\">\u57fa\u65bc Redis \u7684 setnx \u9396\u5be6\u73fe\u7c21\u6613\u5206\u5e03\u5f0f\u9396\uff08redis \u9396 setnx\uff09<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u5206\u5e03\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u8cc7\u6e90\u7684\u7af6\u722d\u548c\u5354\u8abf\u662f\u4e00\u500b\u91cd\u8981\u7684\u6311\u6230\u3002\u70ba\u4e86\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0c\u5206\u5e03\u5f0f\u9396\u7684\u6982\u5ff5\u61c9\u904b\u800c\u751f\u3002Redis \u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u6578\u64da\u5eab\uff0c\u63d0\u4f9b\u4e86\u7c21\u55ae\u800c\u6709\u6548\u7684\u65b9\u5f0f\u4f86\u5be6\u73fe\u5206\u5e03\u5f0f\u9396\uff0c\u5176\u4e2d setnx \u547d\u4ee4\u662f\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u4e4b\u4e00\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-setnx%ef%bc%9f-liXNEMHzyS\">\u4ec0\u9ebc\u662f setnx\uff1f<\/h2>\n<p>setnx \u662f Redis \u4e2d\u7684\u4e00\u500b\u547d\u4ee4\uff0c\u5168\u540d\u70ba &#8220;SET if Not eXists&#8221;\u3002\u9019\u500b\u547d\u4ee4\u7684\u4f5c\u7528\u662f\uff1a\u5982\u679c\u6307\u5b9a\u7684\u9375\u4e0d\u5b58\u5728\uff0c\u5247\u8a2d\u7f6e\u9375\u7684\u503c\u4e26\u8fd4\u56de 1\uff1b\u5982\u679c\u9375\u5df2\u5b58\u5728\uff0c\u5247\u4e0d\u9032\u884c\u4efb\u4f55\u64cd\u4f5c\u4e26\u8fd4\u56de 0\u3002\u9019\u4e00\u7279\u6027\u4f7f\u5f97 setnx \u6210\u70ba\u5be6\u73fe\u5206\u5e03\u5f0f\u9396\u7684\u7406\u60f3\u9078\u64c7\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e5%88%86%e5%b8%83%e5%bc%8f%e9%8e%96%ef%bc%9f-liXNEMHzyS\">\u70ba\u4ec0\u9ebc\u9700\u8981\u5206\u5e03\u5f0f\u9396\uff1f<\/h2>\n<p>\u5728\u5206\u5e03\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u7576\u591a\u500b\u5be6\u4f8b\u540c\u6642\u8a2a\u554f\u5171\u4eab\u8cc7\u6e90\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u6216\u7af6\u722d\u689d\u4ef6\u3002\u5206\u5e03\u5f0f\u9396\u53ef\u4ee5\u78ba\u4fdd\u5728\u540c\u4e00\u6642\u9593\u5167\u53ea\u6709\u4e00\u500b\u5be6\u4f8b\u80fd\u5920\u8a2a\u554f\u7279\u5b9a\u7684\u8cc7\u6e90\uff0c\u5f9e\u800c\u907f\u514d\u9019\u4e9b\u554f\u984c\u3002\u4f7f\u7528 Redis \u5be6\u73fe\u7684\u5206\u5e03\u5f0f\u9396\u5177\u6709\u9ad8\u6548\u3001\u7c21\u55ae\u548c\u53ef\u64f4\u5c55\u7684\u7279\u9ede\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-setnx-%e5%af%a6%e7%8f%be%e5%88%86%e5%b8%83%e5%bc%8f%e9%8e%96-liXNEMHzyS\">\u5982\u4f55\u4f7f\u7528 setnx \u5be6\u73fe\u5206\u5e03\u5f0f\u9396<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4f7f\u7528 Redis \u7684 setnx \u547d\u4ee4\u5be6\u73fe\u7c21\u6613\u5206\u5e03\u5f0f\u9396\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<pre><code>1. \u5617\u8a66\u7372\u53d6\u9396\uff1a\n   \u4f7f\u7528 setnx \u547d\u4ee4\u8a2d\u7f6e\u4e00\u500b\u9396\u9375\uff08\u4f8b\u5982 \"lock:key\"\uff09\uff0c\u5982\u679c\u8fd4\u56de\u503c\u70ba 1\uff0c\u5247\u8868\u793a\u7372\u53d6\u9396\u6210\u529f\u3002\n\n2. \u8a2d\u7f6e\u9396\u7684\u904e\u671f\u6642\u9593\uff1a\n   \u70ba\u4e86\u9632\u6b62\u6b7b\u9396\uff0c\u61c9\u8a72\u70ba\u9396\u8a2d\u7f6e\u4e00\u500b\u904e\u671f\u6642\u9593\u3002\u53ef\u4ee5\u4f7f\u7528 EXPIRE \u547d\u4ee4\u4f86\u8a2d\u7f6e\u3002\n\n3. \u57f7\u884c\u81e8\u754c\u5340\u4ee3\u78bc\uff1a\n   \u5728\u7372\u53d6\u9396\u5f8c\uff0c\u57f7\u884c\u9700\u8981\u4fdd\u8b77\u7684\u4ee3\u78bc\u3002\n\n4. \u91cb\u653e\u9396\uff1a\n   \u4f7f\u7528 DEL \u547d\u4ee4\u522a\u9664\u9396\u9375\uff0c\u91cb\u653e\u9396\u3002<\/code><\/pre>\n<h3 id=\"%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a2%bc-liXNEMHzyS\">\u793a\u4f8b\u4ee3\u78bc<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684 Python \u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528 Redis \u7684 setnx \u547d\u4ee4\u4f86\u5be6\u73fe\u5206\u5e03\u5f0f\u9396\uff1a<\/p>\n<pre><code>import redis\nimport time\n\n# \u9023\u63a5\u5230 Redis\nr = redis.StrictRedis(host='localhost', port=6379, db=0)\n\ndef acquire_lock(lock_name, acquire_time=10):\n    identifier = str(uuid.uuid4())\n    end = time.time() + acquire_time\n    while time.time() &lt; end:\n        if r.setnx(lock_name, identifier):\n            r.expire(lock_name, acquire_time)\n            return identifier\n        time.sleep(0.001)  # \u7b49\u5f85\u4e00\u6bb5\u6642\u9593\u518d\u91cd\u8a66\n    return False\n\ndef release_lock(lock_name, identifier):\n    if r.get(lock_name) == identifier:\n        r.delete(lock_name)\n\n# \u4f7f\u7528\u9396\nlock_name = \"lock:key\"\nidentifier = acquire_lock(lock_name)\nif identifier:\n    try:\n        # \u57f7\u884c\u81e8\u754c\u5340\u4ee3\u78bc\n        print(\"\u7372\u53d6\u9396\u6210\u529f\uff0c\u57f7\u884c\u4ee3\u78bc\")\n    finally:\n        release_lock(lock_name, identifier)\nelse:\n    print(\"\u7372\u53d6\u9396\u5931\u6557\")<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-liXNEMHzyS\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u9396\u7684\u904e\u671f\u6642\u9593\uff1a<\/strong>\u8a2d\u7f6e\u5408\u7406\u7684\u904e\u671f\u6642\u9593\uff0c\u4ee5\u9632\u6b62\u6b7b\u9396\u3002<\/li>\n<li><strong>\u9396\u7684\u552f\u4e00\u6027\uff1a<\/strong>\u78ba\u4fdd\u6bcf\u500b\u9396\u7684\u552f\u4e00\u6027\uff0c\u901a\u5e38\u53ef\u4ee5\u4f7f\u7528 UUID \u4f5c\u70ba\u9396\u7684\u6a19\u8b58\u3002<\/li>\n<li><strong>\u932f\u8aa4\u8655\u7406\uff1a<\/strong>\u5728\u91cb\u653e\u9396\u6642\uff0c\u61c9\u6aa2\u67e5\u7576\u524d\u9396\u7684\u64c1\u6709\u8005\uff0c\u4ee5\u907f\u514d\u8aa4\u522a\u9664\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-liXNEMHzyS\">\u7e3d\u7d50<\/h2>\n<p>\u57fa\u65bc Redis \u7684 setnx \u9396\u5be6\u73fe\u7c21\u6613\u5206\u5e03\u5f0f\u9396\u662f\u4e00\u7a2e\u9ad8\u6548\u4e14\u7c21\u55ae\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u9069\u7528\u65bc\u591a\u7a2e\u5206\u5e03\u5f0f\u7cfb\u7d71\u5834\u666f\u3002\u901a\u904e\u5408\u7406\u8a2d\u7f6e\u9396\u7684\u904e\u671f\u6642\u9593\u548c\u552f\u4e00\u6027\uff0c\u53ef\u4ee5\u6709\u6548\u907f\u514d\u8cc7\u6e90\u7af6\u722d\u548c\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u53ef\u7528\u6027\u548c\u9ad8\u6027\u80fd\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u5c07\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u57fa\u65bc Redis \u7684 setnx \u9396\u5be6\u73fe\u7c21\u6613\u5206\u5e03\u5f0f\u9396\uff0c\u63d0\u5347\u7cfb\u7d71\u7a69\u5b9a\u6027\u8207\u4e26\u767c\u63a7\u5236\uff0c\u78ba\u4fdd\u8cc7\u6e90\u5b89\u5168\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-161247","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/161247","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=161247"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/161247\/revisions"}],"predecessor-version":[{"id":161248,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/161247\/revisions\/161248"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=161247"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=161247"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=161247"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}