{"id":161237,"date":"2024-11-04T04:45:24","date_gmt":"2024-11-03T20:45:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/161237\/"},"modified":"2024-11-04T04:45:25","modified_gmt":"2024-11-03T20:45:25","slug":"%e5%9f%ba%e6%96%bc-redis-%e7%9a%84-cas-%e5%ae%89%e5%85%a8%e6%8e%a7%e5%88%b6%e6%96%b9%e6%a1%88%ef%bc%88redis-%e7%9a%84-cas-%e6%96%b9%e6%a1%88%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/161237\/","title":{"rendered":"\u57fa\u65bc Redis \u7684 CAS \u5b89\u5168\u63a7\u5236\u65b9\u6848\uff08redis \u7684 cas \u65b9\u6848\uff09"},"content":{"rendered":"<h1 id=\"%e5%9f%ba%e6%96%bc-redis-%e7%9a%84-cas-%e5%ae%89%e5%85%a8%e6%8e%a7%e5%88%b6%e6%96%b9%e6%a1%88%ef%bc%88redis-%e7%9a%84-cas-%e6%96%b9%e6%a1%88%ef%bc%89-bpkfiQWneC\">\u57fa\u65bc Redis \u7684 CAS \u5b89\u5168\u63a7\u5236\u65b9\u6848\uff08redis \u7684 cas \u65b9\u6848\uff09<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u4e00\u81f4\u6027\u548c\u5b89\u5168\u6027\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u96a8\u8457\u61c9\u7528\u7a0b\u5e8f\u7684\u589e\u9577\uff0c\u5982\u4f55\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u7684\u4e26\u767c\u8a2a\u554f\u6210\u70ba\u4e86\u4e00\u500b\u6311\u6230\u3002\u9019\u6642\uff0c\u57fa\u65bc Redis \u7684 CAS\uff08Compare and Swap\uff09\u5b89\u5168\u63a7\u5236\u65b9\u6848\u4fbf\u6210\u70ba\u4e86\u4e00\u7a2e\u6709\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e Redis \u7684 CAS \u65b9\u6848\u53ca\u5176\u5728\u5b89\u5168\u63a7\u5236\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-cas%ef%bc%9f-bpkfiQWneC\">\u4ec0\u9ebc\u662f CAS\uff1f<\/h2>\n<p>CAS\uff08Compare and Swap\uff09\u662f\u4e00\u7a2e\u539f\u5b50\u64cd\u4f5c\uff0c\u901a\u5e38\u7528\u65bc\u5be6\u73fe\u591a\u7dda\u7a0b\u74b0\u5883\u4e2d\u7684\u6578\u64da\u4e00\u81f4\u6027\u3002\u5b83\u7684\u57fa\u672c\u539f\u7406\u662f\uff1a\u5728\u66f4\u65b0\u6578\u64da\u4e4b\u524d\uff0c\u5148\u6aa2\u67e5\u7576\u524d\u503c\u662f\u5426\u8207\u9810\u671f\u503c\u76f8\u540c\u3002\u5982\u679c\u76f8\u540c\uff0c\u5247\u9032\u884c\u66f4\u65b0\uff1b\u5982\u679c\u4e0d\u540c\uff0c\u5247\u4e0d\u9032\u884c\u66f4\u65b0\u3002\u9019\u6a23\u53ef\u4ee5\u6709\u6548\u907f\u514d\u6578\u64da\u7af6\u722d\u548c\u4e0d\u4e00\u81f4\u7684\u60c5\u6cc1\u3002<\/p>\n<h2 id=\"redis-%e4%b8%ad%e7%9a%84-cas-%e5%af%a6%e7%8f%be-bpkfiQWneC\">Redis \u4e2d\u7684 CAS \u5be6\u73fe<\/h2>\n<p>Redis \u662f\u4e00\u500b\u9ad8\u6027\u80fd\u7684\u9375\u503c\u6578\u64da\u5eab\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u7de9\u5b58\u3001\u6d88\u606f\u968a\u5217\u7b49\u5834\u666f\u3002Redis \u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u64da\u7d50\u69cb\u548c\u64cd\u4f5c\uff0c\u652f\u6301\u9ad8\u6548\u7684 CAS \u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 Redis \u5be6\u73fe CAS \u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<pre><code>SET key value NX EX seconds\n<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c`SET` \u547d\u4ee4\u7684 `NX` \u53c3\u6578\u8868\u793a\u53ea\u6709\u7576\u9375\u4e0d\u5b58\u5728\u6642\u624d\u6703\u8a2d\u7f6e\u9375\u7684\u503c\uff0c\u800c `EX` \u53c3\u6578\u5247\u8a2d\u7f6e\u9375\u7684\u904e\u671f\u6642\u9593\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5728\u9ad8\u4f75\u767c\u7684\u60c5\u6cc1\u4e0b\uff0c\u53ea\u6709\u4e00\u500b\u8acb\u6c42\u80fd\u5920\u6210\u529f\u8a2d\u7f6e\u9375\u7684\u503c\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a2%bc-bpkfiQWneC\">\u793a\u4f8b\u4ee3\u78bc<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 Redis \u5be6\u73fe CAS \u7684\u7c21\u55ae\u793a\u4f8b\uff1a<\/p>\n<pre><code>import redis\n\n# \u9023\u63a5\u5230 Redis\nr = redis.StrictRedis(host='localhost', port=6379, db=0)\n\n# \u5b9a\u7fa9\u9375\u548c\u503c\nkey = 'my_key'\nexpected_value = 'old_value'\nnew_value = 'new_value'\n\n# \u7372\u53d6\u7576\u524d\u503c\ncurrent_value = r.get(key)\n\n# \u6bd4\u8f03\u4e26\u4ea4\u63db\nif current_value == expected_value.encode('utf-8'):\n    r.set(key, new_value)\n    print(\"\u66f4\u65b0\u6210\u529f\")\nelse:\n    print(\"\u66f4\u65b0\u5931\u6557\uff0c\u7576\u524d\u503c\u4e0d\u5339\u914d\")\n<\/code><\/pre>\n<h2 id=\"cas-%e7%9a%84%e5%84%aa%e5%8b%a2-bpkfiQWneC\">CAS \u7684\u512a\u52e2<\/h2>\n<ul>\n<li><strong>\u539f\u5b50\u6027\uff1a<\/strong>CAS \u64cd\u4f5c\u662f\u539f\u5b50\u6027\u7684\uff0c\u9019\u610f\u5473\u8457\u5728\u591a\u7dda\u7a0b\u74b0\u5883\u4e2d\uff0c\u6578\u64da\u7684\u4e00\u81f4\u6027\u5f97\u5230\u4e86\u4fdd\u8b49\u3002<\/li>\n<li><strong>\u6027\u80fd\u9ad8\uff1a<\/strong>\u7531\u65bc Redis \u662f\u57fa\u65bc\u5167\u5b58\u7684\u6578\u64da\u5eab\uff0cCAS \u64cd\u4f5c\u7684\u6027\u80fd\u975e\u5e38\u9ad8\uff0c\u9069\u5408\u9ad8\u4f75\u767c\u5834\u666f\u3002<\/li>\n<li><strong>\u7c21\u55ae\u6613\u7528\uff1a<\/strong>Redis \u63d0\u4f9b\u4e86\u7c21\u55ae\u7684\u547d\u4ee4\u4f86\u5be6\u73fe CAS\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u4e0a\u624b\u3002<\/li>\n<\/ul>\n<h2 id=\"cas-%e7%9a%84%e6%8c%91%e6%88%b0-bpkfiQWneC\">CAS \u7684\u6311\u6230<\/h2>\n<p>\u5118\u7ba1 CAS \u6709\u8a31\u591a\u512a\u52e2\uff0c\u4f46\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u4e5f\u9762\u81e8\u4e00\u4e9b\u6311\u6230\uff1a<\/p>\n<ul>\n<li><strong>\u81ea\u65cb\u9396\u554f\u984c\uff1a<\/strong>\u5728\u9ad8\u4f75\u767c\u7684\u60c5\u6cc1\u4e0b\uff0cCAS \u53ef\u80fd\u6703\u5c0e\u81f4\u81ea\u65cb\u9396\uff0c\u5f9e\u800c\u5f71\u97ff\u6027\u80fd\u3002<\/li>\n<li><strong>\u5931\u6557\u91cd\u8a66\uff1a<\/strong>\u5982\u679c CAS \u64cd\u4f5c\u5931\u6557\uff0c\u5247\u9700\u8981\u91cd\u65b0\u5617\u8a66\uff0c\u9019\u53ef\u80fd\u6703\u589e\u52a0\u7cfb\u7d71\u7684\u8ca0\u64d4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-bpkfiQWneC\">\u7d50\u8ad6<\/h2>\n<p>\u57fa\u65bc Redis \u7684 CAS \u5b89\u5168\u63a7\u5236\u65b9\u6848\u70ba\u89e3\u6c7a\u6578\u64da\u4e00\u81f4\u6027\u554f\u984c\u63d0\u4f9b\u4e86\u4e00\u7a2e\u6709\u6548\u7684\u624b\u6bb5\u3002\u901a\u904e\u539f\u5b50\u64cd\u4f5c\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5728\u9ad8\u4f75\u767c\u74b0\u5883\u4e2d\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u4e00\u81f4\u6027\u3002\u7136\u800c\uff0c\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u958b\u767c\u8005\u4e5f\u9700\u8981\u8003\u616e\u5230 CAS \u7684\u6311\u6230\uff0c\u4e26\u6839\u64da\u5177\u9ad4\u60c5\u6cc1\u9078\u64c7\u5408\u9069\u7684\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u9084\u662f\u5176\u4ed6\u96f2\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u57fa\u65bc Redis \u7684 CAS \u5b89\u5168\u63a7\u5236\u65b9\u6848\uff0c\u63d0\u5347\u6578\u64da\u4e00\u81f4\u6027\u8207\u5b89\u5168\u6027\uff0c\u78ba\u4fdd\u9ad8\u6548\u7684\u4e26\u767c\u64cd\u4f5c\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-161237","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/161237","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=161237"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/161237\/revisions"}],"predecessor-version":[{"id":161238,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/161237\/revisions\/161238"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=161237"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=161237"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=161237"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}