{"id":206482,"date":"2025-06-12T13:21:00","date_gmt":"2025-06-12T05:21:00","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206482\/"},"modified":"2025-06-12T13:21:00","modified_gmt":"2025-06-12T05:21:00","slug":"singleflight-%e5%ba%93%e4%bc%98%e5%8c%96%e5%b9%b6%e5%8f%91%e6%95%b0%e6%8d%ae%e8%8e%b7%e5%8f%96%ef%bc%8c%e4%b8%ba%e4%bd%95%e4%bb%8d%e6%9c%89%e9%83%a8%e5%88%86%e8%af%b7%e6%b1%82%e9%87%8d%e5%a4%8d","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206482\/","title":{"rendered":"## singleflight \u5e93\u4f18\u5316\u5e76\u53d1\u6570\u636e\u83b7\u53d6\uff0c\u4e3a\u4f55\u4ecd\u6709\u90e8\u5206\u8bf7\u6c42\u91cd\u590d\u8bbf\u95ee\u6570\u636e\u5e93\uff1f"},"content":{"rendered":"<p>\u4eca\u5929GOLANG\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a## singleflight \u5e93\u4f18\u5316\u5e76\u53d1\u6570\u636e\u83b7\u53d6\uff0c\u4e3a\u4f55\u4ecd\u6709\u90e8\u5206\u8bf7\u6c42\u91cd\u590d\u8bbf\u95ee\u6570\u636e\u5e93\uff1f\u300b<\/span>\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u70b9\u5305\u62ec<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\uff0c\u65e0\u8bba\u4f60\u662f\u5c0f\u767d\u8fd8\u662f\u8001\u624b\uff0c\u90fd\u9002\u5408\u770b\u4e00\u770b\u54e6~\u6709\u597d\u7684\u5efa\u8bae\u4e5f\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u82e5\u662f\u770b\u5b8c\u6709\u6240\u6536\u83b7\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u70b9\u8d5e\u652f\u6301\u5440\uff01\u4e00\u8d77\u52a0\u6cb9\u5b66\u4e60~,<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241113\/17314572916733f10bbbc46.jpg\" class=\"aligncenter\">,<br \/>\n<strong>singleflight \u5e93\u5e76\u53d1\u6570\u636e\u83b7\u53d6\u4f18\u5316\u95ee\u9898<\/strong>,\u5728\u5e76\u53d1\u573a\u666f\u4e0b\u83b7\u53d6\u6570\u636e\u65f6\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u4e2a\u8bf7\u6c42\u540c\u65f6\u8bbf\u95ee\u6570\u636e\u5e93\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u7684\u95ee\u9898\u3002singleflight \u5e93\u53ef\u4ee5\u7528\u6765\u907f\u514d\u5e76\u53d1\u8bf7\u6c42\u5bf9\u540c\u4e00\u6570\u636e\u7684\u91cd\u590d\u83b7\u53d6\uff0c\u63d0\u9ad8\u6027\u80fd\u3002,\u5728\u7ed9\u5b9a\u7684\u4ee3\u7801\u7247\u6bb5\u4e2d\uff0c\u4f7f\u7528 singleflight \u673a\u5236\u6765\u63a7\u5236\u5e76\u53d1\u6570\u636e\u83b7\u53d6\u3002\u4f46\u6267\u884c\u7ed3\u679c\u8868\u660e\uff0c\u4ecd\u6709\u90e8\u5206\u8bf7\u6c42\u540c\u65f6\u8bbf\u95ee\u4e86\u6570\u636e\u5e93\u3002,\u8fd9\u4e2a\u95ee\u9898\u7684\u539f\u56e0\u5728\u4e8e\uff0csingleflight \u53ea\u80fd\u786e\u4fdd\u5728<br \/>\n<strong>\u540c\u4e00\u65f6\u95f4<\/strong>\u6709\u591a\u4e2a\u534f\u7a0b\u8bbf\u95ee\u65f6\uff0c\u624d\u907f\u514d\u91cd\u590d\u83b7\u53d6\u3002\u800c\u5728\u4ee3\u7801\u4e2d\uff0cgetdatafromdb \u51fd\u6570\u6267\u884c\u5f88\u5feb\uff0c\u5b8c\u6210\u83b7\u53d6\u6570\u636e\u540e\u5c31\u7ed3\u675f\u4e86\u3002\u5982\u679c\u5176\u4ed6\u534f\u7a0b\u672a\u540c\u65f6\u6267\u884c getdatafromdb\uff0c\u5c31\u4f1a\u5bfc\u81f4\u90e8\u5206\u534f\u7a0b\u4ecd\u7136\u4f1a\u540c\u65f6\u8fdb\u5165\u5230 do \u51fd\u6570\u4e2d\u6267\u884c\u91cd\u590d\u83b7\u53d6\u3002,\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u9700\u8981\u786e\u4fdd\u6240\u6709\u9700\u8981\u6267\u884c getdatafromdb \u51fd\u6570\u7684\u534f\u7a0b\u5728\u540c\u4e00\u65f6\u95f4\u5f00\u59cb\u6267\u884c\u3002\u4e00\u79cd\u65b9\u6cd5\u662f\u5728 getdata \u51fd\u6570\u4e2d\u52a0\u5165\u5ef6\u8fdf\uff0c\u4f8b\u5982\uff1a,\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u5728\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u4e2a\u534f\u7a0b\u6267\u884c getdatafromdb \u51fd\u6570\uff0c\u4ece\u800c\u907f\u514d\u91cd\u590d\u83b7\u53d6\u6570\u636e\u3002,\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300a## singleflight \u5e93\u4f18\u5316\u5e76\u53d1\u6570\u636e\u83b7\u53d6\uff0c\u4e3a\u4f55\u4ecd\u6709\u90e8\u5206\u8bf7\u6c42\u91cd\u590d\u8bbf\u95ee\u6570\u636e\u5e93\uff1f\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591aGOLANG\u77e5\u8bc6\uff01,singleflight \u5e93\u5e76\u53d1\u6570\u636e\u83b7\u53d6\u4f18\u5316\u95ee\u9898,\u4eca\u5929GOLANG\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a## singleflight \u5e93\u4f18\u5316\u5e76\u53d1\u6570\u636e\u83b7\u53d6\uff0c\u4e3a\u4f55\u4ecd\u6709\u90e8\u5206\u8bf7\u6c42\u91cd\u590d\u8bbf\u95ee\u6570\u636e\u5e93\uff1f\u300b<\/span>\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u70b9\u5305\u62ec<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\uff0c\u65e0\u8bba\u4f60\u662f\u5c0f\u767d\u8fd8\u662f\u8001\u624b\uff0c\u90fd\u9002\u5408\u770b\u4e00\u770b\u54e6~\u6709\u597d\u7684\u5efa\u8bae\u4e5f\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u82e5\u662f\u770b\u5b8c\u6709\u6240\u6536\u83b7\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u70b9\u8d5e\u652f\u6301\u5440\uff01\u4e00\u8d77\u52a0\u6cb9\u5b66\u4e60~,<br \/>\n<b><\/b> <\/p>\n<p>\u5f53\u524d\u4f4d\u7f6e\uff1a <span>&gt;<\/span>  <span>&gt;<\/span>  <span>&gt;<\/span>  <span>&gt;<\/span> <span>## singleflight \u5e93\u4f18\u5316\u5e76\u53d1\u6570\u636e\u83b7\u53d6\uff0c\u4e3a\u4f55\u4ecd\u6709\u90e8\u5206\u8bf7\u6c42\u91cd\u590d\u8bbf\u95ee\u6570\u636e\u5e93\uff1f<\/span><\/p>\n<h1>## singleflight \u5e93\u4f18\u5316\u5e76\u53d1\u6570\u636e\u83b7\u53d6\uff0c\u4e3a\u4f55\u4ecd\u6709\u90e8\u5206\u8bf7\u6c42\u91cd\u590d\u8bbf\u95ee\u6570\u636e\u5e93\uff1f<\/h1>\n<p><span>2024-11-13 08:21:47<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u4eca\u5929GOLANG\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a## singleflight \u5e93\u4f18\u5316\u5e76\u53d1\u6570\u636e\u83b7\u53d6\uff0c\u4e3a\u4f55\u4ecd\u6709\u90e8\u5206\u8bf7\u6c42\u91cd\u590d\u8bbf\u95ee\u6570\u636e\u5e93\uff1f\u300b<\/span>\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u70b9\u5305\u62ec<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\uff0c\u65e0\u8bba\u4f60\u662f\u5c0f\u767d\u8fd8\u662f\u8001\u624b\uff0c\u90fd\u9002\u5408\u770b\u4e00\u770b\u54e6~\u6709\u597d\u7684\u5efa\u8bae\u4e5f\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u82e5\u662f\u770b\u5b8c\u6709\u6240\u6536\u83b7\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u70b9\u8d5e\u652f\u6301\u5440\uff01\u4e00\u8d77\u52a0\u6cb9\u5b66\u4e60~<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241113\/17314572916733f10bbbc46.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>singleflight \u5e93\u5e76\u53d1\u6570\u636e\u83b7\u53d6\u4f18\u5316\u95ee\u9898<\/strong><\/p>\n<p>\u5728\u5e76\u53d1\u573a\u666f\u4e0b\u83b7\u53d6\u6570\u636e\u65f6\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u4e2a\u8bf7\u6c42\u540c\u65f6\u8bbf\u95ee\u6570\u636e\u5e93\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u7684\u95ee\u9898\u3002singleflight \u5e93\u53ef\u4ee5\u7528\u6765\u907f\u514d\u5e76\u53d1\u8bf7\u6c42\u5bf9\u540c\u4e00\u6570\u636e\u7684\u91cd\u590d\u83b7\u53d6\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<p>\u5728\u7ed9\u5b9a\u7684\u4ee3\u7801\u7247\u6bb5\u4e2d\uff0c\u4f7f\u7528 singleflight \u673a\u5236\u6765\u63a7\u5236\u5e76\u53d1\u6570\u636e\u83b7\u53d6\u3002\u4f46\u6267\u884c\u7ed3\u679c\u8868\u660e\uff0c\u4ecd\u6709\u90e8\u5206\u8bf7\u6c42\u540c\u65f6\u8bbf\u95ee\u4e86\u6570\u636e\u5e93\u3002<\/p>\n<p>\u8fd9\u4e2a\u95ee\u9898\u7684\u539f\u56e0\u5728\u4e8e\uff0csingleflight \u53ea\u80fd\u786e\u4fdd\u5728<strong>\u540c\u4e00\u65f6\u95f4<\/strong>\u6709\u591a\u4e2a\u534f\u7a0b\u8bbf\u95ee\u65f6\uff0c\u624d\u907f\u514d\u91cd\u590d\u83b7\u53d6\u3002\u800c\u5728\u4ee3\u7801\u4e2d\uff0cgetdatafromdb \u51fd\u6570\u6267\u884c\u5f88\u5feb\uff0c\u5b8c\u6210\u83b7\u53d6\u6570\u636e\u540e\u5c31\u7ed3\u675f\u4e86\u3002\u5982\u679c\u5176\u4ed6\u534f\u7a0b\u672a\u540c\u65f6\u6267\u884c getdatafromdb\uff0c\u5c31\u4f1a\u5bfc\u81f4\u90e8\u5206\u534f\u7a0b\u4ecd\u7136\u4f1a\u540c\u65f6\u8fdb\u5165\u5230 do \u51fd\u6570\u4e2d\u6267\u884c\u91cd\u590d\u83b7\u53d6\u3002<\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u9700\u8981\u786e\u4fdd\u6240\u6709\u9700\u8981\u6267\u884c getdatafromdb \u51fd\u6570\u7684\u534f\u7a0b\u5728\u540c\u4e00\u65f6\u95f4\u5f00\u59cb\u6267\u884c\u3002\u4e00\u79cd\u65b9\u6cd5\u662f\u5728 getdata \u51fd\u6570\u4e2d\u52a0\u5165\u5ef6\u8fdf\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>func getDataFromDB(key string) (string, error) {\n    log.Printf(\"get %s from database\", key)\n    time.Sleep(time.Millisecond * 500) \/\/ \u5ef6\u8fdf 500 \u6beb\u79d2\n    return \"data\", nil\n}<\/pre>\n<p>\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u5728\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u4e2a\u534f\u7a0b\u6267\u884c getdatafromdb \u51fd\u6570\uff0c\u4ece\u800c\u907f\u514d\u91cd\u590d\u83b7\u53d6\u6570\u636e\u3002<\/p>\n<p>\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300a## singleflight \u5e93\u4f18\u5316\u5e76\u53d1\u6570\u636e\u83b7\u53d6\uff0c\u4e3a\u4f55\u4ecd\u6709\u90e8\u5206\u8bf7\u6c42\u91cd\u590d\u8bbf\u95ee\u6570\u636e\u5e93\uff1f\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591aGOLANG\u77e5\u8bc6\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<dd>\n   Go \u8bed\u8a00\u4e2d var a[2][]int \u8fd9\u79cd\u5d4c\u5957\u7ed3\u6784\u7684\u7c7b\u578b\u662f\u4ec0\u4e48\uff1f\n <\/dd>\n<\/dl>\n<dl>\n<dt>\n <\/dt>\n<dd>\n   \u56de\u8868\u67e5\u8be2\u4e3a\u4ec0\u4e48\u662f\u968f\u673a I\/O\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u5929GOLANG\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86 \u300a&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-206482","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206482","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=206482"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206482\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=206482"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=206482"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=206482"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}