{"id":205963,"date":"2025-06-12T08:30:50","date_gmt":"2025-06-12T00:30:50","guid":{"rendered":"https:\/\/server.hk\/cnblog\/205963\/"},"modified":"2025-06-12T08:30:50","modified_gmt":"2025-06-12T00:30:50","slug":"go-%e4%b8%ad%e7%9a%84-singleflight-%e5%ba%93%e5%a6%82%e4%bd%95%e6%9c%89%e6%95%88%e6%8e%a7%e5%88%b6%e5%b9%b6%e5%8f%91%e8%af%b7%e6%b1%82%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/205963\/","title":{"rendered":"## Go \u4e2d\u7684 singleflight \u5e93\u5982\u4f55\u6709\u6548\u63a7\u5236\u5e76\u53d1\u8bf7\u6c42\uff1f"},"content":{"rendered":"

\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587
\n\u300a## Go \u4e2d\u7684 singleflight \u5e93\u5982\u4f55\u6709\u6548\u63a7\u5236\u5e76\u53d1\u8bf7\u6c42\uff1f\u300b<\/span>\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230
\n<\/span>\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60
\nGOLANG<\/span>\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a
\nGOLANG<\/span>\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~,
\n,
\n\u5982\u4f55\u5728 go \u4e2d\u4f7f\u7528 singleflight \u5e93\u907f\u514d\u5e76\u53d1\u6570\u636e\u8bbf\u95ee<\/strong>,\u5728\u5e76\u53d1\u573a\u666f\u4e2d\uff0c\u591a\u4e2a\u5ba2\u6237\u7aef\u540c\u65f6\u8bf7\u6c42\u540c\u4e00\u4e2a\u6570\u636e\u65f6\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u5e93\u6216\u7f13\u5b58\u7684\u8bbf\u95ee\u91cf\u6fc0\u589e\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0cgo \u8bed\u8a00\u63d0\u4f9b\u4e86 singleflight \u5e93\u6765\u63a7\u5236\u5e76\u53d1\u7684\u8bf7\u6c42\u3002,
\n\u95ee\u9898\u63cf\u8ff0<\/strong>,\u5728\u4ee5\u4e0b\u4ee3\u7801\u4e2d\uff0c\u5e76\u53d1\u83b7\u53d6\u6570\u636e\u65f6\u51fa\u73b0\u591a\u4e2a\u8bf7\u6c42\u8bbf\u95ee\u6570\u636e\u5e93\uff1a,
\n\u7b54\u6848<\/strong>,\u5728\u5e76\u53d1\u573a\u666f\u4e2d\uff0csingleflight \u5e93\u901a\u8fc7 do \u65b9\u6cd5\u6709\u6548\u5730\u9650\u5236\u5e76\u53d1\u8bf7\u6c42\u3002\u4f46\u662f\uff0c\u4e3a\u4e86\u786e\u4fdd\u6240\u6709\u5e76\u53d1\u8bf7\u6c42\u90fd\u88ab\u9650\u5236\uff0c\u9700\u8981\u6ee1\u8db3\u4ee5\u4e0b\u6761\u4ef6\uff1a,\u6587\u7ae0\u63d0\u4f9b\u7684\u4ee3\u7801\u793a\u4f8b\u4e2d\uff0cgetdatafromdb \u65b9\u6cd5\u4ec5\u6253\u5370\u6d88\u606f\u5e76\u7acb\u5373\u8fd4\u56de\uff0c\u5bfc\u81f4\u5e76\u53d1\u8bf7\u6c42\u65e0\u6cd5\u540c\u65f6\u8fdb\u5165 do \u65b9\u6cd5\u3002\u56e0\u6b64\uff0csingleflight \u5e93\u6ca1\u6709\u53d1\u6325\u5e94\u6709\u7684\u4f5c\u7528\uff0c\u5bfc\u81f4\u591a\u4e2a\u8bf7\u6c42\u8bbf\u95ee\u6570\u636e\u5e93\u3002,\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u53ef\u4ee5\u4f7f\u7528 time.sleep \u51fd\u6570\u5ef6\u8fdf getdatafromdb \u65b9\u6cd5\u4e2d\u7684\u64cd\u4f5c\uff0c\u4ece\u800c\u4fdd\u8bc1\u5e76\u53d1\u8bf7\u6c42\u80fd\u591f\u540c\u65f6\u5230\u8fbe do \u65b9\u6cd5\u3002\u4f8b\u5982\uff1a,\u901a\u8fc7\u8fd9\u79cd\u65b9\u6cd5\uff0csingleflight \u5e93\u53ef\u4ee5\u6709\u6548\u5730\u63a7\u5236\u5e76\u53d1\u8bf7\u6c42\uff0c\u907f\u514d\u6570\u636e\u5e93\u6216\u7f13\u5b58\u7684\u8bbf\u95ee\u91cf\u6fc0\u589e\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u6027\u80fd\u3002,\u4eca\u5929\u5173\u4e8e\u300a## Go \u4e2d\u7684 singleflight \u5e93\u5982\u4f55\u6709\u6548\u63a7\u5236\u5e76\u53d1\u8bf7\u6c42\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\uff01,do \u65b9\u6cd5\u4e2d\u7684\u6570\u636e\u83b7\u53d6\u64cd\u4f5c\u9700\u8981\u82b1\u8d39\u4e00\u5b9a\u7684\u65f6\u95f4\uff0c\u4ece\u800c\u4fdd\u8bc1\u5e76\u53d1\u8bf7\u6c42\u80fd\u591f\u540c\u65f6\u8fbe\u5230 do \u65b9\u6cd5\u3002,\u6240\u6709\u5e76\u53d1\u8bf7\u6c42\u90fd\u5728\u540c\u4e00\u65f6\u95f4\u6267\u884c\u3002,\u5982\u4f55\u5728 go \u4e2d\u4f7f\u7528 singleflight \u5e93\u907f\u514d\u5e76\u53d1\u6570\u636e\u8bbf\u95ee,\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587
\n\u300a## Go \u4e2d\u7684 singleflight \u5e93\u5982\u4f55\u6709\u6548\u63a7\u5236\u5e76\u53d1\u8bf7\u6c42\uff1f\u300b<\/span>\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230
\n<\/span>\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60
\nGOLANG<\/span>\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a
\nGOLANG<\/span>\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~,
\n<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> ## Go \u4e2d\u7684 singleflight \u5e93\u5982\u4f55\u6709\u6548\u63a7\u5236\u5e76\u53d1\u8bf7\u6c42\uff1f<\/span><\/p>\n

## Go \u4e2d\u7684 singleflight \u5e93\u5982\u4f55\u6709\u6548\u63a7\u5236\u5e76\u53d1\u8bf7\u6c42\uff1f<\/h1>\n

2024-10-29 20:39:54<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587\u300a## Go \u4e2d\u7684 singleflight \u5e93\u5982\u4f55\u6709\u6548\u63a7\u5236\u5e76\u53d1\u8bf7\u6c42\uff1f\u300b<\/span>\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60GOLANG<\/span>\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591aGOLANG<\/span>\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~<\/p>\n

<\/p>\n

\u5982\u4f55\u5728 go \u4e2d\u4f7f\u7528 singleflight \u5e93\u907f\u514d\u5e76\u53d1\u6570\u636e\u8bbf\u95ee<\/strong><\/p>\n

\u5728\u5e76\u53d1\u573a\u666f\u4e2d\uff0c\u591a\u4e2a\u5ba2\u6237\u7aef\u540c\u65f6\u8bf7\u6c42\u540c\u4e00\u4e2a\u6570\u636e\u65f6\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u5e93\u6216\u7f13\u5b58\u7684\u8bbf\u95ee\u91cf\u6fc0\u589e\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0cgo \u8bed\u8a00\u63d0\u4f9b\u4e86 singleflight \u5e93\u6765\u63a7\u5236\u5e76\u53d1\u7684\u8bf7\u6c42\u3002<\/p>\n

\u95ee\u9898\u63cf\u8ff0<\/strong><\/p>\n

\u5728\u4ee5\u4e0b\u4ee3\u7801\u4e2d\uff0c\u5e76\u53d1\u83b7\u53d6\u6570\u636e\u65f6\u51fa\u73b0\u591a\u4e2a\u8bf7\u6c42\u8bbf\u95ee\u6570\u636e\u5e93\uff1a<\/p>\n

package main\n\nimport (\n  \"errors\"\n  \"log\"\n  \"sync\"\n  \"golang.org\/x\/sync\/singleflight\"\n)\n\nvar errornotexist = errors.new(\"not exist\")\nvar g singleflight.group\n\nfunc main() {\n  var wg sync.waitgroup\n  cpu_amount := 4\n  wg.add(cpu_amount)\n\n  for i := 0; i < cpu_amount; i++ {\n    go func() {\n      defer wg.done()\n      data, err := getdata(\"key\")\n      if err != nil {\n        log.print(err)\n        return\n      }\n      log.println(data)\n    }()\n  }\n  wg.wait()\n}\n\nfunc getdata(key string) (string, error) {\n  data, err := getdatafromcache(key)\n  if err == errornotexist {\n    v, err, _ := g.do(key, func() (interface{}, error) {\n      return getdatafromdb(key)\n    })\n    if err != nil {\n      log.println(err)\n      return \"\", err\n    }\n    data = v.(string)\n  } else if err != nil {\n    return \"\", err\n  }\n  return data, nil\n}\n\nfunc getdatafromcache(key string) (string, error) {\n  return \"\", errornotexist\n}\n\nfunc getdatafromdb(key string) (string, error) {\n  log.printf(\"get %s from database\", key)\n  return \"data\", nil\n}<\/pre>\n
\u7b54\u6848<\/strong><\/p>\n
\u5728\u5e76\u53d1\u573a\u666f\u4e2d\uff0csingleflight \u5e93\u901a\u8fc7 do \u65b9\u6cd5\u6709\u6548\u5730\u9650\u5236\u5e76\u53d1\u8bf7\u6c42\u3002\u4f46\u662f\uff0c\u4e3a\u4e86\u786e\u4fdd\u6240\u6709\u5e76\u53d1\u8bf7\u6c42\u90fd\u88ab\u9650\u5236\uff0c\u9700\u8981\u6ee1\u8db3\u4ee5\u4e0b\u6761\u4ef6\uff1a<\/p>\n
    \n
  • \u6240\u6709\u5e76\u53d1\u8bf7\u6c42\u90fd\u5728\u540c\u4e00\u65f6\u95f4\u6267\u884c\u3002<\/li>\n
  • do \u65b9\u6cd5\u4e2d\u7684\u6570\u636e\u83b7\u53d6\u64cd\u4f5c\u9700\u8981\u82b1\u8d39\u4e00\u5b9a\u7684\u65f6\u95f4\uff0c\u4ece\u800c\u4fdd\u8bc1\u5e76\u53d1\u8bf7\u6c42\u80fd\u591f\u540c\u65f6\u8fbe\u5230 do \u65b9\u6cd5\u3002<\/li>\n<\/ul>\n
    \u6587\u7ae0\u63d0\u4f9b\u7684\u4ee3\u7801\u793a\u4f8b\u4e2d\uff0cgetdatafromdb \u65b9\u6cd5\u4ec5\u6253\u5370\u6d88\u606f\u5e76\u7acb\u5373\u8fd4\u56de\uff0c\u5bfc\u81f4\u5e76\u53d1\u8bf7\u6c42\u65e0\u6cd5\u540c\u65f6\u8fdb\u5165 do \u65b9\u6cd5\u3002\u56e0\u6b64\uff0csingleflight \u5e93\u6ca1\u6709\u53d1\u6325\u5e94\u6709\u7684\u4f5c\u7528\uff0c\u5bfc\u81f4\u591a\u4e2a\u8bf7\u6c42\u8bbf\u95ee\u6570\u636e\u5e93\u3002<\/p>\n
    \u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u53ef\u4ee5\u4f7f\u7528 time.sleep \u51fd\u6570\u5ef6\u8fdf getdatafromdb \u65b9\u6cd5\u4e2d\u7684\u64cd\u4f5c\uff0c\u4ece\u800c\u4fdd\u8bc1\u5e76\u53d1\u8bf7\u6c42\u80fd\u591f\u540c\u65f6\u5230\u8fbe do \u65b9\u6cd5\u3002\u4f8b\u5982\uff1a<\/p>\n
    func getDataFromDB(key string) (string, error) {\n  log.Printf(\"get %s from database\", key)\n  time.Sleep(time.Millisecond * 500)\n  return \"data\", nil\n}<\/pre>\n
    \u901a\u8fc7\u8fd9\u79cd\u65b9\u6cd5\uff0csingleflight \u5e93\u53ef\u4ee5\u6709\u6548\u5730\u63a7\u5236\u5e76\u53d1\u8bf7\u6c42\uff0c\u907f\u514d\u6570\u636e\u5e93\u6216\u7f13\u5b58\u7684\u8bbf\u95ee\u91cf\u6fc0\u589e\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u6027\u80fd\u3002<\/p>\n
    \u4eca\u5929\u5173\u4e8e\u300a## Go \u4e2d\u7684 singleflight \u5e93\u5982\u4f55\u6709\u6548\u63a7\u5236\u5e76\u53d1\u8bf7\u6c42\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\uff01<\/p>\n
    \n
    \n <\/dt>\n
    \n   \u5982\u4f55\u5229\u7528wget\u5feb\u901f\u9ad8\u6548\u5730\u62f7\u8d1d\u6574\u4e2a\u7f51\u7ad9\u53ca\u5176\u8d44\u6e90\uff1f\n <\/dd>\n<\/dl>\n
    \n
    \n <\/dt>\n
    \n   SAP Hybris \u5f00\u53d1\u4eba\u5458\u7684\u672a\u6765\uff1a\u5173\u952e\u6280\u80fd\u3001\u91cd\u70b9\u6280\u672f\u548c\u804c\u4e1a\u53ef\u80fd\u6027\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
    \u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587 \u300a...<\/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-205963","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205963","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=205963"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205963\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=205963"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=205963"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=205963"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}