{"id":10020935,"date":"2025-08-04T21:22:45","date_gmt":"2025-08-04T13:22:45","guid":{"rendered":"https:\/\/itmax.cn\/?p=10020935"},"modified":"2025-08-04T21:22:45","modified_gmt":"2025-08-04T13:22:45","slug":"%e5%91%8a%e5%88%ab%e7%bc%93%e5%ad%98%e5%87%bb%e7%a9%bf%ef%bc%81go-%e8%af%ad%e8%a8%80%e4%b8%ad%e7%9a%84%e9%98%b2%e5%b9%b6%e5%8f%91%e7%a5%9e%e5%99%a8%ef%bc%9asingleflight-%e5%8c%85%e6%b7%b1%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10020935","title":{"rendered":"\u544a\u522b\u7f13\u5b58\u51fb\u7a7f\uff01Go \u8bed\u8a00\u4e2d\u7684\u9632\u5e76\u53d1\u795e\u5668\uff1asingleflight \u5305\u6df1\u5ea6\u89e3\u6790"},"content":{"rendered":"<p>\u5728\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\uff0c\u6211\u4eec\u5e38\u5e38\u9047\u5230\u591a\u4e2a\u8bf7\u6c42\u540c\u65f6\u8bbf\u95ee\u540c\u4e00\u4efd\u8d44\u6e90\u7684\u60c5\u51b5\u3002\u4f8b\u5982\uff0c\u5f53\u7f13\u5b58\u5931\u6548\u65f6\uff0c\u5927\u91cf\u8bf7\u6c42\u53ef\u80fd\u540c\u65f6\u89e6\u53d1\u6570\u636e\u5e93\u67e5\u8be2\uff0c\u9020\u6210\u8d44\u6e90\u6d6a\u8d39\u751a\u81f3\u6570\u636e\u5e93\u5d29\u6e83\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e00\u95ee\u9898\uff0c Go \u8bed\u8a00\u63d0\u4f9b\u4e86 <code>singleflight<\/code> \u5305 \uff0c\u5b83\u80fd\u591f\u5c06\u591a\u4e2a\u76f8\u540c key \u7684\u8bf7\u6c42\u5408\u5e76\u4e3a\u4e00\u6b21\u5b9e\u9645\u8c03\u7528\uff0c\u4ece\u800c\u6781\u5927\u5730\u63d0\u5347\u7cfb\u7edf\u6027\u80fd\u3002<\/p>\n<p>\u672c\u6587\u5c06\u8be6\u7ec6\u89e3\u6790 singleflight \u5305\u7684\u539f\u7406\u3001\u5b9e\u73b0\u65b9\u6cd5\u4ee5\u53ca\u5e94\u7528\u573a\u666f\uff0c\u5e76\u901a\u8fc7\u4e30\u5bcc\u7684\u793a\u4f8b\u4ee3\u7801\u5e26\u4f60\u5168\u9762\u4e86\u89e3\u5b83\u7684\u4f7f\u7528\u6280\u5de7\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000047109377\" alt=\"\" title=\"\"><\/p>\n<hr>\n<h2>\u4e00\u3001 singleflight \u5305 \u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>singleflight \u5305 \uff08\u4f4d\u4e8e <code>golang.org\/x\/sync\/singleflight <\/code>\uff09 \u7684\u4e3b\u8981\u4f5c\u7528\u662f\u5bf9\u591a\u4e2a\u9488\u5bf9\u540c\u4e00 key \u7684\u5e76\u53d1\u8bf7\u6c42\u8fdb\u884c\u5408\u5e76\u3002\u5176\u6838\u5fc3\u601d\u60f3\u662f\uff1a<\/p>\n<ul>\n<li>\u5f53\u591a\u4e2a goroutine \u540c\u65f6\u8c03\u7528\u67d0\u4e2a\u64cd\u4f5c\u65f6\uff0c\u5982\u679c\u4f20\u5165\u76f8\u540c\u7684 key \uff0c\u5219\u53ea\u5141\u8bb8\u7b2c\u4e00\u4e2a\u8bf7\u6c42\u6267\u884c\u5b9e\u9645\u64cd\u4f5c\uff0c\u540e\u7eed\u8bf7\u6c42\u7b49\u5f85\u8be5\u64cd\u4f5c\u8fd4\u56de\u7ed3\u679c\uff0c\u5e76\u5171\u4eab\u8fd9\u4e00\u7ed3\u679c\u3002<\/li>\n<li>\u8fd9\u79cd\u8bbe\u8ba1\u907f\u514d\u4e86\u91cd\u590d\u8ba1\u7b97\u6216\u91cd\u590d IO \u64cd\u4f5c\uff0c\u4ece\u800c\u6709\u6548\u964d\u4f4e\u7cfb\u7edf\u8d44\u6e90\u7684\u6d88\u8017\uff0c\u63d0\u5347\u54cd\u5e94\u901f\u5ea6\u3002<\/li>\n<\/ul>\n<blockquote><p><strong>\u6e29\u99a8\u63d0\u793a<\/strong>  <br \/>\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c singleflight \u5305\u9002\u7528\u4e8e\u7f13\u5b58\u91cd\u5efa\u3001\u6570\u636e\u5e93\u67e5\u8be2\u3001\u63a5\u53e3\u9650\u6d41\u7b49\u573a\u666f\uff0c\u662f\u5e94\u5bf9\u9ad8\u5e76\u53d1\u8bf7\u6c42\u65f6\u4e00\u4e2a\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\u3002<\/p><\/blockquote>\n<hr>\n<h2>\u4e8c\u3001 singleflight \u5305\u7684\u5de5\u4f5c\u539f\u7406<\/h2>\n<h3>2.1 \u5185\u90e8\u5b9e\u73b0\u601d\u8def<\/h3>\n<pre><code class=\"go\">type Group struct {\n    mu sync.Mutex       \/\/ \u4e92\u65a5\u9501\u4fdd\u62a4\u6620\u5c04\u8868\n    m  map[string]*call \/\/ \u6b63\u5728\u5904\u7406\u7684\u8bf7\u6c42\u6620\u5c04\n}\n\ntype call struct {\n    wg  sync.WaitGroup \/\/ \u7528\u4e8e\u7b49\u5f85\u7ed3\u679c\n    val interface{}    \/\/ \u8fd4\u56de\u7684\u7ed3\u679c\n    err error          \/\/ \u8fd4\u56de\u7684\u9519\u8bef\n}<\/code><\/pre>\n<p>singleflight \u5305\u901a\u8fc7\u5185\u90e8\u7ef4\u62a4\u4e00\u4e2a map \u6765\u8ffd\u8e2a\u5f53\u524d\u6b63\u5728\u8fdb\u884c\u7684\u8bf7\u6c42\u3002\u5176\u5de5\u4f5c\u6d41\u7a0b\u5927\u81f4\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u5f53\u8c03\u7528 Do \u65b9\u6cd5\u65f6\uff0c\u4f1a\u68c0\u67e5\u662f\u5426\u5b58\u5728\u76f8\u540c key \u7684\u8bf7\u6c42\u6b63\u5728\u6267\u884c\u3002<\/li>\n<li>\u5982\u679c\u5b58\u5728\uff0c\u5219\u5f53\u524d\u8c03\u7528\u4e0d\u4f1a\u6267\u884c\u56de\u8c03\u51fd\u6570\uff0c\u800c\u662f\u7b49\u5f85\u4e4b\u524d\u7684\u8c03\u7528\u5b8c\u6210\uff0c\u5e76\u5171\u4eab\u5176\u8fd4\u56de\u503c\u3002<\/li>\n<li>\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5219\u5f53\u524d\u8c03\u7528\u4f1a\u6267\u884c\u4f20\u5165\u7684\u56de\u8c03\u51fd\u6570\uff0c\u5e76\u5c06\u7ed3\u679c\u7f13\u5b58\uff0c\u4ee5\u4fbf\u540e\u7eed\u76f8\u540c key \u7684\u8c03\u7528\u76f4\u63a5\u590d\u7528\u7ed3\u679c\u3002<\/li>\n<\/ol>\n<p>\u8fd9\u79cd\u8bbe\u8ba1\u5728\u5e76\u53d1\u573a\u666f\u4e0b\u80fd\u591f\u663e\u8457\u51cf\u5c11\u91cd\u590d\u5de5\u4f5c\uff0c\u786e\u4fdd\u53ea\u6709\u4e00\u6b21\u5b9e\u9645\u64cd\u4f5c\u53d1\u751f\uff0c\u540c\u65f6\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u3002<\/p>\n<h3>2.2 \u540c\u6b65\u673a\u5236\u4fdd\u969c<\/h3>\n<p>singleflight \u5305\u4f7f\u7528\u4e86\u5185\u90e8\u7684\u9501\u673a\u5236\u6765\u4fdd\u8bc1 map \u64cd\u4f5c\u7684\u5e76\u53d1\u5b89\u5168\u3002\u540c\u65f6\uff0c\u8fd4\u56de\u503c\u901a\u8fc7 channel \u7b49\u65b9\u5f0f\u540c\u6b65\u7ed9\u7b49\u5f85\u4e2d\u7684\u8c03\u7528\u8005\u3002\u8fd9\u6837\u7684\u8bbe\u8ba1\u65e2\u4fdd\u8bc1\u4e86\u9ad8\u5e76\u53d1\u4e0b\u7684\u6b63\u786e\u6027\uff0c\u4e5f\u80fd\u8fbe\u5230\u8f83\u597d\u7684\u6027\u80fd\u8868\u73b0\u3002<\/p>\n<hr>\n<h2>\u4e09\u3001\u9002\u7528\u573a\u666f\u4e0e\u5e94\u7528\u5b9e\u4f8b<\/h2>\n<h3>3.1 \u5e38\u89c1\u5e94\u7528\u573a\u666f<\/h3>\n<ul>\n<li><strong>\u7f13\u5b58\u7a7f\u900f<\/strong>\uff1a\u5f53\u7f13\u5b58\u5931\u6548\u540e\uff0c\u591a\u4e2a\u8bf7\u6c42\u540c\u65f6\u67e5\u8be2\u6570\u636e\u5e93\uff0c\u53ef\u4ee5\u5229\u7528 singleflight \u5305\u53ea\u89e6\u53d1\u4e00\u6b21\u6570\u636e\u5e93\u67e5\u8be2\u64cd\u4f5c\uff0c\u5c06\u7ed3\u679c\u5206\u53d1\u7ed9\u6240\u6709\u8bf7\u6c42\u3002<\/li>\n<li><strong>\u9650\u6d41\u964d\u7ea7<\/strong>\uff1a\u5728\u77ed\u65f6\u95f4\u5185\u9ad8\u5e76\u53d1\u8bf7\u6c42\u67d0\u4e2a\u63a5\u53e3\u65f6\uff0c singleflight \u53ef\u4ee5\u51cf\u5c11\u540e\u7aef\u670d\u52a1\u7684\u8d1f\u8f7d\u3002<\/li>\n<li><strong>\u5206\u5e03\u5f0f\u7cfb\u7edf<\/strong>\uff1a\u5728\u591a\u8282\u70b9\u90e8\u7f72\u65f6\uff0c\u540c\u4e00\u4efd\u8d44\u6e90\u7684\u8bf7\u6c42\u53ef\u80fd\u4f1a\u5728\u77ed\u65f6\u95f4\u5185\u96c6\u4e2d\u5230\u4e00\u4e2a\u8282\u70b9\uff0c\u5229\u7528 singleflight \u53ef\u4ee5\u6709\u6548\u5408\u5e76\u8bf7\u6c42\uff0c\u964d\u4f4e\u7cfb\u7edf\u538b\u529b\u3002<\/li>\n<\/ul>\n<h3>3.2 \u8be6\u7ec6\u793a\u4f8b<\/h3>\n<p>\u4e0b\u9762\u901a\u8fc7\u4e00\u4e2a\u8be6\u7ec6\u793a\u4f8b\uff0c\u6f14\u793a\u5982\u4f55\u4f7f\u7528 singleflight \u5305 \u5408\u5e76\u591a\u4e2a\u5e76\u53d1\u8bf7\u6c42\u3002\u793a\u4f8b\u4e2d\u6a21\u62df\u4e86\u591a\u4e2a goroutine \u540c\u65f6\u8bf7\u6c42\u4e00\u4e2a\u6a21\u62df\u8017\u65f6\u64cd\u4f5c\uff0c\u5b9e\u9645\u53ea\u4f1a\u6267\u884c\u4e00\u6b21\u64cd\u4f5c\uff0c\u5176\u4ed6\u8bf7\u6c42\u5171\u4eab\u8be5\u7ed3\u679c\u3002<\/p>\n<pre><code class=\"go\">package main\n\nimport (\n    &quot;fmt&quot;\n    &quot;sync&quot;\n    &quot;time&quot;\n\n    &quot;golang.org\/x\/sync\/singleflight&quot;\n)\n\n\/\/ \u6a21\u62df\u8017\u65f6\u64cd\u4f5c\uff0c\u4f8b\u5982\u4ece\u6570\u636e\u5e93\u4e2d\u83b7\u53d6\u6570\u636e\nfunc fetchData(param string, id int) (string, error) {\n    \/\/ \u6a21\u62df\u64cd\u4f5c\u8017\u65f6  1  \u79d2\n    time.Sleep(time.Second)\n    \/\/ \u5f53\u524d\u65f6\u95f4\uff08\u7cbe\u786e\u5230\u7eb3\u79d2\uff09\n    fmt.Printf(&quot;\u5f53\u524d\u65f6\u95f4 %d \/n&quot;, time.Now().UnixNano())\n    return fmt.Sprintf(&quot;id %d \u83b7\u53d6\u7684\u6570\u636e\uff1a %s&quot;, id, param), nil\n}\n\nfunc main() {\n    \/\/ \u5b9a\u4e49 singleflight.Group \u5bf9\u8c61\n    var group singleflight.Group\n    \/\/ \u4f7f\u7528 WaitGroup \u7b49\u5f85\u6240\u6709 goroutine \u6267\u884c\u5b8c\u6bd5\n    var wg sync.WaitGroup\n\n    \/\/ \u6a21\u62df  5  \u4e2a\u5e76\u53d1\u8bf7\u6c42\u4f7f\u7528\u76f8\u540c\u7684 key &quot;resource&quot;\n    for i := 0; i &lt; 5; i++ {\n        wg.Add(1)\n        go func(id int) {\n            defer wg.Done()\n            \/\/ group.Do \u65b9\u6cd5\u5408\u5e76\u76f8\u540c key \u7684\u8bf7\u6c42\uff0c\u53ea\u6267\u884c\u4e00\u6b21 fetchData\n            value, err, shared := group.Do(&quot;resource&quot;, func() (interface{}, error) {\n                \/\/ \u8fd9\u91cc\u4f20\u5165\u5b9e\u9645\u9700\u8981\u6267\u884c\u7684\u51fd\u6570\n                return fetchData(&quot;example&quot;, id)\n            })\n            if err != nil {\n                fmt.Printf(&quot;\u8bf7\u6c42 %d \u51fa\u9519\uff1a %v\/n&quot;, id, err)\n                return\n            }\n            \/\/ shared \u8868\u793a\u7ed3\u679c\u662f\u5426\u4e3a\u5171\u4eab\n            fmt.Printf(&quot;\u8bf7\u6c42 %d \u5f97\u5230\u7ed3\u679c\uff1a [%v]  \uff0c\u662f\u5426\u5171\u4eab\uff1a %v\/n&quot;, id, value, shared)\n        }(i)\n    }\n\n    wg.Wait()\n}<\/code><\/pre>\n<p>\u8fd4\u56de\u503c\u5927\u81f4\u4e3a\uff1a<\/p>\n<pre><code class=\"bash\">\u5f53\u524d\u65f6\u95f4 1744638486167220000 \n\u8bf7\u6c42 1 \u5f97\u5230\u7ed3\u679c\uff1a [id 1 \u83b7\u53d6\u7684\u6570\u636e\uff1a example]  \uff0c\u662f\u5426\u5171\u4eab\uff1a true\n\u8bf7\u6c42 0 \u5f97\u5230\u7ed3\u679c\uff1a [id 1 \u83b7\u53d6\u7684\u6570\u636e\uff1a example]  \uff0c\u662f\u5426\u5171\u4eab\uff1a true\n\u8bf7\u6c42 3 \u5f97\u5230\u7ed3\u679c\uff1a [id 1 \u83b7\u53d6\u7684\u6570\u636e\uff1a example]  \uff0c\u662f\u5426\u5171\u4eab\uff1a true\n\u8bf7\u6c42 4 \u5f97\u5230\u7ed3\u679c\uff1a [id 1 \u83b7\u53d6\u7684\u6570\u636e\uff1a example]  \uff0c\u662f\u5426\u5171\u4eab\uff1a true\n\u8bf7\u6c42 2 \u5f97\u5230\u7ed3\u679c\uff1a [id 1 \u83b7\u53d6\u7684\u6570\u636e\uff1a example]  \uff0c\u662f\u5426\u5171\u4eab\uff1a true<\/code><\/pre>\n<p><strong>\u4ee3\u7801\u89e3\u6790<\/strong><\/p>\n<ol>\n<li>\u9996\u5148\u5b9a\u4e49\u4e86\u4e00\u4e2a\u6a21\u62df\u8017\u65f6\u64cd\u4f5c\u7684\u51fd\u6570 fetchData \uff0c\u8be5\u51fd\u6570\u6a21\u62df\u4ece\u6570\u636e\u5e93\u6216\u5176\u4ed6 IO \u64cd\u4f5c\u4e2d\u83b7\u53d6\u6570\u636e\u3002<\/li>\n<li>\u58f0\u660e\u4e00\u4e2a singleflight.Group \u5bf9\u8c61\uff0c\u7528\u4e8e\u5408\u5e76\u76f8\u540c key \u7684\u8bf7\u6c42\u3002<\/li>\n<li>\u5728\u5faa\u73af\u4e2d\u542f\u52a8  5  \u4e2a goroutine \uff0c\u6bcf\u4e2a goroutine \u8c03\u7528 group.Do \u65b9\u6cd5\u5e76\u4f20\u5165\u76f8\u540c key &#8220;resource&#8221; \u3002<\/li>\n<li>\u5f53\u7b2c\u4e00\u4e2a\u8bf7\u6c42\u6267\u884c fetchData \u51fd\u6570\u540e\uff0c\u5176\u4ed6\u8bf7\u6c42\u4f1a\u7b49\u5f85\u8be5\u64cd\u4f5c\u5b8c\u6210\uff0c\u5e76\u5171\u4eab\u540c\u4e00\u4e2a\u7ed3\u679c\u3002<\/li>\n<li>\u6700\u7ec8\u8f93\u51fa\u4e2d\uff0c\u53ea\u6709\u4e00\u6b21\u5b9e\u9645\u8c03\u7528\u53d1\u751f\uff0c\u5176\u4ed6\u8bf7\u6c42\u90fd\u901a\u8fc7 shared \u6807\u5fd7\u5f97\u77e5\u5176\u7ed3\u679c\u662f\u5171\u4eab\u7684\u3002<\/li>\n<\/ol>\n<p>\u9632\u6b62\u7f13\u5b58\u51fb\u7a7f\u5b9e\u6218\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n<pre><code class=\"go\">package main\n\nimport (\n    &quot;golang.org\/x\/sync\/singleflight&quot;\n    &quot;time&quot;\n)\n\nvar (\n    group singleflight.Group\n    cache = make(map[string]string) \/\/ \u6a21\u62df\u7f13\u5b58\n)\n\n\/\/ \u83b7\u53d6\u6570\u636e\uff08\u5e26\u7f13\u5b58\u51fb\u7a7f\u4fdd\u62a4\uff09\nfunc GetData(key string) (string, error) {\n    \/\/ \u5c1d\u8bd5\u4ece\u7f13\u5b58\u8bfb\u53d6\n    if val, ok := cache[key]; ok {\n        return val, nil\n    }\n\n    \/\/ \u4f7f\u7528 singleflight \u4fdd\u62a4\u6570\u636e\u5e93\u67e5\u8be2\n    result, err, _ := group.Do(key, func() (interface{}, error) {\n        \/\/ \u6a21\u62df\u6570\u636e\u5e93\u67e5\u8be2\uff08\u8017\u65f6 100ms\uff09\n        time.Sleep(100 * time.Millisecond)\n        return QueryFromDB(key), nil\n    })\n\n    \/\/ \u66f4\u65b0\u7f13\u5b58\n    cache[key] = result.(string)\n    return result.(string), err\n}\n\n\/\/ \u6a21\u62df\u6570\u636e\u5e93\u67e5\u8be2\nfunc QueryFromDB(key string) string {\n    return &quot;data_for_&quot; + key\n}<\/code><\/pre>\n<hr>\n<h2>\u56db\u3001 singleflight \u5305\u7684\u4f18\u52bf\u4e0e\u6ce8\u610f\u4e8b\u9879<\/h2>\n<h3>4.1 \u4f18\u52bf<\/h3>\n<ul>\n<li><strong>\u51cf\u5c11\u91cd\u590d\u8c03\u7528<\/strong>\uff1a\u901a\u8fc7\u5408\u5e76\u76f8\u540c key \u7684\u8bf7\u6c42\uff0c\u80fd\u591f\u663e\u8457\u51cf\u5c11\u91cd\u590d\u8c03\u7528\uff0c\u964d\u4f4e\u7cfb\u7edf\u8d1f\u8f7d\u3002<\/li>\n<li><strong>\u7b80\u5355\u6613\u7528<\/strong>\uff1a\u53ea\u9700\u5c11\u91cf\u4ee3\u7801\u5c31\u80fd\u5b9e\u73b0\u8bf7\u6c42\u5408\u5e76\uff0c\u4e14\u5185\u90e8\u5df2\u7ecf\u5b9e\u73b0\u4e86\u7ebf\u7a0b\u5b89\u5168\u673a\u5236\u3002<\/li>\n<li><strong>\u9002\u7528\u573a\u666f\u5e7f\u6cdb<\/strong>\uff1a\u65e0\u8bba\u662f\u7f13\u5b58\u91cd\u5efa\u3001\u6570\u636e\u67e5\u8be2\u8fd8\u662f\u9650\u6d41\u964d\u7ea7\uff0c<code>singleflight<\/code> \u5305\u90fd\u80fd\u53d1\u6325\u91cd\u8981\u4f5c\u7528\u3002<\/li>\n<\/ul>\n<h3>4.2 \u6ce8\u610f\u4e8b\u9879<\/h3>\n<ul>\n<li><strong>\u9519\u8bef\u5904\u7406<\/strong>\uff1a\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u9700\u6ce8\u610f\u56de\u8c03\u51fd\u6570\u5185\u53ef\u80fd\u51fa\u73b0\u7684\u9519\u8bef\uff0c\u5e76\u5bf9\u9519\u8bef\u8fdb\u884c\u5408\u7406\u5904\u7406\uff0c\u9632\u6b62\u9519\u8bef\u7ed3\u679c\u5171\u4eab\u3002<\/li>\n<li><strong>\u7f13\u5b58\u4e0e\u66f4\u65b0\u7b56\u7565<\/strong>\uff1a\u5bf9\u4e8e\u9700\u8981\u9891\u7e41\u66f4\u65b0\u7684\u8d44\u6e90\uff0c\u5355\u6b21\u5408\u5e76\u64cd\u4f5c\u53ef\u80fd\u5e76\u4e0d\u9002\u5408\u6240\u6709\u573a\u666f\uff0c\u9700\u8981\u7ed3\u5408\u7f13\u5b58\u5931\u6548\u673a\u5236\u4e00\u540c\u4f7f\u7528\u3002<\/li>\n<li><strong>\u8d44\u6e90\u9501\u7ade\u4e89<\/strong>\uff1a\u867d\u7136 singleflight \u5305 \u5185\u90e8\u5df2\u7ecf\u4fdd\u8bc1\u4e86\u5e76\u53d1\u5b89\u5168\uff0c\u4f46\u5728\u8d85\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\uff0c\u4ecd\u9700\u5173\u6ce8\u6f5c\u5728\u7684\u9501\u7ade\u4e89\u95ee\u9898\uff0c\u5fc5\u8981\u65f6\u53ef\u4ee5\u8fdb\u884c\u6027\u80fd\u6d4b\u8bd5\u548c\u8c03\u4f18\u3002<\/li>\n<\/ul>\n<hr>\n<h2>\u4e94\u3001\u5b9e\u9645\u9879\u76ee\u4e2d\u7684\u5e94\u7528\u5efa\u8bae<\/h2>\n<p>\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\uff0c\u4f7f\u7528 singleflight \u5305 \u65f6\u5efa\u8bae\u7ed3\u5408\u4ee5\u4e0b\u51e0\u70b9\u6765\u8fdb\u884c\u4f18\u5316\uff1a<\/p>\n<ul>\n<li><strong>\u4e0e\u7f13\u5b58\u7ed3\u5408\u4f7f\u7528<\/strong>\uff1a\u5bf9\u4e8e\u9ad8\u5e76\u53d1\u7684\u6570\u636e\u67e5\u8be2\u573a\u666f\uff0c\u53ef\u4ee5\u5148\u67e5\u8be2\u7f13\u5b58\uff0c\u53ea\u6709\u5728\u7f13\u5b58\u5931\u6548\u65f6\u624d\u4f7f\u7528 singleflight \u89e6\u53d1\u5b9e\u9645\u7684 IO \u64cd\u4f5c\u3002<\/li>\n<li><strong>\u76d1\u63a7\u4e0e\u65e5\u5fd7\u8bb0\u5f55<\/strong>\uff1a\u5728\u5408\u5e76\u8bf7\u6c42\u7684\u540c\u65f6\uff0c\u53ef\u4ee5\u6dfb\u52a0\u76d1\u63a7\u548c\u65e5\u5fd7\u8bb0\u5f55\uff0c\u5e2e\u52a9\u5b9a\u4f4d\u6f5c\u5728\u6027\u80fd\u74f6\u9888\u3002<\/li>\n<li><strong>\u5408\u7406\u8bbe\u7f6e\u8d85\u65f6<\/strong>\uff1a\u5728\u7f51\u7edc\u4e0d\u7a33\u5b9a\u6216\u5916\u90e8\u63a5\u53e3\u54cd\u5e94\u8f83\u6162\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u5408\u7406\u7684\u8d85\u65f6\u65f6\u95f4\uff0c\u907f\u514d\u8bf7\u6c42\u957f\u65f6\u95f4\u7b49\u5f85\u3002<\/li>\n<\/ul>\n<hr>\n<h2>\u516d\u3001\u603b\u7ed3<\/h2>\n<p>singleflight \u5305 \u4e3a Go \u8bed\u8a00\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u4e00\u79cd\u9ad8\u6548\u7b80\u5355\u7684\u65b9\u5f0f\u6765\u5e94\u5bf9\u9ad8\u5e76\u53d1\u4e0b\u7684\u91cd\u590d\u8bf7\u6c42\u95ee\u9898\u3002\u901a\u8fc7\u5c06\u76f8\u540c key \u7684\u8bf7\u6c42\u5408\u5e76\uff0c\u53ea\u8fdb\u884c\u4e00\u6b21\u5b9e\u9645\u64cd\u4f5c\uff0c\u53ef\u4ee5\u5927\u5e45\u63d0\u5347\u7cfb\u7edf\u7684\u6027\u80fd\u548c\u7a33\u5b9a\u6027\u3002<\/p>\n<p>\u672c\u6587\u8be6\u7ec6\u4ecb\u7ecd\u4e86 singleflight \u5305 \u7684\u5de5\u4f5c\u539f\u7406\u3001\u5e38\u89c1\u5e94\u7528\u573a\u666f\u3001\u8be6\u7ec6\u4ee3\u7801\u5b9e\u73b0\u4ee5\u53ca\u4f7f\u7528\u4e2d\u7684\u6ce8\u610f\u4e8b\u9879\uff0c\u65e8\u5728\u5e2e\u52a9\u5927\u5bb6\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u7075\u6d3b\u8fd0\u7528\u8fd9\u4e00\u5de5\u5177\uff0c\u6784\u5efa\u9ad8\u6548\u7a33\u5b9a\u7684\u670d\u52a1\u3002<\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000047109375\">https:\/\/segmentfault.com\/a\/1190000047109375<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\uff0c\u6211\u4eec\u5e38\u5e38\u9047\u5230\u591a\u4e2a\u8bf7\u6c42\u540c\u65f6\u8bbf\u95ee\u540c\u4e00\u4efd\u8d44\u6e90\u7684\u60c5\u51b5\u3002\u4f8b\u5982\uff0c\u5f53\u7f13\u5b58\u5931\u6548\u65f6\uff0c\u5927\u91cf\u8bf7\u6c42\u53ef\u80fd\u540c\u65f6\u89e6\u53d1\u6570\u636e\u5e93\u67e5 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10020935","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10020935","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10020935"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10020935\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10020935"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10020935"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10020935"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}