{"id":718,"date":"2020-11-17T20:29:56","date_gmt":"2020-11-17T12:29:56","guid":{"rendered":"https:\/\/www.rayer.idv.tw\/blog\/?p=718"},"modified":"2020-11-17T20:29:56","modified_gmt":"2020-11-17T12:29:56","slug":"singleton-in-go","status":"publish","type":"post","link":"https:\/\/www.rayer.idv.tw\/blog\/?p=718","title":{"rendered":"Singleton in GO"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u96d6\u7136\u6211\u500b\u4eba\u89ba\u5f97\u9019\u500bpattern\u61c9\u8a72\u662f\u53f2\u4e0a\u88ab\u6feb\u7528\u6700\u591a\u7684pattern\uff0c\u6feb\u7528\u5230\u5feb\u8981\u8b8a\u6210anti-pattern\u4e86\uff0c\u4e0d\u904e\u4ecd\u7136\u662f\u4f54\u6709\u4e00\u5e2d\u4e4b\u5730\u7684\u3002\u804a\u4e00\u4e0b\u5728go\u88e1\u9762singleton\u901a\u5e38\u662f\u600e\u9ebc\u5be6\u4f5c\u7684\u3002<\/p>\n\n\n\n<!--more-->\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><p>Go\u672c\u8eab\u4e26\u6c92\u6709\u63d0\u4f9bSingleton\uff0c\u800c\u6211\u5176\u5be6\u500b\u4eba\u4e5f\u4e0d\u662f\u5f88\u611bSingleton Pattern\u3002\u4e0d\u904e\u6709\u4e9b\u8a2d\u8a08\u7f3a\u4ed6\u4e0d\u53ef\uff0c\u6bd4\u5982\u8aaa\u67d0\u4e9b\u8a2d\u8a08\u4e0bSystem Context\u5c31\u5fc5\u9808\u8981\u662f\u4e00\u500bSingleton\uff0c\u6240\u4ee5\u9084\u662f\u5f97\u770b\u770b\u8981\u600e\u9ebc\u5728Go\u88e1\u9762\u5be6\u4f5c\u51fa\u4f86\u3002<\/p>\n<h2>\u6700\u76f4\u89ba\u7684\u505a\u6cd5<\/h2>\n<pre><code class=\"language-go\">type singleton struct {\n}\n\nvar instance *singleton\n\nfunc GetInstance() *singleton {\n\tif instance == nil {\n\t\tinstance = &amp;singleton{}\n\t}\n\treturn instance\n}\n<\/code><\/pre>\n<p>\u9019\u505a\u6cd5\u5f88\u76f4\u89ba\uff0c\u5927\u591a\u6578\u7684\u60c5\u6cc1\u4f86\u8b1b\u61c9\u8a72\u4e5f\u5920\u7528\u4e86\u3002\u4f46\u662f\u9019\u500b\u6700\u660e\u986f\u7684\u554f\u984c\u5c31\u662f<code>instance = &amp;singleton{}<\/code>\u9019\u6bb5\u986f\u7136\u5728multi thread\u6703\u6709\u9ede\u554f\u984c&#8230;<\/p>\n<h2>\u90a3&#8230;.\u7b2c\u4e8c\u76f4\u89ba\u7684\u505a\u6cd5<\/h2>\n<pre><code class=\"language-go\">var mu Sync.Mutex\n\nfunc GetInstance() *singleton {\n    mu.Lock()                        \n    defer mu.Unlock()\n\n    if instance == nil {\n        instance = &amp;singleton{}\n    }\n    return instance\n}\n<\/code><\/pre>\n<p>\u591a\u8667go\u6709<code>defer<\/code>\u9019\u500b\u95dc\u9375\u5b57\uff0c\u6574\u500bmutex\u7684\u505a\u6cd5\u8b8a\u5f97\u5f88\u8f15\u9b06\u3002\u4f46\u662f&#8230;\u70ba\u4ec0\u9ebc\u8981\u9396\u90a3\u9ebc\u5927\u7684\u7bc4\u570d\u554a? XD \u6574\u500bGetInstance\u7684\u6548\u80fd\u90fd\u88ab\u9019\u500b\u5927\u7bc4\u570d\u5730\u5716\u9396\u7d66\u641e\u721b\u4e86&#8230;<\/p>\n<h2>\u597d\u50cf\u4e5f\u9817\u7b26\u5408\u76f4\u89ba\u7684\u505a\u6cd5?<\/h2>\n<pre><code class=\"language-go\">var mu Sync.Mutex\n\nfunc GetInstance() *singleton {\n\n    if instance == nil {\n        mu.Lock()\n        defer mu.Unlock()\n        if instance == nil {\n                instance = &amp;singleton{}\n        }\n    }\n    return instance\n}\n<\/code><\/pre>\n<p>\u6709\u5b8c\u6c92\u5b8c\uff08\u7ffb\u684c\uff09\uff0c\u9019\u505a\u6cd5\u4e0d\u80fd\u8aaa\u932f\uff0c\u4e0d\u904e\u8981\u628acode\u5beb\u6210\u9019\u6a23\u9084\u771f\u7684\u9700\u8981\u6eff\u9ad8\u6065\u529b\u7684\uff0c\u5e78\u597dGo\u6709\u767c\u73fe\u9019\u9ede\uff0c\u70ba\u4e86\u8b93\u6211\u5011\u5bebSingleton\u7684\u6642\u5019\u4e0d\u81f3\u65bc\u7f9e\u6127\u800c\u4ea1\uff0c\u4ed6\u5011\u6709\u63d0\u4f9b\u4e86<code>once<\/code><\/p>\n<h2>\u4f7f\u7528once?<\/h2>\n<p>\u76ee\u524d\u4f86\u8b1b\u6bd4\u8f03\u5e38\u898b\u7684\u5408\u7406\u505a\u6cd5\u662f\u4f7f\u7528go\u5167\u5efa\u7684once\uff0c\u9019\u53ef\u4ee5\u4fdd\u8b49\u88e1\u9762\u7684code\u53ea\u6703\u88ab\u8dd1\u4e00\u6b21\uff0c\u9019\u5927\u6982\u9577\u5f97\u50cf\u9019\u6a23<\/p>\n<pre><code class=\"language-go\">var instance *singleton\nvar once sync.Once\n\nfunc GetInstance() *singleton {\n    once.Do(func() {\n        instance = &amp;singleton{}\n    })\n    return instance\n}\n<\/code><\/pre>\n<p>\u5176\u5be6\u53ef\u4ee5\u53c3\u8003\u4e00\u4e0bonce\u539f\u59cb\u78bc\uff0c\u5beb\u7684\u6eff\u6f02\u4eae\u7684\u3002\u7c21\u55ae\u7684\u8aaa\uff0c\u5c31\u662f\u5728\u88e1\u9762\u653e\u4e00\u500b<code>atomic int<\/code>\u4f86\u7576\u4f5cflag\uff0c\u7576int &gt; 0\u5c31\u6703\u76f4\u63a5\u8df3\u51fa\uff0c\u5426\u5247\u5c31\u6703\u57f7\u884cDo\u4e26\u4e14\u628aatomic int +1\u3002<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u96d6\u7136\u6211\u500b\u4eba\u89ba\u5f97\u9019\u500bpattern\u61c9\u8a72\u662f\u53f2\u4e0a\u88ab\u6feb\u7528\u6700\u591a\u7684pattern\uff0c\u6feb\u7528\u5230\u5feb\u8981\u8b8a\u6210anti-pattern\u4e86\uff0c\u4e0d\u904e\u4ecd\u7136\u662f\u4f54\u6709\u4e00\u5e2d\u4e4b\u5730\u7684\u3002\u804a\u4e00\u4e0b\u5728go\u88e1\u9762singleton\u901a\u5e38\u662f\u600e\u9ebc\u5be6\u4f5c\u7684\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[38],"tags":[88,86],"class_list":["post-718","post","type-post","status-publish","format-standard","hentry","category-code","tag-design-pattern","tag-golang"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - 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