...etonInstance = new Singleton()一行)。好在有聰明人,研究出了Double-check。 version 2.2: Double-check (有問題版) class Singleton { private static Singleton singletonInstance; // A private Singleton (){} ...
...pm ERR! npm ERR! If you believe this might be a permissions issue, please double-check the npm ERR! permissions of the file and its containing directories, or try running npm ERR! the command agai...
...pm ERR! npm ERR! If you believe this might be a permissions issue, please double-check the npm ERR! permissions of the file and its containing directories, or try running npm ERR! the command agai...
...實際上會對程序的執行效率造成負面影響。 雙重檢查(Double-Check) 代碼二相對于代碼一的效率問題,其實是為了解決1%幾率的問題,而使用了一個100%出現的防護盾。那有一個優化的思路,就是把100%出現的防護盾,也改為1%的幾...
... 2. If a task can be successfully queued, then we still need * to double-check whether we should have added a thread * (because existing ones died since last checking) or that ...
...pm ERR! npm ERR! If you believe this might be a permissions issue, please double-check the npm ERR! permissions of the file and its containing directories, or try running npm ERR! the command agai...
...,是否有在上線高峰期操作記錄,部署過程中是否執行了double-check,在哪個階段執行了回滾等等,來形成一個個的打分項。 其次是如何去制定風險量化的標準,也就是如何用各個指標去構造一個最佳實踐。這更像是一個數學建...
... return instance; } } 這種寫法用了兩個if判斷,也就是Double-Check,并且同步的不是方法,而是代碼塊,效率較高,是對第三種寫法的改進。為什么要做兩次判斷呢?這是為了線程安全考慮,還是那個場景,對象還沒實例化,兩...
... 2. If a task can be successfully queued, then we still need * to double-check whether we should have added a thread * (because existing ones died since last checking) or that ...
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