...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(shí)際上會(huì)對(duì)程序的執(zhí)行效率造成負(fù)面影響。 雙重檢查(Double-Check) 代碼二相對(duì)于代碼一的效率問題,其實(shí)是為了解決1%幾率的問題,而使用了一個(gè)100%出現(xiàn)的防護(hù)盾。那有一個(gè)優(yōu)化的思路,就是把100%出現(xiàn)的防護(hù)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 ...
...若沒有這個(gè)判斷豈不又重新創(chuàng)建了新對(duì)象。但這種典型的double-check的懶漢單例存在了一個(gè)可能發(fā)生的問題, jvm接收到new指令時(shí),簡(jiǎn)單分為3步(實(shí)際更多,可參考深入理解虛擬機(jī)),1分配內(nèi)存2實(shí)例化對(duì)象3將內(nèi)存地址指向引用。j...
...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(zhí)行了double-check,在哪個(gè)階段執(zhí)行了回滾等等,來形成一個(gè)個(gè)的打分項(xiàng)。 其次是如何去制定風(fēng)險(xiǎn)量化的標(biāo)準(zhǔn),也就是如何用各個(gè)指標(biāo)去構(gòu)造一個(gè)最佳實(shí)踐。這更像是一個(gè)數(shù)學(xué)建...
... return instance; } } 這種寫法用了兩個(gè)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(duì)第三種寫法的改進(jìn)。為什么要做兩次判斷呢?這是為了線程安全考慮,還是那個(gè)場(chǎng)景,對(duì)象還沒實(shí)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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