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ExtensionLoader类获取实现类的时候,为什么要加双重锁 #67
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那下面没有判断的话,另外的第一个拿到锁的执行完后,下一个在等待获取锁的是不是也会再执行一边代码 |
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第一个锁已经锁住了下面的代码了
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