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代码建议:Lock的使用 #943

@237chenhao

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@237chenhao

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jdk源代码:
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阿里爸爸的码出高效里有提到这个问题.

为什么一开始就要去获取锁呢?
我的想法是先获取accessToken,如果获取不到或者已经过期,则再获取锁去刷新access_token.

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