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lichriszhang avatar lichriszhang commented on May 23, 2024

针对jdk8的处理，虽然方法名是computeIfAbsent，但内部调用还是putIfAbsent

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looly avatar looly commented on May 23, 2024

@lichriszhang sorry，我这边测试没有切换JDK导致的。

为了解决恶心的JDK-8161372死循环问题，不得不改造这个方法。

确实改造后由于非原子可能造成对象重复创建的问题。

不过我觉得这个重复创建并不影响最终单例对象的唯一性。

可以看下MapUtil.computeIfAbsentForJdk8方法：

image

步骤1中创建了对象，步骤2会重复判断，判断有值后会抛弃创建的对象。

也就是说，为了解决这个bug并照顾到性能问题，退而求其次选择了这个方案。

JDK9+无此问题。

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