InheritableThreadLocal的认识--一种可继承的ThreadLocal

最新推荐文章于 2025-03-22 13:24:57 发布

dididadabit

最新推荐文章于 2025-03-22 13:24:57 发布

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分类专栏： Java.lang.ThreadLocal 文章标签： variables inheritance thread function class user

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本文介绍了InheritableThreadLocal类，它是ThreadLocal的一种扩展，能够实现父线程到子线程的变量值继承。通常情况下，子线程的值会与父线程相同，但可以通过重写childValue方法来改变这一行为。

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InheritableThreadLocal的认识--一种可继承的ThreadLocal



java.lang.Object


--

----java.lang.ThreadLocal
<T>
------
java.lang.InheritableThreadLocal<T>


This class extends ThreadLocal
to provide inheritance of values from parent thread to child thread
: when a child thread is created, the child 
receives initial values for all inheritable thread-local variables for which theparent has values.

Normally the child's values will be identical （相同的）to the parent's; however , the child's value can be made an arbitrary（专断的，武断的，任意的） function of the parent's by overriding the childValue method in this class.

Inheritable thread-local variables are used in preference to ordinary thread-local variables when the per-thread-attribute being maintained in the variable (e.g., User ID, Transaction ID) must be automatically transmitted to any child threads that are created.