java.lang

Class InheritableThreadLocal<T>

java.lang.Object

java.lang.ThreadLocal<T>

java.lang.InheritableThreadLocal<T>

public class InheritableThreadLocal<T>
extends ThreadLocal<T>

A thread-local variable whose value is passed from parent to child thread. By default, the value of an inheritable thread-local variable of a child thread is initialized with the value of the parent thread's variable at thread creation time. However, subclasses may override {code #childValue(Object)} to provide an arbitrary function for passing the value of a parent's thread-local variable to the child's thread-local variable.

See Also:

Thread, ThreadLocal

Constructor Summary

Constructors

Constructor and Description
InheritableThreadLocal() Creates a new inheritable thread-local variable.

Method Summary

Modifier and Type	Method and Description
protected T	childValue(T parentValue) Computes the initial value of this thread-local variable for the child thread given the parent thread's value.

Methods inherited from class java.lang.ThreadLocal

get, initialValue, remove, set

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

InheritableThreadLocal

public InheritableThreadLocal()

Creates a new inheritable thread-local variable.

Method Detail

childValue

protected T childValue(T parentValue)

Computes the initial value of this thread-local variable for the child thread given the parent thread's value. Called from the parent thread when creating a child thread. The default implementation returns the parent thread's value.

Parameters:

parentValue - the value of the variable in the parent thread.

Returns:

the initial value of the variable for the child thread.