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InheritableThreadLocal

public class InheritableThreadLocal
extends ThreadLocal<T>

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 the parent has values. Normally the child's values will be identical to the parent's; however, the child's value can be made an arbitrary 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.

See also:

Summary

Public constructors

InheritableThreadLocal()

Protected methods

T childValue(T parentValue)

Computes the child's initial value for this inheritable thread-local variable as a function of the parent's value at the time the child thread is created.

Inherited methods

From class java.lang.ThreadLocal
From class java.lang.Object

Public constructors

InheritableThreadLocal

Added in API level 1
InheritableThreadLocal ()

Protected methods

childValue

Added in API level 1
T childValue (T parentValue)

Computes the child's initial value for this inheritable thread-local variable as a function of the parent's value at the time the child thread is created. This method is called from within the parent thread before the child is started.

This method merely returns its input argument, and should be overridden if a different behavior is desired.

Parameters
parentValue T: the parent thread's value
Returns
T the child thread's initial value
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