Use is subject to License Terms. Your use of this web site or any of its content or software indicates your agreement to be bound by these License Terms.

Copyright © 2006 Sun Microsystems, Inc. All rights reserved.

JSR 216 (Maintenance Release)

java.lang
Class InheritableThreadLocal

java.lang.Object
  extended byjava.lang.ThreadLocal
      extended byjava.lang.InheritableThreadLocal

public class InheritableThreadLocal
extends ThreadLocal

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.

Since:
1.2
See Also:
ThreadLocal

Constructor Summary
InheritableThreadLocal()
           
 
Method Summary
protected  Object childValue(Object 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.
 
Methods inherited from class java.lang.ThreadLocal
get, initialValue, set
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

InheritableThreadLocal

public InheritableThreadLocal()
Method Detail

childValue

protected Object childValue(Object 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 - the parent thread's value
Returns:
the child thread's initial value

JSR 216 (Maintenance Release)

Copyright © 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to License Terms. Your use of this web site or any of its content or software indicates your agreement to be bound by these License Terms.

For more information, please consult the JSR 216 specification.