public class InheritableThreadLocal<T> extends ThreadLocal<T>
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
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.
Note: During the creation of a new
thread, it is
possible to opt out of receiving initial values for inheritable
|Modifier and Type
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.
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
This method merely returns its input argument, and should be overridden if a different behavior is desired.
parentValue - the parent thread's value
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