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Showing content from https://docs.oracle.com/en/java/javase/19/docs/api/java.base/java/lang/InheritableThreadLocal.html below:

InheritableThreadLocal (Java SE 19 & JDK 19)

Type Parameters:

T - the type of the inheritable thread local's value

This class extends

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 thread-local variables.

Since:

1.2

See Also:

• ThreadLocal
• Thread.Builder.inheritInheritableThreadLocals(boolean)^PREVIEW

• Constructor Summary

  Constructors

  Creates an inheritable thread local variable.

• Method Summary

  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 declared in class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Constructor Details
  • InheritableThreadLocal

    public InheritableThreadLocal()

    Creates an inheritable thread local variable.

• Method Details
  • childValue protected T childValue(T parentValue)

    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

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