AWTAutoShutdown

Class Overview

This class is to let AWT shutdown automatically when a user is done with AWT. It tracks AWT state using the following parameters:

• peerMap - the map between the existing peer objects and their associated targets
• toolkitThreadBusy - whether the toolkit thread is waiting for a new native event to appear in its queue or is dispatching an event
• busyThreadSet - a set of all the event dispatch threads that are busy at this moment, i.e. those that are not waiting for a new event to appear in their event queue.

AWT is considered to be in ready-to-shutdown state when peerMap is empty and toolkitThreadBusy is false and busyThreadSet is empty. The internal AWTAutoShutdown logic secures that the single non-daemon thread (blockerThread) is running when AWT is not in ready-to-shutdown state. This blocker thread is to prevent AWT from exiting since the toolkit thread is now daemon and all the event dispatch threads are started only when needed. Once it is detected that AWT is in ready-to-shutdown state this blocker thread waits for a certain timeout and if AWT state doesn't change during timeout this blocker thread terminates all the event dispatch threads and exits.

Summary

[Expand] Inherited Methods
From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait() Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object. final void wait(long timeout, int nanos) Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed. final void wait(long timeout) Causes the current thread to wait until either another thread invokes the notify() method or the notifyAll() method for this object, or a specified amount of time has elapsed.
From interface java.lang.Runnable abstract void run() When an object implementing interface Runnable is used to create a thread, starting the thread causes the object's run method to be called in that separately executing thread.