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60 lines
2.5 KiB
Java
60 lines
2.5 KiB
Java
/*
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* Copyright (c) 1997, 2002, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.awt;
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/**
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* An interface for events that know how to dispatch themselves.
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* By implementing this interface an event can be placed upon the event
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* queue and its {@code dispatch()} method will be called when the event
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* is dispatched, using the {@code EventDispatchThread}.
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* <p>
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* This is a very useful mechanism for avoiding deadlocks. If
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* a thread is executing in a critical section (i.e., it has entered
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* one or more monitors), calling other synchronized code may
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* cause deadlocks. To avoid the potential deadlocks, an
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* {@code ActiveEvent} can be created to run the second section of
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* code at later time. If there is contention on the monitor,
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* the second thread will simply block until the first thread
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* has finished its work and exited its monitors.
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* <p>
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* For security reasons, it is often desirable to use an {@code ActiveEvent}
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* to avoid calling untrusted code from a critical thread. For
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* instance, peer implementations can use this facility to avoid
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* making calls into user code from a system thread. Doing so avoids
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* potential deadlocks and denial-of-service attacks.
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*
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* @author Timothy Prinzing
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* @since 1.2
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*/
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public interface ActiveEvent {
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/**
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* Dispatch the event to its target, listeners of the events source,
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* or do whatever it is this event is supposed to do.
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*/
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public void dispatch();
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}
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