author | mchung |
Thu, 12 Mar 2009 10:27:22 -0700 | |
changeset 2277 | 445a331b4a8b |
parent 2 | 90ce3da70b43 |
child 2703 | acd4d6a53e3e |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2005-2006 Sun Microsystems, Inc. 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. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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package java.lang; |
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import java.util.*; |
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/* |
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* Class to track and run user level shutdown hooks registered through |
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* <tt>{@link Runtime#addShutdownHook Runtime.addShutdownHook}</tt>. |
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* |
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* @see java.lang.Runtime#addShutdownHook |
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* @see java.lang.Runtime#removeShutdownHook |
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*/ |
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class ApplicationShutdownHooks { |
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static { |
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Shutdown.add(1 /* shutdown hook invocation order */, |
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new Runnable() { |
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public void run() { |
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runHooks(); |
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} |
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}); |
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} |
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/* The set of registered hooks */ |
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private static IdentityHashMap<Thread, Thread> hooks = new IdentityHashMap<Thread, Thread>(); |
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private ApplicationShutdownHooks() {} |
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/* Add a new shutdown hook. Checks the shutdown state and the hook itself, |
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* but does not do any security checks. |
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*/ |
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static synchronized void add(Thread hook) { |
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if(hooks == null) |
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throw new IllegalStateException("Shutdown in progress"); |
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if (hook.isAlive()) |
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throw new IllegalArgumentException("Hook already running"); |
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if (hooks.containsKey(hook)) |
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throw new IllegalArgumentException("Hook previously registered"); |
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hooks.put(hook, hook); |
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} |
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/* Remove a previously-registered hook. Like the add method, this method |
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* does not do any security checks. |
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*/ |
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static synchronized boolean remove(Thread hook) { |
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if(hooks == null) |
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throw new IllegalStateException("Shutdown in progress"); |
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if (hook == null) |
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throw new NullPointerException(); |
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return hooks.remove(hook) != null; |
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} |
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/* Iterates over all application hooks creating a new thread for each |
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* to run in. Hooks are run concurrently and this method waits for |
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* them to finish. |
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*/ |
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static void runHooks() { |
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Collection<Thread> threads; |
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synchronized(ApplicationShutdownHooks.class) { |
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threads = hooks.keySet(); |
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hooks = null; |
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} |
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for (Thread hook : threads) { |
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hook.start(); |
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} |
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for (Thread hook : threads) { |
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try { |
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hook.join(); |
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} catch (InterruptedException x) { } |
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} |
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} |
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} |