/*************************************************************************
* Copyright 2009-2012 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
* Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
* CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
* additional information or have any questions.
*
* This file may incorporate work covered under the following copyright
* and permission notice:
*
* Software License Agreement (BSD License)
*
* Copyright (c) 2008, Regents of the University of California
* All rights reserved.
*
* Redistribution and use of this software in source and binary forms,
* with or without modification, are permitted provided that the
* following conditions are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE. USERS OF THIS SOFTWARE ACKNOWLEDGE
* THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE LICENSED MATERIAL,
* COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS SOFTWARE,
* AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
* IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA,
* SANTA BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY,
* WHICH IN THE REGENTS' DISCRETION MAY INCLUDE, WITHOUT LIMITATION,
* REPLACEMENT OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO
* IDENTIFIED, OR WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT
* NEEDED TO COMPLY WITH ANY SUCH LICENSES OR RIGHTS.
************************************************************************/
package com.eucalyptus.bootstrap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.PriorityBlockingQueue;
import org.apache.log4j.Logger;
import com.eucalyptus.component.ComponentId;
import com.eucalyptus.component.ComponentIds;
import com.eucalyptus.util.Exceptions;
/**
* Executes shutdown hooks in order
*/
public class OrderedShutdown {
static Logger LOG = Logger.getLogger( OrderedShutdown.class );
static LinkedBlockingQueue<ShutdownHook> preShutdownHooks = new LinkedBlockingQueue<ShutdownHook>();
static PriorityBlockingQueue<ShutdownHook> shutdownHooks = new PriorityBlockingQueue<ShutdownHook>();
static LinkedBlockingQueue<ShutdownHook> postShutdownHooks = new LinkedBlockingQueue<ShutdownHook>();
public static <T extends ComponentId> void registerShutdownHook(Class<T> id, Runnable r) {
ShutdownHook hook = new ShutdownHook(ComponentIds.lookup(id), r);
shutdownHooks.offer(hook);
}
public static void registerPreShutdownHook(Runnable r) {
ShutdownHook hook = new ShutdownHook(r);
preShutdownHooks.offer(hook);
}
public static void registerPostShutdownHook(Runnable r) {
ShutdownHook hook = new ShutdownHook(r);
postShutdownHooks.offer(hook);
}
public static void initialize() {
Runtime.getRuntime().addShutdownHook(new Thread( "bootstrap-ordered-shutdown-hook" ) {
@Override
public void run() {
int shutdownChecks = 0;
while ( !Bootstrap.isShuttingDown( ) && shutdownChecks++<10 ) {
LOG.info( "Waiting for shutdown to be marked..." );
try {
Thread.sleep( 500 );
} catch ( InterruptedException e ) {
}
}
LOG.info("Executing Pre-Shutdown Hooks...");
ShutdownHook prehook;
while((prehook = preShutdownHooks.poll()) != null) {
try {
LOG.info("Executing Pre-Shutdown Hook: " + prehook.getRunnable( ) );
prehook.getRunnable().run();
} catch (Exception e) {
Exceptions.maybeInterrupted(e);
}
}
LOG.info("Executing Shutdown Hooks...");
ShutdownHook h;
while((h = shutdownHooks.poll()) != null) {
try {
LOG.info("Executing Shutdown Hook: " + h.getRunnable( ) );
h.getRunnable().run();
} catch (Exception e) {
Exceptions.maybeInterrupted(e);
}
}
LOG.info("Executing Post-Shutdown Hooks...");
ShutdownHook posthook;
while((posthook = postShutdownHooks.poll()) != null) {
try {
LOG.info("Executing Post-Shutdown Hook: " + posthook.getRunnable( ) );
posthook.getRunnable().run();
} catch (Exception e) {
Exceptions.maybeInterrupted(e);
}
}
LOG.info("Executed Post-Shutdown Hooks.");
try { // sleep to allow log output
Thread.sleep( 50 );
} catch ( InterruptedException e ) {
}
}
});
}
}