/*************************************************************************
* Copyright 2009-2015 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
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* POSSIBILITY OF SUCH DAMAGE. USERS OF THIS SOFTWARE ACKNOWLEDGE
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* COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS SOFTWARE,
* AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
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* WHICH IN THE REGENTS' DISCRETION MAY INCLUDE, WITHOUT LIMITATION,
* REPLACEMENT OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO
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* NEEDED TO COMPLY WITH ANY SUCH LICENSES OR RIGHTS.
************************************************************************/
package com.eucalyptus.blockstorage.threadpool;
import java.util.List;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.log4j.Logger;
import com.eucalyptus.blockstorage.Storage;
import com.eucalyptus.blockstorage.async.SnapshotCreator;
import com.eucalyptus.blockstorage.exceptions.ThreadPoolNotInitializedException;
import com.eucalyptus.system.Threads;
public class SnapshotThreadPool {
private static Logger LOG = Logger.getLogger(SnapshotThreadPool.class);
private static ThreadPoolExecutor pool;
private static final ReentrantLock RLOCK = new ReentrantLock();
private SnapshotThreadPool() {}
public static void initialize(Integer poolSize) {
RLOCK.lock();
try {
shutdown();
LOG.info("Initializing SC thread pool catering to snapshot creation");
pool =
new ThreadPoolExecutor(poolSize, poolSize, 10, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>(), Threads.lookup(Storage.class,
SnapshotCreator.class), new ThreadPoolExecutor.AbortPolicy());
} finally {
RLOCK.unlock();
}
}
public static void add(SnapshotCreator task) throws ThreadPoolNotInitializedException {
if (pool != null && !pool.isShutdown()) {
pool.execute(task);
} else {
LOG.warn("SC thread pool catering to snapshot creation is either not initalized or shut down");
throw new ThreadPoolNotInitializedException("SC thread pool catering to snapshot creation is either not initalized or shut down");
}
}
public static Integer getPoolSize() {
if (pool != null && !pool.isShutdown()) {
return pool.getCorePoolSize();
} else {
return null;
}
}
public static void updatePoolSize(Integer newSize) {
if (pool != null && !pool.isShutdown() && newSize != null && pool.getCorePoolSize() != newSize) {
pool.setCorePoolSize(newSize);
pool.setMaximumPoolSize(newSize);
} else {
// nothing to do here
}
}
public static void shutdown() {
RLOCK.lock();
try {
if (pool != null) {
LOG.info("Shutting down SC thread pool catering to snapshot creation");
LOG.debug("Number of snapshots in progress on block storage backend: " + pool.getActiveCount());
List<Runnable> awaitingExecution = pool.shutdownNow();
LOG.debug("Number of queued snapshots for block storage backend: " + awaitingExecution.size());
pool = null;
}
} finally {
RLOCK.unlock();
}
}
}