Mercurial > hg > blitz_stable
view src/com/go/trove/util/tq/TransactionQueueThreadTuner.java @ 32:243c74d599bf
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author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:41:47 +0100 |
parents | 3dc0c5604566 |
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/* ==================================================================== * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group * ==================================================================== * The Tea Software License, Version 1.1 * * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. 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. * * 3. The end-user documentation included with the redistribution, * if any, must include the following acknowledgment: * "This product includes software developed by the * Walt Disney Internet Group (http://opensource.go.com/)." * Alternately, this acknowledgment may appear in the software itself, * if and wherever such third-party acknowledgments normally appear. * * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must * not be used to endorse or promote products derived from this * software without prior written permission. For written * permission, please contact opensource@dig.com. * * 5. Products derived from this software may not be called "Tea", * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior * written permission of the Walt Disney Internet Group. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 WALT DISNEY INTERNET GROUP OR ITS * 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. * ==================================================================== * * For more information about Tea, please see http://opensource.go.com/. */ package com.go.trove.util.tq; /****************************************************************************** * Automatically tunes a TransactionQueue by dynamically adjusting the maximum * allowed number of worker threads. A TransactionQueueThreadTuner instance * should only be added to one TransactionQueue. * <p> * NOTE: The current implementation of TransactionQueueThreadTuner is * experimental and should not be used in production systems. * * @author Brian S O'Neill * @version * <!--$$Revision:--> 5 <!-- $-->, <!--$$JustDate:--> 9/25/00 <!-- $--> */ public class TransactionQueueThreadTuner extends TransactionQueueAdapter { private long mLastQueueTime; private long mLastServiceTime; private long mTotalQueueDelta; private long mTotalServiceDelta; private boolean mBaton; public synchronized void transactionDequeued(TransactionQueueEvent e) { long queueTime = e.getStageDuration(); mTotalQueueDelta += queueTime - mLastQueueTime; mLastQueueTime = queueTime; if (!mBaton) { mBaton = true; tune(e); } } public synchronized void transactionServiced(TransactionQueueEvent e) { long serviceTime = e.getStageDuration(); mTotalServiceDelta += serviceTime - mLastServiceTime; mLastServiceTime = serviceTime; if (mBaton) { mBaton = false; tune(e); } } private void tune(TransactionQueueEvent e) { if (mTotalQueueDelta > mTotalServiceDelta) { TransactionQueue queue = e.getTransactionQueue(); int maxThreads = queue.getMaximumThreads(); if (maxThreads <= queue.getThreadCount() * 2) { // Increase the maximum amount of threads. queue.setMaximumThreads(maxThreads + 1); } } else if (mTotalServiceDelta > mTotalQueueDelta) { TransactionQueue queue = e.getTransactionQueue(); int maxThreads = queue.getMaximumThreads(); if (maxThreads > 1) { // Decrease the maximum amount of threads. queue.setMaximumThreads(maxThreads - 1); } } } }