Mercurial > hg > blitz_stable
diff src/com/go/trove/util/DeflaterPool.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/com/go/trove/util/DeflaterPool.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,146 @@ +/* ==================================================================== + * Trove - Copyright (c) 1997-2001 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; + +import java.util.*; + +/****************************************************************************** + * Since {@link Deflater Deflaters} can be expensive to allocate, re-use them + * with this pool. + * + * @author Brian S O'Neill + * @version + * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/06/14 <!-- $--> + */ +public class DeflaterPool { + private static final int LIMIT; + + private static List cPool; + private static List cNoWrapPool; + + static { + LIMIT = Integer.getInteger("com.go.trove.util.DeflaterPool.LIMIT", 8).intValue(); + } + + public static synchronized void clear() { + if (cPool != null) { + Iterator it = cPool.iterator(); + while (it.hasNext()) { + ((Deflater)it.next()).end(); + } + cPool = null; + } + if (cNoWrapPool != null) { + Iterator it = cNoWrapPool.iterator(); + while (it.hasNext()) { + ((Deflater)it.next()).end(); + } + cNoWrapPool = null; + } + } + + public static synchronized Deflater get(int level, boolean nowrap) { + List pool; + + if (nowrap) { + if ((pool = cNoWrapPool) == null) { + return new Deflater(level, true); + } + } + else { + if ((pool = cPool) == null) { + return new Deflater(level, false); + } + } + + if (pool.isEmpty()) { + return new Deflater(level, nowrap); + } + + Deflater d = (Deflater)pool.remove(pool.size() - 1); + d.setLevel(level); + d.setStrategy(Deflater.DEFAULT_STRATEGY); + return d; + } + + public static Deflater get(int level) { + return get(level, false); + } + + public static Deflater get() { + return get(Deflater.DEFAULT_COMPRESSION, false); + } + + public static synchronized void put(Deflater d) { + d.reset(); + List pool; + + if (d.isNoWrap()) { + if ((pool = cNoWrapPool) == null) { + pool = cNoWrapPool = new ArrayList(LIMIT); + } + } + else { + if ((pool = cPool) == null) { + pool = cPool = new ArrayList(LIMIT); + } + } + + if (pool.size() < LIMIT) { + pool.add(d); + } + else { + d.end(); + } + } +}