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comparison src/com/go/trove/util/DeflaterPool.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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1 /* ====================================================================
2 * Trove - Copyright (c) 1997-2001 Walt Disney Internet Group
3 * ====================================================================
4 * The Tea Software License, Version 1.1
5 *
6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. The end-user documentation included with the redistribution,
21 * if any, must include the following acknowledgment:
22 * "This product includes software developed by the
23 * Walt Disney Internet Group (http://opensource.go.com/)."
24 * Alternately, this acknowledgment may appear in the software itself,
25 * if and wherever such third-party acknowledgments normally appear.
26 *
27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
28 * not be used to endorse or promote products derived from this
29 * software without prior written permission. For written
30 * permission, please contact opensource@dig.com.
31 *
32 * 5. Products derived from this software may not be called "Tea",
33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
35 * written permission of the Walt Disney Internet Group.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 * For more information about Tea, please see http://opensource.go.com/.
51 */
52
53 package com.go.trove.util;
54
55 import java.util.*;
56
57 /******************************************************************************
58 * Since {@link Deflater Deflaters} can be expensive to allocate, re-use them
59 * with this pool.
60 *
61 * @author Brian S O'Neill
62 * @version
63 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/06/14 <!-- $-->
64 */
65 public class DeflaterPool {
66 private static final int LIMIT;
67
68 private static List cPool;
69 private static List cNoWrapPool;
70
71 static {
72 LIMIT = Integer.getInteger("com.go.trove.util.DeflaterPool.LIMIT", 8).intValue();
73 }
74
75 public static synchronized void clear() {
76 if (cPool != null) {
77 Iterator it = cPool.iterator();
78 while (it.hasNext()) {
79 ((Deflater)it.next()).end();
80 }
81 cPool = null;
82 }
83 if (cNoWrapPool != null) {
84 Iterator it = cNoWrapPool.iterator();
85 while (it.hasNext()) {
86 ((Deflater)it.next()).end();
87 }
88 cNoWrapPool = null;
89 }
90 }
91
92 public static synchronized Deflater get(int level, boolean nowrap) {
93 List pool;
94
95 if (nowrap) {
96 if ((pool = cNoWrapPool) == null) {
97 return new Deflater(level, true);
98 }
99 }
100 else {
101 if ((pool = cPool) == null) {
102 return new Deflater(level, false);
103 }
104 }
105
106 if (pool.isEmpty()) {
107 return new Deflater(level, nowrap);
108 }
109
110 Deflater d = (Deflater)pool.remove(pool.size() - 1);
111 d.setLevel(level);
112 d.setStrategy(Deflater.DEFAULT_STRATEGY);
113 return d;
114 }
115
116 public static Deflater get(int level) {
117 return get(level, false);
118 }
119
120 public static Deflater get() {
121 return get(Deflater.DEFAULT_COMPRESSION, false);
122 }
123
124 public static synchronized void put(Deflater d) {
125 d.reset();
126 List pool;
127
128 if (d.isNoWrap()) {
129 if ((pool = cNoWrapPool) == null) {
130 pool = cNoWrapPool = new ArrayList(LIMIT);
131 }
132 }
133 else {
134 if ((pool = cPool) == null) {
135 pool = cPool = new ArrayList(LIMIT);
136 }
137 }
138
139 if (pool.size() < LIMIT) {
140 pool.add(d);
141 }
142 else {
143 d.end();
144 }
145 }
146 }