Mercurial > hg > blitz_stable

annotate src/com/go/trove/util/DeflaterPool.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /* ====================================================================
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2 * Trove - Copyright (c) 1997-2001 Walt Disney Internet Group
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3 * ====================================================================
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4 * The Tea Software License, Version 1.1
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5 *
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 *
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 *
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15 * 2. Redistributions in binary form must reproduce the above copyright
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16 * notice, this list of conditions and the following disclaimer in
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17 * the documentation and/or other materials provided with the
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18 * distribution.
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19 *
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20 * 3. The end-user documentation included with the redistribution,
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21 * if any, must include the following acknowledgment:
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22 * "This product includes software developed by the
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23 * Walt Disney Internet Group (http://opensource.go.com/)."
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24 * Alternately, this acknowledgment may appear in the software itself,
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25 * if and wherever such third-party acknowledgments normally appear.
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26 *
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
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28 * not be used to endorse or promote products derived from this
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29 * software without prior written permission. For written
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30 * permission, please contact opensource@dig.com.
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31 *
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32 * 5. Products derived from this software may not be called "Tea",
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
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35 * written permission of the Walt Disney Internet Group.
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36 *
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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48 * ====================================================================
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49 *
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50 * For more information about Tea, please see http://opensource.go.com/.
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51 */
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52
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53 package com.go.trove.util;
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54
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55 import java.util.*;
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56
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57 /******************************************************************************
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58 * Since {@link Deflater Deflaters} can be expensive to allocate, re-use them
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59 * with this pool.
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60 *
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61 * @author Brian S O'Neill
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62 * @version
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63 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/06/14 <!-- $-->
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64 */
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65 public class DeflaterPool {
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66 private static final int LIMIT;
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67
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68 private static List cPool;
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69 private static List cNoWrapPool;
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70
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71 static {
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72 LIMIT = Integer.getInteger("com.go.trove.util.DeflaterPool.LIMIT", 8).intValue();
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73 }
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74
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75 public static synchronized void clear() {
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76 if (cPool != null) {
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77 Iterator it = cPool.iterator();
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78 while (it.hasNext()) {
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79 ((Deflater)it.next()).end();
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80 }
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81 cPool = null;
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82 }
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83 if (cNoWrapPool != null) {
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84 Iterator it = cNoWrapPool.iterator();
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85 while (it.hasNext()) {
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86 ((Deflater)it.next()).end();
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87 }
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88 cNoWrapPool = null;
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89 }
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90 }
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91
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92 public static synchronized Deflater get(int level, boolean nowrap) {
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93 List pool;
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94
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95 if (nowrap) {
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96 if ((pool = cNoWrapPool) == null) {
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97 return new Deflater(level, true);
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98 }
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99 }
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100 else {
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101 if ((pool = cPool) == null) {
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102 return new Deflater(level, false);
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103 }
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104 }
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105
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106 if (pool.isEmpty()) {
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107 return new Deflater(level, nowrap);
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108 }
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109
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110 Deflater d = (Deflater)pool.remove(pool.size() - 1);
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111 d.setLevel(level);
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112 d.setStrategy(Deflater.DEFAULT_STRATEGY);
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113 return d;
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114 }
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115
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116 public static Deflater get(int level) {
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117 return get(level, false);
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118 }
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119
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120 public static Deflater get() {
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121 return get(Deflater.DEFAULT_COMPRESSION, false);
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122 }
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123
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124 public static synchronized void put(Deflater d) {
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125 d.reset();
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126 List pool;
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127
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128 if (d.isNoWrap()) {
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129 if ((pool = cNoWrapPool) == null) {
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130 pool = cNoWrapPool = new ArrayList(LIMIT);
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131 }
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132 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
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133 else {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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134 if ((pool = cPool) == null) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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135 pool = cPool = new ArrayList(LIMIT);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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136 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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137 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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138
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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139 if (pool.size() < LIMIT) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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140 pool.add(d);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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141 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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142 else {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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143 d.end();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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144 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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145 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
146 }