Mercurial > hg > blitz_stable
annotate src/com/go/trove/util/DeflaterPool.java @ 35:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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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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133 else { |
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134 if ((pool = cPool) == null) { |
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135 pool = cPool = new ArrayList(LIMIT); |
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136 } |
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137 } |
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138 |
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139 if (pool.size() < LIMIT) { |
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140 pool.add(d); |
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141 } |
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142 else { |
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143 d.end(); |
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144 } |
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145 } |
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146 } |