Mercurial > hg > blitz_condensed
annotate src/com/go/trove/util/Utils.java @ 34:6f68e94c1fb8 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) 1997-2000 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 import java.io.Serializable; |
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57 import java.io.ObjectStreamException; |
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58 import java.lang.reflect.InvocationTargetException; |
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59 import java.lang.reflect.Method; |
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60 import java.lang.ref.Reference; |
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61 import java.lang.ref.WeakReference; |
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62 |
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63 /****************************************************************************** |
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64 * Some generic utilities. |
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65 * |
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66 * @author Brian S O'Neill |
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67 * @version |
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68 * <!--$$Revision:--> 28 <!-- $-->, <!--$$JustDate:--> 00/12/18 <!-- $--> |
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69 * @see java.util.Collections |
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70 */ |
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71 public class Utils { |
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72 // The choice of determining whether these constants are public or |
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73 // private is based on the design of the java.util.Collections class. |
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74 // For consistency, the "empty" fields are public, and the comparators are |
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75 // accessed from static methods. |
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76 |
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77 public static final Enumeration EMPTY_ENUMERATION = new EmptyEnum(); |
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78 |
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79 /** This Map is already provided in JDK1.3. */ |
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80 public static final Map EMPTY_MAP = new EmptyMap(); |
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81 |
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82 /** |
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83 * Similar to EMPTY_MAP, except the put operation is supported, but the |
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84 * values are immediately forgotten. |
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85 */ |
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86 public static final Map VOID_MAP = new VoidMap(); |
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87 |
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88 private static final Comparator NULL_LOW_ORDER = new NullLowOrder(); |
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89 |
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90 private static final Comparator NULL_HIGH_ORDER = new NullHighOrder(); |
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91 |
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92 private static final Comparator NULL_EQUAL_ORDER = new NullEqualOrder(); |
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93 |
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94 private static FlyweightSet cFlyweightSet; |
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95 |
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96 /** |
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97 * Returns a Comparator that uses a Comparable object's natural ordering, |
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98 * except null values are always considered low order. This Comparator |
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99 * allows naturally ordered TreeMaps to support null values. |
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100 */ |
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101 public static Comparator nullLowOrder() { |
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102 return NULL_LOW_ORDER; |
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103 } |
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104 |
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105 /** |
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106 * Returns a Comparator that wraps the given Comparator except null values |
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107 * are always considered low order. This fixes Comparators that don't |
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108 * support comparisons against null and allows them to be used in TreeMaps. |
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109 */ |
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110 public static Comparator nullLowOrder(Comparator c) { |
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111 return new NullLowOrderC(c); |
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112 } |
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113 |
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114 /** |
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115 * Returns a Comparator that uses a Comparable object's natural ordering, |
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116 * except null values are always considered high order. This Comparator |
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117 * allows naturally ordered TreeMaps to support null values. |
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118 */ |
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119 public static Comparator nullHighOrder() { |
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120 return NULL_HIGH_ORDER; |
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121 } |
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122 |
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123 /** |
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124 * Returns a Comparator that wraps the given Comparator except null values |
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125 * are always considered high order. This fixes Comparators that don't |
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126 * support comparisons against null and allows them to be used in TreeMaps. |
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127 */ |
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128 public static Comparator nullHighOrder(Comparator c) { |
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129 return new NullHighOrderC(c); |
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130 } |
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131 |
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132 /** |
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133 * Returns a Comparator that uses a Comparable object's natural ordering, |
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134 * except null values are always considered equal order. This Comparator |
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135 * should not be used in a TreeMap, but can be used in a sorter. |
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136 */ |
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137 public static Comparator nullEqualOrder() { |
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138 return NULL_EQUAL_ORDER; |
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139 } |
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140 |
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141 /** |
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142 * Returns a Comparator that wraps the given Comparator except null values |
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143 * are always considered equal order. This Comparator should not be used in |
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144 * a TreeMap, but can be used in a sorter. |
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145 */ |
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146 public static Comparator nullEqualOrder(Comparator c) { |
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147 return new NullEqualOrderC(c); |
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148 } |
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149 |
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150 /** |
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151 * Returns a Comparator that wraps the given Comparator, but orders in |
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152 * reverse. |
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153 */ |
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154 public static Comparator reverseOrder(Comparator c) { |
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155 return new ReverseOrderC(c); |
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156 } |
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157 |
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158 /** |
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159 * Just like {@link String#intern() String.intern}, except it generates |
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160 * flyweights for any kind of object, and it does not prevent them from |
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161 * being garbage collected. Calling intern on a String does not use the |
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162 * same String pool used by String.intern because those Strings are not |
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163 * always garbage collected. Some virtual machines free up Strings from the |
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164 * interned String pool, others do not. |
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165 * <p> |
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166 * For objects that do not customize the hashCode and equals methods, |
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167 * calling intern is not very useful because the object returned will |
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168 * always be the same as the one passed in. |
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169 * <p> |
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170 * The object type returned from intern is guaranteed to be exactly the |
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171 * same type as the one passed in. Calling intern on null returns null. |
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172 * |
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173 * @param obj Object to intern |
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174 * @return Interned object. |
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175 * @see FlyweightSet |
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176 */ |
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177 public static Object intern(Object obj) { |
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178 FlyweightSet set; |
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179 if ((set = cFlyweightSet) == null) { |
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180 synchronized (Utils.class) { |
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181 if ((set = cFlyweightSet) == null) { |
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182 set = new FlyweightSet(); |
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183 } |
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184 } |
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185 cFlyweightSet = set; |
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186 } |
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187 return set.put(obj); |
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188 } |
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189 |
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190 protected Utils() { |
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191 } |
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192 |
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193 private static class EmptyEnum implements Enumeration, Serializable { |
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194 public boolean hasMoreElements() { |
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195 return false; |
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196 } |
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197 |
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198 public Object nextElement() throws NoSuchElementException { |
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199 throw new NoSuchElementException(); |
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200 } |
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201 |
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202 // Serializable singleton classes should always do this. |
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203 private Object readResolve() throws ObjectStreamException { |
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204 return EMPTY_ENUMERATION; |
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205 } |
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206 }; |
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207 |
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208 private static class EmptyMap implements Map, Serializable { |
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209 public int size() { |
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210 return 0; |
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211 } |
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212 |
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213 public boolean isEmpty() { |
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214 return true; |
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215 } |
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216 |
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217 public boolean containsKey(Object key) { |
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218 return false; |
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219 } |
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220 |
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221 public boolean containsValue(Object value) { |
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222 return false; |
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223 } |
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224 |
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225 public Object get(Object key) { |
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226 return null; |
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227 } |
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228 |
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229 public Object put(Object key, Object value) { |
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230 throw new UnsupportedOperationException |
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231 ("Cannot put into immutable empty map"); |
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232 } |
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233 |
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234 public Object remove(Object key) { |
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235 return null; |
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236 } |
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237 |
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238 public void putAll(Map map) { |
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239 throw new UnsupportedOperationException |
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240 ("Cannot put into immutable empty map"); |
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241 } |
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242 |
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243 public void clear() { |
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244 } |
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245 |
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246 public Set keySet() { |
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247 return Collections.EMPTY_SET; |
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248 } |
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249 |
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250 public Collection values() { |
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251 return Collections.EMPTY_LIST; |
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252 } |
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253 |
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254 public Set entrySet() { |
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255 return Collections.EMPTY_SET; |
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256 } |
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257 |
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258 // Serializable singleton classes should always do this. |
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259 private Object readResolve() throws ObjectStreamException { |
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260 return EMPTY_MAP; |
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261 } |
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262 } |
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263 |
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264 private static class VoidMap extends EmptyMap { |
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265 public Object put(Object key, Object value) { |
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266 return null; |
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267 } |
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268 |
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269 public void putAll(Map map) { |
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270 } |
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271 |
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272 // Serializable singleton classes should always do this. |
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273 private Object readResolve() throws ObjectStreamException { |
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274 return VOID_MAP; |
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275 } |
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276 } |
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277 |
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278 private static class NullLowOrder implements Comparator, Serializable { |
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279 public int compare(Object obj1, Object obj2) { |
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280 if (obj1 != null) { |
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281 return (obj2 != null) ? ((Comparable)obj1).compareTo(obj2) : 1; |
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282 } |
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283 else { |
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284 return (obj2 != null) ? -1 : 0; |
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285 } |
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286 } |
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287 |
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288 // Serializable singleton classes should always do this. |
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289 private Object readResolve() throws ObjectStreamException { |
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290 return NULL_LOW_ORDER; |
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291 } |
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292 } |
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293 |
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294 private static class NullLowOrderC implements Comparator, Serializable { |
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295 private Comparator c; |
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296 |
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297 public NullLowOrderC(Comparator c) { |
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298 this.c = c; |
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299 } |
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300 |
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301 public int compare(Object obj1, Object obj2) { |
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302 if (obj1 != null) { |
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303 return (obj2 != null) ? c.compare(obj1, obj2) : 1; |
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304 } |
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305 else { |
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306 return (obj2 != null) ? -1 : 0; |
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307 } |
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308 } |
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309 } |
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310 |
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311 private static class NullHighOrder implements Comparator, Serializable { |
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312 public int compare(Object obj1, Object obj2) { |
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313 if (obj1 != null) { |
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314 return (obj2 != null) ? ((Comparable)obj1).compareTo(obj2): -1; |
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315 } |
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316 else { |
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317 return (obj2 != null) ? 1 : 0; |
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318 } |
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319 } |
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320 |
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321 // Serializable singleton classes should always do this. |
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322 private Object readResolve() throws ObjectStreamException { |
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323 return NULL_HIGH_ORDER; |
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324 } |
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325 } |
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326 |
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327 private static class NullHighOrderC implements Comparator, Serializable { |
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328 private Comparator c; |
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329 |
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330 public NullHighOrderC(Comparator c) { |
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331 this.c = c; |
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332 } |
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333 |
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334 public int compare(Object obj1, Object obj2) { |
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335 if (obj1 != null) { |
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336 return (obj2 != null) ? c.compare(obj1, obj2) : -1; |
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337 } |
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338 else { |
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339 return (obj2 != null) ? 1 : 0; |
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340 } |
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341 } |
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342 } |
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343 |
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344 private static class NullEqualOrder implements Comparator, Serializable { |
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345 public int compare(Object obj1, Object obj2) { |
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346 return (obj1 != null && obj2 != null) ? |
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347 ((Comparable)obj1).compareTo(obj2) : 0; |
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348 } |
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349 |
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350 // Serializable singleton classes should always do this. |
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351 private Object readResolve() throws ObjectStreamException { |
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352 return NULL_EQUAL_ORDER; |
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353 } |
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354 } |
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355 |
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356 private static class NullEqualOrderC implements Comparator, Serializable { |
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357 private Comparator c; |
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358 |
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359 public NullEqualOrderC(Comparator c) { |
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360 this.c = c; |
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361 } |
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362 |
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363 public int compare(Object obj1, Object obj2) { |
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364 return (obj1 != null && obj2 != null) ? c.compare(obj1, obj2) : 0; |
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365 } |
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366 } |
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367 |
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368 private static class ReverseOrderC implements Comparator, Serializable { |
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369 private Comparator c; |
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370 |
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Dan Creswell <dan.creswell@gmail.com>
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371 public ReverseOrderC(Comparator c) { |
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372 this.c = c; |
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373 } |
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374 |
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Dan Creswell <dan.creswell@gmail.com>
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375 public int compare(Object obj1, Object obj2) { |
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376 return c.compare(obj2, obj1); |
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377 } |
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378 } |
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379 } |