Mercurial > hg > blitz_condensed
annotate src/com/go/trove/net/InetAddressResolver.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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rev | line source |
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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.net; |
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54 |
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55 import java.net.*; |
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56 import java.util.*; |
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57 import java.lang.ref.*; |
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58 import com.go.trove.util.SoftHashMap; |
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59 |
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60 /****************************************************************************** |
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61 * Allows network host names to resolve to inet addresses via event |
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62 * notification. |
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63 * <p> |
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64 * Note: This class makes use of the java.util.Timer class, available only in |
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65 * Java 2, version 1.3. |
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66 * |
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67 * @author Brian S O'Neill |
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68 * @version |
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69 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/01/23 <!-- $--> |
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70 */ |
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71 public class InetAddressResolver { |
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72 // Wait for 10 minutes before trying to resolve again. |
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73 private static final long RESOLVE_PERIOD = 10 * 60 * 1000; |
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74 private static Timer cResolveTimer; |
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75 |
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76 private static Map cResolvers = new SoftHashMap(); |
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77 |
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78 private static Timer getResolveTimer() { |
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79 Timer timer = cResolveTimer; |
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80 if (timer == null) { |
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81 timer = new Timer(true); |
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82 timer.schedule(new TimerTask() { |
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83 public void run() { |
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84 Thread.currentThread().setName("InetAddressResolver"); |
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85 } |
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86 }, 0); |
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87 cResolveTimer = timer; |
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88 } |
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89 return timer; |
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90 } |
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91 |
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92 /** |
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93 * Resolve the host name into InetAddresses and listen for changes. |
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94 * The caller must save a reference to the resolver to prevent it from |
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95 * being reclaimed by the garbage collector. |
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96 * |
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97 * @param host host to resolve into InetAddresses |
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98 * @param listener listens for InetAddresses |
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99 */ |
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100 public static InetAddressResolver listenFor(String host, |
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101 InetAddressListener listener) { |
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102 synchronized (cResolvers) { |
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103 InetAddressResolver resolver = |
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104 (InetAddressResolver)cResolvers.get(host); |
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105 if (resolver == null) { |
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106 resolver = new InetAddressResolver(host); |
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107 cResolvers.put(host, resolver); |
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108 } |
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109 resolver.addListener(listener); |
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110 return resolver; |
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111 } |
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112 } |
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113 |
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114 private final String mHost; |
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115 |
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116 private List mListeners = new ArrayList(); |
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117 |
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118 // Is either an instance of UnknownHostException or InetAddress[]. |
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119 private Object mResolutionResults; |
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120 |
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121 private InetAddressResolver(String host) { |
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122 mHost = host; |
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123 |
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124 // Initial delay is random so that requests against other hosts are |
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125 // staggered. |
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126 long delay = (long)(Math.random() * RESOLVE_PERIOD); |
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127 getResolveTimer().schedule(new Resolver(this), delay, RESOLVE_PERIOD); |
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128 } |
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129 |
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130 private synchronized void addListener(InetAddressListener listener) { |
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131 mListeners.add(listener); |
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132 if (!resolveAddresses()) { |
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133 // Ensure that new listener is called the first time. |
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134 notifyListener(listener); |
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135 } |
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136 } |
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137 |
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138 private synchronized void notifyListener(InetAddressListener listener) { |
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139 if (mResolutionResults instanceof UnknownHostException) { |
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140 listener.unknown((UnknownHostException)mResolutionResults); |
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141 } |
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142 else { |
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143 InetAddress[] addresses = (InetAddress[])mResolutionResults; |
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144 addresses = (InetAddress[])addresses.clone(); |
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145 listener.resolved(addresses); |
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146 } |
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147 } |
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148 |
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149 // Returns true if anything changed from the last time this was invoked. |
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150 private synchronized boolean resolveAddresses() { |
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151 boolean changed; |
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152 try { |
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153 InetAddress[] addresses = InetAddress.getAllByName(mHost); |
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154 if (mResolutionResults instanceof UnknownHostException) { |
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155 changed = true; |
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156 } |
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157 else { |
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158 // Results may be ordered differently, so keep them sorted. |
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159 Arrays.sort(addresses, new Comparator() { |
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160 public int compare(Object a, Object b) { |
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161 return ((InetAddress)a).getHostAddress() |
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162 .compareTo(((InetAddress)b).getHostAddress()); |
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163 } |
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164 }); |
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165 |
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166 changed = !Arrays.equals |
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167 (addresses, (InetAddress[])mResolutionResults); |
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168 } |
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169 mResolutionResults = addresses; |
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170 } |
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171 catch (UnknownHostException e) { |
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172 changed = !(mResolutionResults instanceof UnknownHostException); |
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173 mResolutionResults = e; |
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174 } |
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175 |
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176 if (changed) { |
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177 int size = mListeners.size(); |
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178 for (int i=0; i<size; i++) { |
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179 notifyListener((InetAddressListener)mListeners.get(i)); |
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180 } |
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181 } |
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182 |
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183 return changed; |
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184 } |
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185 |
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186 private class Resolver extends TimerTask { |
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187 // Weakly references owner so that the timer won't prevent it from |
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188 // being garbage collected. |
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189 private final Reference mOwner; |
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190 |
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191 public Resolver(InetAddressResolver owner) { |
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192 mOwner = new WeakReference(owner); |
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193 } |
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194 |
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195 public void run() { |
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196 InetAddressResolver owner = (InetAddressResolver)mOwner.get(); |
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197 if (owner == null) { |
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198 cancel(); |
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199 } |
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200 Thread t = Thread.currentThread(); |
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201 String originalName = t.getName(); |
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202 t.setName("InetAddressResolver:" + owner.mHost); |
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203 try { |
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204 owner.resolveAddresses(); |
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205 } |
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206 finally { |
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207 t.setName(originalName); |
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208 } |
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209 } |
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210 } |
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211 } |