Mercurial > hg > blitz_stable

annotate src/com/go/trove/net/InetAddressResolver.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) 1997-2000 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 }