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annotate src/org/eclipse/jetty/server/ShutdownMonitor.java @ 848:22a4e93ed20e

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 16:38:36 -0600
parents 3428c60d7cfc
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.server;
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20
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21 import java.io.IOException;
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22 import java.io.InputStreamReader;
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23 import java.io.LineNumberReader;
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24 import java.io.OutputStream;
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25 import java.net.InetAddress;
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26 import java.net.ServerSocket;
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27 import java.net.Socket;
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28 import java.util.Properties;
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29
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30 import org.eclipse.jetty.util.StringUtil;
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31 import org.eclipse.jetty.util.thread.ShutdownThread;
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32
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33 /**
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34 * Shutdown/Stop Monitor thread.
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35 * <p>
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36 * This thread listens on the port specified by the STOP.PORT system parameter (defaults to -1 for not listening) for request authenticated with the key given
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37 * by the STOP.KEY system parameter (defaults to "eclipse") for admin requests.
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38 * <p>
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39 * If the stop port is set to zero, then a random port is assigned and the port number is printed to stdout.
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40 * <p>
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41 * Commands "stop" and "status" are currently supported.
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42 */
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43 public class ShutdownMonitor
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44 {
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45 // Implementation of safe lazy init, using Initialization on Demand Holder technique.
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46 static class Holder
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47 {
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48 static ShutdownMonitor instance = new ShutdownMonitor();
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49 }
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50
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51 public static ShutdownMonitor getInstance()
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52 {
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53 return Holder.instance;
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54 }
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55
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56 /**
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57 * ShutdownMonitorThread
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58 *
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59 * Thread for listening to STOP.PORT for command to stop Jetty.
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60 * If ShowndownMonitor.exitVm is true, then Sytem.exit will also be
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61 * called after the stop.
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62 *
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63 */
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64 public class ShutdownMonitorThread extends Thread
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65 {
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66
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67 public ShutdownMonitorThread ()
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68 {
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69 setDaemon(true);
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70 setName("ShutdownMonitor");
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71 }
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72
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73 @Override
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74 public void run()
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75 {
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76 if (serverSocket == null)
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77 {
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78 return;
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79 }
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80
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81 while (serverSocket != null)
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82 {
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83 Socket socket = null;
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84 try
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85 {
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86 socket = serverSocket.accept();
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87
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88 LineNumberReader lin = new LineNumberReader(new InputStreamReader(socket.getInputStream()));
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89 String receivedKey = lin.readLine();
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90 if (!key.equals(receivedKey))
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91 {
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92 System.err.println("Ignoring command with incorrect key");
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93 continue;
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94 }
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95
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96 OutputStream out = socket.getOutputStream();
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97
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98 String cmd = lin.readLine();
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99 debug("command=%s",cmd);
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100 if ("stop".equals(cmd))
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101 {
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102 // Graceful Shutdown
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103 debug("Issuing graceful shutdown..");
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104 ShutdownThread.getInstance().run();
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105
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106 // Reply to client
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107 debug("Informing client that we are stopped.");
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108 out.write("Stopped\r\n".getBytes(StringUtil.__UTF8));
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109 out.flush();
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110
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111 // Shutdown Monitor
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112 debug("Shutting down monitor");
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113 close(socket);
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114 socket = null;
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115 close(serverSocket);
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116 serverSocket = null;
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117
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118 if (exitVm)
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119 {
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120 // Kill JVM
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121 debug("Killing JVM");
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122 System.exit(0);
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123 }
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124 }
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125 else if ("status".equals(cmd))
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126 {
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127 // Reply to client
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128 out.write("OK\r\n".getBytes(StringUtil.__UTF8));
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129 out.flush();
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130 }
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131 }
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132 catch (Exception e)
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133 {
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134 debug(e);
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135 System.err.println(e.toString());
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136 }
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137 finally
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138 {
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139 close(socket);
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140 socket = null;
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141 }
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142 }
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143 }
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144
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145 public void start()
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146 {
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147 if (isAlive())
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148 {
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149 System.err.printf("ShutdownMonitorThread already started");
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150 return; // cannot start it again
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151 }
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152
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153 startListenSocket();
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154
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155 if (serverSocket == null)
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156 {
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157 return;
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158 }
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159 if (DEBUG)
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160 System.err.println("Starting ShutdownMonitorThread");
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161 super.start();
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162 }
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163
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164 private void startListenSocket()
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165 {
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166 if (port < 0)
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167 {
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168 if (DEBUG)
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169 System.err.println("ShutdownMonitor not in use (port < 0): " + port);
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170 return;
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171 }
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172
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173 try
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174 {
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175 serverSocket = new ServerSocket(port,1,InetAddress.getByName("127.0.0.1"));
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176 if (port == 0)
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177 {
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178 // server assigned port in use
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179 port = serverSocket.getLocalPort();
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180 System.out.printf("STOP.PORT=%d%n",port);
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181 }
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182
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183 if (key == null)
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184 {
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185 // create random key
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186 key = Long.toString((long)(Long.MAX_VALUE * Math.random() + this.hashCode() + System.currentTimeMillis()),36);
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187 System.out.printf("STOP.KEY=%s%n",key);
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188 }
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189 }
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190 catch (Exception e)
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191 {
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192 debug(e);
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193 System.err.println("Error binding monitor port " + port + ": " + e.toString());
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194 serverSocket = null;
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195 }
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196 finally
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197 {
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198 // establish the port and key that are in use
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199 debug("STOP.PORT=%d",port);
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200 debug("STOP.KEY=%s",key);
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201 debug("%s",serverSocket);
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202 }
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203 }
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204
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205 }
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206
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207 private boolean DEBUG;
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208 private int port;
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209 private String key;
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210 private boolean exitVm;
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211 private ServerSocket serverSocket;
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212 private ShutdownMonitorThread thread;
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213
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214
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215
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216 /**
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217 * Create a ShutdownMonitor using configuration from the System properties.
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218 * <p>
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219 * <code>STOP.PORT</code> = the port to listen on (empty, null, or values less than 0 disable the stop ability)<br>
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220 * <code>STOP.KEY</code> = the magic key/passphrase to allow the stop (defaults to "eclipse")<br>
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221 * <p>
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222 * Note: server socket will only listen on localhost, and a successful stop will issue a System.exit() call.
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223 */
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224 private ShutdownMonitor()
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225 {
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226 Properties props = System.getProperties();
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227
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228 this.DEBUG = props.containsKey("DEBUG");
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229
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230 // Use values passed thru via /jetty-start/
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231 this.port = Integer.parseInt(props.getProperty("STOP.PORT","-1"));
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232 this.key = props.getProperty("STOP.KEY",null);
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233 this.exitVm = true;
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234 }
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235
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236 private void close(ServerSocket server)
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237 {
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238 if (server == null)
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239 {
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240 return;
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241 }
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242
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243 try
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244 {
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245 server.close();
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246 }
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247 catch (IOException ignore)
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248 {
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249 /* ignore */
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250 }
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251 }
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252
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253 private void close(Socket socket)
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254 {
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255 if (socket == null)
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256 {
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257 return;
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258 }
3428c60d7cfc replace jetty jars with source
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259
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parents:
diff changeset
260 try
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261 {
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262 socket.close();
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263 }
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diff changeset
264 catch (IOException ignore)
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265 {
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266 /* ignore */
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267 }
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268 }
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269
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270 private void debug(String format, Object... args)
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271 {
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272 if (DEBUG)
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273 {
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274 System.err.printf("[ShutdownMonitor] " + format + "%n",args);
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275 }
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276 }
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277
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diff changeset
278 private void debug(Throwable t)
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279 {
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280 if (DEBUG)
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281 {
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282 t.printStackTrace(System.err);
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283 }
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284 }
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285
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286 public String getKey()
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287 {
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288 return key;
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289 }
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290
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291 public int getPort()
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292 {
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293 return port;
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294 }
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295
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296 public ServerSocket getServerSocket()
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297 {
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298 return serverSocket;
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299 }
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300
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diff changeset
301 public boolean isExitVm()
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302 {
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303 return exitVm;
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diff changeset
304 }
3428c60d7cfc replace jetty jars with source
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305
3428c60d7cfc replace jetty jars with source
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diff changeset
306
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diff changeset
307 public void setDebug(boolean flag)
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308 {
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diff changeset
309 this.DEBUG = flag;
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310 }
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311
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312 public void setExitVm(boolean exitVm)
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313 {
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314 synchronized (this)
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315 {
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diff changeset
316 if (thread != null && thread.isAlive())
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317 {
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318 throw new IllegalStateException("ShutdownMonitorThread already started");
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319 }
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diff changeset
320 this.exitVm = exitVm;
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diff changeset
321 }
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322 }
3428c60d7cfc replace jetty jars with source
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diff changeset
323
3428c60d7cfc replace jetty jars with source
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diff changeset
324 public void setKey(String key)
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diff changeset
325 {
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
326 synchronized (this)
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diff changeset
327 {
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diff changeset
328 if (thread != null && thread.isAlive())
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parents:
diff changeset
329 {
3428c60d7cfc replace jetty jars with source
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diff changeset
330 throw new IllegalStateException("ShutdownMonitorThread already started");
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parents:
diff changeset
331 }
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diff changeset
332 this.key = key;
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parents:
diff changeset
333 }
3428c60d7cfc replace jetty jars with source
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diff changeset
334 }
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
335
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
336 public void setPort(int port)
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parents:
diff changeset
337 {
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parents:
diff changeset
338 synchronized (this)
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parents:
diff changeset
339 {
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
340 if (thread != null && thread.isAlive())
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
341 {
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
342 throw new IllegalStateException("ShutdownMonitorThread already started");
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
343 }
3428c60d7cfc replace jetty jars with source
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diff changeset
344 this.port = port;
3428c60d7cfc replace jetty jars with source
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345 }
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346 }
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347
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348 protected void start() throws Exception
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349 {
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350 ShutdownMonitorThread t = null;
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351 synchronized (this)
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352 {
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353 if (thread != null && thread.isAlive())
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354 {
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355 System.err.printf("ShutdownMonitorThread already started");
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356 return; // cannot start it again
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357 }
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358
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359 thread = new ShutdownMonitorThread();
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360 t = thread;
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361 }
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362
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363 if (t != null)
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364 t.start();
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365 }
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366
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367
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368 protected boolean isAlive ()
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369 {
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370 boolean result = false;
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371 synchronized (this)
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372 {
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373 result = (thread != null && thread.isAlive());
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374 }
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375 return result;
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376 }
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377
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378
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379 @Override
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380 public String toString()
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381 {
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382 return String.format("%s[port=%d]",this.getClass().getName(),port);
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383 }
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384 }