- * 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 by the STOP.KEY system parameter (defaults to "eclipse") for admin requests. + * 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 + * by the STOP.KEY system parameter (defaults to "eclipse") for admin requests. *
* If the stop port is set to zero, then a random port is assigned and the port number is printed to stdout. *
@@ -42,90 +42,74 @@ import org.eclipse.jetty.util.thread.ShutdownThread; */ public class ShutdownMonitor extends Thread { - private static final ShutdownMonitor INSTANCE = new ShutdownMonitor(); - + // Implementation of safe lazy init, using Initialization on Demand Holder technique. + static class Holder + { + static ShutdownMonitor instance = new ShutdownMonitor(); + } + public static ShutdownMonitor getInstance() { - return INSTANCE; + return Holder.instance; } - - private final boolean DEBUG; - private final int port; - private final String key; - private final ServerSocket serverSocket; + private boolean DEBUG; + private int port; + private String key; + private boolean exitVm; + private ServerSocket serverSocket; + + /** + * Create a ShutdownMonitor using configuration from the System properties. + *
+ * STOP.PORT = the port to listen on (empty, null, or values less than 0 disable the stop ability)
+ * STOP.KEY = the magic key/passphrase to allow the stop (defaults to "eclipse")
+ *
+ * Note: server socket will only listen on localhost, and a successful stop will issue a System.exit() call. + */ private ShutdownMonitor() { Properties props = System.getProperties(); - // Use the same debug option as /jetty-start/ this.DEBUG = props.containsKey("DEBUG"); - - // Use values passed thru /jetty-start/ - int stopPort = Integer.parseInt(props.getProperty("STOP.PORT","-1")); - String stopKey = props.getProperty("STOP.KEY",null); - ServerSocket sock = null; + // Use values passed thru via /jetty-start/ + this.port = Integer.parseInt(props.getProperty("STOP.PORT","-1")); + this.key = props.getProperty("STOP.KEY","eclipse"); + this.exitVm = true; + } + + private void close(ServerSocket server) + { + if (server == null) + { + return; + } try { - if (stopPort < 0) - { - System.out.println("ShutdownMonitor not in use"); - sock = null; - return; - } - - setDaemon(true); - setName("ShutdownMonitor"); - - sock = new ServerSocket(stopPort,1,InetAddress.getByName("127.0.0.1")); - if (stopPort == 0) - { - // server assigned port in use - stopPort = sock.getLocalPort(); - System.out.printf("STOP.PORT=%d%n",stopPort); - } - - if (stopKey == null) - { - // create random key - stopKey = Long.toString((long)(Long.MAX_VALUE * Math.random() + this.hashCode() + System.currentTimeMillis()),36); - System.out.printf("STOP.KEY=%s%n",stopKey); - } - + server.close(); } - catch (Exception e) + catch (IOException ignore) { - debug(e); - System.err.println("Error binding monitor port " + stopPort + ": " + e.toString()); + /* ignore */ } - finally - { - // establish the port and key that are in use - this.port = stopPort; - this.key = stopKey; - - this.serverSocket = sock; - debug("STOP.PORT=%d", port); - debug("STOP.KEY=%s", key); - debug("%s", serverSocket); - } - - this.start(); - } - - @Override - public String toString() - { - return String.format("%s[port=%d]",this.getClass().getName(),port); } - private void debug(Throwable t) + private void close(Socket socket) { - if (DEBUG) + if (socket == null) { - t.printStackTrace(System.err); + return; + } + + try + { + socket.close(); + } + catch (IOException ignore) + { + /* ignore */ } } @@ -137,9 +121,42 @@ public class ShutdownMonitor extends Thread } } + private void debug(Throwable t) + { + if (DEBUG) + { + t.printStackTrace(System.err); + } + } + + public String getKey() + { + return key; + } + + public int getPort() + { + return port; + } + + public ServerSocket getServerSocket() + { + return serverSocket; + } + + public boolean isExitVm() + { + return exitVm; + } + @Override public void run() { + if (serverSocket == null) + { + return; + } + while (true) { Socket socket = null; @@ -169,15 +186,18 @@ public class ShutdownMonitor extends Thread debug("Informing client that we are stopped."); out.write("Stopped\r\n".getBytes(StringUtil.__UTF8)); out.flush(); - + // Shutdown Monitor debug("Shutting down monitor"); close(socket); close(serverSocket); - // Kill JVM - debug("Killing JVM"); - System.exit(0); + if (exitVm) + { + // Kill JVM + debug("Killing JVM"); + System.exit(0); + } } else if ("status".equals(cmd)) { @@ -199,37 +219,99 @@ public class ShutdownMonitor extends Thread } } - private void close(Socket socket) + public void setDebug(boolean flag) { - if (socket == null) + this.DEBUG = flag; + } + + public void setExitVm(boolean exitVm) + { + if (isAlive()) { + throw new IllegalStateException("ShutdownMonitor already started"); + } + this.exitVm = exitVm; + } + + public void setKey(String key) + { + if (isAlive()) + { + throw new IllegalStateException("ShutdownMonitor already started"); + } + this.key = key; + } + + public void setPort(int port) + { + if (isAlive()) + { + throw new IllegalStateException("ShutdownMonitor already started"); + } + this.port = port; + } + + public void start() + { + if (isAlive()) + { + System.out.printf("ShutdownMonitor already started"); + return; // cannot start it again + } + startListenSocket(); + if (serverSocket == null) + { + return; + } + + super.start(); + } + + private void startListenSocket() + { + if (this.port < 0) + { + System.out.println("ShutdownMonitor not in use (port < 0): " + port); return; } try { - socket.close(); + setDaemon(true); + setName("ShutdownMonitor"); + + this.serverSocket = new ServerSocket(this.port,1,InetAddress.getByName("127.0.0.1")); + if (this.port == 0) + { + // server assigned port in use + this.port = serverSocket.getLocalPort(); + System.out.printf("STOP.PORT=%d%n",this.port); + } + + if (this.key == null) + { + // create random key + this.key = Long.toString((long)(Long.MAX_VALUE * Math.random() + this.hashCode() + System.currentTimeMillis()),36); + System.out.printf("STOP.KEY=%s%n",this.key); + } } - catch (IOException ignore) + catch (Exception e) { - /* ignore */ + debug(e); + System.err.println("Error binding monitor port " + this.port + ": " + e.toString()); + } + finally + { + // establish the port and key that are in use + debug("STOP.PORT=%d",this.port); + debug("STOP.KEY=%s",this.key); + debug("%s",serverSocket); } } - - private void close(ServerSocket server) - { - if (server == null) - { - return; - } - try - { - server.close(); - } - catch (IOException ignore) - { - /* ignore */ - } + @Override + public String toString() + { + return String.format("%s[port=%d]",this.getClass().getName(),port); } }