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   1 /**********************************************************************
   2  * Copyright (c) 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *    IBM - Initial API and implementation
  10  **********************************************************************/
  11 package net.sourceforge.phpdt.monitor.core.internal;
  12
  13 import java.io.InterruptedIOException;
  14 import java.net.*;
  15
  16 import net.sourceforge.phpdt.monitor.core.IMonitor;
  17 /**
  18  * The actual TCP/IP monitoring server. This is a thread that
  19  * listens on a port and relays a call to another server.
  20  */
  21 public class AcceptThread {
  22         protected IMonitor monitor;
  23
  24         protected boolean alive = true;
  25         protected ServerSocket serverSocket;
  26
  27         protected Thread thread;
  28
  29         class ServerThread extends Thread {
  30                 /**
  31                  * Actual running of the server proxy.
  32                  */
  33            public void run() {
  34                    // create a new server socket
  35                    try {
  36                            serverSocket = new ServerSocket(monitor.getLocalPort());
  37                            serverSocket.setSoTimeout(2000);
  38
  39                            Trace.trace(Trace.FINEST, "Monitoring localhost:" + monitor.getLocalPort() + " -> " + monitor.getRemoteHost() + ":" + monitor.getRemotePort());
  40                    } catch (Exception e) {
  41                            Trace.trace(Trace.SEVERE, "Could not start monitoring");
  42                            return;
  43                    }
  44
  45                    while (alive) {
  46                            try {
  47                                    // accept the connection from the client
  48                                    Socket localSocket = serverSocket.accept();
  49
  50                                    // connect to the remote server
  51                                    Socket remoteSocket = new Socket(monitor.getRemoteHost(), monitor.getRemotePort());
  52
  53                                    // relay the call through
  54                                    ProtocolAdapter adapter = (ProtocolAdapter) monitor.getProtocolAdapter();
  55                                    adapter.parse(monitor, localSocket, remoteSocket);
  56                            } catch (InterruptedIOException e) {
  57                                 // do nothing
  58                            } catch (Exception e) {
  59                                    if (alive)
  60                                                 Trace.trace(Trace.SEVERE, "Error while monitoring", e);
  61                            }
  62                    }
  63            }
  64         }
  65
  66         /**
  67          * ServerMonitorThread constructor comment.
  68          */
  69         public AcceptThread(IMonitor monitor) {
  70                 super();
  71                 this.monitor = monitor;
  72         }
  73
  74         public void startServer() {
  75                 if (thread != null)
  76                         return;
  77                 thread = new ServerThread();
  78                 thread.setDaemon(true);
  79                 thread.start();
  80         }
  81
  82         public boolean isRunning() {
  83                 return (thread != null);
  84         }
  85
  86         /**
  87          * Correctly close the server socket and shut down the server.
  88          */
  89         public void stopServer() {
  90                 try {
  91                         alive = false;
  92                         thread = null;
  93                         serverSocket.close();
  94                 } catch (Exception e) {
  95                         Trace.trace(Trace.SEVERE, "Error stopping server", e);
  96                 }
  97         }
  98
  99         /**
 100          * Returns true if this port is in use.
 101          *
 102          * @return boolean
 103          * @param port int
 104          */
 105         public static boolean isPortInUse(int port) {
 106                 ServerSocket s = null;
 107                 try {
 108                         s = new ServerSocket(port);
 109                 } catch (SocketException e) {
 110                         return true;
 111                 } catch (Exception e) {
 112                         return true;
 113                 } finally {
 114                         if (s != null) {
 115                                 try {
 116                                         s.close();
 117                                 } catch (Exception e) { }
 118                         }
 119                 }
 120
 121                 return false;
 122         }
 123 }