/**

  * Licensed to the Apache Software Foundation (ASF) under one or more

  * contributor license agreements.  See the NOTICE file distributed with

  * this work for additional information regarding copyright ownership.

  * The ASF licenses this file to You under the Apache License, Version 2.0

  * (the "License"); you may not use this file except in compliance with

  * the License.  You may obtain a copy of the License at

  *

  *      http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.apache.xbean.terminal.telnet;

 import java.io.IOException;

 import java.net.ServerSocket;

 import java.net.Socket;

 public class TelnetDaemon implements Runnable {

     private final TelnetShell shell;

     private final int port;

     private ServerSocket serverSocket;

     /**

      * We start out in a "stopped" state until someone calls the start method.

      */

     private boolean stop = true;

     public TelnetDaemon(String serverName, int port) {

         this.port = port;

         this.shell = new TelnetShell(serverName);

     }

     public void start() throws Exception {

         synchronized (this) {

             // Don't bother if we are already started/starting

             if (!stop)

                 return;

             stop = false;

             // Do our stuff

             try {

                 serverSocket = new ServerSocket(port, 20);

                 Thread d = new Thread(this);

                 d.setName("service.shell@" + d.hashCode());

                 d.setDaemon(true);

                 d.start();

             } catch (Exception e) {

                 throw new Exception("Service failed to start.", e);

             }

         }

     }

     public void stop() throws Exception {

         synchronized (this) {

             if (stop) {

                 return;

             }

             stop = true;

             try {

                 this.notifyAll();

             } catch (Throwable t) {

                 t.printStackTrace();

             }

         }

     }

     public synchronized void service(final Socket socket) throws IOException {

         Thread d = new Thread(new Runnable() {

             public void run() {

                 try {

                     shell.service(socket);

                 } catch (SecurityException e) {

                 } catch (Throwable e) {

                 } finally {

                     try {

                         if (socket != null)

                             socket.close();

                     } catch (Throwable t) {

                     }

                 }

             }

         });

         d.setDaemon(true);

         d.start();

     }

     public void run() {

         Socket socket = null;

         while (!stop) {

             try {

                 socket = serverSocket.accept();

                 socket.setTcpNoDelay(true);

                 if (!stop) service(socket);

             } catch (SecurityException e) {

             } catch (Throwable e) {

             }

         }

     }

 }