001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.xbean.terminal.telnet; 018 019 import java.io.IOException; 020 import java.net.ServerSocket; 021 import java.net.Socket; 022 023 public class TelnetDaemon implements Runnable { 024 025 private final TelnetShell shell; 026 private final int port; 027 028 private ServerSocket serverSocket; 029 030 /** 031 * We start out in a "stopped" state until someone calls the start method. 032 */ 033 private boolean stop = true; 034 035 public TelnetDaemon(String serverName, int port) { 036 this.port = port; 037 this.shell = new TelnetShell(serverName); 038 } 039 040 public void start() throws Exception { 041 synchronized (this) { 042 // Don't bother if we are already started/starting 043 if (!stop) 044 return; 045 046 stop = false; 047 048 // Do our stuff 049 try { 050 serverSocket = new ServerSocket(port, 20); 051 Thread d = new Thread(this); 052 d.setName("service.shell@" + d.hashCode()); 053 d.setDaemon(true); 054 d.start(); 055 } catch (Exception e) { 056 throw new Exception("Service failed to start.", e); 057 } 058 } 059 } 060 061 public void stop() throws Exception { 062 synchronized (this) { 063 if (stop) { 064 return; 065 } 066 stop = true; 067 try { 068 this.notifyAll(); 069 } catch (Throwable t) { 070 t.printStackTrace(); 071 } 072 } 073 } 074 075 public synchronized void service(final Socket socket) throws IOException { 076 Thread d = new Thread(new Runnable() { 077 public void run() { 078 try { 079 shell.service(socket); 080 } catch (SecurityException e) { 081 } catch (Throwable e) { 082 } finally { 083 try { 084 if (socket != null) 085 socket.close(); 086 } catch (Throwable t) { 087 } 088 } 089 } 090 }); 091 d.setDaemon(true); 092 d.start(); 093 } 094 095 public void run() { 096 097 Socket socket = null; 098 099 while (!stop) { 100 try { 101 socket = serverSocket.accept(); 102 socket.setTcpNoDelay(true); 103 if (!stop) service(socket); 104 } catch (SecurityException e) { 105 } catch (Throwable e) { 106 } 107 } 108 } 109 110 }