Android Open Source - ubihelper Http Listener

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Back to project page ubihelper.

License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Copyright (c) 2012 The University of Nottingham
 * //from   w  w w  . j a va2 s .co  m
 * This file is part of ubihelper
 *
 *  ubihelper is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  ubihelper is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with ubihelper. If not, see <http://www.gnu.org/licenses/>.
 *  
 *  @author Chris Greenhalgh (cmg@cs.nott.ac.uk), The University of Nottingham
 */

package uk.ac.horizon.ubihelper.httpserver;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

import uk.ac.horizon.ubihelper.service.Service;

import android.util.Log;

/**
 * @author cmg
 *
 */
public class HttpListener extends Thread {
  private static final String TAG = "ubihelper-http";
  private Service service;
  private int port;
  private ServerSocket socket = null;
  private boolean stopped;
  /** cons */
  public HttpListener(Service service, int port) {
    this.service = service;
    this.port = port;
  }
  /** stop */
  public synchronized void close() {
    stopped = true;
    this.interrupt();
    closeInternal();
  }
  /** set port */
  public synchronized void setPort(int port) {
    this.port = port;
    this.interrupt();
    closeInternal();
  }
  /** run */
  public void run() {
    Log.d(TAG,"Started thread");
    while (!stopped) {
      // may interrupt...
      try {
        ServerSocket ss = null;
        synchronized (this) {
          if (socket!=null && socket.getLocalPort()!=port) 
            closeInternal();
          if (socket==null) {
            try {
              socket = new ServerSocket(port);
              Log.d(TAG,"Opened server socket on port "+socket.getLocalPort());
            }
            catch (IOException e) {
              Log.e(TAG,"Unable to open server socket on port "+port+": "+e.getMessage());
              // TODO notification
              // delay to avoid racing...
              // NB holding lock!
              wait(1000);
            }
          }
          // clone reference in critical section!
          ss = socket;
        }
        if (ss!=null)
          try {
            // may have been closed concurrently, so don't worry too much
            Socket s = ss.accept();
            handleClient(s);
          } catch (IOException e) {
            Log.e(TAG,"Error in accept: "+e.getMessage());
            closeInternal();
          }
      }
      catch (InterruptedException ie) {
        // round the loop...
        Log.d(TAG,"interrupted");
      }
    }
    closeInternal();
    Log.d(TAG,"Exited thread");
  }
  
  private void handleClient(Socket s) {
    Log.d(TAG,"New client at "+s.getRemoteSocketAddress().toString()+":"+s.getPort());
    new HttpClientHandler(service, s).start();
  }
  /** close internal */
  private synchronized void closeInternal() {
    if (socket!=null) {
      Log.d(TAG,"Close socket on port "+socket.getLocalPort());
      try {
        socket.close();
      }
      catch (IOException e) {
        Log.e(TAG,"Error closing socket: "+e.getMessage());
      }
      socket = null;
    }
  }
}

Java Source Code List

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