// Copyright (C) 2003 - 2012 Philip Aston
   // All rights reserved.
   //
   // This file is part of The Grinder software distribution. Refer to
   // the file LICENSE which is part of The Grinder distribution for
   // licensing details. The Grinder distribution is available on the
   // Internet at http://grinder.sourceforge.net/
   //
   // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  // COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  // OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package net.grinder.communication;
  
  import java.net.InetAddress;
  import java.net.ServerSocket;
  import java.net.Socket;
  import java.net.UnknownHostException;
  
  
  /**
   * Active acceptor that accepts a single connection.
   */
  public final class SocketAcceptorThread extends Thread {
  
    private final ServerSocket m_serverSocket;
    private final int m_numberOfAccepts;
    private Exception m_exception;
    private Socket m_acceptedSocket;
  
    public static SocketAcceptorThread create() throws Exception {
      final SocketAcceptorThread acceptor = new SocketAcceptorThread(1);
      acceptor.start();
      return acceptor;
    }
  
    private SocketAcceptorThread(int numberOfAccepts) throws Exception {
      m_serverSocket = new ServerSocket(0);
      m_numberOfAccepts = numberOfAccepts;
    }
  
    public void run() {
      try {
        for (int i=0; i<m_numberOfAccepts; ++i) {
          m_acceptedSocket = m_serverSocket.accept();
        }
      }
      catch (Exception e) {
        m_exception = e;
      }
    }
  
    public String getHostName() throws UnknownHostException {
      return InetAddress.getByName(null).getHostName();
    }
  
    public int getPort() {
      return m_serverSocket.getLocalPort();
    }
  
    public Socket getAcceptedSocket() {
      return m_acceptedSocket;
    }
  
    public final void close() throws Exception {
  
      join();
  
      if (m_exception != null) {
        throw m_exception;
      }
  
      m_serverSocket.close();
    }
  }