serialportio.java

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// $Id: SerialPortIO.java,v 1.2 2003/10/07 21:46:03 idgay Exp $

/*									tab:4
 * "Copyright (c) 2000-2003 The Regents of the University  of California.  
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written agreement is
 * hereby granted, provided that the above copyright notice, the following
 * two paragraphs and the author appear in all copies of this software.
 * 
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
 * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 *
 * Copyright (c) 2002-2003 Intel Corporation
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached INTEL-LICENSE     
 * file. If you do not find these files, copies can be found by writing to
 * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA, 
 * 94704.  Attention:  Intel License Inquiry.
 */


/**
 * File: SerialPortIO.java
 *
 * Description:
 * The SerialPortIO handles the collection of packets
 * from a mote connected to the serial port.  The Constructor
 * takes in an already open input stream from which to read
 * data.
 *
 * @author <a href="mailto:[e-mail]">Bret Hull</a>
 */

package net.tinyos.sf.old;

import java.util.*;
import java.io.*;

public class SerialPortIO extends Thread {
    private Vector                m_vctPSForwarders = new Vector ();
    private boolean               m_bShutdown     = false;
    private boolean               m_bTerminated   = false;
    int                           m_nBytes        = 0;
    private DataSource            m_dataSource    = null;
    private SerialForward sf;

    public SerialPortIO(SerialForward SF){sf=SF;}

    public void RegisterPacketForwarder (ClientServicer cs) {
        if (sf.InitSerialPortIO()) {
            RegisterPSForwarder(cs);
        }
    }

    public void UnregisterPacketForwarder (ClientServicer cs) {
        UnregisterPSForwarder(cs);
    }

    public void WriteBytes (byte[] data) {
        if (sf.InitSerialPortIO()) {
            WriteToSource(data);
        }
    }

    public void run () {
        sf.VERBOSE ("SerialPortIO: initializing");
	m_dataSource = sf.dataSource;

	if (m_dataSource != null) {
	    boolean bStatus;
	    byte[] packet;

	    bStatus = m_dataSource.OpenSource();
            if (!bStatus && !m_bShutdown) { 
		sf.VERBOSE("Unable to open data source");
	    }
	    
	    while (!m_bShutdown && bStatus) {
		packet = m_dataSource.ReadPacket();
		if (packet != null) {
		    UpdatePacketForwarders (packet);
		}
		else {
                    m_dataSource.CloseSource();
                    m_bShutdown = true;
		}
	    }
	}
	else {
            sf.VERBOSE ("SerialPortIO: no data source selected");
	}
	
        sf.VERBOSE ("SerialPortIO: closing data source");
        sf.serialPortIO = null;
    }

    private void ReadFileData () {
        /*ObjectInputStream ois = (ObjectInputStream) m_is;
        Object currentPckt;
        Object lastPckt = null;

        while (!m_bShutdown)
        {
            try { currentPckt = ois.readObject(); }
            catch (Exception e)
            {
                m_bShutdown = true;
                continue;
            }

            if (currentPckt instanceof DataPckt)
            {
                SerialForward.settings.nBytesRead += ((DataPckt) currentPckt).data.length;
                if (lastPckt == null)
                {
                  UpdatePacketForwarders (((DataPckt) currentPckt).data);
                }
                else
                {
                  SimulatePcktDelay ((DataPckt) currentPckt, (DataPckt) lastPckt);
                  UpdatePacketForwarders (((DataPckt) currentPckt).data);
                }
                lastPckt = currentPckt;
            }
        }*/
    }
/*
    private void SimulatePcktDelay (DataPckt currentPckt, DataPckt lastPckt)
    {
        long timeDelta = currentPckt.time.getTime() - lastPckt.time.getTime();
        if (timeDelta < 0) { return; }
        else
        {
            try { this.sleep(timeDelta); }
            catch (InterruptedException e) { }
        }
    }
*/
    public void Shutdown () {
        if (sf.serialPortIO != null) {
            sf.serialPortIO.Terminate();
        }
    }

    private void Terminate () {
        if (!m_bTerminated) {
            m_bTerminated = true;
            m_bShutdown = true;

            this.interrupt();
            //m_dataSource.CloseSource();
            sf.serialPortIO = null;
        }
    }
    private synchronized void RegisterPSForwarder (ClientServicer cs) {
        m_vctPSForwarders.addElement (cs);
        sf.IncrementClients();
        sf.DEBUG ("SerialPortIO: Added listener to position: " + m_vctPSForwarders.size());
    }



    private synchronized void UnregisterPSForwarder (ClientServicer cs)  {
        sf.DEBUG ("SerialPortIO: Removing packet stream forwarder");
        UnregisterForwarder (cs, m_vctPSForwarders);
    }

    private void UnregisterForwarder (ClientServicer cs, Vector vct) {

        if (!vct.removeElement(cs)) {
          sf.DEBUG ("Unable to unregister listener");
          return;
        }
	// we always want to read from port even if we
	// have no clients...cause jason says so
	/*
        if (m_vctPSForwarders.isEmpty() && !m_bSourceSim)
        {
            // no more forwarders, shutdown
            m_bShutdown = true;
	}*/

    }

    private synchronized void UpdatePacketForwarders (byte[] packet)
    {
        sf.IncrementPacketsRead ();
        ClientServicer currentCS;

	if (SerialForward.debugMode) {
	  String s = "Forwarding packet: ";
	  for (int i = 0; i < packet.length; i++) {
	    s += Integer.toHexString(packet[i] & 0xff) + " ";
	  }
	  sf.VERBOSE(s);
	}


        for (int i = 0; i < m_vctPSForwarders.size(); i++) {
            currentCS = (ClientServicer) m_vctPSForwarders.elementAt(i);
	    sf.DEBUG("Forwarding packet to "+currentCS);
            try { currentCS.output.write(packet); }
            catch (IOException e) {
                currentCS.Shutdown ();
                i--;
            }
        }
	/*
        if (m_vctPSForwarders.size() == 0)
        {
            m_bShutdown = true;
	    }*/
    }

    private boolean WriteToSource (byte[] packet) {
        if (m_dataSource != null) {
            m_dataSource.WritePacket(packet);
        }
        return true;
    }

}