org.eclipse.jdt.debug/jdi/org/eclipse/jdi/internal/connect/PacketSendManager.java

/*******************************************************************************
 * Copyright (c) 2000, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdi.internal.connect;

import java.io.IOException;
import java.io.InterruptedIOException;
import com.ibm.icu.text.MessageFormat;
import java.util.LinkedList;

import org.eclipse.jdi.internal.jdwp.JdwpPacket;

import com.sun.jdi.VMDisconnectedException;
import com.sun.jdi.connect.spi.Connection;

/**
 * This class implements a thread that sends available packets to the Virtual Machine.
 *
 */
public class PacketSendManager extends PacketManager {
	/** List of packets to be sent to Virtual Machine */
	private LinkedList fOutgoingPackets;

	/** 
	 * Create a new thread that send packets to the Virtual Machine.
	 */
	public PacketSendManager(Connection connection) {
		super(connection);
		fOutgoingPackets = new LinkedList();
	}

	
    public void disconnectVM() {
        super.disconnectVM();
        synchronized (fOutgoingPackets) {
            fOutgoingPackets.notifyAll();
        }
    }
    
	/** 
	 * Thread's run method.
	 */
	public void run() {
		while (!VMIsDisconnected()) {
			try {
				sendAvailablePackets();
			}
			//in each case if the remote VM fails, or has been interrupted, disconnect and force a clean up, don't wait for it to happen
			catch (InterruptedException e) {disconnectVM();} 
			catch (InterruptedIOException e) {disconnectVM(e);} 
			catch (IOException e) {disconnectVM(e);}
		}
	}
	
	/** 
	 * Add a packet to be sent to the Virtual Machine.
	 */
	public void sendPacket(JdwpPacket packet) {
		if (VMIsDisconnected()) {
			String message;
			if (getDisconnectException() == null) {
				message= ConnectMessages.PacketSendManager_Got_IOException_from_Virtual_Machine_1; 
			}
			else {
				String exMessage = getDisconnectException().getMessage();
				if (exMessage == null) {
					message= MessageFormat.format(ConnectMessages.PacketSendManager_Got__0__from_Virtual_Machine_1, new String[] {getDisconnectException().getClass().getName()}); 
				}
				else {
					message= MessageFormat.format(ConnectMessages.PacketSendManager_Got__0__from_Virtual_Machine___1__1, new String[] {getDisconnectException().getClass().getName(), exMessage}); 
				}
			}
			throw new VMDisconnectedException(message);
		}
		
		synchronized(fOutgoingPackets) {
		// Add packet to list of packets to send.
			fOutgoingPackets.add(packet);
		// Notify PacketSendThread that data is available.
			fOutgoingPackets.notifyAll();
		}
	}
	
	/** 
	 * Send available packets to the Virtual Machine.
	 */
	private void sendAvailablePackets() throws InterruptedException, IOException {
	    LinkedList packetsToSend = new LinkedList();
	    synchronized (fOutgoingPackets) {
			while (fOutgoingPackets.size() == 0) {
				fOutgoingPackets.wait();
			}
			packetsToSend.addAll(fOutgoingPackets);
			fOutgoingPackets.clear();
        }

		// Put available packets on Output Stream.
		while (packetsToSend.size() > 0) {
			// Note that only JdwpPackets are added to the list, so a ClassCastException can't occur.
			JdwpPacket packet = (JdwpPacket)packetsToSend.removeFirst();			
			byte[] bytes = packet.getPacketAsBytes();
			getConnection().writePacket(bytes);
		}
	}
}