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/***************************************************************************
* Copyright (c) 2004, 2005, 2006 Eike Stepper, Germany.
* 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:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.internal.net4j.transport.tcp;
import org.eclipse.net4j.transport.Buffer;
import org.eclipse.net4j.util.concurrent.Synchronizer;
import org.eclipse.net4j.util.concurrent.SynchronizingCorrelator;
import org.eclipse.net4j.util.om.trace.ContextTracer;
import org.eclipse.internal.net4j.bundle.Net4j;
import org.eclipse.internal.net4j.transport.BufferUtil;
import org.eclipse.internal.net4j.transport.ChannelImpl;
import java.nio.ByteBuffer;
/**
* @author Eike Stepper
*/
public final class ControlChannelImpl extends ChannelImpl
{
public static final short CONTROL_CHANNEL_ID = -1;
public static final long REGISTRATION_TIMEOUT = 500000;
public static final byte OPCODE_REGISTRATION = 1;
public static final byte OPCODE_REGISTRATION_ACK = 2;
public static final byte OPCODE_DEREGISTRATION = 3;
public static final byte SUCCESS = 1;
public static final byte FAILURE = 0;
private static final ContextTracer TRACER = new ContextTracer(Net4j.DEBUG_CHANNEL,
ControlChannelImpl.class);
private SynchronizingCorrelator<Short, Boolean> registrations = new SynchronizingCorrelator();
public ControlChannelImpl(AbstractTCPConnector connector)
{
super(connector.getReceiveExecutor());
setChannelIndex(CONTROL_CHANNEL_ID);
setConnector(connector);
}
public boolean registerChannel(short channelIndex, String protocolID)
{
assertValidChannelIndex(channelIndex);
Synchronizer<Boolean> registration = registrations.correlate(channelIndex);
Buffer buffer = provideBuffer();
ByteBuffer byteBuffer = buffer.startPutting(CONTROL_CHANNEL_ID);
byteBuffer.put(OPCODE_REGISTRATION);
byteBuffer.putShort(channelIndex);
BufferUtil.putUTF8(byteBuffer, protocolID);
handleBuffer(buffer);
return registration.get(REGISTRATION_TIMEOUT);
}
public void deregisterChannel(short channelIndex)
{
assertValidChannelIndex(channelIndex);
Buffer buffer = provideBuffer();
ByteBuffer byteBuffer = buffer.startPutting(CONTROL_CHANNEL_ID);
byteBuffer.put(OPCODE_DEREGISTRATION);
byteBuffer.putShort(channelIndex);
handleBuffer(buffer);
}
private void assertValidChannelIndex(short channelIndex)
{
if (channelIndex <= CONTROL_CHANNEL_ID)
{
throw new IllegalArgumentException("channelIndex <= CONTROL_CHANNEL_ID"); //$NON-NLS-1$
}
}
public void handleBufferFromMultiplexer(Buffer buffer)
{
try
{
ByteBuffer byteBuffer = buffer.getByteBuffer();
byte opcode = byteBuffer.get();
switch (opcode)
{
case OPCODE_REGISTRATION:
{
short channelIndex = byteBuffer.getShort();
assertValidChannelIndex(channelIndex);
boolean success = true;
try
{
byte[] handlerFactoryUTF8 = BufferUtil.getByteArray(byteBuffer);
String protocolID = BufferUtil.fromUTF8(handlerFactoryUTF8);
ChannelImpl channel = ((AbstractTCPConnector)getConnector()).createChannel(channelIndex,
protocolID);
if (channel != null)
{
channel.activate();
}
else
{
success = false;
}
}
catch (Exception ex)
{
Net4j.LOG.error(ex);
success = false;
}
sendStatus(OPCODE_REGISTRATION_ACK, channelIndex, success);
break;
}
case OPCODE_REGISTRATION_ACK:
{
short channelIndex = byteBuffer.getShort();
boolean success = byteBuffer.get() == SUCCESS;
registrations.put(channelIndex, success);
break;
}
case OPCODE_DEREGISTRATION:
{
short channelIndex = byteBuffer.getShort();
assertValidChannelIndex(channelIndex);
try
{
ChannelImpl channel = ((AbstractTCPConnector)getConnector()).getChannel(channelIndex);
if (channel != null)
{
channel.deactivate();
}
else
{
if (TRACER.isEnabled())
{
TRACER.trace(this, "Invalid channel id: " + channelIndex); //$NON-NLS-1$
}
}
}
catch (Exception ex)
{
Net4j.LOG.error(ex);
}
break;
}
default:
Net4j.LOG.error("Invalid opcode: " + opcode); //$NON-NLS-1$
((AbstractTCPConnector)getConnector()).deactivate();
}
}
finally
{
buffer.release();
}
}
private void sendStatus(byte opcode, short channelIndex, boolean status)
{
Buffer buffer = provideBuffer();
ByteBuffer byteBuffer = buffer.startPutting(CONTROL_CHANNEL_ID);
byteBuffer.put(opcode);
byteBuffer.putShort(channelIndex);
byteBuffer.put(status ? SUCCESS : FAILURE);
handleBuffer(buffer);
}
}
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