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/***************************************************************************
* Copyright (c) 2004 - 2008 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.net4j.internal.tcp;
import org.eclipse.net4j.IBuffer;
import org.eclipse.net4j.IProtocol;
import org.eclipse.net4j.internal.tcp.bundle.OM;
import org.eclipse.net4j.internal.util.concurrent.SynchronizingCorrelator;
import org.eclipse.net4j.internal.util.om.trace.ContextTracer;
import org.eclipse.net4j.util.concurrent.ConcurrencyUtil;
import org.eclipse.net4j.util.concurrent.ISynchronizer;
import org.eclipse.net4j.util.concurrent.TimeoutRuntimeException;
import org.eclipse.net4j.util.security.INegotiationContext;
import org.eclipse.net4j.util.security.INegotiationContext.Receiver;
import org.eclipse.internal.net4j.BufferUtil;
import org.eclipse.internal.net4j.Channel;
import java.nio.ByteBuffer;
/**
* @author Eike Stepper
*/
public final class ControlChannel extends Channel
{
public static final long REGISTRATION_TIMEOUT = OM.PROTOCOL_REGISTRATION_TIMEOUT;
public static final short CONTROL_CHANNEL_INDEX = -1;
public static final byte OPCODE_NEGOTIATION = 1;
public static final byte OPCODE_REGISTRATION = 2;
public static final byte OPCODE_REGISTRATION_ACK = 3;
public static final byte OPCODE_DEREGISTRATION = 4;
public static final byte SUCCESS = 1;
public static final byte FAILURE = 0;
private static final ContextTracer TRACER = new ContextTracer(OM.DEBUG, ControlChannel.class);
private SynchronizingCorrelator<Short, Boolean> registrations = new SynchronizingCorrelator<Short, Boolean>();
private TCPConnector connector;
public ControlChannel(int channelID, TCPConnector connector)
{
super(channelID, connector.getBufferProvider(), connector, connector.getReceiveExecutor());
this.connector = connector;
setChannelIndex(CONTROL_CHANNEL_INDEX);
}
@Override
public boolean isInternal()
{
return true;
}
public TCPConnector getConnector()
{
return connector;
}
public boolean registerChannel(int channelID, short channelIndex, IProtocol protocol)
{
if (TRACER.isEnabled())
{
TRACER.format("Registering channel {0} with protocol {1}", channelIndex, protocol);
}
assertValidChannelIndex(channelIndex);
ISynchronizer<Boolean> registration = registrations.correlate(channelIndex);
IBuffer buffer = provideBuffer();
ByteBuffer byteBuffer = buffer.startPutting(CONTROL_CHANNEL_INDEX);
byteBuffer.put(OPCODE_REGISTRATION);
byteBuffer.putInt(channelID);
byteBuffer.putShort(channelIndex);
BufferUtil.putUTF8(byteBuffer, protocol == null ? null : protocol.getType());
handleBuffer(buffer);
Boolean acknowledged = registration.get(REGISTRATION_TIMEOUT);
if (acknowledged == null)
{
throw new TimeoutRuntimeException("Registration timeout after " + REGISTRATION_TIMEOUT + " milliseconds");
}
return acknowledged;
}
public void deregisterChannel(int channelID, short channelIndex)
{
if (TRACER.isEnabled())
{
TRACER.format("Deregistering channel {0}", channelIndex);
}
assertValidChannelIndex(channelIndex);
IBuffer buffer = provideBuffer();
ByteBuffer byteBuffer = buffer.startPutting(CONTROL_CHANNEL_INDEX);
byteBuffer.put(OPCODE_DEREGISTRATION);
byteBuffer.putInt(channelID);
byteBuffer.putShort(channelIndex);
handleBuffer(buffer);
}
@Override
public void handleBufferFromMultiplexer(IBuffer buffer)
{
try
{
ByteBuffer byteBuffer = buffer.getByteBuffer();
byte opcode = byteBuffer.get();
switch (opcode)
{
case OPCODE_NEGOTIATION:
{
assertNegotiating();
INegotiationContext negotiationContext = connector.getNegotiationContext();
while (negotiationContext == null)
{
ConcurrencyUtil.sleep(20);
negotiationContext = connector.getNegotiationContext();
}
Receiver receiver = negotiationContext.getReceiver();
receiver.receiveBuffer(negotiationContext, byteBuffer);
break;
}
case OPCODE_REGISTRATION:
{
assertConnected();
int channelID = byteBuffer.getInt();
short channelIndex = byteBuffer.getShort();
assertValidChannelIndex(channelIndex);
boolean success = true;
try
{
byte[] handlerFactoryUTF8 = BufferUtil.getByteArray(byteBuffer);
String protocolID = BufferUtil.fromUTF8(handlerFactoryUTF8);
Channel channel = connector.createChannel(channelID, channelIndex, protocolID);
if (channel != null)
{
channel.activate();
}
else
{
success = false;
}
}
catch (Exception ex)
{
OM.LOG.error(ex);
success = false;
}
sendStatus(OPCODE_REGISTRATION_ACK, channelIndex, success);
break;
}
case OPCODE_REGISTRATION_ACK:
{
assertConnected();
short channelIndex = byteBuffer.getShort();
boolean success = byteBuffer.get() == SUCCESS;
registrations.put(channelIndex, success);
break;
}
case OPCODE_DEREGISTRATION:
{
assertConnected();
int channelID = byteBuffer.getInt();
short channelIndex = byteBuffer.getShort();
if (channelIndex != CONTROL_CHANNEL_INDEX)
{
try
{
connector.inverseRemoveChannel(channelID, channelIndex);
}
catch (Exception ex)
{
OM.LOG.error(ex);
}
}
break;
}
default:
OM.LOG.error("Invalid opcode: " + opcode); //$NON-NLS-1$
connector.deactivate();
}
}
finally
{
buffer.release();
}
}
@Override
public String toString()
{
return "Channel[Control]";
}
private void sendStatus(byte opcode, short channelIndex, boolean status)
{
IBuffer buffer = provideBuffer();
ByteBuffer byteBuffer = buffer.startPutting(CONTROL_CHANNEL_INDEX);
byteBuffer.put(opcode);
byteBuffer.putShort(channelIndex);
byteBuffer.put(status ? SUCCESS : FAILURE);
handleBuffer(buffer);
}
private void assertNegotiating()
{
if (!connector.isNegotiating())
{
connector.deactivate();
throw new IllegalStateException("Connector is not negotiating");
}
}
private void assertConnected()
{
if (!connector.isConnected())
{
throw new IllegalStateException("Connector is not connected");
}
}
private void assertValidChannelIndex(short channelIndex)
{
if (channelIndex <= CONTROL_CHANNEL_INDEX)
{
throw new IllegalArgumentException("channelIndex <= CONTROL_CHANNEL_ID"); //$NON-NLS-1$
}
}
}
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