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/**
* Copyright (c) 2004 - 2011 Eike Stepper (Berlin, Germany) 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.channel;
import org.eclipse.net4j.ILocationAware;
import org.eclipse.net4j.buffer.IBuffer;
import org.eclipse.net4j.buffer.IBufferHandler;
import org.eclipse.net4j.connector.IConnector;
import org.eclipse.net4j.util.collection.Closeable;
import org.eclipse.net4j.util.event.INotifier;
import org.eclipse.net4j.util.security.IUserAware;
/**
* A bidirectional communications channel for the asynchronous exchange of {@link IBuffer buffers}. A channel is
* lightweight and virtual in the sense that it does not necessarily represent a single physical connection like a TCP
* socket connection. The underlying physical connection is represented by a {@link IChannelMultiplexer channel
* multiplexer}.
* <p>
* <dt><b>Class Diagram:</b></dt>
* <dd><img src="doc-files/IChannel-1.gif" title="Diagram Buffers" border="0" usemap="#IChannel-1.gif"/></dd>
* <p>
* <MAP NAME="IChannel-1.gif"> <AREA SHAPE="RECT" COORDS="301,8,451,68" HREF="IChannelID.html"> <AREA SHAPE="RECT"
* COORDS="301,141,451,211" HREF="IChannel.html"> <AREA SHAPE="RECT" COORDS="599,151,696,201"
* HREF="../buffer/IBufferHandler.html"> <AREA SHAPE="RECT" COORDS="7,151,96,201" HREF="../connector/IConnector.html">
* </MAP>
* <p>
* An example for opening a channel on an {@link IConnector} and sending an {@link IBuffer}:
* <p>
*
* <pre style="background-color:#ffffc8; border-width:1px; border-style:solid; padding:.5em;">
* // Open a channel
* IChannel channel = connector.openChannel();
* short channelID = channel.getIndex();
*
* // Fill a buffer
* Buffer buffer = bufferProvider.getBuffer();
* ByteBuffer byteBuffer = buffer.startPutting(channelID);
* byteBuffer.putDouble(15.47);
*
* // Let the channel send the buffer without blocking
* channel.sendBuffer(buffer);
* </pre>
* <p>
* An example for receiving {@link IBuffer}s from channels on an {@link IConnector}:
* <p>
*
* <pre style="background-color:#ffffc8; border-width:1px; border-style:solid; padding:.5em;">
* // Create a receive handler
* final IBufferHandler receiveHandler = new IBufferHandler()
* {
* public void handleBuffer(IBuffer buffer)
* {
* ByteBuffer byteBuffer = buffer.getByteBuffer();
* IOUtil.OUT().println("Received " + byteBuffer.getDouble());
* buffer.release();
* }
* };
*
* // Set the receive handler to all new channels
* connector.addListener(new ContainerEventAdapter()
* {
* protected void onAdded(IContainer container, Object element)
* {
* IChannel channel = (IChannel)element;
* channel.setReceiveHandler(receiveHandler);
* }
* });
* </pre>
*
* @author Eike Stepper
* @noimplement This interface is <b>not</b> intended to be implemented by clients. Providers of channels (for example
* for new physical connection types) have to extend/subclass {@link org.eclipse.spi.net4j.InternalChannel
* InternalChannel}.
*/
public interface IChannel extends ILocationAware, IUserAware, IBufferHandler, INotifier, Closeable
{
/**
* Returns the ID of this channel. The ID is unique at any time among all channels of the associated
* {@link IChannelMultiplexer multiplexer}.
*
* @since 2.0
*/
public short getID();
/**
* Returns the multiplexer this channel is associated with. This channel multiplexer can be used, for example, to open
* additional channels that will be multiplexed through the same transport medium.
*
* @since 2.0
*/
public IChannelMultiplexer getMultiplexer();
/**
* Asynchronously sends the given buffer to the receive handler of the peer channel.
*/
public void sendBuffer(IBuffer buffer);
/**
* Returns the <code>IBufferHandler</code> that handles buffers received from the peer channel.
*/
public IBufferHandler getReceiveHandler();
/**
* Sets the <code>IBufferHandler</code> to handle buffers received from the peer channel.
*/
public void setReceiveHandler(IBufferHandler receiveHandler);
}
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