/*
* JBoss, Home of Professional Open Source
*
* Copyright 2008 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.xnio.channels;
import java.nio.ByteBuffer;
import java.io.IOException;
import org.xnio.ChannelListener;
/**
* The readable side of a multipoint message channel.
*/
public interface ReadableMultipointMessageChannel extends SuspendableReadChannel {
/**
* Receive a message via this channel.
*
* If a message is immediately available, then the datagram is written into the given buffer and the source
* and destination addresses (if available) read into the address buffer. If there is no message immediately available,
* this method will return 0.
*
* @param addressBuffer the address buffer into which the source and destination addresses should be written ({@code null} to discard that information)
* @param buffer the buffer into which data should be read
* @return the size of the received message, 0 if no message is available, and -1 if the message channel has reached an end-of-file condition
* @throws IOException if an I/O error occurs
*/
int receiveFrom(SocketAddressBuffer addressBuffer, ByteBuffer buffer) throws IOException;
/**
* Receive a message.
*
* If a message is immediately available, then the datagram is written into the given buffers in a "scatter" fashion and the source
* and destination addresses (if available) read into the address buffer. If there is no message immediately available,
* this method will return 0.
*
* @param addressBuffer the address buffer into which the source and destination addresses should be written ({@code null} to discard that information)
* @param buffers the buffers that will hold the message
* @return the size of the received message, 0 if no message is available, and -1 if the message channel has reached an end-of-file condition
* @throws IOException if an I/O error occurs
*/
long receiveFrom(SocketAddressBuffer addressBuffer, ByteBuffer[] buffers) throws IOException;
/**
* Receive a message.
*
* If a message is immediately available, then the datagram is written into the given buffers in a "scatter" fashion and the source
* and destination addresses (if available) read into the address buffer. If there is no message immediately available,
* this method will return 0.
*
* @param addressBuffer the address buffer into which the source and destination addresses should be written ({@code null} to discard that information)
* @param buffers the buffers that will hold the message
* @param offs the offset into the array of buffers of the first buffer to read into
* @param len the number of buffers to fill
* @return the size of the received message, 0 if no message is available, and -1 if the message channel has reached an end-of-file condition
* @throws IOException if an I/O error occurs
*/
long receiveFrom(SocketAddressBuffer addressBuffer, ByteBuffer[] buffers, int offs, int len) throws IOException;
/** {@inheritDoc} */
ChannelListener.Setter<? extends ReadableMultipointMessageChannel> getReadSetter();
/** {@inheritDoc} */
ChannelListener.Setter<? extends ReadableMultipointMessageChannel> getCloseSetter();
}