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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.catalina.tribes;
import java.io.IOException;
/**
* The <code>ChannelSender</code> interface is the data sender component at the bottom layer, the IO layer (for layers
* see the {@link Channel} interface). The channel sender must support "silent" members, i.e., be able to send a message
* to a member that is not in the membership, but is part of the destination parameter
*/
public interface ChannelSender extends Heartbeat {
/**
* Notify the sender of a member being added to the group.<br>
* Optional. This can be an empty implementation, that does nothing
*
* @param member Member
*/
void add(Member member);
/**
* Notification that a member has been removed or crashed. Can be used to clean up open connections etc
*
* @param member Member
*/
void remove(Member member);
/**
* Start the channel sender
*
* @throws IOException if preprocessing takes place and an error happens
*/
void start() throws IOException;
/**
* Stop the channel sender
*/
void stop();
/**
* A channel heartbeat, use this method to clean up resources
*/
@Override
void heartbeat();
/**
* Send a message to one or more recipients.
*
* @param message ChannelMessage - the message to be sent
* @param destination Member[] - the destinations
*
* @throws ChannelException - if an error happens, the ChannelSender MUST report individual send failures on a per
* member basis, using ChannelException.addFaultyMember
*
* @see ChannelException#addFaultyMember(Member,java.lang.Exception)
*/
void sendMessage(ChannelMessage message, Member[] destination) throws ChannelException;
/**
* Return the channel that is related to this ChannelSender
*
* @return Channel
*/
Channel getChannel();
/**
* Set the channel that is related to this ChannelSender
*
* @param channel The channel
*/
void setChannel(Channel channel);
}
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