org.apache.catalina.tribes.transport.ReplicationTransmitter Maven / Gradle / Ivy

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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.transport;

import java.io.IOException;

import javax.management.ObjectName;

import org.apache.catalina.tribes.Channel;
import org.apache.catalina.tribes.ChannelException;
import org.apache.catalina.tribes.ChannelMessage;
import org.apache.catalina.tribes.ChannelSender;
import org.apache.catalina.tribes.Member;
import org.apache.catalina.tribes.jmx.JmxRegistry;
import org.apache.catalina.tribes.transport.nio.PooledParallelSender;

/**
 * Transmit message to other cluster members Actual senders are created based on the replicationMode type
 */
public class ReplicationTransmitter implements ChannelSender {

    private Channel channel;

    /**
     * the ObjectName of this Sender.
     */
    private ObjectName oname = null;

    public ReplicationTransmitter() {
    }

    private MultiPointSender transport = new PooledParallelSender();

    public MultiPointSender getTransport() {
        return transport;
    }

    public void setTransport(MultiPointSender transport) {
        this.transport = transport;
    }

    // ------------------------------------------------------------- public

    @Override
    public void sendMessage(ChannelMessage message, Member[] destination) throws ChannelException {
        MultiPointSender sender = getTransport();
        sender.sendMessage(destination, message);
    }


    /**
     * start the sender and register transmitter mbean
     *
     * @see org.apache.catalina.tribes.ChannelSender#start()
     */
    @Override
    public synchronized void start() throws IOException {
        getTransport().connect();
        // register jmx
        JmxRegistry jmxRegistry = JmxRegistry.getRegistry(channel);
        if (jmxRegistry != null) {
            this.oname = jmxRegistry.registerJmx(",component=Sender", transport);
        }
    }

    /**
     * stop the sender and deregister mbeans (transmitter, senders)
     *
     * @see org.apache.catalina.tribes.ChannelSender#stop()
     */
    @Override
    public synchronized void stop() {
        getTransport().disconnect();
        if (oname != null) {
            JmxRegistry.getRegistry(channel).unregisterJmx(oname);
            oname = null;
        }
        channel = null;
    }

    /**
     * Call transmitter to check for sender socket status
     *
     * @see org.apache.catalina.ha.tcp.SimpleTcpCluster#backgroundProcess()
     */
    @Override
    public void heartbeat() {
        if (getTransport() != null) {
            getTransport().keepalive();
        }
    }

    /**
     * add new cluster member and create sender ( s. replicationMode) transfer current properties to sender
     *
     * @see org.apache.catalina.tribes.ChannelSender#add(org.apache.catalina.tribes.Member)
     */
    @Override
    public synchronized void add(Member member) {
        getTransport().add(member);
    }

    /**
     * remove sender from transmitter. ( deregister mbean and disconnect sender )
     *
     * @see org.apache.catalina.tribes.ChannelSender#remove(org.apache.catalina.tribes.Member)
     */
    @Override
    public synchronized void remove(Member member) {
        getTransport().remove(member);
    }

    @Override
    public Channel getChannel() {
        return channel;
    }

    @Override
    public void setChannel(Channel channel) {
        this.channel = channel;
    }

}