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JGroupsBroadcastEndpoint.java
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JGroupsBroadcastEndpoint.java
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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.activemq.artemis.api.core;
import java.util.concurrent.TimeUnit;
import org.apache.activemq.artemis.api.core.jgroups.JChannelManager;
import org.apache.activemq.artemis.api.core.jgroups.JChannelWrapper;
import org.apache.activemq.artemis.api.core.jgroups.JGroupsReceiver;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.invoke.MethodHandles;
import org.jgroups.JChannel;
/**
* This class is the implementation of ActiveMQ Artemis members discovery that will use JGroups.
*/
public abstract class JGroupsBroadcastEndpoint implements BroadcastEndpoint {
private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
private final String channelName;
private boolean clientOpened;
private boolean broadcastOpened;
private JChannelWrapper channel;
private JGroupsReceiver receiver;
private JChannelManager manager;
public JGroupsBroadcastEndpoint(JChannelManager manager, String channelName) {
this.manager = manager;
this.channelName = channelName;
}
@Override
public void broadcast(final byte[] data) throws Exception {
if (logger.isTraceEnabled()) {
logger.trace("Broadcasting: BroadCastOpened={}, channelOPen={}", broadcastOpened, channel.getChannel().isOpen());
}
if (broadcastOpened) {
org.jgroups.Message msg = new org.jgroups.BytesMessage();
msg.setArray(data);
channel.send(msg);
}
}
@Override
public byte[] receiveBroadcast() throws Exception {
if (logger.isTraceEnabled()) {
logger.trace("Receiving Broadcast: clientOpened={}, channelOPen={}", clientOpened, channel.getChannel().isOpen());
}
if (clientOpened) {
return receiver.receiveBroadcast();
} else {
return null;
}
}
@Override
public byte[] receiveBroadcast(long time, TimeUnit unit) throws Exception {
if (logger.isTraceEnabled()) {
logger.trace("Receiving Broadcast2: clientOpened={}, channelOPen={}", clientOpened, channel.getChannel().isOpen());
}
if (clientOpened) {
return receiver.receiveBroadcast(time, unit);
} else {
return null;
}
}
@Override
public synchronized void openClient() throws Exception {
if (clientOpened) {
return;
}
internalOpen();
receiver = new JGroupsReceiver();
channel.addReceiver(receiver);
clientOpened = true;
}
@Override
public synchronized void openBroadcaster() throws Exception {
if (broadcastOpened)
return;
internalOpen();
broadcastOpened = true;
}
public abstract JChannel createChannel() throws Exception;
public JGroupsBroadcastEndpoint initChannel() throws Exception {
this.channel = manager.getJChannel(channelName, this);
return this;
}
protected void internalOpen() throws Exception {
channel.connect();
}
@Override
public synchronized void close(boolean isBroadcast) throws Exception {
if (isBroadcast) {
broadcastOpened = false;
} else {
channel.removeReceiver(receiver);
clientOpened = false;
}
internalCloseChannel(channel);
}
/**
* Closes the channel used in this JGroups Broadcast.
* Can be overridden by implementations that use an externally managed channel.
*
* @param channel
*/
protected synchronized void internalCloseChannel(JChannelWrapper channel) {
channel.close(true);
}
}