/**
* 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.jgroups;
import java.util.ArrayList;
import java.util.List;
import org.jboss.logging.Logger;
import org.jgroups.JChannel;
import org.jgroups.Message;
import org.jgroups.ReceiverAdapter;
/**
* This class wraps a JChannel with a reference counter. The reference counter
* controls the life of the JChannel. When reference count is zero, the channel
* will be disconnected.
*/
public class JChannelWrapper {
private static final Logger logger = Logger.getLogger(JChannelWrapper.class);
private boolean connected = false;
int refCount = 1;
final JChannel channel;
final String channelName;
final List<JGroupsReceiver> receivers = new ArrayList<>();
private final JChannelManager manager;
public JChannelWrapper(JChannelManager manager, final String channelName, JChannel channel) throws Exception {
this.refCount = 1;
this.channelName = channelName;
this.channel = channel;
this.manager = manager;
if (logger.isTraceEnabled() && channel.getReceiver() != null) {
logger.trace(this + "The channel already had a receiver previously!!!! == " + channel.getReceiver(), new Exception("trace"));
}
//we always add this for the first ref count
channel.setReceiver(new ReceiverAdapter() {
@Override
public String toString() {
return "ReceiverAdapter::" + JChannelWrapper.this;
}
@Override
public void receive(org.jgroups.Message msg) {
if (logger.isTraceEnabled()) {
logger.trace(this + ":: Wrapper received " + msg + " on channel " + channelName);
}
synchronized (receivers) {
for (JGroupsReceiver r : receivers) {
r.receive(msg);
}
}
}
});
}
public JChannel getChannel() {
return channel;
}
public String getChannelName() {
return channelName;
}
public synchronized void close(boolean closeWrappedChannel) {
refCount--;
if (logger.isTraceEnabled())
logger.trace(this + "::RefCount-- " + refCount + " on channel " + channelName, new Exception("Trace"));
if (refCount == 0) {
if (closeWrappedChannel) {
closeChannel();
}
manager.removeChannel(channelName);
}
}
public synchronized void closeChannel() {
connected = false;
channel.setReceiver(null);
if (logger.isTraceEnabled()) {
logger.trace(this + "::Closing Channel: " + channelName, new Exception("Trace"));
}
channel.close();
}
public void removeReceiver(JGroupsReceiver receiver) {
if (logger.isTraceEnabled())
logger.trace(this + "::removeReceiver: " + receiver + " on " + channelName, new Exception("Trace"));
synchronized (receivers) {
receivers.remove(receiver);
}
}
public synchronized void connect() throws Exception {
if (logger.isTraceEnabled()) {
logger.trace(this + ":: Connecting " + channelName, new Exception("Trace"));
}
// It is important to check this otherwise we could reconnect an already connected channel
if (connected) {
return;
}
connected = true;
if (!channel.isConnected()) {
channel.connect(channelName);
}
}
public void addReceiver(JGroupsReceiver jGroupsReceiver) {
synchronized (receivers) {
if (logger.isTraceEnabled())
logger.trace(this + "::Add Receiver: " + jGroupsReceiver + " on " + channelName);
receivers.add(jGroupsReceiver);
}
}
public void send(org.jgroups.Message msg) throws Exception {
if (logger.isTraceEnabled())
logger.trace(this + "::Sending JGroups Message: Open=" + channel.isOpen() + " on channel " + channelName + " msg=" + msg);
if (!manager.isLoopbackMessages()) {
msg.setTransientFlag(Message.TransientFlag.DONT_LOOPBACK);
}
channel.send(msg);
}
public JChannelWrapper addRef() {
this.refCount++;
if (logger.isTraceEnabled())
logger.trace(this + "::RefCount++ = " + refCount + " on channel " + channelName);
return this;
}
@Override
public String toString() {
return super.toString() +
"{refCount=" + refCount +
", channel=" + channel +
", channelName='" + channelName + '\'' +
", connected=" + connected +
'}';
}
}