org.teiid.jboss.NodeTracker Maven / Gradle / Ivy
/*
* Copyright Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags and
* the COPYRIGHT.txt file distributed with this work.
*
* 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.teiid.jboss;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.jgroups.Address;
import org.jgroups.JChannel;
import org.jgroups.Message;
import org.jgroups.ReceiverAdapter;
import org.jgroups.View;
import org.teiid.logging.LogConstants;
import org.teiid.logging.LogManager;
import org.teiid.runtime.NodeListener;
import org.teiid.runtime.RuntimePlugin;
import org.teiid.runtime.RuntimePlugin.Event;
public abstract class NodeTracker extends ReceiverAdapter{
public abstract ScheduledExecutorService getScheduledExecutorService();
private Map nodes = new HashMap<>();
private JChannel channel;
private String nodeName;
private Set nodeListeners = Collections.synchronizedSet(new HashSet());
public NodeTracker(JChannel channel, String nodeName) throws Exception {
this.nodeName = nodeName;
this.channel = channel;
this.channel.setReceiver(this);
this.channel.connect("teiid-node-tracker");
}
public void addNodeListener(NodeListener nodeListener) {
this.nodeListeners.add(nodeListener);
}
public void removeNodeListener(NodeListener nodeListener) {
this.nodeListeners.remove(nodeListener);
}
public boolean isNodeAlive(String nodeName) {
if (this.nodeName.equalsIgnoreCase(nodeName)) {
return true;
}
return nodes.values().contains(nodeName);
}
@Override
public void viewAccepted(View view) {
Map newMembers = new HashMap<>();
Map deadMembers = null;
if (view.getMembers() != null && !this.nodes.isEmpty()) {
synchronized (nodes) {
for (Address addr : view.getMembers()) {
String name = this.nodes.remove(addr);
if (name != null) {
// existing node
newMembers.put(addr, name);
}
}
deadMembers = this.nodes;
this.nodes = newMembers;
}
if (!deadMembers.isEmpty()) {
for (String name : deadMembers.values()) {
// node removed
if (!this.nodeListeners.isEmpty()) {
for (NodeListener nl : this.nodeListeners) {
nl.nodeDropped(name);
}
}
}
}
}
getScheduledExecutorService().schedule(
new Runnable() {
public void run() {
Message msg=new Message(null, nodeName);
try {
channel.send(msg);
} catch (Exception e) {
LogManager.logError(LogConstants.CTX_RUNTIME, e, RuntimePlugin.Util.gs(RuntimePlugin.Event.TEIID40165));
}
}
}, 2000, TimeUnit.MILLISECONDS);
}
@Override
public void receive(Message msg) {
synchronized (this.nodes) {
String prevNode = this.nodes.put(msg.getSrc(), (String)msg.getObject());
// node added
if (prevNode == null) {
for (NodeListener nl : this.nodeListeners) {
nl.nodeJoined((String)msg.getObject());
}
}
}
}
}