/*
* Copyright 2014 the original author or authors.
*
* 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 net.kuujo.vertigo.cluster.manager.impl;
import java.lang.reflect.Field;
import org.vertx.java.core.Vertx;
import org.vertx.java.core.impl.VertxInternal;
import org.vertx.java.core.spi.cluster.ClusterManager;
import com.hazelcast.core.HazelcastInstance;
/**
* Cluster membership listener factory.
*
* @author <a href="http://github.com/kuujo">Jordan Halterman</a>
*/
class ClusterListenerFactory {
private final Vertx vertx;
ClusterListenerFactory(Vertx vertx) {
this.vertx = vertx;
}
/**
* Returns the Vert.x Hazelcast instance if one exists.
*
* @param vertx The current Vert.x instance.
* @return The Vert.x Hazelcast instance if Vert.x is clustered.
*/
static HazelcastInstance getHazelcastInstance(Vertx vertx) {
VertxInternal vertxInternal = (VertxInternal) vertx;
ClusterManager clusterManager = vertxInternal.clusterManager();
if (clusterManager != null) {
Class<?> clazz = clusterManager.getClass();
Field field;
try {
field = clazz.getDeclaredField("hazelcast");
field.setAccessible(true);
return HazelcastInstance.class.cast(field.get(clusterManager));
} catch (Exception e) {
return null;
}
}
return null;
}
/**
* Creates a cluster listener.
*
* @param localOnly Indicates whether to force the cluster to be local only.
* @return A new cluster listener.
*/
public ClusterListener createClusterListener(boolean localOnly) {
if (localOnly) return new NoClusterListener();
HazelcastInstance hazelcast = getHazelcastInstance(vertx);
if (hazelcast != null) {
return new HazelcastClusterListener(hazelcast, vertx);
} else {
return new NoClusterListener();
}
}
}