org.elasticsearch.discovery.DiscoveryService Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Open Source, Distributed, RESTful Search Engine
/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.elasticsearch.discovery;
import org.elasticsearch.util.inject.Inject;
import org.elasticsearch.ElasticSearchException;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.util.TimeValue;
import org.elasticsearch.util.component.AbstractLifecycleComponent;
import org.elasticsearch.util.settings.Settings;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* @author kimchy (shay.banon)
*/
public class DiscoveryService extends AbstractLifecycleComponent {
private final TimeValue initialStateTimeout;
private final Discovery discovery;
private volatile boolean initialStateReceived;
@Inject public DiscoveryService(Settings settings, Discovery discovery) {
super(settings);
this.discovery = discovery;
this.initialStateTimeout = componentSettings.getAsTime("initial_state_timeout", TimeValue.timeValueSeconds(30));
}
@Override protected void doStart() throws ElasticSearchException {
final CountDownLatch latch = new CountDownLatch(1);
InitialStateDiscoveryListener listener = new InitialStateDiscoveryListener() {
@Override public void initialStateProcessed() {
latch.countDown();
}
};
discovery.addListener(listener);
try {
discovery.start();
try {
logger.trace("Waiting for {} for the initial state to be set by the discovery", initialStateTimeout);
if (latch.await(initialStateTimeout.millis(), TimeUnit.MILLISECONDS)) {
logger.trace("Initial state set from discovery");
initialStateReceived = true;
} else {
initialStateReceived = false;
logger.warn("Waited for {} and no initial state was set by the discovery", initialStateTimeout);
}
} catch (InterruptedException e) {
// ignore
}
} finally {
discovery.removeListener(listener);
}
logger.info(discovery.nodeDescription());
}
@Override protected void doStop() throws ElasticSearchException {
discovery.stop();
}
@Override protected void doClose() throws ElasticSearchException {
discovery.close();
}
/**
* Returns true if the initial state was received within the timeout waiting for it
* on {@link #doStart()}.
*/
public boolean initialStateReceived() {
return initialStateReceived;
}
public String nodeDescription() {
return discovery.nodeDescription();
}
public boolean firstMaster() {
return discovery.firstMaster();
}
/**
* Publish all the changes to the cluster from the master (can be called just by the master). The publish
* process should not publish this state to the master as well! (the master is sending it...).
*/
public void publish(ClusterState clusterState) {
if (!lifecycle.started()) {
return;
}
discovery.publish(clusterState);
}
}