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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.ElasticsearchException;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.component.AbstractLifecycleComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import java.util.Random;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
*
*/
public class DiscoveryService extends AbstractLifecycleComponent<DiscoveryService> {
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();
if (initialStateTimeout.millis() > 0) {
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();
}
public DiscoveryNode localNode() {
return discovery.localNode();
}
/**
* Returns <tt>true</tt> 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();
}
/**
* 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...).
* <p/>
* The {@link org.elasticsearch.discovery.Discovery.AckListener} allows to acknowledge the publish
* event based on the response gotten from all nodes
*/
public void publish(ClusterState clusterState, Discovery.AckListener ackListener) {
if (lifecycle.started()) {
discovery.publish(clusterState, ackListener);
}
}
public static String generateNodeId(Settings settings) {
String seed = settings.get("discovery.id.seed");
if (seed != null) {
Strings.randomBase64UUID(new Random(Long.parseLong(seed)));
}
return Strings.randomBase64UUID();
}
}
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