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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.ElasticsearchTimeoutException;
import org.elasticsearch.cluster.ClusterChangedEvent;
import org.elasticsearch.cluster.block.ClusterBlock;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.Randomness;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.component.AbstractLifecycleComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Setting;
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> {
public static final Setting<TimeValue> INITIAL_STATE_TIMEOUT_SETTING = Setting.positiveTimeSetting("discovery.initial_state_timeout", TimeValue.timeValueSeconds(30), false, Setting.Scope.CLUSTER);
public static final Setting<Long> DISCOVERY_SEED_SETTING = Setting.longSetting("discovery.id.seed", 0L, Long.MIN_VALUE, false, Setting.Scope.CLUSTER);
private static class InitialStateListener implements InitialStateDiscoveryListener {
private final CountDownLatch latch = new CountDownLatch(1);
private volatile boolean initialStateReceived;
@Override
public void initialStateProcessed() {
initialStateReceived = true;
latch.countDown();
}
public boolean waitForInitialState(TimeValue timeValue) throws InterruptedException {
if (timeValue.millis() > 0) {
latch.await(timeValue.millis(), TimeUnit.MILLISECONDS);
}
return initialStateReceived;
}
}
private final TimeValue initialStateTimeout;
private final Discovery discovery;
private InitialStateListener initialStateListener;
private final DiscoverySettings discoverySettings;
@Inject
public DiscoveryService(Settings settings, DiscoverySettings discoverySettings, Discovery discovery) {
super(settings);
this.discoverySettings = discoverySettings;
this.discovery = discovery;
this.initialStateTimeout = INITIAL_STATE_TIMEOUT_SETTING.get(settings);
}
public ClusterBlock getNoMasterBlock() {
return discoverySettings.getNoMasterBlock();
}
@Override
protected void doStart() {
initialStateListener = new InitialStateListener();
discovery.addListener(initialStateListener);
discovery.start();
logger.info(discovery.nodeDescription());
}
public void waitForInitialState() {
try {
if (!initialStateListener.waitForInitialState(initialStateTimeout)) {
logger.warn("waited for {} and no initial state was set by the discovery", initialStateTimeout);
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new ElasticsearchTimeoutException("Interrupted while waiting for initial discovery state");
}
}
@Override
protected void doStop() {
if (initialStateListener != null) {
discovery.removeListener(initialStateListener);
}
discovery.stop();
}
@Override
protected void doClose() {
discovery.close();
}
public DiscoveryNode localNode() {
return discovery.localNode();
}
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(ClusterChangedEvent clusterChangedEvent, Discovery.AckListener ackListener) {
if (lifecycle.started()) {
discovery.publish(clusterChangedEvent, ackListener);
}
}
public static String generateNodeId(Settings settings) {
Random random = Randomness.get(settings, DiscoveryService.DISCOVERY_SEED_SETTING);
return Strings.randomBase64UUID(random);
}
}
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