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Elasticsearch subproject :server
/*
* 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.cluster.node.DiscoveryNode;
import org.elasticsearch.common.inject.AbstractModule;
import org.elasticsearch.common.inject.multibindings.Multibinder;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.ExtensionPoint;
import org.elasticsearch.discovery.local.LocalDiscovery;
import org.elasticsearch.discovery.zen.ZenDiscovery;
import org.elasticsearch.discovery.zen.elect.ElectMasterService;
import org.elasticsearch.discovery.zen.ping.ZenPing;
import org.elasticsearch.discovery.zen.ping.ZenPingService;
import org.elasticsearch.discovery.zen.ping.unicast.UnicastHostsProvider;
import org.elasticsearch.discovery.zen.ping.unicast.UnicastZenPing;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* A module for loading classes for node discovery.
*/
public class DiscoveryModule extends AbstractModule {
public static final String DISCOVERY_TYPE_KEY = "discovery.type";
public static final String ZEN_MASTER_SERVICE_TYPE_KEY = "discovery.zen.masterservice.type";
private final Settings settings;
private final List> unicastHostProviders = new ArrayList<>();
private final ExtensionPoint.ClassSet zenPings = new ExtensionPoint.ClassSet<>("zen_ping", ZenPing.class);
private final Map> discoveryTypes = new HashMap<>();
private final Map> masterServiceType = new HashMap<>();
public DiscoveryModule(Settings settings) {
this.settings = settings;
addDiscoveryType("local", LocalDiscovery.class);
addDiscoveryType("zen", ZenDiscovery.class);
addElectMasterService("zen", ElectMasterService.class);
// always add the unicast hosts, or things get angry!
addZenPing(UnicastZenPing.class);
}
/**
* Adds a custom unicast hosts provider to build a dynamic list of unicast hosts list when doing unicast discovery.
*/
public void addUnicastHostProvider(Class unicastHostProvider) {
unicastHostProviders.add(unicastHostProvider);
}
/**
* Adds a custom Discovery type.
*/
public void addDiscoveryType(String type, Class clazz) {
if (discoveryTypes.containsKey(type)) {
throw new IllegalArgumentException("discovery type [" + type + "] is already registered");
}
discoveryTypes.put(type, clazz);
}
/**
* Adds a custom zen master service type.
*/
public void addElectMasterService(String type, Class masterService) {
if (masterServiceType.containsKey(type)) {
throw new IllegalArgumentException("master service type [" + type + "] is already registered");
}
this.masterServiceType.put(type, masterService);
}
public void addZenPing(Class clazz) {
zenPings.registerExtension(clazz);
}
@Override
protected void configure() {
String defaultType = DiscoveryNode.localNode(settings) ? "local" : "zen";
String discoveryType = settings.get(DISCOVERY_TYPE_KEY, defaultType);
Class discoveryClass = discoveryTypes.get(discoveryType);
if (discoveryClass == null) {
throw new IllegalArgumentException("Unknown Discovery type [" + discoveryType + "]");
}
if (discoveryType.equals("local") == false) {
String masterServiceTypeKey = settings.get(ZEN_MASTER_SERVICE_TYPE_KEY, "zen");
final Class masterService = masterServiceType.get(masterServiceTypeKey);
if (masterService == null) {
throw new IllegalArgumentException("Unknown master service type [" + masterServiceTypeKey + "]");
}
if (masterService == ElectMasterService.class) {
bind(ElectMasterService.class).asEagerSingleton();
} else {
bind(ElectMasterService.class).to(masterService).asEagerSingleton();
}
bind(ZenPingService.class).asEagerSingleton();
Multibinder unicastHostsProviderMultibinder = Multibinder.newSetBinder(binder(), UnicastHostsProvider.class);
for (Class unicastHostProvider : unicastHostProviders) {
unicastHostsProviderMultibinder.addBinding().to(unicastHostProvider);
}
zenPings.bind(binder());
}
bind(Discovery.class).to(discoveryClass).asEagerSingleton();
bind(DiscoveryService.class).asEagerSingleton();
}
}