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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.cluster.routing.allocation.AllocationService;
import org.elasticsearch.cluster.service.ClusterApplier;
import org.elasticsearch.cluster.service.MasterService;
import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.network.NetworkService;
import org.elasticsearch.common.settings.ClusterSettings;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Setting.Property;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.discovery.single.SingleNodeDiscovery;
import org.elasticsearch.discovery.zen.UnicastHostsProvider;
import org.elasticsearch.discovery.zen.ZenDiscovery;
import org.elasticsearch.plugins.DiscoveryPlugin;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Function;
import java.util.function.Supplier;
/**
* A module for loading classes for node discovery.
*/
public class DiscoveryModule {
public static final Setting<String> DISCOVERY_TYPE_SETTING =
new Setting<>("discovery.type", "zen", Function.identity(), Property.NodeScope);
public static final Setting<Optional<String>> DISCOVERY_HOSTS_PROVIDER_SETTING =
new Setting<>("discovery.zen.hosts_provider", (String)null, Optional::ofNullable, Property.NodeScope);
private final Discovery discovery;
public DiscoveryModule(Settings settings, ThreadPool threadPool, TransportService transportService,
NamedWriteableRegistry namedWriteableRegistry, NetworkService networkService, MasterService masterService,
ClusterApplier clusterApplier, ClusterSettings clusterSettings, List<DiscoveryPlugin> plugins,
AllocationService allocationService) {
final UnicastHostsProvider hostsProvider;
Map<String, Supplier<UnicastHostsProvider>> hostProviders = new HashMap<>();
for (DiscoveryPlugin plugin : plugins) {
plugin.getZenHostsProviders(transportService, networkService).entrySet().forEach(entry -> {
if (hostProviders.put(entry.getKey(), entry.getValue()) != null) {
throw new IllegalArgumentException("Cannot register zen hosts provider [" + entry.getKey() + "] twice");
}
});
}
Optional<String> hostsProviderName = DISCOVERY_HOSTS_PROVIDER_SETTING.get(settings);
if (hostsProviderName.isPresent()) {
Supplier<UnicastHostsProvider> hostsProviderSupplier = hostProviders.get(hostsProviderName.get());
if (hostsProviderSupplier == null) {
throw new IllegalArgumentException("Unknown zen hosts provider [" + hostsProviderName.get() + "]");
}
hostsProvider = Objects.requireNonNull(hostsProviderSupplier.get());
} else {
hostsProvider = Collections::emptyList;
}
Map<String, Supplier<Discovery>> discoveryTypes = new HashMap<>();
discoveryTypes.put("zen",
() -> new ZenDiscovery(settings, threadPool, transportService, namedWriteableRegistry, masterService, clusterApplier,
clusterSettings, hostsProvider, allocationService));
discoveryTypes.put("tribe", () -> new TribeDiscovery(settings, transportService, masterService, clusterApplier));
discoveryTypes.put("single-node", () -> new SingleNodeDiscovery(settings, transportService, masterService, clusterApplier));
for (DiscoveryPlugin plugin : plugins) {
plugin.getDiscoveryTypes(threadPool, transportService, namedWriteableRegistry,
masterService, clusterApplier, clusterSettings, hostsProvider, allocationService).entrySet().forEach(entry -> {
if (discoveryTypes.put(entry.getKey(), entry.getValue()) != null) {
throw new IllegalArgumentException("Cannot register discovery type [" + entry.getKey() + "] twice");
}
});
}
String discoveryType = DISCOVERY_TYPE_SETTING.get(settings);
Supplier<Discovery> discoverySupplier = discoveryTypes.get(discoveryType);
if (discoverySupplier == null) {
throw new IllegalArgumentException("Unknown discovery type [" + discoveryType + "]");
}
Loggers.getLogger(getClass(), settings).info("using discovery type [{}]", discoveryType);
discovery = Objects.requireNonNull(discoverySupplier.get());
}
public Discovery getDiscovery() {
return discovery;
}
}