ZenDiscoveryModule.java

/*
 * Licensed to ElasticSearch and Shay Banon 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.zen;

import com.google.common.collect.Lists;
import org.elasticsearch.common.inject.multibindings.Multibinder;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.discovery.AbstractDiscoveryModule;
import org.elasticsearch.discovery.Discovery;
import org.elasticsearch.discovery.zen.ping.ZenPingService;
import org.elasticsearch.discovery.unicast.UnicastHostsProvider;

import java.util.List;

/**
 */
public class ZenDiscoveryModule extends AbstractDiscoveryModule  {

    private final List<Class<? extends UnicastHostsProvider>> unicastHostProviders = Lists.newArrayList();
    
    /**
     * Adds a custom unicast hosts provider to build a dynamic list of unicast hosts list when doing unicast discovery.
     */
    @Override
    public ZenDiscoveryModule addUnicastHostProvider(Class<? extends UnicastHostsProvider> unicastHostProvider) {
        unicastHostProviders.add(unicastHostProvider);
        return this;
    }

    @Override
    protected void configure() {
        bind(ZenPingService.class).asEagerSingleton();
        Multibinder<UnicastHostsProvider> unicastHostsProviderMultibinder = Multibinder.newSetBinder(binder(), UnicastHostsProvider.class);
        for (Class<? extends UnicastHostsProvider> unicastHostProvider : unicastHostProviders) {
            unicastHostsProviderMultibinder.addBinding().to(unicastHostProvider);
        }
        bindDiscovery();
    }

    protected void bindDiscovery() {
        bind(Discovery.class).to(ZenDiscovery.class).asEagerSingleton();
    }
}