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/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search 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.ClusterState;
import org.elasticsearch.util.component.LifecycleComponent;

/**
 * A pluggable module allowing to implement discovery of other nodes, publishing of the cluster
 * state to all nodes, electing a master of the cluster that raises cluster state change
 * events.
 *
 * @author kimchy (shay.banon)
 */
public interface Discovery extends LifecycleComponent {

    void addListener(InitialStateDiscoveryListener listener);

    void removeListener(InitialStateDiscoveryListener listener);

    String nodeDescription();

    /**
     * Is the discovery of this node caused this node to be the first master in the cluster.
     */
    boolean firstMaster();

    /**
     * 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...).
     */
    void publish(ClusterState clusterState);
}