StopClusterSuccessful.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.flink.runtime.clusterframework.messages;

import org.apache.flink.runtime.messages.RequiresLeaderSessionID;

/**
 * Generic message to signal the cluster listener that the cluster has been shut down.
 */
public class StopClusterSuccessful implements RequiresLeaderSessionID, java.io.Serializable {

	private static final long serialVersionUID = 42L;

	private static StopClusterSuccessful INSTANCE = new StopClusterSuccessful();

	/**
	 * Private constructor. Initial singleton in get() method.
	 */
	private StopClusterSuccessful() {}

	public static StopClusterSuccessful getInstance() {
		return INSTANCE;
	}

	@Override
	public String toString() {
		return "StopClusterSuccessful{}";
	}
}