/*
 * 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 akka.actor.ActorRef;
import org.apache.flink.runtime.clusterframework.types.ResourceID;
import org.apache.flink.runtime.messages.RequiresLeaderSessionID;

import java.io.Serializable;
import java.util.Collection;

import static java.util.Objects.requireNonNull;

/**
 * Message that informs the resource manager that the JobManager accepted its registration.
 * Carries information about the JobManager, and about the TaskManagers that the JobManager
 * still has registered.
 */
public class RegisterResourceManagerSuccessful implements RequiresLeaderSessionID, Serializable {

	private static final long serialVersionUID = 817011779310941753L;

	/** The JobManager which we registered with. */
	private final ActorRef jobManager;

	/** The list of registered TaskManagers that the JobManager currently knows */
	private final Collection<ResourceID> currentlyRegisteredTaskManagers;

	/**
	 * Creates a new message with a list of existing known TaskManagers.
	 * 
	 * @param currentlyRegisteredTaskManagers
	 *         The list of TaskManagers that the JobManager currently knows. 
	 */
	public RegisterResourceManagerSuccessful(ActorRef jobManager,
			Collection<ResourceID> currentlyRegisteredTaskManagers)
	{
		this.jobManager = jobManager;
		this.currentlyRegisteredTaskManagers = requireNonNull(currentlyRegisteredTaskManagers);
	}

	// ------------------------------------------------------------------------


	public ActorRef jobManager() {
		return jobManager;
	}

	public Collection<ResourceID> currentlyRegisteredTaskManagers() {
		return currentlyRegisteredTaskManagers;
	}

	// ------------------------------------------------------------------------

	@Override
	public String toString() {
		return "RegisterResourceManagerSuccessful{" +
			"jobManager=" + jobManager +
			", currentlyRegisteredTaskManagers=" + currentlyRegisteredTaskManagers +
			'}';
	}
}