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/*
 * 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.checkpoint.savepoint;

import org.apache.flink.runtime.checkpoint.MasterState;
import org.apache.flink.runtime.checkpoint.OperatorState;
import org.apache.flink.runtime.checkpoint.TaskState;

import java.util.Collection;

import static org.apache.flink.util.Preconditions.checkNotNull;

/**
 * The persistent checkpoint metadata, format version 3.
 */
public class SavepointV3 implements Savepoint {

	/** The savepoint version. */
	public static final int VERSION = 3;

	/** The checkpoint ID */
	private final long checkpointId;

	/** The operator states */
	private final Collection operatorStates;

	/** The states generated by the CheckpointCoordinator */
	private final Collection masterStates;

	public SavepointV3(long checkpointId, Collection operatorStates, Collection masterStates) {
		this.checkpointId = checkpointId;
		this.operatorStates = operatorStates;
		this.masterStates = checkNotNull(masterStates, "masterStates");
	}

	@Override
	public long getCheckpointId() {
		return checkpointId;
	}

	@Override
	public Collection getTaskStates() {
		throw new UnsupportedOperationException("TaskStates is no longer supported.");
	}

	@Override
	public Collection getMasterStates() {
		return masterStates;
	}

	@Override
	public Collection getOperatorStates() {
		return operatorStates;
	}

	@Override
	public int getVersion() {
		return VERSION;
	}

	@Override
	public void dispose() throws Exception {
		for (OperatorState operatorState : operatorStates) {
			operatorState.discardState();
		}
		operatorStates.clear();
		masterStates.clear();
	}

	@Override
	public String toString() {
		return "Checkpoint Metadata (version=" + VERSION + ')';
	}
}