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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.scheduler.strategy;

import org.apache.flink.runtime.executiongraph.ExecutionVertex;
import org.apache.flink.runtime.jobgraph.JobVertexID;
import org.apache.flink.runtime.topology.VertexID;

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

/**
 * Id identifying {@link ExecutionVertex}.
 */
public class ExecutionVertexID implements VertexID {
	private final JobVertexID jobVertexId;

	private final int subtaskIndex;

	public ExecutionVertexID(JobVertexID jobVertexId, int subtaskIndex) {
		checkArgument(subtaskIndex >= 0, "subtaskIndex must be greater than or equal to 0");

		this.jobVertexId = checkNotNull(jobVertexId);
		this.subtaskIndex = subtaskIndex;
	}

	public JobVertexID getJobVertexId() {
		return jobVertexId;
	}

	public int getSubtaskIndex() {
		return subtaskIndex;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}

		if (o == null || getClass() != o.getClass()) {
			return false;
		}

		ExecutionVertexID that = (ExecutionVertexID) o;

		return subtaskIndex == that.subtaskIndex && jobVertexId.equals(that.jobVertexId);
	}

	@Override
	public int hashCode() {
		int result = jobVertexId.hashCode();
		result = 31 * result + subtaskIndex;
		return result;
	}

	@Override
	public String toString() {
		return jobVertexId + "_" + subtaskIndex;
	}
}