/*
 * 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.agents.runtime.feedback;

import java.io.Serializable;
import java.util.Objects;

/**
 * NOTE: This source code was copied from the <a
 * href="https://github.com/apache/flink-statefun">flink-statefun</a>
 *
 * <p>A FeedbackKey bounded to a subtask index.
 */
@SuppressWarnings("unused")
public final class SubtaskFeedbackKey<V> implements Serializable {

    private static final long serialVersionUID = 1;

    private final String pipelineName;
    private final int subtaskIndex;
    private final long invocationId;
    private final int attemptId;

    SubtaskFeedbackKey(String pipeline, long invocationId, int subtaskIndex, int attemptId) {
        this.pipelineName = Objects.requireNonNull(pipeline);
        this.invocationId = invocationId;
        this.subtaskIndex = subtaskIndex;
        this.attemptId = attemptId;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        SubtaskFeedbackKey<?> that = (SubtaskFeedbackKey<?>) o;
        return subtaskIndex == that.subtaskIndex
                && invocationId == that.invocationId
                && attemptId == that.attemptId
                && Objects.equals(pipelineName, that.pipelineName);
    }

    @Override
    public int hashCode() {
        return Objects.hash(pipelineName, subtaskIndex, invocationId, attemptId);
    }
}
