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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.channel;

import org.apache.flink.annotation.Internal;

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

/**
 * Identifies {@link org.apache.flink.runtime.io.network.partition.consumer.InputChannel} in a given
 * subtask. Note that {@link org.apache.flink.runtime.io.network.partition.consumer.InputChannelID
 * InputChannelID} can not be used because it is generated randomly.
 */
@Internal
public class InputChannelInfo implements Serializable {
    private static final long serialVersionUID = 1L;

    private final int gateIdx;
    private final int inputChannelIdx;

    public InputChannelInfo(int gateIdx, int inputChannelIdx) {
        this.gateIdx = gateIdx;
        this.inputChannelIdx = inputChannelIdx;
    }

    public int getGateIdx() {
        return gateIdx;
    }

    public int getInputChannelIdx() {
        return inputChannelIdx;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        final InputChannelInfo that = (InputChannelInfo) o;
        return gateIdx == that.gateIdx && inputChannelIdx == that.inputChannelIdx;
    }

    @Override
    public int hashCode() {
        return Objects.hash(gateIdx, inputChannelIdx);
    }

    @Override
    public String toString() {
        return "InputChannelInfo{"
                + "gateIdx="
                + gateIdx
                + ", inputChannelIdx="
                + inputChannelIdx
                + '}';
    }
}