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Apache Jena Fuseki server Kafka connector

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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.kafka.common.utils;

import org.apache.kafka.common.record.RecordBatch;

public class ProducerIdAndEpoch {
    public static final ProducerIdAndEpoch NONE = new ProducerIdAndEpoch(RecordBatch.NO_PRODUCER_ID, RecordBatch.NO_PRODUCER_EPOCH);

    public final long producerId;
    public final short epoch;

    public ProducerIdAndEpoch(long producerId, short epoch) {
        this.producerId = producerId;
        this.epoch = epoch;
    }

    public boolean isValid() {
        return RecordBatch.NO_PRODUCER_ID < producerId;
    }

    @Override
    public String toString() {
        return "(producerId=" + producerId + ", epoch=" + epoch + ")";
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        ProducerIdAndEpoch that = (ProducerIdAndEpoch) o;

        if (producerId != that.producerId) return false;
        return epoch == that.epoch;
    }

    @Override
    public int hashCode() {
        int result = (int) (producerId ^ (producerId >>> 32));
        result = 31 * result + (int) epoch;
        return result;
    }

}