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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.requests;

import org.apache.kafka.common.message.ProduceRequestData;
import org.apache.kafka.common.protocol.ByteBufferAccessor;
import org.apache.kafka.common.protocol.Message;
import org.apache.kafka.common.protocol.ObjectSerializationCache;
import org.apache.kafka.common.record.RecordBatch;
import org.apache.kafka.common.record.Records;

import java.nio.ByteBuffer;
import java.util.Iterator;
import java.util.Optional;
import java.util.function.Predicate;

public final class RequestUtils {

    private RequestUtils() {}

    public static Optional getLeaderEpoch(int leaderEpoch) {
        return leaderEpoch == RecordBatch.NO_PARTITION_LEADER_EPOCH ?
            Optional.empty() : Optional.of(leaderEpoch);
    }

    public static boolean hasTransactionalRecords(ProduceRequest request) {
        return flag(request, RecordBatch::isTransactional);
    }

    /**
     * find a flag from all records of a produce request.
     * @param request produce request
     * @param predicate used to predicate the record
     * @return true if there is any matched flag in the produce request. Otherwise, false
     */
    static boolean flag(ProduceRequest request, Predicate predicate) {
        for (ProduceRequestData.TopicProduceData tp : request.data().topicData()) {
            for (ProduceRequestData.PartitionProduceData p : tp.partitionData()) {
                if (p.records() instanceof Records) {
                    Iterator iter = (((Records) p.records())).batchIterator();
                    if (iter.hasNext() && predicate.test(iter.next())) return true;
                }
            }
        }
        return false;
    }

    public static ByteBuffer serialize(
        Message header,
        short headerVersion,
        Message apiMessage,
        short apiVersion
    ) {
        ObjectSerializationCache cache = new ObjectSerializationCache();

        int headerSize = header.size(cache, headerVersion);
        int messageSize = apiMessage.size(cache, apiVersion);
        ByteBufferAccessor writable = new ByteBufferAccessor(ByteBuffer.allocate(headerSize + messageSize));

        header.write(writable, cache, headerVersion);
        apiMessage.write(writable, cache, apiVersion);

        writable.flip();
        return writable.buffer();
    }
}