kafka RequestUtils 源码
kafka RequestUtils 代码
文件路径:/clients/src/main/java/org/apache/kafka/common/requests/RequestUtils.java
/*
* 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<Integer> 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<RecordBatch> predicate) {
for (ProduceRequestData.TopicProduceData tp : request.data().topicData()) {
for (ProduceRequestData.PartitionProduceData p : tp.partitionData()) {
if (p.records() instanceof Records) {
Iterator<? extends RecordBatch> 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();
}
}
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