org.apache.kafka.streams.state.internals.RecordConverters Maven / Gradle / Ivy
/*
* 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.streams.state.internals;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import java.nio.ByteBuffer;
public final class RecordConverters {
private static final RecordConverter IDENTITY_INSTANCE = record -> record;
@SuppressWarnings("deprecation")
private static final RecordConverter RAW_TO_TIMESTAMED_INSTANCE = record -> {
final byte[] rawValue = record.value();
final long timestamp = record.timestamp();
final byte[] recordValue = rawValue == null ? null :
ByteBuffer.allocate(8 + rawValue.length)
.putLong(timestamp)
.put(rawValue)
.array();
return new ConsumerRecord<>(
record.topic(),
record.partition(),
record.offset(),
timestamp,
record.timestampType(),
record.checksum(),
record.serializedKeySize(),
record.serializedValueSize(),
record.key(),
recordValue,
record.headers(),
record.leaderEpoch()
);
};
// privatize the constructor so the class cannot be instantiated (only used for its static members)
private RecordConverters() {}
public static RecordConverter rawValueToTimestampedValue() {
return RAW_TO_TIMESTAMED_INSTANCE;
}
public static RecordConverter identity() {
return IDENTITY_INSTANCE;
}
}