org.apache.kafka.streams.processor.internals.ChangelogRecordDeserializationHelper 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.processor.internals;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.common.header.Header;
import org.apache.kafka.common.header.internals.RecordHeader;
import org.apache.kafka.streams.errors.StreamsException;
import org.apache.kafka.streams.query.Position;
import org.apache.kafka.streams.state.internals.PositionSerde;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.nio.ByteBuffer;
/**
* Changelog records without any headers are considered old format.
* New format changelog records will have a version in their headers.
* Version 0: This indicates that the changelog records have consistency information.
*/
public class ChangelogRecordDeserializationHelper {
public static final Logger log = LoggerFactory.getLogger(ChangelogRecordDeserializationHelper.class);
private static final byte[] V_0_CHANGELOG_VERSION_HEADER_VALUE = {(byte) 0};
public static final String CHANGELOG_VERSION_HEADER_KEY = "v";
public static final String CHANGELOG_POSITION_HEADER_KEY = "c";
public static final RecordHeader CHANGELOG_VERSION_HEADER_RECORD_CONSISTENCY = new RecordHeader(
CHANGELOG_VERSION_HEADER_KEY, V_0_CHANGELOG_VERSION_HEADER_VALUE);
public static void applyChecksAndUpdatePosition(
final ConsumerRecord record,
final boolean consistencyEnabled,
final Position position
) {
if (!consistencyEnabled) {
return;
}
final Header versionHeader = record.headers().lastHeader(
ChangelogRecordDeserializationHelper.CHANGELOG_VERSION_HEADER_KEY);
if (versionHeader == null) {
return;
} else {
switch (versionHeader.value()[0]) {
case 0:
final Header vectorHeader = record.headers().lastHeader(CHANGELOG_POSITION_HEADER_KEY);
if (vectorHeader == null) {
throw new StreamsException("This should not happen. Consistency is enabled but the changelog "
+ "contains records without consistency information.");
}
position.merge(PositionSerde.deserialize(ByteBuffer.wrap(vectorHeader.value())));
break;
default:
log.warn("Changelog records have been encoded using a larger version than this server understands." +
"Please upgrade your server.");
}
}
}
}