kafka ChangedDeserializer 源码
kafka ChangedDeserializer 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/internals/ChangedDeserializer.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.streams.kstream.internals;
import org.apache.kafka.common.header.Headers;
import org.apache.kafka.common.serialization.Deserializer;
import org.apache.kafka.streams.processor.internals.SerdeGetter;
import java.nio.ByteBuffer;
public class ChangedDeserializer<T> implements Deserializer<Change<T>>, WrappingNullableDeserializer<Change<T>, Void, T> {
private static final int NEWFLAG_SIZE = 1;
private Deserializer<T> inner;
public ChangedDeserializer(final Deserializer<T> inner) {
this.inner = inner;
}
public Deserializer<T> inner() {
return inner;
}
@SuppressWarnings("unchecked")
@Override
public void setIfUnset(final SerdeGetter getter) {
if (inner == null) {
inner = (Deserializer<T>) getter.valueSerde().deserializer();
}
}
@Override
public Change<T> deserialize(final String topic, final Headers headers, final byte[] data) {
final byte[] bytes = new byte[data.length - NEWFLAG_SIZE];
System.arraycopy(data, 0, bytes, 0, bytes.length);
if (ByteBuffer.wrap(data).get(data.length - NEWFLAG_SIZE) != 0) {
return new Change<>(inner.deserialize(topic, headers, bytes), null);
} else {
return new Change<>(null, inner.deserialize(topic, headers, bytes));
}
}
@Override
public Change<T> deserialize(final String topic, final byte[] data) {
return deserialize(topic, null, data);
}
@Override
public void close() {
inner.close();
}
}
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