kafka ChangeLoggingListValueBytesStore 源码
kafka ChangeLoggingListValueBytesStore 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/state/internals/ChangeLoggingListValueBytesStore.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.state.internals;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.streams.state.KeyValueStore;
public class ChangeLoggingListValueBytesStore extends ChangeLoggingKeyValueBytesStore {
ChangeLoggingListValueBytesStore(final KeyValueStore<Bytes, byte[]> inner) {
super(inner);
}
@Override
public void put(final Bytes key, final byte[] value) {
wrapped().put(key, value);
// the provided new value will be added to the list in the inner put()
// we need to log the full new list and thus call get() on the inner store below
// if the value is a tombstone, we delete the whole list and thus can save the get call
if (value == null) {
log(key, null);
} else {
log(key, wrapped().get(key));
}
}
@Override
public byte[] putIfAbsent(final Bytes key, final byte[] value) {
final byte[] oldValue = wrapped().get(key);
if (oldValue != null) {
put(key, value);
}
// TODO: here we always return null so that deser would not fail.
// we only do this since we know the only caller (stream-stream join processor)
// would not need the actual value at all
return null;
}
}
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