/*
* 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.streams.processor.ProcessorContext;
import org.apache.kafka.streams.processor.internals.InternalProcessorContext;
import org.apache.kafka.streams.processor.internals.ProcessorNode;
class ForwardingCacheFlushListener<K, V> implements CacheFlushListener<K, V> {
private final InternalProcessorContext context;
private final boolean sendOldValues;
private final ProcessorNode myNode;
ForwardingCacheFlushListener(final ProcessorContext context, final boolean sendOldValues) {
this.context = (InternalProcessorContext) context;
myNode = this.context.currentNode();
this.sendOldValues = sendOldValues;
}
@Override
public void apply(final K key, final V newValue, final V oldValue) {
final ProcessorNode prev = context.currentNode();
context.setCurrentNode(myNode);
try {
if (sendOldValues) {
context.forward(key, new Change<>(newValue, oldValue));
} else {
context.forward(key, new Change<>(newValue, null));
}
} finally {
context.setCurrentNode(prev);
}
}
}