kafka TimestampedCacheFlushListener 源码
kafka TimestampedCacheFlushListener 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/internals/TimestampedCacheFlushListener.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.streams.processor.api.ProcessorContext;
import org.apache.kafka.streams.processor.api.Record;
import org.apache.kafka.streams.processor.internals.InternalProcessorContext;
import org.apache.kafka.streams.processor.internals.ProcessorNode;
import org.apache.kafka.streams.state.ValueAndTimestamp;
import org.apache.kafka.streams.state.internals.CacheFlushListener;
import static org.apache.kafka.streams.state.ValueAndTimestamp.getValueOrNull;
class TimestampedCacheFlushListener<KOut, VOut> implements CacheFlushListener<KOut, ValueAndTimestamp<VOut>> {
private final InternalProcessorContext<KOut, Change<VOut>> context;
@SuppressWarnings("rawtypes")
private final ProcessorNode myNode;
TimestampedCacheFlushListener(final ProcessorContext<KOut, Change<VOut>> context) {
this.context = (InternalProcessorContext<KOut, Change<VOut>>) context;
myNode = this.context.currentNode();
}
@Override
public void apply(final Record<KOut, Change<ValueAndTimestamp<VOut>>> record) {
@SuppressWarnings("rawtypes") final ProcessorNode prev = context.currentNode();
context.setCurrentNode(myNode);
try {
context.forward(
record
.withValue(
new Change<>(
getValueOrNull(record.value().newValue),
getValueOrNull(record.value().oldValue)))
.withTimestamp(
record.value().newValue != null ? record.value().newValue.timestamp()
: record.timestamp())
);
} finally {
context.setCurrentNode(prev);
}
}
}
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