kafka TimestampedTupleForwarder 源码
kafka TimestampedTupleForwarder 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/internals/TimestampedTupleForwarder.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.StateStore;
import org.apache.kafka.streams.processor.internals.InternalProcessorContext;
import org.apache.kafka.streams.state.internals.CacheFlushListener;
import org.apache.kafka.streams.state.internals.WrappedStateStore;
/**
* This class is used to determine if a processor should forward values to child nodes.
* Forwarding by this class only occurs when caching is not enabled. If caching is enabled,
* forwarding occurs in the flush listener when the cached store flushes.
*
* @param <K> the type of the key
* @param <V> the type of the value
*/
class TimestampedTupleForwarder<K, V> {
private final InternalProcessorContext<K, Change<V>> context;
private final boolean sendOldValues;
private final boolean cachingEnabled;
@SuppressWarnings({"unchecked", "rawtypes"})
TimestampedTupleForwarder(final StateStore store,
final ProcessorContext<K, Change<V>> context,
final CacheFlushListener<K, ?> flushListener,
final boolean sendOldValues) {
this.context = (InternalProcessorContext<K, Change<V>>) context;
this.sendOldValues = sendOldValues;
cachingEnabled = ((WrappedStateStore) store).setFlushListener(flushListener, sendOldValues);
}
TimestampedTupleForwarder(final ProcessorContext<K, Change<V>> context,
final boolean sendOldValues) {
this.context = (InternalProcessorContext<K, Change<V>>) context;
this.sendOldValues = sendOldValues;
cachingEnabled = false;
}
public void maybeForward(final Record<K, Change<V>> record) {
if (!cachingEnabled) {
if (sendOldValues) {
context.forward(record);
} else {
context.forward(record.withValue(new Change<>(record.value().newValue, null)));
}
}
}
}
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