kafka KStreamBranch 源码
kafka KStreamBranch 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamBranch.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 java.util.List;
import org.apache.kafka.streams.kstream.Predicate;
import org.apache.kafka.streams.processor.api.ContextualProcessor;
import org.apache.kafka.streams.processor.api.Processor;
import org.apache.kafka.streams.processor.api.ProcessorSupplier;
import org.apache.kafka.streams.processor.api.Record;
class KStreamBranch<K, V> implements ProcessorSupplier<K, V, K, V> {
private final List<Predicate<? super K, ? super V>> predicates;
private final List<String> childNodes;
KStreamBranch(final List<Predicate<? super K, ? super V>> predicates,
final List<String> childNodes) {
this.predicates = predicates;
this.childNodes = childNodes;
}
@Override
public Processor<K, V, K, V> get() {
return new KStreamBranchProcessor();
}
private class KStreamBranchProcessor extends ContextualProcessor<K, V, K, V> {
@Override
public void process(final Record<K, V> record) {
for (int i = 0; i < predicates.size(); i++) {
if (predicates.get(i).test(record.key(), record.value())) {
// use forward with child here and then break the loop
// so that no record is going to be piped to multiple streams
context().forward(record, childNodes.get(i));
return;
}
}
// using default child node if supplied
if (childNodes.size() > predicates.size()) {
context().forward(record, childNodes.get(predicates.size()));
}
}
}
}
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