kafka KStreamJoinWindow 源码
kafka KStreamJoinWindow 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamJoinWindow.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.ContextualProcessor;
import org.apache.kafka.streams.processor.api.Processor;
import org.apache.kafka.streams.processor.api.ProcessorContext;
import org.apache.kafka.streams.processor.api.ProcessorSupplier;
import org.apache.kafka.streams.processor.api.Record;
import org.apache.kafka.streams.state.WindowStore;
class KStreamJoinWindow<K, V> implements ProcessorSupplier<K, V, K, V> {
private final String windowName;
KStreamJoinWindow(final String windowName) {
this.windowName = windowName;
}
@Override
public Processor<K, V, K, V> get() {
return new KStreamJoinWindowProcessor();
}
private class KStreamJoinWindowProcessor extends ContextualProcessor<K, V, K, V> {
private WindowStore<K, V> window;
@Override
public void init(final ProcessorContext<K, V> context) {
super.init(context);
window = context.getStateStore(windowName);
}
@Override
public void process(final Record<K, V> record) {
// if the key is null, we do not need to put the record into window store
// since it will never be considered for join operations
if (record.key() != null) {
context().forward(record);
// Every record basically starts a new window. We're using a window store mostly for the retention.
window.put(record.key(), record.value(), record.timestamp());
}
}
}
}
相关信息
相关文章
kafka AbstractKStreamTimeWindowAggregateProcessor 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
7、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦