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/* | |
* 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; | |
import kafka.Kafka; | |
import org.apache.kafka.common.serialization.Serdes; | |
import org.apache.kafka.streams.processor.AbstractProcessor; | |
import org.apache.kafka.streams.processor.To; | |
import java.util.Properties; | |
public class ProcessorAPIExample { | |
public static void main(String[] args) { | |
final Properties properties = new Properties(); | |
properties.setProperty(StreamsConfig.APPLICATION_ID_CONFIG, "test-application"); | |
properties.setProperty(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092"); | |
properties.setProperty(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName()); | |
properties.setProperty(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName()); | |
final Topology topology = new Topology(); | |
topology.addSource("SourceTopicProcessor","input" ); | |
topology.addProcessor("FilteringProcessor", FilterProcessor::new, "SourceTopicProcessor"); | |
topology.addProcessor("MappingProcessor", MapValuesProcessor::new, "FilteringProcessor"); | |
topology.addSink("SinkProcessor", "output", "MappingProcessor"); | |
System.out.println(builder.describe()); | |
final KafkaStreams streams = new KafkaStreams(builder, properties); | |
streams.start(); | |
} | |
static class FilterProcessor extends AbstractProcessor<String, String> { | |
@Override | |
public void process(String key, String value) { | |
if (value.endsWith("FOO")) { | |
context().forward(key, value); | |
} | |
} | |
} | |
static class MapValuesProcessor extends AbstractProcessor<String, String> { | |
@Override | |
public void process(String key, String value) { | |
context().forward(key, value.substring(0,3)); | |
// Processor API gives flexibility to forward KV pairs | |
// to arbitrary child nodes | |
//context().forward(key, value.substring(0,3), To.child("some node")); | |
} | |
} | |
} |
nicodom
commented
Sep 23, 2019
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