StreamsDSLExample.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;

import org.apache.kafka.common.serialization.Serdes;

import java.util.Properties;

public class StreamsDSLExample {

    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 StreamsBuilder builder = new StreamsBuilder();

        builder.<String, String>stream("input")
               .filter((k,v) -> v.endsWith("FOO"))
               .mapValues(v -> v.substring(0,3))
               .to("output");

        final Topology topology = builder.build(properties);
       
        final KafkaStreams streams = new KafkaStreams(topology, properties);
        streams.start()


    }
}