001/* 002 * Copyright 2012-2018 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.boot.docs.kafka; 018 019import org.apache.kafka.common.serialization.Serdes; 020import org.apache.kafka.streams.KeyValue; 021import org.apache.kafka.streams.StreamsBuilder; 022import org.apache.kafka.streams.kstream.KStream; 023import org.apache.kafka.streams.kstream.Produced; 024 025import org.springframework.context.annotation.Bean; 026import org.springframework.context.annotation.Configuration; 027import org.springframework.kafka.annotation.EnableKafkaStreams; 028import org.springframework.kafka.support.serializer.JsonSerde; 029 030/** 031 * Example to show usage of {@link StreamsBuilder}. 032 * 033 * @author Stephane Nicoll 034 */ 035public class KafkaStreamsBeanExample { 036 037 // tag::configuration[] 038 @Configuration 039 @EnableKafkaStreams 040 static class KafkaStreamsExampleConfiguration { 041 042 @Bean 043 public KStream<Integer, String> kStream(StreamsBuilder streamsBuilder) { 044 KStream<Integer, String> stream = streamsBuilder.stream("ks1In"); 045 stream.map((k, v) -> new KeyValue<>(k, v.toUpperCase())).to("ks1Out", 046 Produced.with(Serdes.Integer(), new JsonSerde<>())); 047 return stream; 048 } 049 050 } 051 // end::configuration[] 052 053}