Merge pull request #14021 from garyrussell:kafkaStreams
* pr/14021: Polish "Add Kafka Streams auto-configuration" Add Kafka Streams auto-configurationpull/14254/head
Stephane Nicoll
6 years ago
commit
f8ce714c88
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/*
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* Copyright 2012-2018 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.autoconfigure.kafka;
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import java.util.Map;
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import org.apache.kafka.streams.StreamsBuilder;
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import org.apache.kafka.streams.StreamsConfig;
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import org.springframework.beans.factory.InitializingBean;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
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import org.springframework.boot.context.properties.source.InvalidConfigurationPropertyValueException;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.core.env.Environment;
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import org.springframework.kafka.annotation.KafkaStreamsDefaultConfiguration;
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import org.springframework.kafka.config.KafkaStreamsConfiguration;
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import org.springframework.kafka.core.StreamsBuilderFactoryBean;
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/**
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* Configuration for Kafka Streams annotation-driven support.
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*
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* @author Gary Russell
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* @author Stephane Nicoll
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*/
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@Configuration
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@ConditionalOnClass(StreamsBuilder.class)
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@ConditionalOnBean(name = KafkaStreamsDefaultConfiguration.DEFAULT_STREAMS_BUILDER_BEAN_NAME)
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class KafkaStreamsAnnotationDrivenConfiguration {
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private final KafkaProperties properties;
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KafkaStreamsAnnotationDrivenConfiguration(KafkaProperties properties) {
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this.properties = properties;
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}
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@ConditionalOnMissingBean
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@Bean(KafkaStreamsDefaultConfiguration.DEFAULT_STREAMS_CONFIG_BEAN_NAME)
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public KafkaStreamsConfiguration defaultKafkaStreamsConfig(Environment environment) {
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Map<String, Object> streamsProperties = this.properties.buildStreamsProperties();
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if (this.properties.getStreams().getApplicationId() == null) {
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String applicationName = environment.getProperty("spring.application.name");
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if (applicationName != null) {
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streamsProperties.put(StreamsConfig.APPLICATION_ID_CONFIG,
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applicationName);
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}
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else {
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throw new InvalidConfigurationPropertyValueException(
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"spring.kafka.streams.application-id", null,
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"This property is mandatory and fallback 'spring.application.name' is not set either.");
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}
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}
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return new KafkaStreamsConfiguration(streamsProperties);
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}
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@Bean
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public KafkaStreamsFactoryBeanConfigurer kafkaStreamsFactoryBeanConfigurer(
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StreamsBuilderFactoryBean factoryBean) {
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return new KafkaStreamsFactoryBeanConfigurer(this.properties, factoryBean);
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}
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// Separate class required to avoid BeanCurrentlyInCreationException
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static class KafkaStreamsFactoryBeanConfigurer implements InitializingBean {
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private final KafkaProperties properties;
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private final StreamsBuilderFactoryBean factoryBean;
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KafkaStreamsFactoryBeanConfigurer(KafkaProperties properties,
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StreamsBuilderFactoryBean factoryBean) {
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this.properties = properties;
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this.factoryBean = factoryBean;
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}
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@Override
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public void afterPropertiesSet() {
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this.factoryBean.setAutoStartup(this.properties.getStreams().isAutoStartup());
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}
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}
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}
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@ -0,0 +1,53 @@
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/*
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* Copyright 2012-2018 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.docs.kafka;
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import org.apache.kafka.common.serialization.Serdes;
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import org.apache.kafka.streams.KeyValue;
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import org.apache.kafka.streams.StreamsBuilder;
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import org.apache.kafka.streams.kstream.KStream;
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import org.apache.kafka.streams.kstream.Produced;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.kafka.annotation.EnableKafkaStreams;
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import org.springframework.kafka.support.serializer.JsonSerde;
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/**
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* Example to show usage of {@link StreamsBuilder}.
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*
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* @author Stephane Nicoll
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*/
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public class KafkaStreamsBeanExample {
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// tag::configuration[]
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@Configuration
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@EnableKafkaStreams
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static class KafkaStreamsExampleConfiguration {
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@Bean
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public KStream<Integer, String> kStream(StreamsBuilder streamsBuilder) {
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KStream<Integer, String> stream = streamsBuilder.stream("ks1In");
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stream.map((k, v) -> new KeyValue(k, v.toUpperCase())).to("ks1Out",
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Produced.with(Serdes.Integer(), new JsonSerde<>()));
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return stream;
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}
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}
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// end::configuration[]
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}
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