org.s1p.app6.S1pKafkaApplication.java Source code

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Here is the source code for org.s1p.app6.S1pKafkaApplication.java

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/*
 * Copyright 2016 the original author or authors.
 *
 * Licensed 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.s1p.app6;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import org.s1p.Bar;
import org.s1p.CommonConfiguration;
import org.s1p.ConfigProperties;
import org.s1p.Foo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;
import org.springframework.kafka.annotation.EnableKafka;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.core.ProducerFactory;
import org.springframework.kafka.support.converter.StringJsonMessageConverter;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.GenericMessage;

/**
 * @author Gary Russell
 *
 */
@SpringBootApplication
@Import({ CommonConfiguration.class, ConfigProperties.class })
@EnableKafka
public class S1pKafkaApplication {

    public static void main(String[] args) throws Exception {
        ConfigurableApplicationContext context = new SpringApplicationBuilder(S1pKafkaApplication.class).web(false)
                .run(args);
        TestBean testBean = context.getBean(TestBean.class);
        testBean.send(new GenericMessage<>(new Foo("foo", "bar")));
        context.getBean(Listener.class).latch.await(60, TimeUnit.SECONDS);
        context.close();
    }

    @Bean
    public TestBean test() {
        return new TestBean();
    }

    @Bean
    public Listener listener() {
        return new Listener();
    }

    @Bean
    public KafkaTemplate<String, String> kafkaTemplate(ProducerFactory<String, String> producerFactory,
            ConfigProperties config) {
        KafkaTemplate<String, String> kafkaTemplate = new KafkaTemplate<>(producerFactory);
        kafkaTemplate.setMessageConverter(new StringJsonMessageConverter());
        kafkaTemplate.setDefaultTopic(config.getFooTopic());
        return kafkaTemplate;
    }

    public static class TestBean {

        @Autowired
        private KafkaTemplate<String, ?> template;

        public void send(Message<?> foo) {
            this.template.send(foo);
        }

    }

    public static class Listener {

        private final CountDownLatch latch = new CountDownLatch(1);

        @KafkaListener(topics = "${kafka.fooTopic}", containerFactory = "jsonKafkaListenerContainerFactory")
        public void listen(Bar bar) {
            System.out.println("Received: " + bar);
            this.latch.countDown();
        }

    }

}