org.s1p.app7.S1pKafkaApplication.java Source code

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Here is the source code for org.s1p.app7.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.app7;

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

import org.s1p.CommonConfiguration;
import org.s1p.ConfigProperties;

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;

/**
 * @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("foo");
        testBean.send("bar");
        testBean.send("baz");
        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();
    }

    public static class TestBean {

        @Autowired
        private ConfigProperties configProperties;

        @Autowired
        private KafkaTemplate<String, String> template;

        public void send(String foo) {
            this.template.send(this.configProperties.getTopic(), foo);
        }

    }

    public static class Listener {

        private final CountDownLatch latch = new CountDownLatch(3);

        private int count;

        @KafkaListener(topics = "${kafka.topic}", containerFactory = "retryKafkaListenerContainerFactory")
        public void listen(String foo) {
            System.out.println("Received: " + foo + " attempt " + ++count);
            if (this.count < 3) {
                throw new RuntimeException("retry");
            }
            System.out.println("Success: " + foo);
            this.count = 0;
            this.latch.countDown();
        }

    }

}