– Tutorial: “Spring Boot Rabbitmq Multiple Consumers Example using RabbitMq Exchange to Exchange Topology – Spring Boot Rabbitmq Multiple Listeners”

In the post, I show you how to work with SpringBoot RabbitMq Exchange to Exchange Topology to develop an example “Rabbitmq Multiple Queues and Multiple Listeners”.

* Technologies:

– Java 8
– Maven
– Spring Tool Suite
– Spring Boot
– RabbitMq

RabbitMq Exchange to Exchange – Spring Boot Rabbitmq Multiple Consumers Example

We create a RabbitMQ topology with 2 topic exchanges and 3 binding queues:

Scenarios with above design:
– when we send a message with routing key: sys.prod.info, it will be delivered by path: X1 -> Q3.
– when we send a message with routing key: app.prod.error, it will be delivered by path: X1 -> X2 -> {Q2, Q3}.
– when we send a message with routing key: sys.test.error, it will be delivered by path: X1 -> X2 -> Q1.

Practices – Spring Boot Rabbitmq Multiple Consumers Example

In the tutorial, we create 2 SpringBoot project as below:

– Step to do:
– Create SpringBoot projects
– Define data model
– Implement RabbitMq Producer
– Implement RabbitMq consumer
– Run and check results

Create SpringBoot projects

Using SpringToolSuite, create 2 SpringBoot projects, then add need dependency spring-boot-starter-amqp:

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-amqp</artifactId>
</dependency>

Define Spring Data Model – Spring Boot Rabbitmq Multiple Consumers Example

Create Log data model for both projects:

package com.loizenjava.rabbitmq.model;
 
public class Log {
	private String content;
	private String routingKey;
	
	public Log(){};
	
	public Log(String content, String routingKey){
		this.content = content;
		this.routingKey = routingKey;
	}
	
	public String getContent(){
		return this.content;
	}
	
	public void setContent(String content){
		this.content = content;
	}
	
	public String getRoutingKey(){
		return this.routingKey;
	}
	
	public void setRoutingKey(String routingKey){
		this.routingKey = routingKey;
	}
	
	@Override
	public String toString() {
		return String.format("{content = %s, routingKey = %s}", content, routingKey);
	}
}

Now it’s time for implementation. Let’s go!

Configure SpringBoot RabbitMq Producer – Spring Boot Rabbitmq Multiple Consumers Example

package com.loizenjava.rabbitmq.config;
 
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.amqp.support.converter.MessageConverter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
public class RabbitMqConfig {
	
    @Bean
    public MessageConverter jsonMessageConverter(){
        return new Jackson2JsonMessageConverter();
    }
    
    public AmqpTemplate rabbitTemplate(ConnectionFactory connectionFactory) {
        final RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
        rabbitTemplate.setMessageConverter(jsonMessageConverter());
        return rabbitTemplate;
    }
}

Open application.properties, add configuration:

spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
jsa.rabbitmq.exchange=jsa.exchange.logs
jsa.rabbitmq.queue=jsa.queue
jsa.rabbitmq.routingkey=jsa.routingkey

Implement SpringBoot RabbitMq Producer

package com.loizenjava.rabbitmq.producer;
 
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
 
import com.loizenjava.rabbitmq.model.Log;
 
@Component
public class Producer {
	
	@Autowired
	private AmqpTemplate amqpTemplate;
	
	@Value("${jsa.rabbitmq.exchange}")
	private String exchange;
	
	public void produce(Log logs){
		String routingKey = logs.getRoutingKey();
		amqpTemplate.convertAndSend(exchange, routingKey, logs);
		System.out.println("Send msg = " + logs);
	}
}

Implement SpringBoot RabbitMQ Producer Client

package com.loizenjava.rabbitmq;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
import com.loizenjava.rabbitmq.model.Log;
import com.loizenjava.rabbitmq.producer.Producer;
 
@SpringBootApplication
public class SpringRabbitMqProducerApplication  implements CommandLineRunner{
 
	public static void main(String[] args) {
		SpringApplication.run(SpringRabbitMqProducerApplication.class, args);
	}
	
	@Autowired
	Producer producer;
 
	@Override
	public void run(String... args) throws Exception {
		
		/**
		 *  1
		 */
		String content = "2014-03-05 10:58:51.1  INFO 45469 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/7.0.52";
		String routingKey = "sys.dev.info";
		
		// send to RabbitMQ
		producer.produce(new Log(content, routingKey));
		
		/**
		 *  2
		 */
		content = "2017-10-10 10:57:51.10 ERROR in [email protected]:71 - no applicable action for [springProperty], current ElementPath is [[configuration][springProperty]]";
		routingKey = "sys.test.error";
		
		// send to RabbitMQ
		producer.produce(new Log(content, routingKey));
		
		/**
		 *  3
		 */
		content = "2017-10-10 10:57:51.112  ERROR java.lang.Exception: java.lang.Exception";
		routingKey = "app.prod.error";
		
		// send to RabbitMQ
		producer.produce(new Log(content, routingKey));
	}
}

Configure SpringBoot RabbitMQ Consumer

package com.loizenjava.rabbitmq.config;
 
import org.springframework.amqp.rabbit.config.SimpleRabbitListenerContainerFactory;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.amqp.support.converter.MessageConverter;
import org.springframework.boot.autoconfigure.amqp.SimpleRabbitListenerContainerFactoryConfigurer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
public class RabbitMqConfig {
	
    @Bean
    public MessageConverter jsonMessageConverter(){
        return new Jackson2JsonMessageConverter();
    }
    
    @Bean
    public SimpleRabbitListenerContainerFactory jsaFactory(ConnectionFactory connectionFactory,
            SimpleRabbitListenerContainerFactoryConfigurer configurer) {
        SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
        configurer.configure(factory, connectionFactory);
        factory.setMessageConverter(jsonMessageConverter());
        return factory;
    }
}

Open application.properties, add configuration:

spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
jsa.rabbitmq.queue=jsa.queue.logs.application-error
#jsa.rabbitmq.queue=jsa.queue.logs.system-error
#jsa.rabbitmq.queue=jsa.queue.logs.production

Implement SpringBoot RabbitMQ Consumer

package com.loizenjava.rabbitmq.consumer;

import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;

import com.loizenjava.rabbitmq.model.Log;

@Component
public class Consumer {
	
    @RabbitListener(queues="${jsa.rabbitmq.queue}", containerFactory="jsaFactory")
    public void recievedMessage(Log logs) {
        System.out.println("Recieved Message: " + logs);
    }
}

Run and Check Results – Spring Boot Rabbitmq Multiple Consumers Example

– Setup RabbitMq exchange, queues:

Enable rabbitmq_management by cmd: rabbitmq-plugins enable rabbitmq_management --online. Then go to: http://localhost:15672 -> login with user/password: guest/guest.

– Add RabbitMQ exchanges:

Go to http://localhost:15672/#/exchanges, add 2 exchanges: {jsa.exchange.logs, jsa.exchange.logs.error}.

– Add RabbitMQ Queue:

Go to http://localhost:15672/#/queues, add 3 queues: {jsa.queue.logs.application-error, jsa.queue.logs.system-error, jsa.queue.logs.production}.

– Binding the queues & exchanges:

– Run SpringBoot-RabbitMQ-Producer with commandline mvn spring-boot:run,

-> Console’s logs:

Send msg = {content = 2014-03-05 10:58:51.1  INFO 45469 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/7.0.52, routingKey = sys.prod.info}
Send msg = {content = 2017-10-10 10:57:51.10 ERROR in [email protected]:71 - no applicable action for [springProperty], current ElementPath is [[configuration][springProperty]], routingKey = sys.test.error}
Send msg = {content = 2017-10-10 10:57:51.112  ERROR java.lang.Exception: java.lang.Exception, routingKey = app.prod.error}

– See queues’ status:

– Run SpringBoot-RabbitMQ-Consumer which listen to jsa.queue.logs.application-error queue with configuration:

jsa.rabbitmq.queue=jsa.queue.logs.application-error:

– Console’s logs:

Recieved Message: {content = 2017-10-10 10:57:51.112  ERROR java.lang.Exception: java.lang.Exception, routingKey = app.prod.error}

– Run SpringBoot-RabbitMQ-Consumer which listen to jsa.queue.logs.system-error queue with configuration:

jsa.rabbitmq.queue=jsa.queue.logs.system-error:

-> Console’s logs:

Recieved Message: {content = 2017-10-10 10:57:51.10 ERROR in [email protected]:71 - no applicable action for [springProperty], current ElementPath is [[configuration][springProperty]], routingKey = sys.test.error}

– Run SpringBoot-RabbitMQ-Consumer which listen to jsa.queue.logs.production queue with configuration:

jsa.rabbitmq.queue=jsa.queue.logs.production:

– Console’s logs:

Recieved Message: {content = 2014-03-05 10:58:51.1  INFO 45469 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/7.0.52, routingKey = sys.prod.info}
Recieved Message: {content = 2017-10-10 10:57:51.112  ERROR java.lang.Exception: java.lang.Exception, routingKey = app.prod.error}

Read More

– Reference Link: RabbitMQ Exchange Topic

SourceCode

– SpringBoot-RabbitMQ-Producer
– SpringBoot-RabbitMQ-Consumer