How to use RabbitMQ with Springboot and Apache Camel ?

Jasvinder S Saggu

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Jul 7, 2021

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pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.4.7</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.jss</groupId>
   <artifactId>camel</artifactId>
   <version>0.0.2-SNAPSHOT</version>
   <name>camel</name>
   <description>Apache Camel with Spring Boot</description>

   <properties>
      <java.version>1.8</java.version>
      <junit.platform.version>1.6.0</junit.platform.version>
      <camel.version>3.7.3</camel.version>
   </properties>

   <dependencies>
      <dependency>
         <groupId>org.apache.camel.springboot</groupId>
         <artifactId>camel-spring-boot-starter</artifactId>
         <version>${camel.version}</version>
      </dependency>

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

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

      <dependency>
         <groupId>org.apache.camel</groupId>
         <artifactId>camel-test</artifactId>
         <scope>test</scope>
         <version>${camel.version}</version>
      </dependency>

      <dependency>
         <groupId>org.apache.camel</groupId>
         <artifactId>camel-rabbitmq</artifactId>
         <version>${camel.version}</version>
      </dependency>

      <dependency>
         <groupId>org.apache.camel</groupId>
         <artifactId>camel-jackson</artifactId>
         <version>${camel.version}</version>
      </dependency>

      <dependency>
         <groupId>org.apache.camel</groupId>
         <artifactId>camel-jaxb</artifactId>
         <version>${camel.version}</version>
      </dependency>

      <dependency>
         <groupId>org.projectlombok</groupId>
         <artifactId>lombok</artifactId>
         <optional>true</optional>
         <version>1.18.12</version>
      </dependency>

      <dependency>
         <groupId>org.apache.camel</groupId>
         <artifactId>camel-servlet</artifactId>
         <version>${camel.version}</version>
      </dependency>

      <dependency>
         <groupId>org.apache.camel.springboot</groupId>
         <artifactId>camel-servlet-starter</artifactId>
         <version>${camel.version}</version>
      </dependency>

      <dependency>
         <groupId>org.apache.camel.springboot</groupId>
         <artifactId>camel-rest-starter</artifactId>
         <version>${camel.version}</version>
      </dependency>

      <dependency>
         <groupId>org.junit.platform</groupId>
         <artifactId>junit-platform-runner</artifactId>
         <version>${junit.platform.version}</version>
         <scope>test</scope>
      </dependency>

      <dependency>
         <groupId>org.junit.vintage</groupId>
         <artifactId>junit-vintage-engine</artifactId>
         <version>5.7.0</version>
         <scope>test</scope>
      </dependency>

      <dependency>
         <groupId>org.apache.camel</groupId>
         <artifactId>camel-test-junit5</artifactId>
         <version>${camel.version}</version>
         <scope>test</scope>
      </dependency>

      <dependency>
         <groupId>org.apache.camel</groupId>
         <artifactId>camel-test-spring-junit5</artifactId>
         <version>${camel.version}</version>
         <scope>test</scope>
      </dependency>

   </dependencies>

   <build>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>
      </plugins>
   </build>

</project>

CamelConfiguration.java

package com.jss.config;

import com.rabbitmq.client.ConnectionFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class CamelConfiguration {

    public static final String RABBIT_URI = "rabbitmq:amq.direct?queue=%s&routingKey=%s&autoDelete=false";

    @Bean
    public ConnectionFactory rabbitConnectionFactory() {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setUsername("guest");
        factory.setPassword("guest");
        return factory;
    }
}

Weather.java

package com.jss.camel.dto;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class WeatherDto implements Serializable {
    static int counter = 1;
    private int id = counter++;

    private String city;
    private String temp;
    private String unit;
    private String receivedTime;
}

WeatherRoute.java

package com.jss.camel.components.routes;

import com.jss.camel.dto.WeatherDto;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.model.dataformat.JsonLibrary;
import org.apache.camel.support.DefaultMessage;
import org.springframework.stereotype.Component;

import java.util.Date;

import static com.jss.config.CamelConfiguration.RABBIT_URI;
import static org.apache.camel.LoggingLevel.ERROR;

@Component
public class WeatherRoute extends RouteBuilder {

    @Override
    public void configure() throws Exception {
        fromF(RABBIT_URI, "weather", "weather")
                .log(ERROR, "Before Enrichment: ${body}")
                .unmarshal().json(JsonLibrary.Jackson, WeatherDto.class)
                .process(this::enrichWeatherDto)
                .log(ERROR, "After Enrichment: ${body}")
                .marshal().json(JsonLibrary.Jackson, WeatherDto.class)
                .toF(RABBIT_URI, "weather-events", "weather-events")
                .to("file:///Users/jasvinder.saggu/projects/temp/camel-demos/?fileName=weather-events.txt&fileExist=Append")
        ;
    }

    private void enrichWeatherDto(Exchange exchange) {
        WeatherDto dto = exchange.getMessage().getBody(WeatherDto.class);
        dto.setReceivedTime(new Date().toString());

        Message message = new DefaultMessage(exchange);
        message.setBody(dto);
        exchange.setMessage(message);
    }
}