What is SEDA and How to implement SEDA usingApache Camel ? | Software Architecture Pattern

Jasvinder S Saggu

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Jul 3, 2021

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• The SEDA component provides asynchronous SEDA behaviour
• Messages are exchanged on a BlockingQueue and consumers are invoked in a separate thread from the producer
• Queues are only visible within a single CamelContext
• This component does not implement any kind of persistence or recover
• URI Format
• seda:some-name?options

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>0.0.1-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-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.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>

CamelApplication.java

package com.jss.camel;

import org.apache.camel.ProducerTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.concurrent.TimeUnit;

@SpringBootApplication
public class CamelApplication {
   @Autowired
   ProducerTemplate producerTemplate;

   public static void main(String[] args) throws InterruptedException {
      SpringApplication.run(CamelApplication.class, args);
      TimeUnit.SECONDS.sleep(20);
   }
}

SedaRoute.java

package com.jss.camel.components;

import org.apache.camel.Message;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.support.DefaultMessage;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.stereotype.Component;

import java.util.Date;

import static java.util.concurrent.TimeUnit.SECONDS;
import static org.apache.camel.LoggingLevel.ERROR;

@Component
@ConditionalOnProperty(name = "jss.camel.seda.enabled", havingValue = "true", matchIfMissing = true)
public class SedaRoute extends RouteBuilder {
    @Override
    public void configure() {
        from("timer:ping?period=200")
                .process(exchange -> {
                    Message message = new DefaultMessage(exchange);
                    message.setBody(new Date());
                    exchange.setMessage(message);
                })
                .to("seda:weightLifter?multipleConsumers=true");

        from("seda:weightLifter?multipleConsumers=true")
                .to("direct:complexProcess");

        from("direct:complexProcess")
                .log(ERROR, "${body}")
                .process(exchange -> SECONDS.sleep(2))
                .end();
    }
}