About Nitin Kumar

Nitin Kumar works as a Solution Architecture in Wipro Technologies specialize in SOA. He has over twelve years of experience in information technology architecting and developing software systems, focus mainly on JEE solutions.

Spring Integration: A lightweight integration Approach

Today’s application expects access of all business in enterprise environment regardless of application technologies, which require, seamless integration with desperate systems. This integration can be achieved through wiring of desperate systems using Middleware technologies.

Integration platform enables environment for applications to share information with each other to make architecture high interoperable. Spring Integration provides a mediation framework to build lightweight integration solution using routing and mediation, regardless of protocols. The Spring Integration is lightweight routing and mediation framework and doesn’t need heavy weight ESB container to deploy.

Spring Integration uses Message object to communicate, route and pass the data, which is nothing, but a wrapper on Java object consists of payload and header. Payload consist data which could be any type such as File, String, stream etc. and header consist generic information on message such as id, timestamp etc.

Message communicates to producer via channel, which decoupled source from destination and post the message to any protocols such as JMS, HTTP, Ldap, file etc. Producers send Messages to a channel, and consumers receive Messages from a channel

spring-integration_simple

Simple Integration Application

Below example show how producer send an employee object to channel and publisher receive message from channel.

Spring Dependency Maven configuration

For starting simple integration example we just need to add the core spring integration and spring context dependency to maven pom.xml. Moreover we also need Junit and spring test to enable unit testing

<properties>
 <spring.framework.version>3.2.3.RELEASE</spring.framework.version>
 <spring.integration.version>2.2.4.RELEASE</spring.integration.version>
 <junit.version>4.11</junit.version>
 </properties>
 <dependencies>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-context</artifactId>
 <version>${spring.framework.version}</version>
 </dependency>
 <dependency>
 <groupId>org.springframework.integration</groupId>
 <artifactId>spring-integration-core</artifactId>
 <version>${spring.integration.version}</version>
 </dependency>
 <dependency>
 <groupId>junit</groupId>
 <artifactId>junit</artifactId>
 <version>${junit.version}</version>
 <scope>test</scope>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-test</artifactId>
 <version>${spring.framework.version}</version>
 <scope>test</scope>
 </dependency>
 </dependencies>

Spring Configuration
We have to configure channel and gateway in spring configuration to send and receive message

SpringIntegTest-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/integration"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration-2.2.xsd">
 <!--
 sendRequest
 receiveRequest
 -->
 <annotation-config/>
 <context:component-scan base-package="org.springsample.integration"/>
 <gateway id="request" service-interface="org.springsample.integration.SentRequest"/>
 <channel id="sendRequest"/>
 <outbound-channel-adapter channel="sendRequest" ref="receiveResponse" method="processMessage" />
</beans:beans>

Here we created request gateway to send the message to channel and outbound adapter to receive message from the sendRequest channel. Gateway of Spring Integration is entry points to send messages, which specify using Java Interface. Spring Integration automatically define proxy implementation at runtime

Request and Receive

Below we create the SentRequest and ReceiveResponse class to send and receive message as follows

SentRequest.java

package org.springsample.integration;
import org.springframework.integration.annotation.Gateway;
public interface SentRequest {
 @Gateway(requestChannel="sendRequest")
 public void process(Employee emp);

}

@Gateway annotation will indicate entry point to send message

package org.springsample.integration;
import org.springframework.integration.Message;
import org.springframework.integration.annotation.MessageEndpoint;
@MessageEndpoint
public class ReceiveResponse {
public void processMessage(Message<Employee> message) {
 Employee employee = message.getPayload();
 System.out.println("Message Received \n Name :"+employee.getName()+"/n Phone : "+employee.getPhone()+"/n Address :"+employee.getAddress());

 }
}

@MessageEndpoint will indicate that it will receive message from channel via adapter.

Not but not leas below is Employee POJO

package org.springsample.integration;
public class Employee {
 private String name;
 private String title;
 private String address;
 private String phone;

public Employee(String name, String phone, String address) {this.name=name;this.phone=phone; this.address=address;
//……..Getter amd Setter
 }
}

Testing

We can test this using spring test framework as below

package org.springbyexample.integration;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
public class SpringIntegTest {
 @Autowired
 private SentRequest request = null;
 @Test
 public void testIntegration() {
 Employee emp = new Employee("John", "12345678", "Sunny Street Mac RG1");
 request.process(emp);
 }
}

Make sure you keep spring config file name SpringIntegTest-context in org/springbyexample/integration and should be in your class path
While running SpringIntegTest, it will display console message as follows

Message Received
Name :John/n Phone : 12345678/n Address :Sunny Street Mac RG1

Summary

Spring Integration is open source simple integration that enhances loose coupling and make application integration easy and simpler. It will integrate, route and mediate the message across the channel and gateway in configurable way. This article helps to understand about Spring Integration and will aid you to develop a simple integration application.

Resources

 

Related Whitepaper:

Functional Programming in Java: Harnessing the Power of Java 8 Lambda Expressions

Get ready to program in a whole new way!

Functional Programming in Java will help you quickly get on top of the new, essential Java 8 language features and the functional style that will change and improve your code. This short, targeted book will help you make the paradigm shift from the old imperative way to a less error-prone, more elegant, and concise coding style that’s also a breeze to parallelize. You’ll explore the syntax and semantics of lambda expressions, method and constructor references, and functional interfaces. You’ll design and write applications better using the new standards in Java 8 and the JDK.

Get it Now!  

Leave a Reply


5 − three =



Java Code Geeks and all content copyright © 2010-2014, Exelixis Media Ltd | Terms of Use
All trademarks and registered trademarks appearing on Java Code Geeks are the property of their respective owners.
Java is a trademark or registered trademark of Oracle Corporation in the United States and other countries.
Java Code Geeks is not connected to Oracle Corporation and is not sponsored by Oracle Corporation.

Sign up for our Newsletter

15,153 insiders are already enjoying weekly updates and complimentary whitepapers! Join them now to gain exclusive access to the latest news in the Java world, as well as insights about Android, Scala, Groovy and other related technologies.

As an extra bonus, by joining you will get our brand new e-books, published by Java Code Geeks and their JCG partners for your reading pleasure! Enter your info and stay on top of things,

  • Fresh trends
  • Cases and examples
  • Research and insights
  • Two complimentary e-books