WSO2 ESB Rule Mediator Example


This post is to demonstrate how to write Rule mediator in WSO2 ESB.
This example is tested in WSO2 ESB 4.7.0
The example, get the list of students with marks for their subjects and, inside the proxy it check whether the each student has passed the each subject and print the result. To define type of the input data POJO adapters are used in this example.

1.Write the following POJO classes.

Student class

package com.example.rulemediator;

public class Student {

	private String indexNumber;
	private String name;
	private Subject[] subjects;

	public String getIndexNumber() {
		return indexNumber;
	}
	public void setIndexNumber(String indexNumber) {
		this.indexNumber = indexNumber;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Subject[] getSubjects() {
		return subjects;
	}
	public void setSubjects(Subject[] subjects) {
		this.subjects = subjects;
	}
}

Subject class

package com.example.rulemediator;

public class Subject {

	private String subjectCode;
	private String subjectName;
	private int score;

	public String getSubjectCode() {
		return subjectCode;
	}
	public void setSubjectCode(String subjectCode) {
		this.subjectCode = subjectCode;
	}
	public String getSubjectName() {
		return subjectName;
	}
	public void setSubjectName(String subjectName) {
		this.subjectName = subjectName;
	}
	public int getScore() {
		return score;
	}
	public void setScore(int score) {
		this.score = score;
	}
}

2. Then create a Jar file containing above classes and copy it to ESB_HOME/repository/components/lib folder and start the ESB.

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WSO2 ESB Scheduled Task Example


This post is to demonstrate how to write a Scheduled task and using it inside the WSO2 ESB.

This example is test in WSO2 ESB 4.7.0

1. Write a Class and extend the Task interface. And override the execute method with the task you need to do.

package com.example.post.scheduledTask1;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.synapse.startup.Task;

public class ESBTask implements Task{
   private String parameter;

   public void execute() {
      SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd-HH.mm.ss.SSS");
      Date date = new Date();
      String time = sdf.format(date);
      System.out.println(time+" - Scheduled Task Running....");
      System.out.println("parameter: "+parameter);
   }

   public void setParameter(String parameter) {
      this.parameter = parameter;
   }

}

The setter method for the parameter variable let us to set a value to it, in the ESB Console.

2. Build a jar and copy it to the WSO2ESB_HOME/repository/components/lib folder and restart (if already started) the WSO2ESB server.

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WSO2 ESB Spring Mediator Example


This post is to demonstrate how to initialize and use a SpringBean as a mediator.

We are going to print the HELLO ‘Argument’ in this example. And this ‘argument’ is passed using the spring configuration file. This example is tested in WSO2ESB 4.6.0

1. Build the jar file of the following class and place it in ESB_HOME/repository/components/lib folder.

package com.test.spring.mediators.springmediator;

import org.apache.synapse.MessageContext;
import org.apache.synapse.mediators.AbstractMediator;

public class HelloWorld extends AbstractMediator{
   private String message;

   public void setMessage(String message){
      this.message = message;
   }

   public boolean mediate(MessageContext arg0) {
      System.out.println("HELLO "+message);
      return true;
   }
}

2. Start the WSO2ESB and add the following spring configuration file (springConfig.xml) under /_system/config/repository/springConfig.xml in the ESB Registry.

spring configuration file (springConfig.xml)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
   <bean id="springtest" class="com.test.spring.mediator.springmediator.HelloWorld" singleton="false">
      <property name="message"><value>ISURU</value></property>
   </bean>
</beans>

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