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| Business Delegate Design Pattern - Implementation - Class Diagram |
BusinessService.java
public interface BusinessService
{
public void doProcessing();
}
EJBService.java
public class EJBService implements BusinessService
{
@Override
public void doProcessing()
{
System.out.println("Processing task by invoking EJB Service");
}
}
JMSService.java
public class JMSService implements BusinessService
{
@Override
public void doProcessing()
{
System.out.println("Processing task by invoking JMS Service");
}
}
BusinessLookUp.java
public class BusinessLookUp
{
public BusinessService getBusinessService( String serviceType )
{
if( serviceType.equalsIgnoreCase("EJB") )
{
return new EJBService();
}
else if( serviceType.equalsIgnoreCase("JMS") )
{
return new JMSService();
}
return null;
}
}
BusinessDelegate.java
public class BusinessDelegate
{
private BusinessLookUp lookupService = new BusinessLookUp();
private BusinessService businessService;
public void doTask( String serviceType )
{
businessService = lookupService.getBusinessService(serviceType);
System.out.println(businessService.toString() + " : Got business service object after do the look up");
businessService.doProcessing();
}
}
Client.java
public class Client
{
public static void main( String[] args )
{
BusinessDelegate businessDelegate = new BusinessDelegate();
System.out.println("Invoke the business delegate by passing service type as EJB");
businessDelegate.doTask("EJB");
System.out.println("");
System.out.println("Invoke the business delegate by passing service type as JMS");
businessDelegate.doTask("JMS");
}
}
Output
Invoke the Service Locator by passing service type as EJB
EJBService@42719c : Got business service object after do the look up
Processing task by invoking EJB Service
Invoke the Service Locator by passing service type as JMS
JMSService@119298d : Got business serve object after do the look up
Processing task by invoking JMS Service
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Thank you for this clear and concise explanation of the Business Delegate design pattern! Your breakdown of its structure and benefits, especially in decoupling presentation-tier clients from business services, makes the concept easy to grasp. It’s a helpful reminder of how essential design patterns are for creating scalable and maintainable applications. Do you have any examples or scenarios where implementing the Business Delegate pattern significantly improved a project’s architecture? Thanks again for sharing your expertise
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