Reviews : Trader Pattern for Invoking Services :

Trader Pattern for Invoking Services

by: Samudra Gupta

Introduction

Motivation

  In this model, one of the other conclusions is that these business Service components are server based, distributed by nature and capable of serving many clients at the same point of time. However, a good application architecture will suggest that the client of these business Services also need not know how these Services are deployed and how they are implemented internally. In other words, client programs should not have to change if, for example, we need to make any changes to the internal implementation in these Service components or if we decide to deploy the Service components in a completely new deployment environment.

  Just to make things easier, let us say we have a business Service component for the bank accounts. The task of this component is merely to retrieve the bank account details. Now we may decide this component to deploy in the web container as a simple JDBC based component or we may also decide to deploy this as an Entity bean in any EJB container. The question is should this decision affect the client to this program? The answer is simple,no.

  This is where the Trader pattern comes into the picture. In summary, the Trader pattern helps us achieve the following points:

 
1. Provides a complete decoupling between the client and the way Service components are implemented and deployed.
2. Configurable selection of the type of services to be deployed and also configurable deployment information.
3. Highly scalable application architecture.

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