Пример приложения использующего JMS и MDB

JMS and MDB sample application

Enterprise messaging has become an increasingly important component of loosely coupled, reliable enterprise frameworks. This is due in large part to the proliferation of enterprise applications and disparate enterprise resources, and the increasing need to integrate these applications into cohesive systems. Over the years Messaging and Message Oriented Middleware (MOM) has provided this integration proprietary manner. Introduction of Java Messaging Service (JMS) as a standard, eliminated many of the disadvantages in proprietary MOM based products. In addition,Message Driven Beans(MDBs) introduced together with Enterprise Java Beans 2.0 have served to get the best out of existing investments in J2EE application servers. Most of the J2EE application servers in modern era are acting as a MOM with a whole lot of value added services to JMS. As a J2EE 1.4 certified application server, Apache Geronimo comes into the party with support of JMS integrating with one of the best breed open source messaging frameworks, ActiveMQ. This article will provide you with a way to use JMS for your enterprise application scenario both as a local and remotely referred environments with Geronimo and ActiveMQ.

The company referred in this sample application sells one specific item in both retail and wholesale markets under different categories. All the placed orders in the application have to be authorized by a company sales employee before delivering goods to the customer. For the wholesale market, the company has placed their agents all over the country. They send their orders as a bunch at once, which is called a consignment. End users place their orders using the company web site while agents send their consignments with a special software installed in their premises. All the consignments must be approved by the company General Manager before it is handed over to a sales employee.

This is a typical application to use JMS as a solution because both consignment and order requests are processed in asynchronous manner.