Enterprise JavaBeans™ Component Architecture: Designing and Coding Enterprise Applications

8.1. Messaging Architectures

Let's begin with a discussion of how one might send data between clients in an enterprise application. Consider the architecture shown in Figure 8-1. All clients are tightly coupled. This arrangement makes each client aware of other clients in a many-to-many relationship. In a Remote Procedure Call (RPC) environment (such as Java RMI), each business method represents a call which may be remote across a network. Because these calls are synchronous, the client's thread blocks and cannot proceed until the business method completes.

Figure 8-1. Synchronous Architecture

Tightly coupled RPC architectures can have problems. ...