May 2009
Intermediate to advanced
330 pages
10h 34m
English
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RPC Versus Asynchronous Messaging
RPC (Remote Procedure Call) is a term commonly used to describe a distributed computing model that is used today by both the Java and .NET platforms. Component-based architectures such as Enterprise JavaBeans are built on top of this model. RPC-based technologies have been, and will continue to be, a viable solution for many applications. However, the enterprise messaging model is superior in certain types of distributed applications. In this section we will discuss the pros and cons of each model.
Tightly Coupled RPC
One of the most successful areas of the tightly coupled RPC model has been in building 3-tier, or n -tier, applications. In this model, a presentation layer (first tier) communicates using RPC with business logic on the middle tier (second tier), which accesses data housed on the backend (third tier). Sun Microsystems’ J2EE platform and Microsoft’s .NET platform are the most modern examples of this architecture.
With J2EE, JSP and servlets represent the presentation tier while Enterprise JavaBeans (EJB) is the middle tier. Regardless of the platform, the core technology used in these systems is RPC-based middleware with RPC being the defining communication paradigm.
RPC attempts to mimic the behavior of a system that runs in one process. When a remote procedure is invoked, the caller is blocked until the procedure completes and returns control to the caller. This synchronized model allows the developer to view the system as if it runs ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.