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With an N-tier architecture, connections to external resources can be managed very efficiently. 9 Security reasons often necessitate three-tier divisions. Ser ver-side Component Architectures 21 besides using resources, such as rendering a graphical user interface. Rather than your business components acquiring and releasing connections to resources (such as databases), the resources can be pooled and re-used for different client requests. The resulting set of database connections required is often far less than the total number of components in a deployed system.

But unfortunately, Ser ver-side Component Architectures 25 developers who integrate to Microsoft’s N-tier vision must tie themselves to a particular vendor (Microsoft), which allows only the Microsoft platform as a deployment scenario. This makes it difficult if not impossible to perform deployments on mainframes or high-end UNIX machines, which have a significant amount of services available for high-reliability deployments, as well as much higher processor and resource scalability. 0). This means a Windows-based deployment has a very high machine maintenance cost due to the sheer number of machines required.

Component Architectures in Java Now that you’ve seen what a component architecture is, let’s look at what component architectures exist in the Java world. The first one you may have heard of is JavaBeans. JavaBeans components are small-grained application bits. You can use JavaBeans to assemble larger-grained components or to build entire applications. JavaBeans, however, are development components and are not deployable components. You typically do not deploy a JavaBean because a JavaBean is not a complete application; rather, JavaBeans help you construct larger software that is deployable.

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