Component Development for the Java Platform by Stuart Dabbs Halloway

By Stuart Dabbs Halloway

If you are fascinated with writing elements in Java, this ebook makes a speciality of the part companies you want to grasp. DevelopMentor leader Scientist Stuart Halloway offers extraordinary, in-depth assurance of writing, deploying, and conserving Java parts. Halloway starts off through exhibiting the best way to use, keep an eye on, and troubleshoot parts. He bargains real-world assistance in retrospect functionality, and demonstrates how mirrored image is used to construct the Java serialization structure. He additionally bargains special insurance of utilizing the Java local Interface (JNI) to regulate the limits among Java code and elements written in different environments. partly II, Halloway provides a pragmatic imaginative and prescient for utilizing part providers to turn into a better Java developer. via examples and pattern code, he introduces generative programming thoughts that leverage Java into excessive functionality. ultimately, construction on those strategies, he indicates the best way to build powerful interoperability among Java and Win32/COM.

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2 Goals of the Class Loader Architecture “Design before you code” is a good rule, even when you are merely studying a system already in place. fm Page 15 Friday, November 9, 2001 3:43 PM to understand the goals of the architecture. This section serves to justify, in advance, some of the complexity you will see in the class loader code. The class loader architecture aims to be transparent, extensible, capable, and configurable. Also, it needs to deal sensibly with name conflicts and version incompatibilities without compromising the ability to share resources loaded from different places or in different ways.

In other words, the implementation’s class loader must delegate to the client’s class loader. This is implicit in the Point example because the PointClient is loaded by the system class loader, which is the default parent for new class loaders. The remaining issues deal with the relationship between old and new versions of a class. The VM recognizes no relationship between old and new versions of a class, so you must manufacture any necessary relationship in your code. In the example, the PointServer class manages the relationship between old and new versions of PointImpl.

In practice, the naming rule will fail in two ways: 1. Organizations have internal name collisions. Without a very strict top-down policy, this is more difficult to avoid than it might at first seem. S. FootballPlayer, for example. Worse still, some organizations might place code in the default package. 2. Organizations need to deploy multiple versions of the same class simultaneously. Consider a mission critical server that needs 24/7 availability. When a new version of a class becomes available, that class should be used to service new clients.

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