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Weaver
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Figure 11.1 Aspect oriented programming (AOP) is built to handle the types of crosscutting concerns that are important to enterprise developers, like persistence, exceptions, distribution and transactions.
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transition path from EJB is not clear. Let s consider the ways in which the specification team might make a transition:
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They could choose to move aggressively in the direction of AOP, scrapping the cumbersome container in favor of a library of aspects addressing enterprise concerns, and providing a framework that enables tools or users to support the aspectual recomposition. You would see extreme changes in the Java language that supports this new paradigm. The specification team could take a more conservative approach, enabling AOP but not forcing that development paradigm. This type of strategy could move container services away from the container and allow services to be organized and consumed as aspects. You would also likely see method interceptors that provide convenient attachment points for AOP crosscutting concerns. Once underway, the correct AOP development environments could evolve independently.
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One still cloudy supposition is becoming clearer: The EJB container may be an idea whose time has passed. We may have reached a time to shift away from the component-oriented approach toward a model that lets the programmer choose the services that she needs to get the job done and consume those services more efficiently. Without such an approach, EJB will be saddled with deployment complexity, little flexibility after deployment, and less than optimal performance.
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11.2.2 Fix persistence
Many developers who say that they do not like EJB mean that they do not like entity beans. The EJB persistence story started off with a utopian distributed domain model idea. You could put domain object A on one machine, domain object B on another, and they would interoperate with complete location transparency. After they realized that this approach wouldn t fly (because of something called a network), the developers complicated their domain model with an endless chain of quick patches and compromises, trying desperately to make it work. The problem is that all the original limitations and none of the benefits remain. We need to start over. It seems that entity beans completely monopolize the EJB spec. Why waste all that time implementing a fundamentally flawed technology The answer is political vendors have invested too much only to see entity beans fail. However, as an industry, we need to recognize that EJB persistence is broken. We also need to demand a fix and use alternatives until we get one. When we heard the outcry over the PetStore performance benchmark (see chapter 1), we noticed that little of the discussion centered on EJB persistence. As
A bittersweet future
currently defined, entity beans lead to uncertainty, demand frequent and painful workarounds, and often result in poor performance. A reworked persistence framework should embrace the following ideas:
A better persistence strategy needs to start with a finer grained service. Coarse-grained services can and should be attached elsewhere. A revised framework needs to focus solely on providing persistence to Java objects with all their complexity. Inheritance and abstract interfaces are critical. A revised framework needs to be more transparent. A revised framework cannot impose arbitrary restrictions. Currently, the specification asks users to avoid a warped version of re-entrance. That demand makes modeling much more difficult.
Realistically, the EJB specification team could start with a cleaner persistence framework like JDO. Doing so would put them much closer to an ultimate working solution. Better yet, the team should learn from the mistakes of the past and start from scratch with a cleaner, simpler notion of persistence.
11.2.3 Fix the deployment strategy
Metadata is information about a given class, interface, object, or component. Deployment descriptors are essentially a way to provide metadata about a class at deploy time. The deployment descriptor approach had its benefits but, like the component-driven architecture, it is showing its age. The complexity of deployment descriptors grows with every release and won t be likely to get any easier. To shift to another strategy, EJB will have to provide a richer metadata capability. Ideally, the metadata capability should be built into the base Java programming language. Such a proposal has already been suggested in the form of Java Specification Request (JSR) 175. By adopting this request, the EJB specification team could move toward a richer, simpler strategy for dealing with metainformation, without the need for complex deployment descriptors. JSR 175 may be adopted soon in a future Java release. This move would go a long way toward improving EJB tools and simplifying the platform, in general.
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