Download Core J2EE Patterns by Deepak Alur, John Crupi, Dan Malks PDF

By Deepak Alur, John Crupi, Dan Malks

This consultant provides the easiest practices for improvement utilizing J2EE applied sciences and information 21 layout styles that produce functions awesome for his or her functionality, scalability, and robustness. A multi- tier case research illustrates each level of company improvement, and pattern code is supplied. universal error are pointed out, to allow them to be refrained from. The authors are Java architects and engineers

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Extra info for Core J2EE Patterns

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The J2EE patterns described in this book address different requirements spread across all the J2EE tiers. In our tiered approach (see “The Tiered Approach”), we have modeled the J2EE multiple tiers as five tiers: client, presentation, business, integration, and resource tiers. This model allows us to logically separate responsibilities into individual tiers. In our model, for example, we separate the EIS tier into an integration tier and a resource tier. By doing so, we make it easier to separately address the requirements of integration and resources.

Resource Guards via Standard Security Constraints Applications may be configured with a security constraint, and this declarative security may be used programmatically to control access based on user roles. Resources can be made available to certain roles of users and disallowed to others. - 49 - Moreover, as described in “Embedding Guard Within View”, portions of a view can be restricted based on these user roles as well. If there are certain resources that should be disallowed in their entirety for all direct browser requests, as in the all-or-nothing scenario described in the previous section, then those resources can be constrained to a security role that is not assigned to any users.

Another alternative is to store session state in either the business tier or the resource tier. Enterprise JavaBeans components may be used to hold session state in the business tier, and a relational database may be used in the resource tier. For more information on the business-tier option, please refer to “Using Session Beans”. Controlling Client Access There are numerous reasons to restrict or control client access to certain application resources. In this section, we examine two of these scenarios.

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