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When the behavior of your application requires a great deal of branching dependent on business requirements, you are essentially coding business rules into your system. For example, the very first condition we encounter states in essence is Unidentified users should see the default portlet. Taking the remaining rules in our example, we end up with a set of quite simple statements about how the application should behave: Administrators should see the administrator tools. Key account managers should see the KAM tools. Support staff should see the support tools. Helpdesk staff should see the helpdesk tools. Customers should see customer tools. KAM tools include customer tools. Support tools include customer tools. Helpdesk tools include customer tools. This breakdown of the rules is obviously quite programmatic in nature, but it s also close to the way that nontechnical people might think and speak about the business requirements for the portlet that a key account manager should have access to the customer tools (perhaps to place bids on behalf of a client), but that the administrator who is concerned with determining who is on the helpdesk and who is an account manager and so forth should not. This technique of rules-based programming is well established, and free tools are available that can help you to accomplish this. The resulting system takes on the form shown in Figure 11-2.

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Summary

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<a href="http://www.yoursite.com/ q=forum" title="Discussion forums"> Forums</a> <a href="http://www.yoursite.com/ q=tracker" title="The most recent posts">Recent posts</a> <a href="http://www.yahoo.com" title="A portal to everything"> Yahoo!</a>

Figure 11-2. Bringing rules into the display logic The information available to the system, such as the user attributes, the user s role memberships, and other information not shown such as the window state, is combined with the business rules to generate the output. Most of the solutions available for applying rules-based techniques allow you to create your own business semantics for describing business rules. The following XML fragment shows the sort of approach that might be applied to our example problem:

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The Spring transaction-management framework solves a problem developers have been struggling with for years: how to transparently blend transaction management with data-access code. Spring integrates with at least eight transaction-management APIs in Java as well as the JTA. It abstracts the differences between them without losing any of their features. Spring also offers six ways of configuring transaction demarcation. You end up with at least 54 possible combinations for the transaction-management API and transaction demarcation. All the options are available without needing to change your application logic. Transaction management with Spring is a matter of configuration, flexibility, and choice. When it comes to data access and transaction management, no alternative to Spring offers the same amount of choice and flexibility. In the next chapter, we move from the data layer into the presentation layer and look at Spring MVC.

<display> <tools> <role>Administrator</role> <output>Administrator</output> </tools> <tools> <role>KeyAccountManager</role> <output>KeyAccountManager,Customer</output> </tools> <tools> <role>Support</role> <output>Support,Customer</output>

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</tools> <tools> <role>Helpdesk</role> <output>Helpdesk,Customer</output> </tools> <tools> <role>Customer</role> <output>Customer</output> </tools> <tools> <role>user</role> <output>general</output> </tools> </display>

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elcome to 8, where you will apply what you ve learned about the Spring Framework to building high-quality web applications with the Spring MVC web application framework. This chapter, as an introduction and tour of Spring MVC, certainly does not stand on its own. Before diving into this chapter, we recommend that you have a good understanding of the following: The ApplicationContext and its configuration files Dependency injection Data access, such as JdbcTemplate Transaction management Spring AOP

If a manager decides that the helpdesk should only deal with the simplest queries and have no access to customers details, it s a simple matter to change the appropriate entry:

Post information includes the username and date of publication for any given node. By checking the various node types listed, you decide whether this information is displayed. You would probably opt to show post information on a site where many users are submitting content. You would likely want to hide the post information on a homepage or corporate site where there is either a single author or all the information is speaking for a single entity. This can be configured only at the global level, not for individual themes.

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