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convinces your colleagues of the benefits that AspectJ offers, very well. Otherwise, continue using the aspects in your own development world and simply exclude them in the shipment builds. The plug-and-play nature of policyenforcement aspects provides you an opportunity to play with AspectJ without requiring a full commitment. Start with the aspects presented in this chapter. The next time you encounter a novel programming wisdom or best practice, consider writing an enforcement aspect encapsulating the knowledge. Over time, you will have a repository of policy-enforcement aspects that will help you in all your projects. When you start using a new framework, you can create policy-enforcement aspects specifically targeted to the framework. If you are in a mentoring role, you can provide your aspects to your team. You will then no longer have to sit down and repeat the policies with each team member. AspectJ offers a simple and yet powerful way of implementing system wide policy-enforcement concerns. The policy-enforcement aspects you develop are reusable, lowering your per-project development cost. These aspects use the AspectJ compiler to enforce as many policies as possible at compile time and use dynamic crosscutting to understand the runtime violations in more detail. With such aspects in place, you are assured of better-quality code and you can spend your time on more exciting issues. Note, though, that the mechanisms presented here do not substitute for code reviews. However, with policy enforcement in place, the code reviews can focus on the subtler nuances of the implementations. Once you start enforcing policies in a significant way by using AspectJ, you will find AspectJ to be your best friend; it always watches you, reminds you of common pitfalls, and lets you spend time on the more creative aspects of life (yes, pun intended).

Tip A project is a relational database term describing the query operation that limits the result set to those columns defined in the column list on a SQL command. For example, the SQL command SELECT fname, lname FROM employee would project only the fname and lname columns from the employee table to the result set.

Resource pooling the recycling of resources that are expensive to create and discard is one of the most common techniques for improving system performance. Without resource pooling, systems spend a good amount of time creating and destroying resources. The conventional methods of resource pooling require that you explicitly code the pooling logic within each module that deals with the creation and destruction of resources. Since many modules may be performing those tasks, this approach can be cumbersome. Further, a resource pooling feature may need tuning at various times during its evolution, and if it is a part of a reusable subsystem, tuning may be needed in each system in which it is implemented because usage patterns will differ. The conventional solution requires modifications to all affected modules in such cases, making it a crosscutting concern. AOP can help modularize this crosscutting concern by encapsulating the pooling logic in an aspect. This chapter examines aspect-oriented resource pooling techniques. First we will create a template to demonstrate a plug-and-play style of resource pooling, and then we will add examples that implement database connection and thread pooling based on that template. Using the generic template, you should be able to extend the idea to other kinds of resources, such as JMS or TCP/IP connection objects. Since caching is closely related to resource pooling, we will also introduce AspectJ-based caching by using an example of caching XSLT stylesheet transformer objects.

It is at this point that the query optimizer is invoked to optimize the execution of the query via the join->prepare() and join->optimize() functions. Query execution occurs next, with control passing to the lower-level do_select() function that carries out the restrict and projection operations. Finally, the sub_select() function invokes the storage engine to read the tuples, process them, and return results to the client. These methods are located in /sql/sql_select.cc. After the results are written to the network, control returns to the hand_connections_sockets loop (located in /sql/mysqld.cc).

Type a different Partner name in the referenced cell, and the formula will show the results for the new name. It s much quicker and easier than adjusting a small part of the formula.