join point

At the heart of each of the AOP tools is a join point model, which provides a means of identifying where the crosscutting is happening.

The Highlighter aspect captures the return value of a join point and replaces it with a highlighted version of the same.

If I declared that the advice returns Object, I could use the advice at any join point.

With AOP, we need to look from the outside in, and determine the effects of each aspect on every possible join point.

Method at a join point in an around advice, AspectJ handles this situation for me without requiring any special effort.

Matches the initialization join point of any object with the.

To seek the best join point of teaching and learning, teachers must integrate the course content and the factual competence of students.

Spring AOP takes a different approach and purposely limits the expressiveness of its join point model.

Next, I'll quickly review the basics of AOP's join point model and explain where it would benefit from metadata fortification.

A join point is an identifiable point in the execution of a system.

The content assist pop-up shows all the join point context available within the advice body.

Join point is an abstract notion; one does not actively define a join point.

In AspectJ, lots of advice can run at a join point without knowing anything about other advice at the join point.

A join point is a point in the execution of a program where you can usefully join behavior.

When this is the case, this technique of tracking state from one join point to be used in a later one is quite helpful.

Another run-time performance benefit results from static typing of join point parameters in AspectJ and AspectWerkz.

Similarly, around advice can declare a return value ( "void" above), which requires any join point have the same return value.

A join point indicates a point in the source code of the target class where you want to inject the aspect's code.

Keep in mind that Annotations should describe what is true at the join point (condition) - not what should happen at those points (action).

In these cases you can query the object representing the advised join point for its associated annotations.

Provides a join point for multiple input messages that enables message aggregation.

Matches any join point where the arguments have the given annotation.

Advice is executable code that runs when the join point is encountered during the program runs.

Is a language-specific construct that denotes or captures a particular join point.

Both the annotation and the newly created instance are captured as context at the join point.

Matches any join point within a type that has a given annotation.

A join point is a well-defined point in the code at which our concerns crosscut the application.

The net effect of Listing 7 is to record a count whenever I exit a monitored join point by throwing an exception.

A join point is where the main program and the aspects meet.

In this section, I'll review the AOP join point model and the language mechanisms that leverage it.

AOP offers another way to specify an abstraction: as a pointcut specifying a join point.

Precondition tests are handled by before advice, which is executed just before the corresponding method execution join point.

The second statement identifies the exact join point where the advice is executed and makes use of the AspectJ JoinPoint class.

This yields a performance boost since join point context doesn't need to be accessed reflectively.

In our example, we choose to perform the logging immediately after the updating method in the join point returns.

They execute before the join point, after the join point, and instead of the join point, respectively.

Advice is code that executes before, after, or around a join point.

This gives the benefit of static typing for join point context.

A join point is a precise point of execution in a program, such as a method found in a class.

Two pieces of advice at a join point are not visible to each other, and they only bind the join point context variables they declare.

There are two ways to approach configuring tests at a join point.

To proceed with the original join point.

The main concept is the join point.

Needs to access information based on the monitored join point.

This advice would only run if some context were IConfigurable, but when it runs, it can run the underlying join point many times.

Base code is refactored to create a better join point model.

It is as general as a join point, safer than advice (because the context is more hidden), and as reusable as Command.

Another problem is that the crosscutting views only show matches based on static join point shadows.

Simple join point model is well suited to coarse-grained aspects and easier to learn.

Matches any join point where the object currently bound to