<spring Combat >4: Spring for facets

1 What is tangent-oriented programming

1.1 Defining AOP Terminology

Notification (Advice): The work of a slice is called a notification that defines what the facets are and when to use them (before, after, After-returning, After-throwing, Around).

Connection point (Joinpoint): is a point at which a slice can be inserted during application execution, which can be used to insert into the normal process of the application and add new behavior.

Pointcut (Pointcut): the definition of a tangent point matches one or more connection points that the notification is to be woven into.

Facets (Aspect): Facets are a combination of notifications and pointcuts.

Introduction (Introduction): ingestion allows adding a new method or property to an existing class.

Weaving (Weaving): Weaving is the process of applying facets to a target object to create a new proxy object.

1.2 Spring's support for AOP

Spring notifications are written in Java; Spring notifies the object at run time; Spring only supports method connection points.

2 Selecting a connection point using tangent points

AspectJ pointcut indicators supported by Spring AOP:

• Arg ()
• @args ()
• Execution ()
• This ()
• Target ()
• @target ()
• Within ()
• @within ()
• @annotation

Trigger notification when instrument's play () method executes:

Execution (* Com.hundsun.idol.Instrument.play (..))

Configure Pointcuts to match only specific packages:

Execution (* com.hundsun.idol.Instrument.play (..)) && within (com.hundsun.idol.*)

Beans () can specify that only specific beans are matched:

Execution (* com.hundsun.idol.Instrument.play (..)) and Bean (Kenny)

3 declaring slices in XML

<spring Combat >4: Spring for facets