Spring事務(wù)管理用AOP實(shí)現(xiàn),這里列一下APO的基本概念,AOP是建立在OOP基礎(chǔ)上對(duì)類的行為進(jìn)行歸類后,形成的另一種理解程序結(jié)構(gòu)的方法。以下內(nèi)容摘自Spring官方文檔窃这。其中切面瞳别、連接點(diǎn)、通知杭攻、切入點(diǎn)的概念比較重要,可自己根據(jù)英文解釋理解祟敛。連接點(diǎn)是程序執(zhí)行的點(diǎn),表示一個(gè)執(zhí)行的方法,切入點(diǎn)是根據(jù)條件對(duì)連接點(diǎn)進(jìn)行的篩選匹配,為保證原汁原味,下面附上原文

AOP concepts

Aspect: a modularization of a concern that cuts across multiple classes. Transaction management isa good example of a crosscutting concern in enterprise Java applications. In Spring AOP, aspectsare implemented using regular classes (the schema-based approach) or regular classes annotated with the @Aspect annotation (the @AspectJ style).

Join point: a point during the execution of a program, such as the execution of a method or the handling of an exception. In Spring AOP, a join point always represents a method execution.

?Advice: action taken by an aspect at a particular join point. Different types of advice include "around," "before" and "after" advice. (Advice types are discussed below.) Many AOP frameworks, including Spring, model an advice as an interceptor, maintaining a chain of interceptors around the join point.

? Pointcut: a predicate that matches join points. Advice is associated with a pointcut expression and runs at any join point matched by the pointcut (for example, the execution of a method with a certain name). The concept of join points as matched by pointcut expressions is central to AOP, and Spring uses the AspectJ pointcut expression language by default.

? Introduction: declaring additional methods or fields on behalf of a type. Spring AOP allows you to introduce new interfaces (and a corresponding implementation) to any advised object. For example,you could use an introduction to make a bean implement an IsModified interface, to simplify caching. (An introduction is known as an inter-type declaration in the AspectJ community.)

? Target object: object being advised by one or more aspects. Also referred to as the advised object.Since Spring AOP is implemented using runtime proxies, this object will always be a proxied object.

? AOP proxy: an object created by the AOP framework in order to implement the aspect contracts(advise method executions and so on). In the Spring Framework, an AOP proxy will be a JDK dynamic proxy or a CGLIB proxy.

? Weaving: linking aspects with other application types or objects to create an advised object. This can be done at compile time (using the AspectJ compiler, for example), load time, or at runtime. Spring AOP, like other pure Java AOP frameworks, performs weaving at runtime.

Types of advice:

? Before advice: Advice that executes before a join point, but which does not have the ability to prevent execution flow proceeding to the join point (unless it throws an exception).

? After returning advice: Advice to be executed after a join point completes normally: for example, if a method returns without throwing an exception.

? After throwing advice: Advice to be executed if a method exits by throwing an exception.

? After (finally) advice: Advice to be executed regardless of the means by which a join point exits (normal or exceptional return).

? Around advice: Advice that surrounds a join point such as a method invocation. This is the most powerful kind of advice. Around advice can perform custom behavior before and after the method invocation. It is also responsible for choosing whether to proceed to the join point or to shortcut the advised method execution by returning its own return value or throwing an exception.

通知類型主要是根據(jù)連接點(diǎn)的執(zhí)行和異常拋出情況執(zhí)行通知,?Before advice?在連接點(diǎn)執(zhí)行之前執(zhí)行,After returning advice 在連接點(diǎn)正常返回后執(zhí),After throwing advice則是在異常拋出后執(zhí)行,After (finally) advice 是連接點(diǎn)執(zhí)行后無論異常與否都會(huì)執(zhí)行,Around advice是在連接點(diǎn)執(zhí)行前和執(zhí)行后都會(huì)執(zhí)行,Spring 建議根據(jù)需求選擇合適的最簡(jiǎn)單的通知類型。