aspectj

《Spring5学习》04

好久不见. 提交于 2019-11-29 19:17:13
一、Spring面向切面编程的基本概念 面向切面编程(即AOP):把项目中需要再多处使用的功能比如日志、安全和事务等集中到一个类中处理,而不用在每个需要用到该功能的地方显式调用。 横切关注点:在软件开发过程中分散于应用中多处的功能 切面:切点和通知的结合,通知和切点共同定义了切面的全部内容:是什么以及在何时和何处完成其功能 通知:切面要完成的工作。除了描述切面要完成的工作,还解决了何时完成何时执行这个工作的问题。Spring的通知有5种类型:before、after、after-returnning、after-throwing和around这五种类型 连接点:连接点表示在何种操作发生时应用切面。比如方法调用时、修改字段时以及抛出异常时; 切点:一般使用明确的类和方法名称或是利用正则表达式匹配的类和方法名称来指定在何处应用切面,一般应用切面的点就被称为切点,一般使用切点来指定连接点。 引入:我们可以创建一个通知类创建新的属性和方法,就可以在不修改切点类的前提下让他们具有新的行为功能 织入:织入是指把切面应用到目标对象并创建新的代理对象的过程。切面在指定的连接点被织入到目标对象,在目标对象的生命周期里有多个点可以进行织入: 编译期:切面在目标类编译时被织入(例如AspectJ的织入编译器织入切面) 类加载期:切面在目标类加载到JVM时被织入(例如AspectJ5的加载时织入) 运行期

详解:动态代理中的不同实现方式

久未见 提交于 2019-11-29 19:11:44
动态代理的实现 1.JDK动态代理 jdk动态代理实现步骤: 前提:jdk动态代理有限制条件,要代理的目标对象必须要 实现接口 实现:使用反射API实现,具体实现原理这里不做详细讲解,这里只讲解动态代理的实现。 以下为代码列表,所有涉及到的类有三个 Calculator.java 【目标对象实现的接口】 CalculatorImpl.java 【目标对象】 Main.java 【程序入口类】 //目标对象实现的接口 public interface Calculator { int add(int a, int b); } //目标对象 public class CalculatorImpl implements Calculator { @Override public int add(int a, int b) { return a + b; } } ​ //程序入口 import java.lang.reflect.Proxy; ​ public class Main { public static void main(String[] args) { //创建目标对象 Calculator calculator = new CalculatorImpl(); //创建代理对象 Calculator o = (Calculator) Proxy

AspectJ LTW in eclipse - Pointcut does not work with static method

随声附和 提交于 2019-11-29 18:29:07
I have an Aspect class, which defines one point-cut expression as below @Pointcut("execution(* com.vg.pw.tasks.shared.*.executeTasks(..))") public void myTraceCall() {} where the executeTasks() method is static. If the method is made to non-static, the method body is executed on every call of executeTasks() . Why is my pointcut not effective on static methods? I'm using LTW and not spring. I just tried out your pointcut expression and it works on both static and non-static methods just as it should. I used AspectJ weaver 1.8.7. Try adding -showWeaveInfo and -verbose to your aop.xml for debug

aspectj-maven-plugin, declare soft how to compile

自古美人都是妖i 提交于 2019-11-29 16:49:26
Is it possible to compile project with softened Exceptions (e.g.: declare soft: Exception : execution(* *.*()); ) aspects in it using only aspectj-maven-plugin ? I can't handle it... I am still getting compilation error unreported exception Exception; must be caught or declared to be thrown So it is compiled without taking aspects in account. I am using this command to compile: mvn clean aspectj:compile and my pom.xml is: <project> <modelVersion>4.0.0</modelVersion> <groupId>pl.group.id</groupId> <artifactId>aop</artifactId> <version>1.0.0</version> <dependencies> <dependency> <groupId>org

Origin of some of AOP's terminology

懵懂的女人 提交于 2019-11-29 15:57:42
I would think this question have been asked before, but I was not immediately able to find related SO questions, or articles elsewhere for that matter. It strikes me that certain terms in AOP are rather strange. It seems I'm not the only one - this article , for instance, notes that "unfortunately, AOP terminology is not particularly intuitive". However, I have not found a resource explaining why they are not more "intuitive", if that's possible. More specifically: I can somewhat understand "aspect" and "join points" - they seem descriptive enough. But "pointcuts" and "advice" seem somewhat

What is the AspectJ declarative syntax for overwritting an argument

最后都变了- 提交于 2019-11-29 15:47:52
问题 This has been answered before with annotation syntax: Aspectj overwrite an argument of a method But I can't figure out how to do it with the AspectJ declarative syntax. The following should add "Poop" in front of each string in the method but it does not. public aspect UserInputSanitizerAdvisor { pointcut unSafeString() : execution(@RequestMapping * * (..)); Object around() : unSafeString() { //thisJoinPoint.getArgs(); //proceed(); System.out.println("I'm Around"); Object[] args =

AspectJ: parameter in a pointcut

爷,独闯天下 提交于 2019-11-29 15:12:07
问题 I'm using AspectJ to advice all the public methods which do have an argument of a chosen class. I tried the following: pointcut permissionCheckMethods(Session sess) : (execution(public * *(.., Session)) && args(*, sess)); This is working wonderfully for methods with at least 2 arguments: public void delete(Object item, Session currentSession); but it does not work with methods like: public List listAll(Session currentSession); How may I change my pointcut to advice both methods executions? In

AspectJ AOP LTW not working with dynamic loading of javaagent

心不动则不痛 提交于 2019-11-29 15:09:20
Here is my sample non-working project . It contains 2 modules: aop-lib - Aspects used as lib. It contains the following classes Wrap.java - It's the annotation used to attach advice WrapDef.java - It is the definition of the above mentioned Wrap annotation. aop-app - Uses the above aspect lib DynamicLoad.java - class to load javaagent dynamically Main.java - Main class which uses Wrap annotation. Dir structure is as follows: . ├── README.md ├── aop-app │ ├── pom.xml │ └── src │ └── main │ └── java │ └── com │ └── aop │ └── app │ ├── DynamicLoad.java │ └── Main.java └── aop-lib ├── pom.xml └──

Android Studio and MonkeyTalk?

試著忘記壹切 提交于 2019-11-29 14:52:14
问题 Has anybody successfully set up MonkeyTalk with Android Studio? My main problem at this point is I don't see a way to set the java compiler to aspectj I believe there's some way to do this in custom_rules.xml, but I haven't seen how to do this yet. This leads to a maybe unrelated problem, but in the newest version of Android Studio that I'm using (0.1.1), I don't see a way to run an ant build from inside Android Studio. Any suggestions appreciated! 回答1: An approach that I have found works

Spring学习之Aspectj开发实现AOP

落花浮王杯 提交于 2019-11-29 13:30:19
Aspectj是一个基于Java语言的Aop框架,它提供了强大的Aop功能。 Aspectj简介:   1.Aspectj是一个面向切面的框架,它扩展了Java语言,它定义了一个Aop语法。   2.所以它有一个专门的编译器来生成遵循Java语言的Class文件。   3.Aspectj是一个基于Java语言的 Aop框架。    4.在spring2.0之后,加入了对Aspectj切入点表达式的支持。   5.@Aspectj是在jdk1.5之后新增加的注解功能,允许在Bean中直接定义一个切面类   6.新版本的spring框架,建议使用Aspectj方式来开发Aop.   7.使用Aspectj需要导入相关的包: 因为Aspectj不是spring的一部分,是和spring一起使用进行Aop操作,spring2.0之后才增加了Aspectj支持。 使用Aspectj来执行aop操作的两种方法:   1.使用xml配置文件来使用Aop操作   2.使用注解来实现Aop操作。 使用Xml配置文件来实现Aop操作的步骤:   1.准备基本的Aop包:(1)基本的spring包;(2)第三方依赖包;(3)有关Aspectj的包;   2.创建spring的核心配置文件,导入Aop的约束:     (1)配置目标类和切面类的bean;     (2)使用<aop:config><