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README
Apache-2.0

Nepxion Matrix

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Nepxion Matrix是一款集成Spring AutoProxy,Spring Registrar和Spring Import Selector三种机制的AOP框架,具有很高的通用性、健壮性、灵活性和易用性

简介

Spring AutoProxy机制

它统一封装接口(Spring)代理和类代理(CGLIB),注解无论在接口和类的头部或者方法上,都可以让业务端执行有效切面,可以轻松快速实现对接口或者类的复杂代理业务。代码参考com.nepxion.matrix.proxy,示例参考matrix-spring-boot-proxy-example

  • 实现接口走Spring代理,类走CGLIB代理

  • 实现通用代理和额外代理两种机制

  • 实现同一进程中,可以接口代理和类代理同存

  • 实现对类或者接口名上注解Annotation,方法上注解Annotation的快速扫描,并开放处理接口供业务端实现

  • 实现“只扫描不代理”,“既扫描又代理”;代理模式ProxyMode,支持“只代理类或者接口名上注解”、“只代理方法上的注解”、“全部代理”三种模式;扫描模式ScanMode,支持“只扫描类或者接口名上注解”、“只扫描方法上的注解”、“全部扫描”三种模式

  • 实现“代理和扫描多个注解“

  • 实现“支持多个切面实现类Interceptor做调用拦截”

  • 实现“自身调用自身的注解方法,达到切面效果”,提供自动装配(Spring 4.3.X以上的版本支持)和AopContext.currentProxy()两种方式

  • 实现“只扫描指定目录”和“扫描全局目录”两种方式

  • 实现根据Java8的特性来获取注解对应方法上的变量名(不是变量类型),支持标准反射和字节码CGLIG(ASM library)来获取,前者适用于接口代理,后者适用于类代理

    标准反射的方式,需要在IDE和Maven里设置"-parameters"的Compiler Argument。参考如下:

Spring Registrar机制

实现象@FeignClient注解那样,只有接口没有实现类,就能实现注入和动态代理。代码参考com.nepxion.matrix.registrar,示例参考matrix-spring-boot-registrar-example

  • 如果本地只有接口并加相关的注解,那么执行对应的切面调用方式
  • 如果本地有接口(不管是否加注解),并也有实现类,那么执行对应的实现类的逻辑

Spring Import Selector机制

实现象@EnableCircuitBreaker注解那样,入口加上@EnableMyAnnotation,自动初始化对应的Configuration。代码参考com.nepxion.matrix.selector,示例参考matrix-spring-boot-selector-example

  • 入口加上@EnableXXX,并提供在spring.factories定义@EnableXXX和Configuration类的关联,达到通过注解的配置与否,控制对应相关上下文对象,例如Bean类的初始化与否
  • 提供在application.properties配置参数,达到上述的目的

场景

Matrix框架一般可以应用到如下场景中:

Spring AutoProxy机制

  • 对于有复杂AOP使用场景的,用Matrix可以简化你的切面开发。例如:
    • 根据不同的业务逻辑,指定所有的注解由同一个或者多个拦截类来拦截;也可以指定不同的注解由不同的切面拦截类来拦截;更可以指定不同的接口和实现类,由不同的拦截类来拦截
    • 如果注解很多,可以指定,你只关心哪些类注解,哪些方法注解,不管这些注解是你自定义的,还是系统定义的
  • 注解加在接口上,还是实现类上,或者没有接口的类,可以随意换
  • 扫描到一个注解后,你可以做一些处理,例如你可以把注解对应的数据存入数据库
  • 强大的注解扫描和拦截功能,在不侵入业务代码的前提下(只是需要在业务端加入一个注解而已),你可以实现业务应用,例如API监控统计、API健康检查等

Spring Registrar机制

参考@FeignClient的用法

Spring Import Selector机制

参考@EnableCircuitBreaker的用法

兼容

最新版本兼容

  • Spring 4.x.x和Spring Boot 1.x.x
  • Spring 5.x.x和Spring Boot 2.x.x

依赖

<dependency>
    <groupId>com.nepxion</groupId>
    <artifactId>matrix-aop</artifactId>
    <version>${matrix.version}</version>
</dependency>

Spring AutoProxy机制的示例

注意

拦截实现类中@Component注解一定要加名称,因为全局拦截机制是根据名称BeanName来的

@Component("myInterceptor1")
public class MyInterceptor1 extends AbstractInterceptor {
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        ......
    }
}

示例

调用入口1,通过全局拦截器实现对类头部注解的扫描和代理,详细用法可参考示例3

package com.nepxion.matrix.proxy.simple.aop;

/**
 * <p>Title: Nepxion Matrix</p>
 * <p>Description: Nepxion Matrix AOP</p>
 * <p>Copyright: Copyright (c) 2017-2050</p>
 * <p>Company: Nepxion</p>
 * @author Haojun Ren
 * @version 1.0
 */

import java.lang.annotation.Annotation;

import org.aopalliance.intercept.MethodInterceptor;
import org.springframework.stereotype.Component;

import com.nepxion.matrix.proxy.aop.DefaultAutoScanProxy;
import com.nepxion.matrix.proxy.mode.ProxyMode;
import com.nepxion.matrix.proxy.mode.ScanMode;

// 通过全局拦截器实现对类头部注解的扫描和代理
// 该类描述的逻辑是,目标接口或者类头部如果出现了MyAnnotation1注解,那么该接口或者类下面所有的方法都会被执行扫描和代理,代理类为MyInterceptor1
@Component("myAutoScanProxyForClass")
public class MyAutoScanProxyForClass extends DefaultAutoScanProxy {
    private static final long serialVersionUID = -5968030133395182024L;

    // 多个包路径,用“;”分隔
    private static final String SCAN_PACKAGES = "com.nepxion.matrix.proxy.simple";

    @SuppressWarnings("rawtypes")
    private Class[] commonInterceptorClasses;

    @SuppressWarnings("rawtypes")
    private Class[] classAnnotations;

    public MyAutoScanProxyForClass() {
        super(SCAN_PACKAGES, ProxyMode.BY_CLASS_ANNOTATION_ONLY, ScanMode.FOR_CLASS_ANNOTATION_ONLY);
    }

    @SuppressWarnings("unchecked")
    @Override
    protected Class<? extends MethodInterceptor>[] getCommonInterceptors() {
        if (commonInterceptorClasses == null) {
            commonInterceptorClasses = new Class[] { MyInterceptor1.class };
        }
        return commonInterceptorClasses;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected Class<? extends Annotation>[] getClassAnnotations() {
        if (classAnnotations == null) {
            classAnnotations = new Class[] { MyAnnotation1.class };
        }
        return classAnnotations;
    }

    @Override
    protected void classAnnotationScanned(Class<?> targetClass, Class<? extends Annotation> classAnnotation) {
        System.out.println("Class annotation scanned, targetClass=" + targetClass + ", classAnnotation=" + classAnnotation);
    }
}

调用入口2,通过额外拦截器实现对方法头部注解的扫描和代理

package com.nepxion.matrix.proxy.simple.aop;

/**
 * <p>Title: Nepxion Matrix</p>
 * <p>Description: Nepxion Matrix AOP</p>
 * <p>Copyright: Copyright (c) 2017-2050</p>
 * <p>Company: Nepxion</p>
 * @author Haojun Ren
 * @version 1.0
 */

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.nepxion.matrix.proxy.aop.DefaultAutoScanProxy;
import com.nepxion.matrix.proxy.mode.ProxyMode;
import com.nepxion.matrix.proxy.mode.ScanMode;
import com.nepxion.matrix.proxy.simple.service.MyService2Impl;

// 通过额外拦截器实现对方法头部注解的扫描和代理
// 该类描述的逻辑是,目标接口或者类的某个方法上如果出现了MyAnnotation2注解,那么该接口或者类下面所有的方法都会被执行扫描和代理,并为该接口或者类指定一个具体的代理类为MyInterceptor2
@Component("myAutoScanProxyForMethod")
public class MyAutoScanProxyForMethod extends DefaultAutoScanProxy {
    private static final long serialVersionUID = -481395242918857264L;

    private static final String[] SCAN_PACKAGES = { "com.nepxion.matrix.proxy.simple" };

    @SuppressWarnings("rawtypes")
    private Class[] methodAnnotations;

    @Autowired
    private MyInterceptor2 myInterceptor2;

    private Object[] myInterceptor2Array;

    public MyAutoScanProxyForMethod() {
        super(SCAN_PACKAGES, ProxyMode.BY_METHOD_ANNOTATION_ONLY, ScanMode.FOR_METHOD_ANNOTATION_ONLY);
    }

    @Override
    protected Object[] getAdditionalInterceptors(Class<?> targetClass) {
        if (targetClass == MyService2Impl.class) {
            return getMyInterceptor2Array();
        }
        return null;
    }

    private Object[] getMyInterceptor2Array() {
        if (myInterceptor2Array == null) {
            myInterceptor2Array = new Object[] { myInterceptor2 };
        }
        return myInterceptor2Array;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected Class<? extends Annotation>[] getMethodAnnotations() {
        if (methodAnnotations == null) {
            methodAnnotations = new Class[] { MyAnnotation2.class };
        }
        return methodAnnotations;
    }

    @Override
    protected void methodAnnotationScanned(Class<?> targetClass, Method method, Class<? extends Annotation> methodAnnotation) {
        System.out.println("Method annotation scanned, targetClass=" + targetClass + ", method=" + method + ", methodAnnotation=" + methodAnnotation);
    }
}

更复杂的用法请参考com.nepxion.matrix.proxy.complex目录下的代码

Spring Registrar机制的示例

参考matrix-spring-boot-registrar-example

Spring Import Selector机制的示例

参考matrix-spring-boot-selector-example

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简介

🔑 Nepxion Matrix is an AOP framework integrated with Spring AutoProxy, Spring Registrar and Spring Import Selector with high universality, robustness, flexibility and usability 面向注解的业务场景,包括代理、拦截、开关 展开 收起
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