《Pro Spring》学习笔记之ComposablePointcut组合切入点实例

每一个advisor中一般只定义一个切入点，如果有这样的需求，我们相对一个类中的getter和setter方法都进行通知，一般来说只能定义两个切入点来实现，但没有一个切入点可以同时处理两个，当然，我们可以利用新的逻辑创建一个切入点，但更好的方式是使用ComposablePointcut组合切入点，利用他的切入点union(交集)和intersection(并集)的特性组合两个切入点

union和 intersection方法的参数是ClassFilter和MethodMatcher参数

 

调用接受MethodMathcher的union()方法将ComposablePointCut的MethodMatcher改为一个UnionMethodMathcer,他包含现有的MethodMatcher和union()的MethodMatcher的并集，当任何一个返回true时候，则UnionMethodMathcer返回true,参数ClassFilter也会生成类似的结构

intersection原理和union类似，只是当两个MethodMathcer全部为true方返回true

 

BeanOne.java

 

package  ch6.SimpleAOP.MethodMatchNamePointCut;

public   class  BeanOne  ... {
   public void foo()...{
       System.out.println("foo-no-arg");
   }
   public void foo(int a)...{
       System.out.println("foo-with-arg");
   }
}

 

SimpleAdvise.java

 

package  ch6.SimpleAOP.MethodMatchNamePointCut;

import  org.aopalliance.intercept.MethodInterceptor;
import  org.aopalliance.intercept.MethodInvocation;

public   class  SimpleAdvise  implements  MethodInterceptor  ... {

    public Object invoke(MethodInvocation invocation) throws Throwable ...{
        System.out.println("before");
        Object retVal=invocation.proceed();
        System.out.println("after");
        return retVal;
    }

}

 

测试

 

package  ch7.ComposablePointCut;

import  java.lang.reflect.Method;

import  org.aopalliance.aop.Advice;
import  org.springframework.aop.Advisor;
import  org.springframework.aop.ClassFilter;
import  org.springframework.aop.framework.ProxyFactory;
import  org.springframework.aop.support.ComposablePointcut;
import  org.springframework.aop.support.DefaultPointcutAdvisor;
import  org.springframework.aop.support.StaticMethodMatcher;

public   class  Test  ... {

    /** *//**
     * @param args
     */
    public static void main(String[] args) ...{
         BeanOne one=new BeanOne();
        
         BeanOne proxyOne;
    
         //FooMethodMatcher和BarMethodMatcher两个切入点的并集    
         ComposablePointcut pc=new ComposablePointcut(ClassFilter.TRUE,new FooMethodMatcher());
         pc.union(new BarMethodMatcher());
         Advice advice=new SimpleAdvise();
         Advisor advisor=new DefaultPointcutAdvisor(pc,advice);
         
         //FooMethodMatcher和BarMethodMatcher两个切入点的交集
         ComposablePointcut pc1=new ComposablePointcut(ClassFilter.TRUE,new FooMethodMatcher());
         pc1.intersection(new BarMethodMatcher());
         Advice advice1=new SimpleAdvise();
         Advisor advisor1=new DefaultPointcutAdvisor(pc1,advice1);
         
         //创建BeanOne代理（union）
         ProxyFactory pf1=new ProxyFactory();
         pf1.addAdvisor(advisor);
         pf1.setTarget(one);
         proxyOne=(BeanOne)pf1.getProxy();
         
         
         //直接调用foo(union)
         proxyOne.foo();
         proxyOne.bar();
         
         System.out.println("-------------------------");
         
         //创建BeanOne代理（intersection）
         ProxyFactory pf2=new ProxyFactory();
         pf2.addAdvisor(advisor1);
         pf2.setTarget(one);
         proxyOne=(BeanOne)pf2.getProxy();
         
         //直接调用foo(intersection)
         proxyOne.foo();
         proxyOne.bar();
        
         
         
    }
    
    
    //自定义MethodMather类，匹配所有foo开头的方法
    private  static class FooMethodMatcher extends StaticMethodMatcher...{
        public boolean matches(Method method,Class cls)...{
            return (method.getName().startsWith("foo"));
        }
        
    }
//    自定义MethodMather类，匹配所有bar开头的方法
    private  static class BarMethodMatcher extends StaticMethodMatcher...{
        public boolean matches(Method method,Class cls)...{
            return (method.getName().equals("bar"));
        }
        
    }
    


}

 

运行结果：

before
foo-one
after
before
bar-one
after
-------------------------
foo-one
bar-one