Aopalliance

Aopalliance is a joint open-source project between several software engineering people who are interested in AOP and Java.

入门例子

maven 引入

<dependency>
    <groupId>aopalliance</groupId>
    <artifactId>aopalliance</artifactId>
    <version>1.0</version>
</dependency>

编写 AOP 实现

为了突出重点，省略掉相关的具体实现。

详情参考 CacheInterceptor.java

package com.framework.framework.cache.interceptor;

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

import java.lang.reflect.Method;
import java.util.LinkedList;
import java.util.List;


/**
 * @author houbinbin
 * @on 17/1/7
 * 模仿spring的CacheInterceptor
 * 不过spring又进行了更多的封装。此处实现比较简单。
 */
public class CacheInterceptor implements MethodInterceptor {

    protected final Log logger = LogFactory.getLog(this.getClass());

    /**
     * @Cacheable & @CachePut 都应该是单独使用的。
     * AnnotationUtils.findAnnotation
     * @param methodInvocation
     * @return
     * @throws Throwable
     */
    @Override
    public Object invoke(MethodInvocation methodInvocation) throws Throwable {
        // 其他注解相关实现
       return methodInvocation.proceed()
    } 

}

优点

这种优点是不用写一个 AOP 都要依赖于 spring-aop。

但是怎么和 spring 结合呢？

结合 Spring

<bean id="cacheInterceptor" class="com.framework.framework.cache.interceptor.CacheInterceptor">
		<property name="cacheManager" ref="cacheManager" />
	</bean>

<aop:config>
    <aop:pointcut id="cachePointcut"
        expression="@annotation(com.framework.framework.cache.annotation.CacheGetSet) or
        @annotation(com.framework.framework.cache.annotation.CacheRemove)" />
    <aop:advisor advice-ref="cacheInterceptor" pointcut-ref="cachePointcut" />
</aop:config>