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作者 | 正文 |
发表时间:2008-10-20
最后修改:2009-02-24
1.那即将离我远去的用buffalo作为我的ajax类库也有些历史了,几乎是和Spring同时开始接触的. 按照官方的方式,Buffalo与Spring的集成是很简单: 在Spring中配置一个BuffaloServiceConfigure bean,把spring托管的服务在其中声明即可,Buffalo可以通过ServletContext得到Spring的WebApplicationContext,进而得到所需的服务: <bean name="buffaloConfigBean" class="net.buffalo.service.BuffaloServiceConfigurer"> <property name="services"> <map> <entry key="springSimpleService"> <ref bean="systemService" /> </entry> <entry key="springSimpleService2"> <ref bean="systemService2" /> </entry> </map> </property> </bean>
似乎很简单,但,有没有觉得似乎很傻?只是把Spring里已经配置好的bean再引用一次而已, 一旦面临协作开发,和所有的全局配置文件一样,BuffaloServiceConfigure bean下面就会囊括几十上百个service ref,一大堆人围着这个配置文件转,CVS冲突就成了家常便饭了,苦恼不已.当然,按我们这么多年的开发经验是不会出现这种低级错误的,早早的在项目设计阶段就会按模块划分出多个配置文件,一人独用,无需和别人共享配置,轻松面对冲突问题,带来的局面就是每个包里都塞着一个buffalo.xml,一个项目里配置文件到处有,不断得copy/paste,层层套套,那可不是硕果累累的满足感. 当然,Spring本身在2.5之前也因XML配置繁琐而让人诟病,Guice才能异军突起,那时Spring比Buffalo的配置更多,所以Buffalo的问题也就不是问题了.但有一天,我终于要正式升级到Spring2.5. 世界清静了!使用annotation,看到怎么多配置文件消失,看到简洁的Bean/MVC配置,呵呵,还真是令人心情愉悦的. 诶,等等,怎么还有大堆XML?哦?原来是Buffalo... Buffalo像个刺头,傻愣愣地杵在XML里.
2.于是我开始把Buffalo也Annotation化.
话说Spring的扩展能力还是ganggang的,一天时间,就有成果了. 先写个注解: package cn.tohot.common.annotation; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; /** * buffalo扩展接口,用于表明该类是一个buffalo服务. * @author tedeyang * */ @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.TYPE) public @interface Buffalo { /** * @return 远程调用时的服务名. */ String value(); }
接着再写Spring的扩展
/** * */ package cn.tohot.common.annotation; import java.util.HashMap; import net.buffalo.service.BuffaloServiceConfigurer; import org.apache.log4j.Logger; import org.springframework.beans.BeansException; import org.springframework.beans.factory.DisposableBean; import org.springframework.beans.factory.FactoryBean; import org.springframework.beans.factory.InitializingBean; import org.springframework.beans.factory.config.BeanPostProcessor; /** * 该类作为FactoryBean可以无缝替换buffalo 2.0自带的配置类,并使用annotation进行配置. * @author tedeyang * */ @SuppressWarnings("unchecked") public class BuffaloAnnotationServiceFactoryBean implements FactoryBean, InitializingBean, DisposableBean, BeanPostProcessor { private static final Logger log = Logger.getLogger(BuffaloAnnotationServiceFactoryBean.class); private BuffaloServiceConfigurer buffaloConfigurer = null; public BuffaloAnnotationServiceFactoryBean() { buffaloConfigurer = new BuffaloServiceConfigurer(); buffaloConfigurer.setServices(new HashMap()); } private void addBuffaloBean(String buffaloServiceName,Object bean) { buffaloConfigurer.getServices().put(buffaloServiceName, bean); log.info("Add a buffalo service :"+buffaloServiceName); } public Object getObject() throws Exception { return this.buffaloConfigurer; } public Class getObjectType() { return BuffaloServiceConfigurer.class; } public boolean isSingleton() { return true; } public void afterPropertiesSet() throws Exception { } public void destroy() throws Exception { if (buffaloConfigurer != null) buffaloConfigurer.setServices(null); buffaloConfigurer = null; } public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { return bean; } public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { log.debug("find a bean:"+beanName); if (bean.getClass().isAnnotationPresent(Buffalo.class)) { Buffalo buffalo = bean.getClass().getAnnotation(Buffalo.class); addBuffaloBean(buffalo.value(), bean); } return bean; } }
主要思路是用FactoryBean替换原BuffaloServiceConfigurer,并挂上BeanPostProcessor的钩子,检测一下annotation,发现buffalo服务就添加到原BuffaloServiceConfigurer中去.
3.今天我这样配置Buffalo:<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"> <!-- Spring Annotation配置, 自动搜索组件 --> <context:component-scan base-package="cn.tohot.demo"/> <bean id="buffalo" class="cn.tohot.common.annotation.BuffaloAnnotationServiceFactoryBean" /> </beans> 服务端的Buffalo bean 类: package cn.tohot.demo; import org.springframework.stereotype.Service; import cn.tohot.common.annotation.Buffalo; @Service //声明Spring bean, @Buffalo("testbean") //声明一个名为"testbean"的Buffalo service public class BuffaloBeanTestService { public String run() { System.out.println("run"); return "run"; } } 很简洁,不是吗? 声明:ITeye文章版权属于作者,受法律保护。没有作者书面许可不得转载。
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发表时间:2008-10-20
不错,自此又少了很多烦人的xml。
没有了service.xml,没有了controller.xml,没有了buffalo.xml 世界清静了很多。。。。 |
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