spring的事件监听

spring的事件监听

参考文章
http://dsm.iteye.com/blog/352674

事件监听其实比较重要的就是三个东东：消息体，接收消息监听者，发布消息广播者。我自己的山寨理解。嘿嘿。
1.消息监听者：
package com.sillycat.easyaop.service.event;
import org.springframework.context.ApplicationEvent;
public class WorkflowEvent extends ApplicationEvent {
private static final long serialVersionUID = -5213335629335022324L;
// 业务ID
private String businessId;
// 业务名称
private String businessName;
public WorkflowEvent(Object source) {
   super(source);
}
public String getBusinessId() {
   return businessId;
}
public void setBusinessId(String businessId) {
   this.businessId = businessId;
}
public String getBusinessName() {
   return businessName;
}
public void setBusinessName(String businessName) {
   this.businessName = businessName;
}
}
2.接收消息监听者
package com.sillycat.easyaop.service.impl;
import javax.annotation.Resource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Service;
import com.sillycat.easyaop.dao.UserDAO;
import com.sillycat.easyaop.model.User;
import com.sillycat.easyaop.service.UserManager;
import com.sillycat.easyaop.service.event.WorkflowEvent;
@Service("userManager")
public class UserManagerImpl implements UserManager, ApplicationListener {
private static Log log = LogFactory.getLog(UserManagerImpl.class);
private UserDAO userDAO;
@Resource(name = "userDAO")
public void setUserDAO(UserDAO userDAO) {
   this.userDAO = userDAO;
}
public User get(Integer id) {
   User user = new User();
   user.setId(Integer.valueOf(1));
   user.setUserName("sillycat");
   user.setUserPassword("******");
   return user;
}
// 接受回调事件
public void onApplicationEvent(ApplicationEvent event) {
   if (event instanceof WorkflowEvent) {
    WorkflowEvent wEvent = (WorkflowEvent) event;
    log.debug(" bussinessId=" + wEvent.getBusinessId()
      + " bussinessName=" + wEvent.getBusinessName());
   }
}
}

3.发布消息广播者
package com.sillycat.easyaop.service.event;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationEvent;
import org.springframework.stereotype.Service;
import com.sillycat.easyaop.service.WorkflowEventService;
@Service("workflowEventService")
public class WorkflowEventServiceImpl implements WorkflowEventService,
   ApplicationContextAware {
private ApplicationContext ctx;
public void setApplicationContext(ApplicationContext applicationContext)
    throws BeansException {
   this.ctx = applicationContext;
}
public void publishEvent(ApplicationEvent event) {
   ctx.publishEvent(event);
}
}

单元测试测试一把
package com.sillycat.easygroovy.service.event;
import com.sillycat.easyaop.service.WorkflowEventService;
import com.sillycat.easyaop.service.event.WorkflowEvent;
import com.sillycat.easygroovy.BaseTestCase;
public class WorkflowEventServiceTest extends BaseTestCase {
private WorkflowEventService service;
public void setUp() {
   super.setUp();
   service = (WorkflowEventService) ctx.getBean("workflowEventService");
}
public void tearDown() throws Exception {
   super.tearDown();
}
public void testPublishWorkflowEvent() {
   WorkflowEvent event = new WorkflowEvent(this);
   event.setBusinessId("1112343");
   event.setBusinessName("告警-流程结束");
   service.publishEvent(event);
}
}