優勢
起源
要講spring的事件通知機制，就要先了解一下spring中的這些接口和抽象類：
構建自己的事件機制案例
測試案例
測試入口
package com.meituan.spring.testcase.listener;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.concurrent.TimeUnit;
/**
* Created by zhangxiaoguang on 16/1/27 下午11:40.
* -----------------------------
* Desc:
*/
public class TestPortal {
public static void main(String[] args) throws InterruptedException {
final ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-config.xml");
String[] definitionNames = applicationContext.getBeanDefinitionNames();
System.out.println("==============bean====start=================");
for (String definitionName : definitionNames) {
System.out.println("bean----:" + definitionName);
}
System.out.println("==============bean====end=================");
System.out.println();
final CustomizePublisher customizePublisher = applicationContext.getBean(CustomizePublisher.class);
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
try {
System.out.println("開始吃飯：");
MealEvent lunchEvent = new MealEvent("A吃午飯了", MealEnum.lunch);
MealEvent breakfastEvent = new MealEvent("B吃早飯了", MealEnum.breakfast);
MealEvent dinnerEvent = new MealEvent("C吃晚飯了", MealEnum.dinner);
customizePublisher.publish(lunchEvent);
TimeUnit.SECONDS.sleep(1l);
customizePublisher.publish(breakfastEvent);
TimeUnit.SECONDS.sleep(1l);
customizePublisher.publish(dinnerEvent);
TimeUnit.SECONDS.sleep(1l);
System.out.println("他們吃完了！");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
});
thread.setName("meal-thread");
thread.start();
System.out.println(Thread.currentThread().getName() + " is waiting for ....");
thread.join();
System.out.println("Done!!!!!!!!!!!!");
}
}
TestPortal
測試結果
接受全部事件的演員（很負責任啊）
package com.meituan.spring.testcase.listener;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;
/**
* Created by zhangxiaoguang on 16/1/27 下午11:27.
* -----------------------------
* Desc:
*/
@Component
public class AllAcceptedListener implements ApplicationListener<ApplicationEvent> {
@Override
public void onApplicationEvent(ApplicationEvent event) {
System.out.println(">>>>>>>>>>>>>>>>event:" + event);
}
}
AllAcceptedListener
導演負責分發事件
package com.meituan.spring.testcase.listener;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEventPublisherAware;
import org.springframework.stereotype.Component;
/**
* Created by zhangxiaoguang on 16/1/28 上午1:41.
* -----------------------------
* Desc:
*/
@Component
public class CustomizePublisher implements ApplicationEventPublisherAware {
private ApplicationEventPublisher applicationEventPublisher;
public void publish(MealEvent event) {
applicationEventPublisher.publishEvent(event);
}
@Override
public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
this.applicationEventPublisher = applicationEventPublisher;
}
}
CustomizePublisher
負責處理吃飯事件的演員
package com.meituan.spring.testcase.listener;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;
/**
* Created by zhangxiaoguang on 16/1/27 下午11:27.
* -----------------------------
* Desc:
*/
@Component
public class MealListener implements ApplicationListener<MealEvent> {
@Override
public void onApplicationEvent(MealEvent event) {
System.out.println(String.format(">>>>>>>>>>>thread:%s,type:%s,event:%s",
Thread.currentThread().getName(), event.getMealEnum(), event));
dispatchEvent(event);
}
private void dispatchEvent(MealEvent event) {
switch (event.getMealEnum()) {
case breakfast:
System.out.println(event.getMealEnum() + " to handle!!!");
break;
case lunch:
System.out.println(event.getMealEnum() + " to handle!!!");
break;
case dinner:
System.out.println(event.getMealEnum() + " to handle!!!");
break;
default:
System.out.println(event.getMealEnum() + " error!!!");
break;
}
}
}
MealListener
吃飯消息
package com.meituan.spring.testcase.listener;
import org.springframework.context.ApplicationEvent;
/**
* Created by zhangxiaoguang on 16/1/27 下午11:24.
* -----------------------------
* Desc:吃飯事件
*/
public class MealEvent extends ApplicationEvent {
private MealEnum mealEnum;
/**
* @param mealContent
* 吃什麼
* @param mealEnum
* 早餐還是午餐？
*/
public MealEvent(String mealContent, MealEnum mealEnum) {
super(mealContent);
this.mealEnum = mealEnum;
}
public MealEnum getMealEnum() {
return mealEnum;
}
}
MealEvent
工具
package com.meituan.spring.testcase.listener;
/**
* Created by zhangxiaoguang on 16/1/27 下午11:29.
* -----------------------------
* Desc:
*/
public enum MealEnum {
breakfast,
lunch,
dinner
}
MealEnum
令人厭煩的演員
package com.meituan.spring.testcase.listener;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;
/**
* Created by zhangxiaoguang on 16/1/27 下午11:27.
* -----------------------------
* Desc:
*/
@Component
public class TroubleListener implements ApplicationListener<TroubleEvent> {
@Override
public void onApplicationEvent(TroubleEvent event) {
System.out.println(">>>>>>>>>>>>>>>>event:" + event);
}
}
TroubleListener
令人厭煩的事件
package com.meituan.spring.testcase.listener;
import org.springframework.context.ApplicationEvent;
/**
* Created by zhangxiaoguang on 16/1/27 下午11:24.
* -----------------------------
* Desc:令人厭煩的事件
*/
public class TroubleEvent extends ApplicationEvent {
public TroubleEvent(Object source) {
super(source);
}
}
TroubleEvent
總結
詳細定制 event 類型的，則相關定制的listener會處理對應的消息，其他listener不會管閒事；
制定頂級 event 類型的，ApplicationEvent的，則會處理所有的事件。
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