示例代码

package demo.pattern.eventmode;

import lombok.Getter;
import lombok.Setter;

@Getter
@Setter
public class Event {
    private String type;
}

package demo.pattern.eventmode;

public interface EventListener {
    public void processEvent(Event event);
}

package demo.pattern.eventmode;

public class SingleClickEventListener implements EventListener {
    @Override
    public void processEvent(Event event) {
        if("singleclick".equals(event.getType())){
            System.out.println("单击被触发了");
        }
    }
}

package demo.pattern.eventmode;

public class DoubleClickEventListener implements EventListener {
    @Override
    public void processEvent(Event event) {
        if("doubleclick".equals(event.getType())){
            System.out.println("双击被触发了");
        }
    }
}

package demo.pattern.eventmode;

import java.util.ArrayList;
import java.util.List;

public class EventSource {
    private List<EventListener> listenerList = new ArrayList<>();
    
    public void register(EventListener listener){
        listenerList.add(listener);  // 注册
    }
    
    public void publishEvent(Event event){
        for(EventListener listener: listenerList){
            listener.processEvent(event);  // 注册事件
        }
    }
}

package demo.pattern.eventmode;

public class EventModeDemo {
    public static void main(String[] args) {
        EventSource eventSource = new EventSource();
        SingleClickEventListener singleClickEventListener = new SingleClickEventListener();
        DoubleClickEventListener doubleClickEventListener = new DoubleClickEventListener();
        Event event = new Event();
        event.setType("doubleclick");
        eventSource.register(singleClickEventListener);
        eventSource.register(doubleClickEventListener);
        eventSource.publishEvent(event);
    }
}

执行了之后只有doubleClickEventListener响应了事件。

回调函数

往组件注册自定义的方法以便组件在特定场景下调用

Spring的事件驱动模型

事件：ApplicatinEvent抽象类

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