事件模型监听器EventObject

参照 https://www.cnblogs.com/lichmama/p/8976092.html

---

模型:

　　事件Event、事件源Source、监听器Listener

　　事件源注册监听器、事件传入事件源。事件发生，通知监听器，监听器处理

demo:

　　事件Event：

public class Event {

    private Source source;

    public Event(Source source) {
        if(source == null)
            throw new IllegalArgumentException("null source");
        this.source = source;
    }


    public Source getSource() {
        return source;
    }
}

　　

　　事件源Source：

public class Source {

    private String name;

    public void setName(String name){
        this.name = name;
    }

    public String getName() {
        return name;
    }

    private Set<EventListener> listenerSet = new HashSet<>();

    public void registerEventListener(EventListener eventListener){
        if (eventListener != null){
            listenerSet.add(eventListener);
        }
    }

    public void handle(){
        for (EventListener eventListener : listenerSet) {
            ThreadPoolUtil.execute(()-> {
                    Event event = new Event(this);
                    eventListener.callback(event);
            });
        }
    }

}

　　监听器Listener

public interface EventListener {

    void callback(Event e);
    
}

　　测试

public class App {

    public static void main(String[] args) {
        Source source = new Source();
        source.setName("av");

        source.registerEventListener((event)->{
                System.out.println("one....");
                System.out.println(event.getSource().getName());
                System.out.println(Thread.currentThread().getName());
        });

        source.registerEventListener((event)->{
                System.out.println("two....");
                System.out.println(event.getSource().getName());
                System.out.println(Thread.currentThread().getName());
        });

        source.handle();
    }
}

　　结果：

two....
av
pool-1-thread-1
one....
av
pool-1-thread-2