事件通知

  

事件通知方

package com.common.event;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import org.springframework.context.ApplicationContext;
import com.common.web.AppContext;

public class EventSource {

	protected Class<? extends EventListener<?>> listenerIntf;
	
	public EventSource(Class<? extends EventListener<?>> listenerIntf){
		if (listenerIntf == null){
			throw new IllegalArgumentException("ListenerIntf should not be null!");
		}
		String baseListenerPackageName = EventListener.class.getPackage().getName();
		if (listenerIntf.getCanonicalName().equals(baseListenerPackageName + ".EventListener")){
			throw new IllegalArgumentException("Module business should define it's own EventListener!");
		}
		
		this.listenerIntf = listenerIntf;
	}
	
	public EventSource(){
		
	}

	public void sendNotify() {
		ApplicationContext applicationContext =  AppContext.getContext();
		if (listenerIntf == null){
			throw new NullPointerException("listenerIntf should not null!");
		}
		Map<String, ?> map = applicationContext.getBeansOfType(listenerIntf);
		if (map != null && !map.isEmpty()){
			Collection<?> classes = map.values();
			Iterator<?> iterator = classes.iterator();
			while (iterator.hasNext()){
				@SuppressWarnings("unchecked")
				EventListener<EventSource> listener = (EventListener<EventSource>)iterator.next();
				listener.handleEvent(this);
			}
		}
	}
}

事件接收方：

public interface EventListener<T extends EventSource> extends java.util.EventListener {

    public void handleEvent(T eventSource);
}