EventService.java

package gov.samhsa.consent2share.infrastructure.eventlistener;

import gov.samhsa.consent2share.domain.SecurityEvent;

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

import org.springframework.context.ApplicationEvent;

/**
 * The Class EventService.
 */
public class EventService implements
		org.springframework.context.ApplicationListener {

	/** The listeners. */
	List<EventListener> listeners = new ArrayList<EventListener>();

	/**
	 * Method that allows registering of an Event Listener.
	 *
	 * @param listener
	 *            the listener
	 */
	public void registerListener(EventListener listener) {
		listeners.add(listener);
	}

	/**
	 * Spring executes this method with the event object. This method iterates
	 * though the list of registered Listeners and checks whether any listener
	 * can handle the event. Calls handle method of the Listener if it can
	 * handle the event.
	 *
	 * @param event
	 *            the event
	 */
	public void onApplicationEvent(ApplicationEvent event) {
		dispatchEvent(event);
	}

	/**
	 * Raise security event.
	 *
	 * @param securityEvent
	 *            the security event
	 */
	public void raiseSecurityEvent(SecurityEvent securityEvent) {
		dispatchEvent(securityEvent);
	}

	/**
	 * Dispatch event.
	 *
	 * @param event
	 *            the event
	 */
	private void dispatchEvent(Object event) {
		for (EventListener listener : listeners) {
			if (listener.canHandle(event)) {
				listener.handle(event);
			}
		}
	}
}