【java】简单的事件总线EventBus

public class EventBus {

    private static Map<String, EventListener> eventListeners = new HashMap<>();

    public static void addEventListener(EventListener listener) {
        String listenerName = getListenerName(listener);
        eventListeners.put(listenerName, listener);
    }

    public static void removeEventListener(EventListener listener) {
        String listenerName = getListenerName(listener);
        eventListeners.remove(listenerName);
    }

    public static void sendEvent(Event event) {
        Collection<EventListener> listeners = eventListeners.values();
        for (EventListener listener : listeners) {
            if (listener != null) {
                listener.onEvent(event);
            }
        }
    }

    private static String getListenerName(TMSEventListener listener) {
        String listenerName = listener.getName();
        if (StringUtils.isBlank(listenerName)) {
            listenerName = listener.getClass().getName();
        }
        return listenerName;
    }

}

public interface EventListener {

    /**
     * 监听到事件后会调用此函数
     * @param event
     */
    public void onEvent(Event event);

    /**
     * 事件监听器的唯一名字
     * @return 字符串
     */
    public String getName();
}

public class Event {

    private String name;
    private Object data;

    public Event() {
    }

    public Event(String name,Object data) {
        this.data = data;
        this.name = name;
    }

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.data = data;
    }

    public String getName() {
        return name;
    }

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

}