创建一个简单的事件驱动架构 [英] Creating a simple event driven architecture
问题描述
有一点麻烦,此刻的项目。我采取一个游戏,我想它有事件驱动的。
Having a bit of trouble with a project at the moment. I am implementing a game and I'd like to have it event-driven.
到目前为止,我有其中有一个重载的方法取决于产生什么类型的事件(的PlayerMove,联系方式,攻击等)的事件处理程序类
So far I have an EventHandler class which has an overloaded method depending on what type of event is generated(PlayerMove, Contact, Attack, etc)
我将可以进行游戏驱动程序或类生成的事件。我的问题是我怎么能高效地处理事件,而不需要紧密耦合的事件生成类的事件处理程序,使利用EDA多余的?
I will have either the game driver or the class generate the events. My question is how can I efficiently handle the events without tightly coupling the event generating classes to the event handler and making the use of EDA redundant?
我要设计我自己简单的处理器,而不是使用内置Java一个用于此
I want to design my own simple handler and not use the built-in Java one for this
推荐答案
如果您想与重载方法,你的事件类型单一事件处理程序
类没有任何子类,那么这个简单的code,它使用反射,应该工作:
If you want to have a single EventHandler
class with overloaded methods and your event types do not have any subclasses, then this simple code, which uses reflection, should work:
public class EventHandler {
public void handle (final PlayerMove move) {
//... handle
}
public void handle (final Contact contact) {
//... handle
}
public void handle (final Attack attack) {
//... handle
}
}
public void sendEvent (final EventHandler handler, final Object event) {
final Method method = EventHandler.class.getDeclaredMethod ("handle", new Class[] {event.getClass ()});
method.invoke (handler, event);
}
不过,如果你想拥有单独的事件处理程序
S代表不同的事件,下面的效果会更好。
However, if you want to have seperate EventHandler
s for different events, the following would be better.
public interface EventHandler<T extends Event> {
void handle (T event);
}
public class PlayerMoveEventHandler implements EventHandler<PlayerMove> {
@Override
public void handle (final PlayerMove event) {
//... handle
}
}
public class EventRouter {
private final Map<Class, EventHandler> eventHandlerMap = new HashMap<Class, EventHandler> ();
public void sendEvent (final Event event) {
eventHandlerMap.get (event.getClass ()).handle (event);
}
public void registerHandler (final Class eventClass, final EventHandler handler) {
eventHandlerMap.put (eventClass, handler);
}
}
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