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jongillham/EventManager
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* This acts as a controller for firing events. For example if we have the * following <code>Event</code> object heirachy: * * <pre> * ClientEvent extends Event * LoginEvent extends ClientEvent * LogoutEvent extends ClientEvent * </pre> * * Then add the following <code>EventListener</code> to the * <code>EventManager</code>: * * <pre> * addListener(LoginEvent.class, new EventListener() { * public void eventFired(Event e) { * System.out.println(e.getClass().getName()); * } * }); * </pre> * * The event listener will only be called when <code>fireEvent</code> fires a * new <code>LoginEvent</code> and the output will always be 'LoginEvent'. * However if we made the listener listen for * <code>addListener(ClientEvent.class,</code>... the event listener will be * called for every <code>LoginEvent</code>, <code>LogoutEvent</code> and * <code>ClientEvent</code> making the output either 'LoginEvent', * 'LogoutEvent' or 'ClientEvent'. Ideally each <code>Event</code> subclass * should be immutable so that all event listeners are guaranteed to receive the * same state.
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A thread safe implementation of the Event Bus pattern with a few neat features.
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