Remove EventListener and IEvent marker interfaces

This allows Event Bus to interface with existing classes without
modification.

event-bus-core/src/main/java/dev/kske/eventbus/core/Event.java

@@ -9,10 +9,9 @@ import java.lang.annotation.*;
  * Indicates that a method is an event handler. To be successfully used as such, the method has to
  * comply with the following specifications:
  * <ul>
- * <li>Declared inside a class that implements {@link EventListener}</li>
  * <li>Specifying an event type by either
  * <ul>
- * <li>Declaring one parameter of a type that implements {@link IEvent}</li>
+ * <li>Declaring one object parameter</li>
  * <li>Defining the class of the event using the annotation value</li>
  * </ul>
  * </li>
@@ -38,7 +37,7 @@ public @interface Event {
 	 * @return the event type accepted by the handler
 	 * @since 1.0.0
 	 */
-	Class<? extends IEvent> value() default USE_PARAMETER.class;
+	Class<?> value() default USE_PARAMETER.class;
 
 	/**
 	 * Signifies that the event type the handler listens to is determined by the type of its only
@@ -46,5 +45,5 @@ public @interface Event {
 	 *
 	 * @since 0.0.3
 	 */
-	static final class USE_PARAMETER implements IEvent {}
+	static final class USE_PARAMETER {}
 }

event-bus-core/src/main/java/dev/kske/eventbus/core/EventBus.java

@@ -51,11 +51,11 @@ public final class EventBus {
 		return instance;
 	}
 
-	private final Map<Class<? extends IEvent>, TreeSet<EventHandler>>	bindings			=
+	private final Map<Class<?>, TreeSet<EventHandler>>	bindings			=
 		new ConcurrentHashMap<>();
-	private final Set<EventListener>									registeredListeners	=
+	private final Set<Object>							registeredListeners	=
 		ConcurrentHashMap.newKeySet();
-	private final ThreadLocal<DispatchState>							dispatchState		=
+	private final ThreadLocal<DispatchState>			dispatchState		=
 		ThreadLocal.withInitial(DispatchState::new);
 
 	/**
@@ -65,7 +65,7 @@ public final class EventBus {
 	 * @param event the event to dispatch
 	 * @since 0.0.1
 	 */
-	public void dispatch(IEvent event) {
+	public void dispatch(Object event) {
 		Objects.requireNonNull(event);
 		logger.log(Level.INFO, "Dispatching event {0}", event);
 
@@ -95,7 +95,7 @@ public final class EventBus {
 	 * @return all event handlers registered for the event class
 	 * @since 0.0.1
 	 */
-	private List<EventHandler> getHandlersFor(Class<? extends IEvent> eventClass) {
+	private List<EventHandler> getHandlersFor(Class<?> eventClass) {
 
 		// Get handlers defined for the event class
 		Set<EventHandler> handlers = bindings.getOrDefault(eventClass, new TreeSet<>());
@@ -133,7 +133,7 @@ public final class EventBus {
 	 * @since 0.0.1
 	 * @see Event
 	 */
-	public void registerListener(EventListener listener) throws EventBusException {
+	public void registerListener(Object listener) throws EventBusException {
 		Objects.requireNonNull(listener);
 		if (registeredListeners.contains(listener))
 			throw new EventBusException(listener + " already registered!");
@@ -170,7 +170,7 @@ public final class EventBus {
 	 * @param listener the listener to remove
 	 * @since 0.0.1
 	 */
-	public void removeListener(EventListener listener) {
+	public void removeListener(Object listener) {
 		Objects.requireNonNull(listener);
 		logger.log(Level.INFO, "Removing event listener {0}", listener.getClass().getName());
 
@@ -204,7 +204,7 @@ public final class EventBus {
 	 * @return all registered event listeners
 	 * @since 0.0.1
 	 */
-	public Set<EventListener> getRegisteredListeners() {
+	public Set<Object> getRegisteredListeners() {
 		return Collections.unmodifiableSet(registeredListeners);
 	}
 }

event-bus-core/src/main/java/dev/kske/eventbus/core/EventHandler.java

@@ -21,12 +21,12 @@ final class EventHandler implements Comparable<EventHandler> {
 	 */
 	public static final int DEFAULT_PRIORITY = 100;
 
-	private final EventListener				listener;
-	private final Method					method;
-	private final Class<? extends IEvent>	eventType;
-	private final boolean					useParameter;
-	private final boolean					polymorphic;
-	private final int						priority;
+	private final Object	listener;
+	private final Method	method;
+	private final Class<?>	eventType;
+	private final boolean	useParameter;
+	private final boolean	polymorphic;
+	private final int		priority;
 
 	/**
 	 * Constructs an event handler.
@@ -38,8 +38,7 @@ final class EventHandler implements Comparable<EventHandler> {
 	 *                           specification
 	 * @since 0.0.1
 	 */
-	@SuppressWarnings("unchecked")
-	EventHandler(EventListener listener, Method method, Event annotation) throws EventBusException {
+	EventHandler(Object listener, Method method, Event annotation) throws EventBusException {
 		this.listener	= listener;
 		this.method		= method;
 		useParameter	= annotation.value() == USE_PARAMETER.class;
@@ -57,17 +56,8 @@ final class EventHandler implements Comparable<EventHandler> {
 		if (!method.getReturnType().equals(void.class))
 			throw new EventBusException(method + " does not have a return type of void!");
 
-		// Determine the event type
-		if (useParameter) {
-			var param = method.getParameterTypes()[0];
-			if (!IEvent.class.isAssignableFrom(param))
-				throw new EventBusException(param + " is not of type IEvent!");
-			eventType = (Class<? extends IEvent>) param;
-		} else {
-			eventType = annotation.value();
-		}
-
-		// Determine additional handler properties
+		// Determine handler properties
+		eventType	= useParameter ? method.getParameterTypes()[0] : annotation.value();
 		polymorphic	= method.isAnnotationPresent(Polymorphic.class);
 		priority	= method.isAnnotationPresent(Priority.class)
 			? method.getAnnotation(Priority.class).value()
@@ -107,7 +97,7 @@ final class EventHandler implements Comparable<EventHandler> {
 	 * @throws EventBusException if the handler throws an exception
 	 * @since 0.0.1
 	 */
-	void execute(IEvent event) throws EventBusException {
+	void execute(Object event) throws EventBusException {
 		try {
 			if (useParameter)
 				method.invoke(listener, event);
@@ -122,13 +112,13 @@ final class EventHandler implements Comparable<EventHandler> {
 	 * @return the listener containing this handler
 	 * @since 0.0.1
 	 */
-	EventListener getListener() { return listener; }
+	Object getListener() { return listener; }
 
 	/**
 	 * @return the event type this handler listens for
 	 * @since 0.0.3
 	 */
-	Class<? extends IEvent> getEventType() { return eventType; }
+	Class<?> getEventType() { return eventType; }
 
 	/**
 	 * @return the priority of this handler

event-bus-core/src/main/java/dev/kske/eventbus/core/EventListener.java

@@ -1,12 +0,0 @@
-package dev.kske.eventbus.core;
-
-/**
- * Marker interface for event listeners. Event listeners can contain event handling methods to which
- * events can be dispatched.
- *
- * @author Kai S. K. Engelbart
- * @since 0.0.1
- * @see Event
- * @see EventBus
- */
-public interface EventListener {}

event-bus-core/src/main/java/dev/kske/eventbus/core/IEvent.java

@@ -1,12 +0,0 @@
-package dev.kske.eventbus.core;
-
-/**
- * Marker interface for event objects. Event objects can be used as event handler parameters and
- * thus can be dispatched to the event bus.
- *
- * @author Kai S. K. Engelbart
- * @since 0.0.1
- * @see Event
- * @see EventBus
- */
-public interface IEvent {}

event-bus-core/src/test/java/dev/kske/eventbus/core/CancelTest.java

@@ -11,7 +11,7 @@ import org.junit.jupiter.api.*;
  * @author Leon Hofmeister
  * @since 0.1.0
  */
-class CancelTest implements EventListener {
+class CancelTest {
 
 	EventBus	bus;
 	int			hits;

event-bus-core/src/test/java/dev/kske/eventbus/core/DispatchTest.java

@@ -10,7 +10,7 @@ import org.junit.jupiter.api.*;
  * @author Kai S. K. Engelbart
  * @since 0.0.1
  */
-class DispatchTest implements EventListener {
+class DispatchTest {
 
 	EventBus	bus;
 	static int	hits;
@@ -27,7 +27,7 @@ class DispatchTest implements EventListener {
 	}
 
 	/**
-	 * Tests {@link EventBus#dispatch(IEvent)} with multiple handler priorities, a subtype handler
+	 * Tests {@link EventBus#dispatch(Object)} with multiple handler priorities, a subtype handler
 	 * and a static handler.
 	 *
 	 * @since 0.0.1

event-bus-core/src/test/java/dev/kske/eventbus/core/SimpleEvent.java

@@ -6,4 +6,4 @@ package dev.kske.eventbus.core;
  * @author Kai S. K. Engelbart
  * @since 0.0.1
  */
-public class SimpleEvent implements IEvent {}
+public class SimpleEvent {}