Replace the internal event bus with Event Bus 0.0.3

The Event class has been retrofitted to implement IEvent, so that no
event implementations had to be changed.

common/src/main/java/envoy/event/Event.java

@@ -2,7 +2,13 @@ package envoy.event;
 
 import java.io.Serializable;
 
+import dev.kske.eventbus.IEvent;
+
 /**
+ * This class serves as a convenience base class for all events. It implements
+ * the {@link IEvent} interface and provides a generic value. For events without
+ * a value there also is {@link envoy.event.Event.Valueless}.
+ * <p>
  * Project: <strong>envoy-common</strong><br>
  * File: <strong>Event.java</strong><br>
  * Created: <strong>04.12.2019</strong><br>
@@ -11,7 +17,7 @@ import java.io.Serializable;
  * @param <T> the type of the Event
  * @since Envoy v0.2-alpha
  */
-public abstract class Event<T> implements Serializable {
+public abstract class Event<T> implements IEvent, Serializable {
 
 	protected final T value;
 

common/src/main/java/envoy/event/EventBus.java

@@ -1,82 +0,0 @@
-package envoy.event;
-
-import java.util.*;
-import java.util.function.Consumer;
-
-/**
- * This class handles events by allowing event handlers to register themselves
- * and then be notified about certain events dispatched by the event bus.<br>
- * <br>
- * The event bus is a singleton and can be used across the entire application to
- * guarantee the propagation of events.<br>
- * <br>
- * Project: <strong>envoy-common</strong><br>
- * File: <strong>EventBus.java</strong><br>
- * Created: <strong>04.12.2019</strong><br>
- *
- * @author Kai S. K. Engelbart
- * @since Envoy v0.2-alpha
- */
-public final class EventBus {
-
-	/**
-	 * Contains all event handler instances registered at this event bus as values
-	 * mapped to by their supported event classes.
-	 */
-	private Map<Class<? extends Event<?>>, List<Consumer<Event<?>>>> handlers = new HashMap<>();
-
-	/**
-	 * The singleton instance of this event bus that is used across the
-	 * entire application.
-	 */
-	private static EventBus eventBus = new EventBus();
-
-	/**
-	 * This constructor is not accessible from outside this class because a
-	 * singleton instance of it is provided by the {@link EventBus#getInstance()}
-	 * method.
-	 */
-	private EventBus() {}
-
-	/**
-	 * @return the singleton instance of the event bus
-	 * @since Envoy v0.2-alpha
-	 */
-	public static EventBus getInstance() { return eventBus; }
-
-	/**
-	 * Registers an event handler to be notified when an
-	 * event of a certain type is dispatched.
-	 *
-	 * @param <T>        the type of event values to notify the handler about
-	 * @param eventClass the class which the event handler is subscribing to
-	 * @param handler    the event handler to register
-	 * @since Envoy v0.2-alpha
-	 */
-	public <T extends Event<?>> void register(Class<T> eventClass, Consumer<T> handler) {
-		if (!handlers.containsKey(eventClass)) handlers.put(eventClass, new ArrayList<>());
-		handlers.get(eventClass).add((Consumer<Event<?>>) handler);
-	}
-
-	/**
-	 * Dispatches an event to every event handler subscribed to it.
-	 *
-	 * @param event the {@link Event} to dispatch
-	 * @since Envoy v0.2-alpha
-	 */
-	public void dispatch(Event<?> event) {
-		handlers.keySet()
-			.stream()
-			.filter(event.getClass()::equals)
-			.map(handlers::get)
-			.flatMap(List::stream)
-			.forEach(h -> h.accept(event));
-	}
-
-	/**
-	 * @return a map of all event handler instances currently registered at this
-	 *         event bus with the event classes they are subscribed to as keys
-	 * @since Envoy v0.2-alpha
-	 */
-	public Map<Class<? extends Event<?>>, List<Consumer<Event<?>>>> getHandlers() { return handlers; }
-}

common/src/main/java/module-info.java

@@ -16,4 +16,5 @@ module envoy.common {
 	exports envoy.event.contact;
 
 	requires transitive java.logging;
+	requires transitive dev.kske.eventbus;
 }