Re-write EventBus to be faster

worldedit-core/src/test/java/com/sk89q/worldedit/util/eventbus/EventBusTest.java

@@ -0,0 +1,53 @@
+package com.sk89q.worldedit.util.eventbus;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static java.util.Arrays.asList;
+import static java.util.Collections.singletonList;
+import static org.junit.Assert.assertEquals;
+
+public class EventBusTest {
+
+    private static final class Event {
+
+    }
+
+    private static final class Subscriber {
+
+        private final List<Event> events = new ArrayList<>();
+
+        @Subscribe
+        public void onEvent(Event event) {
+            events.add(event);
+        }
+
+    }
+
+    private EventBus eventBus = new EventBus();
+
+    @Test
+    public void testRegister() {
+        Subscriber subscriber = new Subscriber();
+        eventBus.register(subscriber);
+        Event e1 = new Event();
+        eventBus.post(e1);
+        Event e2 = new Event();
+        eventBus.post(e2);
+        assertEquals(asList(e1, e2), subscriber.events);
+    }
+
+    @Test
+    public void testUnregister() {
+        Subscriber subscriber = new Subscriber();
+        eventBus.register(subscriber);
+        Event e1 = new Event();
+        eventBus.post(e1);
+        eventBus.unregister(subscriber);
+        Event e2 = new Event();
+        eventBus.post(e2);
+        assertEquals(singletonList(e1), subscriber.events);
+    }
+}