mooore stuff

app/src/main/java/common/Signal.java

@@ -0,0 +1,31 @@
+package common;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class Signal {
+
+	private final Set<Runnable> listeners;
+
+	public Signal() {
+		this.listeners = new HashSet<>();
+	}
+
+	public void connect(Runnable listener) {
+		this.listeners.add(listener);
+	}
+
+	public void clear() {
+		this.listeners.clear();
+	}
+
+	public void emit() {
+		for (Runnable listener : this.listeners) {
+			listener.run();
+		}
+	}
+	
+	// public void disconnect(Runnable listener) {
+	// 	this.listeners.remove(listener);
+	// }
+}