Observer Pattern für ResultSet.

src/main/java/de/dhbwstuttgart/typeinference/unify/UnifyResultEvent.java

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+package de.dhbwstuttgart.typeinference.unify;
+
+import de.dhbwstuttgart.typeinference.result.ResultSet;
+
+public class UnifyResultEvent {
+	
+	private ResultSet newTypeResult;
+
+	public UnifyResultEvent(ResultSet newTypeResult) {
+		this.newTypeResult = newTypeResult;
+	}
+
+	public ResultSet getNewTypeResult() {
+		return newTypeResult;
+	}
+}

src/main/java/de/dhbwstuttgart/typeinference/unify/UnifyResultListener.java

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+package de.dhbwstuttgart.typeinference.unify;
+
+public interface UnifyResultListener {
+
+	void onNewTypeResultFound(UnifyResultEvent evt);
+
+}

src/main/java/de/dhbwstuttgart/typeinference/unify/UnifyResultModel.java

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+package de.dhbwstuttgart.typeinference.unify;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import de.dhbwstuttgart.typeinference.result.ResultSet;
+
+public class UnifyResultModel {
+	
+	private List<UnifyResultListener> listeners = new ArrayList<>();
+	
+	public void addUnifyResultListener(UnifyResultListener listenerToAdd) {
+		listeners.add(listenerToAdd);
+	}
+
+	public void removeUnifyResultListener(UnifyResultListener listenerToRemove) {
+		listeners.remove(listenerToRemove);
+	}
+	
+	public void notify(ResultSet newResult) {
+		UnifyResultEvent evt = new UnifyResultEvent(newResult);
+		
+		for (UnifyResultListener listener : listeners) {
+			listener.onNewTypeResultFound(evt);
+		}
+	}
+}