reworked tests with UnifyTaskModelParallel

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

@@ -28,9 +28,10 @@ public class TypeUnify {
 	 * @param cons
 	 * @return
 	 */
-	public Set<Set<UnifyPair>> unify(Set<UnifyPair> undConstrains, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, Writer logFile, Boolean log, UnifyResultModel ret, UnifyTaskModel usedTasks) {
-		TypeUnifyTask unifyTask = new TypeUnifyTask(undConstrains, oderConstraints, fc, true, logFile, log, 0, ret, usedTasks);
-		ForkJoinPool pool = new ForkJoinPool();
+	public Set<Set<UnifyPair>> unify(Set<UnifyPair> undConstrains, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, Writer logFile, Boolean log, UnifyResultModel ret, UnifyTaskModelParallel usedTasks) {
+		ForkJoinPool pool = new ForkJoinPool(Runtime.getRuntime().availableProcessors(), ForkJoinPool.defaultForkJoinWorkerThreadFactory, null, true);
+		usedTasks.setPool(pool);
+		TypeUnifyTask unifyTask = new TypeUnifyTask(undConstrains, oderConstraints, fc, true, logFile, log, 0, ret);
 		pool.invoke(unifyTask);
 		Set<Set<UnifyPair>> res =  unifyTask.join();
 		try {
@@ -54,9 +55,10 @@ public class TypeUnify {
 	 * @param ret
 	 * @return
 	 */
-	public UnifyResultModel unifyAsync(Set<UnifyPair> undConstrains, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, Writer logFile, Boolean log, UnifyResultModel ret, UnifyTaskModel usedTasks) {
-		TypeUnifyTask unifyTask = new TypeUnifyTask(undConstrains, oderConstraints, fc, true, logFile, log, 0, ret, usedTasks);
-		ForkJoinPool pool = new ForkJoinPool();
+	public UnifyResultModel unifyAsync(Set<UnifyPair> undConstrains, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, Writer logFile, Boolean log, UnifyResultModel ret, UnifyTaskModelParallel usedTasks) {
+		ForkJoinPool pool = new ForkJoinPool(Runtime.getRuntime().availableProcessors(), ForkJoinPool.defaultForkJoinWorkerThreadFactory, null, true);
+		usedTasks.setPool(pool);
+		TypeUnifyTask unifyTask = new TypeUnifyTask(undConstrains, oderConstraints, fc, true, logFile, log, 0, ret);
 		pool.invoke(unifyTask);
 		return ret;
 	}
@@ -72,10 +74,11 @@ public class TypeUnify {
 	 * @param ret
 	 * @return
 	 */
-	public UnifyResultModel unifyParallel(Set<UnifyPair> undConstrains, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, Writer logFile, Boolean log, UnifyResultModel ret, UnifyTaskModel usedTasks) {
+	public UnifyResultModel unifyParallel(Set<UnifyPair> undConstrains, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, Writer logFile, Boolean log, UnifyResultModel ret, UnifyTaskModelParallel usedTasks) {
+		ForkJoinPool pool = new ForkJoinPool(Runtime.getRuntime().availableProcessors(), ForkJoinPool.defaultForkJoinWorkerThreadFactory, null, true);
+		usedTasks.setPool(pool);
 		TypeUnifyTask unifyTask = //new TypeUnifyTask(undConstrains, oderConstraints, fc, true, logFile, log, 0, ret, usedTasks);
-				new TypeUnifyTask(undConstrains, oderConstraints, fc, true, logFile, log, 0, ret, usedTasks, statistics);
-		ForkJoinPool pool = new ForkJoinPool();
+				new TypeUnifyTask(undConstrains, oderConstraints, fc, true, logFile, log, 0, ret, statistics);
 		pool.invoke(unifyTask);
 		Set<Set<UnifyPair>> res =  unifyTask.join();
 		try {
@@ -108,8 +111,8 @@ public class TypeUnify {
 	 * @param cons
 	 * @return
 	 */
-	public Set<Set<UnifyPair>> unifyOderConstraints(Set<UnifyPair> undConstrains, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, Writer logFile, Boolean log, UnifyResultModel ret, UnifyTaskModel usedTasks) {
-		TypeUnifyTask unifyTask = new TypeUnifyTask(undConstrains, oderConstraints, fc, false, logFile, log, 0, ret, usedTasks);
+	public Set<Set<UnifyPair>> unifyOderConstraints(Set<UnifyPair> undConstrains, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, Writer logFile, Boolean log, UnifyResultModel ret, UnifyTaskModelParallel usedTasks) {
+		TypeUnifyTask unifyTask = new TypeUnifyTask(undConstrains, oderConstraints, fc, false, logFile, log, 0, ret);
 		unifyTask.statistics = statistics;
 		Set<Set<UnifyPair>> res = unifyTask.compute();
 		try {

src/main/java/de/dhbwstuttgart/typeinference/unify/TypeUnify2Task.java

@@ -23,14 +23,14 @@ public class TypeUnify2Task extends TypeUnifyTask {
        TypeUnify2Task(Set<Set<UnifyPair>> setToFlatten, Set<UnifyPair> eq, 
     		   List<Set<Constraint<UnifyPair>>> oderConstraints, 
     		   Set<UnifyPair> nextSetElement, 
-    		   IFiniteClosure fc, boolean parallel, Writer logFile, Boolean log, int rekTiefe, UnifyResultModel urm, UnifyTaskModel usedTasks, 
+    		   IFiniteClosure fc, boolean parallel, Writer logFile, Boolean log, int rekTiefe, UnifyResultModel urm,
     		   Set<UnifyPair> methodSignatureConstraintUebergabe, Writer statistics) {
-    	   this(setToFlatten, eq, oderConstraints, nextSetElement, fc, parallel, logFile, log, rekTiefe, urm, usedTasks, methodSignatureConstraintUebergabe );
+    	   this(setToFlatten, eq, oderConstraints, nextSetElement, fc, parallel, logFile, log, rekTiefe, urm, methodSignatureConstraintUebergabe );
     	   
        }
        
-       public TypeUnify2Task(Set<Set<UnifyPair>> setToFlatten, Set<UnifyPair> eq, List<Set<Constraint<UnifyPair>>> oderConstraints, Set<UnifyPair> nextSetElement, IFiniteClosure fc, boolean parallel, Writer logFile, Boolean log, int rekTiefe, UnifyResultModel urm, UnifyTaskModel usedTasks, Set<UnifyPair> methodSignatureConstraintUebergabe) {
-               super(eq, oderConstraints, fc, parallel, logFile, log, rekTiefe, urm, usedTasks);
+       public TypeUnify2Task(Set<Set<UnifyPair>> setToFlatten, Set<UnifyPair> eq, List<Set<Constraint<UnifyPair>>> oderConstraints, Set<UnifyPair> nextSetElement, IFiniteClosure fc, boolean parallel, Writer logFile, Boolean log, int rekTiefe, UnifyResultModel urm, Set<UnifyPair> methodSignatureConstraintUebergabe) {
+               super(eq, oderConstraints, fc, parallel, logFile, log, rekTiefe, urm);
                this.setToFlatten = setToFlatten;
                this.nextSetElement = nextSetElement;
                this.methodSignatureConstraintUebergabe = methodSignatureConstraintUebergabe;
@@ -53,14 +53,7 @@ public class TypeUnify2Task extends TypeUnifyTask {
                */ 
                //writeLog("xxx");
                //noOfThread--;
-               synchronized (usedTasks) {
-            	   if (this.myIsCancelled()) {
-   						return new HashSet<>();
-   					}
-   					else {
-   						return res;
-   					}
-   				}
+               return res;
        	}
        
        public void closeLogFile() {

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

@@ -74,11 +74,9 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 	 * Fuer die Threads
 	 */
 	UnifyResultModel urm;
-	protected static int noOfThread = 0;
 	private static int totalnoOfThread = 0;
 	int thNo;
 	protected boolean one = false;
-	Integer MaxNoOfThreads = 128;
 
 	public static final String rootDirectory = System.getProperty("user.dir")+"/test/logFiles/";
 	Writer logFile;
@@ -127,10 +125,6 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 	
 	static Integer  noShortendElements = 0;
 	
-	Boolean myIsCanceled = false;
-	
-	volatile UnifyTaskModel usedTasks;
-	
 	static Writer statistics;
 	
 	public TypeUnifyTask() { 
@@ -152,11 +146,11 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 	*/
 	
 	//statistics
-	public TypeUnifyTask(Set<UnifyPair> eq, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, boolean parallel, Writer logFile, Boolean log, int rekTiefe, UnifyResultModel urm, UnifyTaskModel usedTasks, Writer statistics) {
-		this(eq,oderConstraints,  fc,  parallel,  logFile,  log,  rekTiefe,  urm,  usedTasks);
+	public TypeUnifyTask(Set<UnifyPair> eq, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, boolean parallel, Writer logFile, Boolean log, int rekTiefe, UnifyResultModel urm, Writer statistics) {
+		this(eq,oderConstraints,  fc,  parallel,  logFile,  log,  rekTiefe,  urm);
 		this.statistics = statistics;
 	}
-	public TypeUnifyTask(Set<UnifyPair> eq, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, boolean parallel, Writer logFile, Boolean log, int rekTiefe, UnifyResultModel urm, UnifyTaskModel usedTasks) {
+	public TypeUnifyTask(Set<UnifyPair> eq, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, boolean parallel, Writer logFile, Boolean log, int rekTiefe, UnifyResultModel urm) {
 		synchronized (this) {
             if(statistics==null){
                 statistics = new NullWriter();
@@ -179,8 +173,7 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 			this.parallel = parallel;
 			this.logFile = logFile;
 			this.log = log;
-			
-			noOfThread++; 
+
 			totalnoOfThread++;
 			//writeLog("thNo1 " + thNo);
 			thNo = totalnoOfThread;
@@ -210,8 +203,6 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 			rules = new RuleSet(logFile);
 			this.rekTiefeField = rekTiefe;
 			this.urm = urm;
-			this.usedTasks = usedTasks;
-			this.usedTasks.add(this);
 		}
 	}
 	
@@ -247,13 +238,6 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 		}		
 }
 */
-	void myCancel(Boolean b) {
-		myIsCanceled = true;
-	}
-	
-	public boolean myIsCancelled() {
-		return myIsCanceled;
-	}
 	
 	protected Set<Set<UnifyPair>> compute() {
 		if (one) {
@@ -269,7 +253,6 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 				.filter(x -> x.size()>1)
 				.collect(Collectors.toCollection(ArrayList::new));
 		Set<Set<UnifyPair>> res = unify(neweq, remainingOderconstraints, fc, parallel, rekTiefeField, new HashSet<>());
-		noOfThread--;
 		try {
 			logFile.close();
 		}
@@ -283,14 +266,7 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 				throw new DebugException("Unresolved constraints: " + res.toString()); //return new HashSet<>();
 			}
 		else {
-			synchronized (usedTasks) {
-				if (this.myIsCancelled()) {
-					return new HashSet<>();
-				}
-				else {
-					return res;
-				}
-			}
+			return res;
 		}
 	}
 /*	
@@ -323,12 +299,6 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 
                 //.collect(Collectors.toCollection(HashSet::new)));
 		
-		synchronized (usedTasks) {
-			if (this.myIsCancelled()) {
-				return new HashSet<>();
-			}
-		}
-		
 		rekTiefe++;
 		nOfUnify++;
         writeLog(nOfUnify.toString() + " Unifikation: " + eq.toString());
@@ -510,12 +480,6 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 		//		.collect(Collectors.toCollection(HashSet::new));
 		//Muss auskommentiert werden, wenn computeCartesianRecursive ENDE
 		
-		synchronized (usedTasks) {
-			if (this.myIsCancelled()) {
-				return new HashSet<>();
-			}
-		}
-		
 		Set<Set<UnifyPair>> eqPrimePrimeSet = new HashSet<>();
 		
 		Set<TypeUnifyTask> forks = new HashSet<>();
@@ -823,7 +787,7 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 				Set<Set<UnifyPair>> newElemsOrig = new HashSet<>(elems);
 				List<Set<Constraint<UnifyPair>>> newOderConstraintsOrig = new ArrayList<>(oderConstraints);
 				newElemsOrig.add(a);
-				TypeUnify2Task forkOrig = new TypeUnify2Task(newElemsOrig, newEqOrig, newOderConstraintsOrig, a, fc, parallel, logFile, log, rekTiefe, urm, usedTasks, methodSignatureConstraint);
+				TypeUnify2Task forkOrig = new TypeUnify2Task(newElemsOrig, newEqOrig, newOderConstraintsOrig, a, fc, parallel, logFile, log, rekTiefe, urm, methodSignatureConstraint);
 				//Überprüfen, ob das Set bereits berechnet wurde
 				forkOrig.fork();
 
@@ -838,7 +802,7 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 					Set<Set<UnifyPair>> newElems = new HashSet<>(elems);
 					List<Set<Constraint<UnifyPair>>> newOderConstraints = new ArrayList<>(oderConstraints);
 					newElems.add(nSaL);
-					TypeUnify2Task fork = new TypeUnify2Task(newElems, newEq, newOderConstraints, nSaL, fc, parallel, logFile, log, rekTiefe, urm, usedTasks, new HashSet<>(methodSignatureConstraint));
+					TypeUnify2Task fork = new TypeUnify2Task(newElems, newEq, newOderConstraints, nSaL, fc, parallel, logFile, log, rekTiefe, urm, new HashSet<>(methodSignatureConstraint));
 					forks.add(fork);
 					//Überprüfen, ob das Set bereits berechnet wurde
 					fork.fork();
@@ -2262,7 +2226,6 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 		if (log && finalresult) {
 			try {
 				logFile.write("Thread no.:" + thNo + "\n");
-				logFile.write("noOfThread:" + noOfThread + "\n");
 				logFile.write("parallel:" + parallel + "\n");
 				logFile.write(str+"\n\n");
 				logFile.flush();

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

@@ -1,18 +0,0 @@
-package de.dhbwstuttgart.typeinference.unify;
-
-import java.util.ArrayList;
-
-public class UnifyTaskModel {
-
-	ArrayList<TypeUnifyTask> usedTasks = new ArrayList<>();
-	
-	public synchronized void add(TypeUnifyTask t) {
-		usedTasks.add(t);
-	}
-    
-    public synchronized void cancel() {
-    	for(TypeUnifyTask t : usedTasks) {
-    		t.myCancel(true);
-    	}
-    }
-}

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

@@ -0,0 +1,18 @@
+package de.dhbwstuttgart.typeinference.unify;
+
+
+import java.util.concurrent.ForkJoinPool;
+
+public class UnifyTaskModelParallel {
+    private ForkJoinPool pool;
+
+    public void setPool(ForkJoinPool pool){
+        this.pool = pool;
+    }
+
+    public void cancel(){
+        if(this.pool != null){
+            this.pool.shutdown();
+        }
+    }
+}

src/main/java/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java

@@ -1,13 +1,10 @@
 package de.dhbwstuttgart.typeinference.unify.model;
 
-import java.io.File;
-import java.io.FileWriter;
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.HashMap;
-import java.util.HashSet;
 import java.util.Random;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 
 import de.dhbwstuttgart.typeinference.unify.distributeVariance;
 import de.dhbwstuttgart.typeinference.unify.interfaces.IFiniteClosure;
@@ -23,7 +20,7 @@ public final class PlaceholderType extends UnifyType{
 	 * Static list containing the names of all existing placeholders.
 	 * Used for generating fresh placeholders.
 	 */
-	public static final ArrayList<String> EXISTING_PLACEHOLDERS = new ArrayList<String>();
+	public static final Set<String> EXISTING_PLACEHOLDERS = ConcurrentHashMap.newKeySet();
 	
 	/**
 	 * Prefix of auto-generated placeholder names.
@@ -96,7 +93,7 @@ public final class PlaceholderType extends UnifyType{
 	 * A user could later instantiate a type using the same name that is equivalent to this type.
 	 * @return A fresh placeholder type.
 	 */
-	public synchronized static PlaceholderType freshPlaceholder() {
+	public static PlaceholderType freshPlaceholder() {
 		String name = nextName + (char) (rnd.nextInt(22) + 97); // Returns random char between 'a' and 'z'
 		// Add random chars while the name is in use.
 		while(EXISTING_PLACEHOLDERS.contains(name)) {

src/test/java/UnifyTest.java

@@ -3,7 +3,7 @@ import de.dhbwstuttgart.typeinference.constraints.ConstraintSet;
 import de.dhbwstuttgart.typeinference.constraints.Pair;
 import de.dhbwstuttgart.typeinference.unify.TypeUnify;
 import de.dhbwstuttgart.typeinference.unify.UnifyResultModel;
-import de.dhbwstuttgart.typeinference.unify.UnifyTaskModel;
+import de.dhbwstuttgart.typeinference.unify.UnifyTaskModelParallel;
 import de.dhbwstuttgart.typeinference.unify.interfaces.IFiniteClosure;
 import de.dhbwstuttgart.typeinference.unify.model.*;
 import org.apache.commons.io.output.NullWriter;
@@ -77,9 +77,605 @@ public class UnifyTest {
         TypeUnify unifyAlgo = new TypeUnify();
         ConstraintSet<Pair> cons = new ConstraintSet<>();
         UnifyResultModel urm = new UnifyResultModel(cons, finiteClosure);
-        UnifyTaskModel tasks = new UnifyTaskModel();
+        UnifyTaskModelParallel tasks = new UnifyTaskModelParallel();
         Set<Set<UnifyPair>> solution = unifyAlgo.unify(undConstraints, oderConstraints, finiteClosure, new NullWriter(), false, urm, tasks);
         System.out.println(solution.size());
         //System.out.println(solution);
-    }}
+    }
+
+    @Test
+    public void basicMatrixTest(){
+        UnifyType type1;
+        UnifyType type2;
+        Set<UnifyPair> undConstraints = new HashSet<>();
+
+        //und-constraints
+        //Matrix <. ret
+        type1 = new ReferenceType("Matrix");
+        type2 = new PlaceholderType("ret");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //Integer <. i
+        type1 = new ReferenceType("Integer");
+        type2 = new PlaceholderType("i");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //Matrix <. Vector<x?>
+        type1 = new ReferenceType("Matrix");
+        type2 = new ReferenceType("Vector", new TypeParams(new PlaceholderType("x")));
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //x? <. v1
+        type1 = new PlaceholderType("x");
+        type2 = new PlaceholderType("v1");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //i <. Integer
+        type1 = new PlaceholderType("i");
+        type2 = new ReferenceType("Integer");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //Vector<Integer> <. v2
+        type1 = new ReferenceType("Vector", new TypeParams(new ReferenceType("Integer")));
+        type2 = new PlaceholderType("v2");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //v1 <. Vector<y?>
+        type1 = new PlaceholderType("v1");
+        type2 = new ReferenceType("Vector", new TypeParams(new PlaceholderType("y")));
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //m <. Vector<z?>
+        type1 = new PlaceholderType("m");
+        type2 = new ReferenceType("Vector", new TypeParams(new PlaceholderType("z")));
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //z? <. zr
+        type1 = new PlaceholderType("z");
+        type2 = new PlaceholderType("zr");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //zr <. Vector<z2?>
+        type1 = new PlaceholderType("zr");
+        type2 = new ReferenceType("Vector", new TypeParams(new PlaceholderType("z2")));
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //z2? <. z2r
+        type1 = new PlaceholderType("z2");
+        type2 = new PlaceholderType("z2r");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //z2r <. Integer
+        type1 = new PlaceholderType("z2r");
+        type2 = new ReferenceType("Integer");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //v1 <. Vector<y2?>
+        type1 = new PlaceholderType("v1");
+        type2 = new ReferenceType("Vector", new TypeParams(new PlaceholderType("y2")));
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //y2? <. y2r
+        type1 = new PlaceholderType("y2");
+        type2 = new PlaceholderType("y2r");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //y2r <. Integer
+        type1 = new PlaceholderType("y2r");
+        type2 = new ReferenceType("Integer");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //v2 <. Vector<x3?>
+        type1 = new PlaceholderType("v2");
+        type2 = new ReferenceType("Vector", new TypeParams(new PlaceholderType("x3")));
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //x3? <. x3r
+        type1 = new PlaceholderType("x3");
+        type2 = new PlaceholderType("x3r");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //Integer <. x3r
+        type1 = new ReferenceType("Integer");
+        type2 = new PlaceholderType("x3r");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //ret <. Vector<x2?>
+        type1 = new PlaceholderType("ret");
+        type2 = new ReferenceType("Vector", new TypeParams(new PlaceholderType("x2")));
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //x2? <. x2r
+        type1 = new PlaceholderType("x2");
+        type2 = new PlaceholderType("x2r");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //v2 <. x2r
+        type1 = new PlaceholderType("v2");
+        type2 = new PlaceholderType("x2r");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+
+        //oder-constraints
+        List<Set<Constraint<UnifyPair>>> oderConstraints = new ArrayList<>();
+
+        //FiniteClosure
+        Set<UnifyPair> constraints = new HashSet<>();
+        //Matrix extends Vector<Vector<Integer>>
+        type1 = new ReferenceType("Matrix");
+        type2 = new ReferenceType("Vector", new TypeParams(new ReferenceType("Vector", new TypeParams(new ReferenceType("Integer")))));
+        constraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //Vector<X> extends Object
+        type1 = new ReferenceType("Vector", new TypeParams(new ReferenceType("X")));
+        type2 = new ReferenceType("Object");
+        constraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //Integer extends Object
+        type1 = new ReferenceType("Integer");
+        type2 = new ReferenceType("Object");
+        constraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        FiniteClosure finiteClosure = new FiniteClosure(constraints, new NullWriter());
+
+        TypeUnify unifyAlgo = new TypeUnify();
+        ConstraintSet< Pair> cons = new ConstraintSet<>();
+        UnifyResultModel urm = new UnifyResultModel(cons, finiteClosure);
+        UnifyTaskModelParallel tasks = new UnifyTaskModelParallel();
+        Set<Set<UnifyPair>> solution = unifyAlgo.unify(undConstraints, oderConstraints, finiteClosure, new NullWriter(), false, urm, tasks);
+        System.out.println(solution.size());
+    }
+
+    @Test
+    public void scalark2(){
+        UnifyType type1;
+        UnifyType type2;
+
+        //und-constraints
+        Set<UnifyPair> undConstraints = new HashSet<>();
+        //H =. Scalar
+        type1 = new PlaceholderType("H");
+        type2 = new ReferenceType("Scalar");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //E <!=. java.lang.Number
+        type1 = new PlaceholderType("E");
+        type2 = new ReferenceType("java.lang.Number");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERNEQDOT));
+        //C =. A
+        type1 = new PlaceholderType("H");
+        type2 = new PlaceholderType("A");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //L =. Scalar
+        type1 = new PlaceholderType("L");
+        type2 = new ReferenceType("Scalar");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //D <. C
+        type1 = new PlaceholderType("D");
+        type2 = new PlaceholderType("C");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //java.lang.Boolean =. G
+        type1 = new ReferenceType("java.lang.Boolean");
+        type2 = new PlaceholderType("G");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //G =. java.lang.Boolean
+        type1 = new PlaceholderType("G");
+        type2 = new ReferenceType("java.lang.Boolean");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //V <. C
+        type1 = new PlaceholderType("V");
+        type2 = new PlaceholderType("C");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //F <. E
+        type1 = new PlaceholderType("F");
+        type2 = new PlaceholderType("E");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //X <. E
+        type1 = new PlaceholderType("X");
+        type2 = new PlaceholderType("E");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //J <!=. java.lang.Number
+        type1 = new PlaceholderType("J");
+        type2 = new ReferenceType("java.lang.Number");
+        undConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLERNEQDOT));
+
+        //oder-constraints
+        List<Set<Constraint<UnifyPair>>> oderConstraints = new ArrayList<>();
+        Set<Constraint<UnifyPair>> constraints = new HashSet<>();
+        Constraint<UnifyPair> constraint = new Constraint<>();
+
+        //set #1
+        //D =. java.lang.Float
+        type1 = new PlaceholderType("D");
+        type2 = new ReferenceType("java.lang.Boolean");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        //D =. java.lang.Integer
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("D");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        oderConstraints.add(constraints);
+
+        //set #2
+        constraints = new HashSet<>();
+        //F =. java.lang.Integer
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("F");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        //F =. java.lang.Float
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("F");
+        type2 = new ReferenceType("java.lang.Float");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        oderConstraints.add(constraints);
+
+        //set #3
+        constraints = new HashSet<>();
+        //H =. ? extends Scalar
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("H");
+        type2 = new ExtendsType(new ReferenceType("Scalar"));
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //java.lang.Integer =. J
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new PlaceholderType("J");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        //H =. Vector<AJP>
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("H");
+        type2 = new ReferenceType("Vector", new TypeParams(new PlaceholderType("AJP")));
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //java.lang.Integer =. J
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new PlaceholderType("J");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        //H =. ? extends Vector<AJP>
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("H");
+        type2 = new ExtendsType(new ReferenceType("Vector", new TypeParams(new PlaceholderType("AJP"))));
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //java.lang.Integer =. J
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new PlaceholderType("J");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        //H =. Scalar
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("H");
+        type2 = new ReferenceType("Scalar");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //java.lang.Integer =. J
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new PlaceholderType("J");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        oderConstraints.add(constraints);
+
+        //set #4
+        constraints = new HashSet<>();
+        //java.lang.Integer =. O
+        constraint = new Constraint<>();
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new PlaceholderType("O");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //L =. Scalar
+        type1 = new PlaceholderType("L");
+        type2 = new ReferenceType("Scalar");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //E <. java.lang.Integer
+        type1 = new PlaceholderType("E");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        constraints.add(constraint);
+        //E <. java.lang.Integer
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("E");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //L =. ? extends Vector<AJQ>
+        type1 = new PlaceholderType("L");
+        type2 = new ExtendsType(new ReferenceType("Vector", new TypeParams(new PlaceholderType("AJQ"))));
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //AJQ =. O
+        type1 = new PlaceholderType("AJQ");
+        type2 = new PlaceholderType("O");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        //java.lang.Integer =. O
+        constraint = new Constraint<>();
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new PlaceholderType("O");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //E <. java.lang.Integer
+        type1 = new PlaceholderType("E");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //L =. ? extends Scalar
+        type1 = new PlaceholderType("L");
+        type2 = new ExtendsType(new ReferenceType("Scalar"));
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        //L =. Vector<AJQ>
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("L");
+        type2 = new ReferenceType("Vector", new TypeParams(new PlaceholderType("AJQ")));
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //E <. java.lang.Integer
+        type1 = new PlaceholderType("E");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //AJQ =. O
+        type1 = new PlaceholderType("AJQ");
+        type2 = new PlaceholderType("O");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        oderConstraints.add(constraints);
+
+        //set #5
+        constraints = new HashSet<>();
+        //AJR =. S
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("AJR");
+        type2 = new PlaceholderType("S");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //E <. java.lang.Integer
+        type1 = new PlaceholderType("E");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //B =. Vector<AJR>
+        type1 = new PlaceholderType("B");
+        type2 = new ReferenceType("Vector", new TypeParams(new PlaceholderType("AJR")));
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        //java.lang.Integer =. S
+        constraint = new Constraint<>();
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new PlaceholderType("S");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //E <. java.lang.Integer
+        type1 = new PlaceholderType("E");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //B =. Scalar
+        type1 = new PlaceholderType("B");
+        type2 = new ReferenceType("Scalar");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        //java.lang.Integer =. S
+        constraint = new Constraint<>();
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new PlaceholderType("S");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //B =. ? extends Scalar
+        type1 = new PlaceholderType("B");
+        type2 = new ExtendsType(new ReferenceType("Scalar"));
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //E <. java.lang.Integer
+        type1 = new PlaceholderType("E");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        constraints.add(constraint);
+        //AJR =. S
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("AJR");
+        type2 = new PlaceholderType("S");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //B =. ? extends Vector<AJR>
+        type1 = new PlaceholderType("B");
+        type2 = new ExtendsType(new ReferenceType("Vector", new TypeParams(new PlaceholderType("AJR"))));
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //E <. java.lang.Integer
+        type1 = new PlaceholderType("E");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        constraints.add(constraint);
+        oderConstraints.add(constraints);
+
+        //set #6
+        constraints = new HashSet<>();
+        //O <. java.lang.Float
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("O");
+        type2 = new ReferenceType("java.lang.Float");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //java.lang.Float =. U
+        type1 = new ReferenceType("java.lang.Float");
+        type2 = new PlaceholderType("U");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //S <. java.lang.Float
+        type1 = new PlaceholderType("S");
+        type2 = new ReferenceType("java.lang.Float");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        constraints.add(constraint);
+        //java.lang.Integer =. U
+        constraint = new Constraint<>();
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new PlaceholderType("U");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //S <. java.lang.Integer
+        type1 = new PlaceholderType("S");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //O <. java.lang.Integer
+        type1 = new PlaceholderType("O");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        constraints.add(constraint);
+        oderConstraints.add(constraints);
+
+        //set #7
+        constraints = new HashSet<>();
+        //java.lang.Integer =. V
+        constraint = new Constraint<>();
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new PlaceholderType("V");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //U <. java.lang.Integer
+        type1 = new PlaceholderType("U");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //C <. java.lang.Integer
+        type1 = new PlaceholderType("C");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        constraints.add(constraint);
+        //java.lang.Float =. V
+        constraint = new Constraint<>();
+        type1 = new ReferenceType("java.lang.Float");
+        type2 = new PlaceholderType("V");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //U <. java.lang.Float
+        type1 = new PlaceholderType("U");
+        type2 = new ReferenceType("java.lang.Float");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //C <. java.lang.Float
+        type1 = new PlaceholderType("C");
+        type2 = new ReferenceType("java.lang.Float");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        constraints.add(constraint);
+        oderConstraints.add(constraints);
+
+        //set #8
+        constraints = new HashSet<>();
+        //W =. java.lang.Float
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("W");
+        type2 = new ReferenceType("java.lang.Float");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        //W =. java.lang.Integer
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("W");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        constraints.add(constraint);
+        oderConstraints.add(constraints);
+
+        //set #9
+        constraints = new HashSet<>();
+        //W <. java.lang.Integer
+        constraint = new Constraint<>();
+        type1 = new PlaceholderType("W");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //E <. java.lang.Integer
+        type1 = new PlaceholderType("E");
+        type2 = new ReferenceType("java.lang.Integer");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //java.lang.Integer =. X
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new PlaceholderType("X");
+        constraints.add(constraint);
+        //java.lang.Float =. X
+        constraint = new Constraint<>();
+        type1 = new ReferenceType("java.lang.Float");
+        type2 = new PlaceholderType("X");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.EQUALSDOT));
+        //E <. java.lang.Float
+        type1 = new PlaceholderType("E");
+        type2 = new ReferenceType("java.lang.Float");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        //W <. java.lang.Float
+        type1 = new PlaceholderType("W");
+        type2 = new ReferenceType("java.lang.Float");
+        constraint.add(new UnifyPair(type1, type2, PairOperator.SMALLERDOT));
+        constraints.add(constraint);
+        oderConstraints.add(constraints);
+
+
+        //FiniteClosure
+        Set<UnifyPair> fcConstraints = new HashSet<>();
+        //java.lang.Number < java.lang.Object
+        type1 = new ReferenceType("java.lang.Number");
+        type2 = new ReferenceType("java.lang.Object");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Number < java.io.Serializable
+        type1 = new ReferenceType("java.lang.Number");
+        type2 = new ReferenceType("java.io.Serializable");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Float < java.lang.Number
+        type1 = new ReferenceType("java.lang.Float");
+        type2 = new ReferenceType("java.lang.Number");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Integer < java.lang.Number
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new ReferenceType("java.lang.Number");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Integer < java.lang.Object
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new ReferenceType("java.lang.Object");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Integer < java.lang.constant.Constable
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new ReferenceType("java.lang.constant.Constable");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Integer < java.io.Serializable
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new ReferenceType("java.io.Serializable");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Integer < java.lang.constant.ConstantDesc
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new ReferenceType("java.lang.constant.ConstantDesc");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Integer < java.lang.Comparable<java.lang.Integer>
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new ReferenceType("java.lang.Comparable", new TypeParams(new ReferenceType("java.lang.Integer")));
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Float < java.lang.Object
+        type1 = new ReferenceType("java.lang.Float");
+        type2 = new ReferenceType("java.lang.Object");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Float < java.lang.constant.Constable
+        type1 = new ReferenceType("java.lang.Float");
+        type2 = new ReferenceType("java.lang.constant.Constable");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Float < java.io.Serializable
+        type1 = new ReferenceType("java.lang.Float");
+        type2 = new ReferenceType("java.io.Serializable");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Float < java.lang.Comparable<java.lang.Float>
+        type1 = new ReferenceType("java.lang.Integer");
+        type2 = new ReferenceType("java.lang.Comparable", new TypeParams(new ReferenceType("java.lang.Float")));
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Float < java.lang.constant.ConstantDesc
+        type1 = new ReferenceType("java.lang.Float");
+        type2 = new ReferenceType("java.lang.constant.ConstantDesc");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //Scalar<EYW> < java.lang.Object
+        type1 = new ReferenceType("Scalar", new TypeParams(new PlaceholderType("EYW")));
+        type2 = new ReferenceType("java.lang.Object");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //Scalar<EYW> < Vector<java.lang.Integer>
+        type1 = new ReferenceType("Scalar", new TypeParams(new PlaceholderType("EYW")));
+        type2 = new ReferenceType("Vector", new TypeParams(new ReferenceType("java.lang.Integer")));
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Comparable<java.lang.Float> < java.lang.Object
+        type1 = new ReferenceType("java.lang.Comparable", new TypeParams(new ReferenceType("java.lang.Float")));
+        type2 = new ReferenceType("java.lang.Object");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //Vector<java.lang.Integer> < java.lang.Object
+        type1 = new ReferenceType("Vector", new TypeParams(new ReferenceType("java.lang.Integer")));
+        type2 = new ReferenceType("java.lang.Object");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //Scalar < Vector<java.lang.Integer>
+        type1 = new ReferenceType("Scalar");
+        type2 = new ReferenceType("Vector", new TypeParams(new ReferenceType("java.lang.Integer")));
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.constant.ConstantDesc < java.lang.Object
+        type1 = new ReferenceType("java.lang.constant.ConstantDesc");
+        type2 = new ReferenceType("java.lang.Object");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //Scalar < java.lang.Object
+        type1 = new ReferenceType("Scalar");
+        type2 = new ReferenceType("java.lang.Object");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.constant.Constable < java.lang.Object
+        type1 = new ReferenceType("java.lang.constant.Constable");
+        type2 = new ReferenceType("java.lang.Object");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //Vector<EWV> < java.lang.Object
+        type1 = new ReferenceType("Vector", new TypeParams(new PlaceholderType("EWV")));
+        type2 = new ReferenceType("java.lang.Object");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.io.Serializable < java.lang.Object
+        type1 = new ReferenceType("java.io.Serializable");
+        type2 = new ReferenceType("java.lang.Object");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+        //java.lang.Comparable<java.lang.Integer> < java.lang.Object
+        type1 = new ReferenceType("java.lang.Comparable", new TypeParams(new ReferenceType("java.lang.Integer")));
+        type2 = new ReferenceType("java.lang.Object");
+        fcConstraints.add(new UnifyPair(type1, type2, PairOperator.SMALLER));
+
+        FiniteClosure finiteClosure = new FiniteClosure(fcConstraints, new NullWriter());
+        TypeUnify unifyAlgo = new TypeUnify();
+        ConstraintSet< Pair> cons = new ConstraintSet<>();
+        UnifyResultModel urm = new UnifyResultModel(cons, finiteClosure);
+        UnifyTaskModelParallel tasks = new UnifyTaskModelParallel();
+        Set<Set<UnifyPair>> solution = unifyAlgo.unify(undConstraints, oderConstraints, finiteClosure, new NullWriter(), false, urm, tasks);
+        System.out.println(solution);
+        System.out.println(solution.size());
+    }
+}