added class for thread safe writing in logfiles

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

@@ -0,0 +1,24 @@
+package de.dhbwstuttgart.typeinference.unify;
+
+import java.io.IOException;
+import java.io.Writer;
+import java.util.concurrent.ForkJoinPool;
+
+public class WriterActiveObject {
+    private Writer writer;
+    private ForkJoinPool pool = new ForkJoinPool(1, ForkJoinPool.defaultForkJoinWorkerThreadFactory, null, true);
+
+    public WriterActiveObject(Writer writer){
+        this.writer = writer;
+    }
+
+    public void write(String message){
+        pool.execute(()->{
+            try {
+                writer.write(message);
+            } catch (IOException e) {
+                System.out.println(e.getMessage());
+            }
+        });
+    }
+}