package xuml.tools.model.compiler.runtime;
   
   import java.io.ByteArrayInputStream;
   import java.io.ByteArrayOutputStream;
   
   import org.objenesis.strategy.StdInstantiatorStrategy;
   
   import com.esotericsoftware.kryo.Kryo;
   import com.esotericsoftware.kryo.io.Input;
  import com.esotericsoftware.kryo.io.Output;
  import com.esotericsoftware.kryo.util.DefaultInstantiatorStrategy;
  import com.esotericsoftware.kryo.util.Pool;
  
  public class Util {
  
      private static final Pool<Kryo> pool = createKryoPool();
  
      public static byte[] toBytes(Object object) {
          if (object == null)
              return new byte[] {};
          Kryo kryo = pool.obtain();
          try {
              ByteArrayOutputStream bytes = new ByteArrayOutputStream();
              Output output = new Output(bytes);
              try {
                  kryo.writeObject(output, object);
              } finally {
                  output.close();
              }
              return bytes.toByteArray();
          } finally {
              pool.free(kryo);
          }
      }
  
      public static <T> T toObject(byte[] bytes, Class<T> cls) {
          if (bytes.length == 0)
              return null;
          ByteArrayInputStream in = new ByteArrayInputStream(bytes);
          Kryo kryo = pool.obtain();
          try {
              Input input = new Input(in);
              try {
                  return kryo.readObject(input, cls);
              } finally {
                  input.close();
              }
          } finally {
              pool.free(kryo);
          }
      }
  
      private static Pool<Kryo> createKryoPool() {
          return  new Pool<Kryo>(true, true, 8) {
              @Override
              public Kryo create() {
                  Kryo kryo = new Kryo();
                  kryo.setRegistrationRequired(false);
                  kryo.setInstantiatorStrategy(
                          new DefaultInstantiatorStrategy(new StdInstantiatorStrategy()));
                  // configure kryo instance, customize settings
                  return kryo;
              }
          };
      }
  
  }