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   package org.smartcomps.twister.engine;
   
   import org.smartcomps.twister.engine.priv.TwisterEngineImpl;
   
   /***
    * A factory to obtain a direct Twister Engine instance or an
    * asynchronous proxy to an engine instance.
    */
   public class TwisterEngineFactory {
  
      private static TwisterEngineImpl instance = null;
  
      public static TwisterEngine getEngine() {
          if (instance == null) {
              instance = new TwisterEngineImpl();
          }
          return instance;
      }
      
  }