DataStore myDataStore = ...;
   // use datastore
   ...
   myDataStore = null;
   System.gc(); System.gc(); System.gc(); // clean up pretty please!!!

public interface DataStore {
  ...
  /**
   * Releases all resources eventually held by this DataStore. The DataStore and all objects
   * generated out of it are not supposed to be working anymore after this method is called. 
   * This call provides no thread safety guarantees, making sure nothing else goes on while
   * closing the datastore is a responsibility of the client code.
   * Subsequent calls to this method will be treated as no-ops.
   */
  public void dispose();
}

DataStore myDataStore = null;
   try {
      myDataStore = ...;
      // use data store
      ...
   } finally {
     if(myDataStore != null) 
       myDataStore.dipose();
   }