/**
  * Add class to watched classes for auditing Not thread safe. Call this method once during app
  * initialization
  *
  * @param auditClass
  */
 public void auditClass(Class auditClass) {
   MappedClass mappedClass = mongo.getMorphia().getMapper().getMappedClass(auditClass);
   if (mappedClass != null) {
     watchedClasses.put(auditClass, mappedClass.getCollectionName() + "History");
   }
 }