code: @Override
  	public Set<Class<?>> getServiceTransactionTypeSet(Class<?> rootType){
  		Map<Class<?>, List<Object>> map = mapBusinessProvider.get(rootType);
  		if(map != null){
  			return  Collections.unmodifiableSet(map.keySet());
  		}else{
  			return null;
  		}
  	}
docs: /* (non-Javadoc)
  @see com.yiqiniu.easytrans.register.ServiceRegister#getServiceTransactionTypeSet(java.lang.Class)