code: public ListenableFuture<ThriftConnection<T>> getAsyncConnection() {
  		return this.asyncExecutor.submit(new Callable<ThriftConnection<T>>() {
  
  			public ThriftConnection<T> call() throws Exception {
  				return getConnection();
  			}
  		});
  	}
docs: 异步获取连接的方法
  
  @return 连接代理对象