code: @Override
      public DescribeVirtualInterfacesResult describeVirtualInterfaces(DescribeVirtualInterfacesRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeVirtualInterfaces(request);
      }
docs: <p>
  Displays all virtual interfaces for an AWS account. Virtual interfaces deleted fewer than 15 minutes before you
  make the request are also returned. If you specify a connection ID, only the virtual interfaces associated with
  the connection are returned. If you specify a virtual interface ID, then only a single virtual interface is
  returned.
  </p>
  <p>
  A virtual interface (VLAN) transmits the traffic between the AWS Direct Connect location and the customer
  network.
  </p>
  
  @param describeVirtualInterfacesRequest
  @return Result of the DescribeVirtualInterfaces operation returned by the service.
  @throws DirectConnectServerException
  A server-side error occurred.
  @throws DirectConnectClientException
  One or more parameters are not valid.
  @sample AmazonDirectConnect.DescribeVirtualInterfaces
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/directconnect-2012-10-25/DescribeVirtualInterfaces"
  target="_top">AWS API Documentation</a>