code: @Override
      public GetGcmChannelResult getGcmChannel(GetGcmChannelRequest request) {
          request = beforeClientExecution(request);
          return executeGetGcmChannel(request);
      }
docs: Returns information about the GCM channel for an app.
  
  @param getGcmChannelRequest
  @return Result of the GetGcmChannel operation returned by the service.
  @throws BadRequestException
  400 response
  @throws InternalServerErrorException
  500 response
  @throws ForbiddenException
  403 response
  @throws NotFoundException
  404 response
  @throws MethodNotAllowedException
  405 response
  @throws TooManyRequestsException
  429 response
  @sample AmazonPinpoint.GetGcmChannel
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/pinpoint-2016-12-01/GetGcmChannel" target="_top">AWS API
  Documentation</a>