code: @Override
      public GetEventSourceMappingResult getEventSourceMapping(GetEventSourceMappingRequest request) {
          request = beforeClientExecution(request);
          return executeGetEventSourceMapping(request);
      }
docs: <p>
  Returns details about an event source mapping. You can get the identifier of a mapping from the output of
  <a>ListEventSourceMappings</a>.
  </p>
  
  @param getEventSourceMappingRequest
  @return Result of the GetEventSourceMapping operation returned by the service.
  @throws ServiceException
  The AWS Lambda service encountered an internal error.
  @throws ResourceNotFoundException
  The resource (for example, a Lambda function or access policy statement) specified in the request does
  not exist.
  @throws InvalidParameterValueException
  One of the parameters in the request is invalid. For example, if you provided an IAM role for AWS Lambda
  to assume in the <code>CreateFunction</code> or the <code>UpdateFunctionConfiguration</code> API, that
  AWS Lambda is unable to assume you will get this exception.
  @throws TooManyRequestsException
  Request throughput limit exceeded.
  @sample AWSLambda.GetEventSourceMapping
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/lambda-2015-03-31/GetEventSourceMapping" target="_top">AWS
  API Documentation</a>