Data Transformation Engine Services Guide

Chapter 6 – Service Usage Scenarios

Client Specifies the Input Data, Output Data is Sent Back

In this scenario, the CORBA Client makes a request to the CORBA Server along with its own input

data. The CORBA Server executes a map, transforms the input data, and returns the transformed data

back to the client as a response.

The CORBA client request contains the map name and the data to be transformed. The map’s input card

1 shall be overridden. The NonStop

DTE, rather than reading the input according to the map settings,

gets the data from the CORBA Transformation Server. The NonStop

DTE transforms the data and

sends back the transformed data as a response message.

The following line shows the command to run the CORBA Client (dteorbclnt).

Note:

1) When running the scenario "dteorbclnt ContactToLabel.nsk "" 1", copy the file Contact.txt

from /usr/tandem/nsdte/examples/corba to /usr/tandem/nsdte/bin.

2) The NonStop DTE-CORBA Server and Command Server log all the error messages to the

file: /tmp/mercAbort.log if a directory "tmp" is not created under MERC_HOME_DIR.

The first argument

ContactToLabel.nsk is the name of the compiled map to be executed. The second

argument

myContact.txt is the file that contains the input data to be sent to the server. The last

argument

1 indicates that the output card #1 is overridden and the transformed data sent back to the

client.

In the NonStop DTE sample client C++ code, the CORBA Transformation Client makes the CORBA

transform() API call similarly to the following statements:

The first parameter argv[1]

contains the name of the map (ContactToLabel.nsk) from the command

line. The second parameter data

contains the data fetched from the input file (myContact.txt). The

third parameter atoi(argv[3])

is the output card number. The return value outData contains the

transformed data.

CORBA

Client

CORBA Server

Map

: dteorbclnt ContactToLabel.nsk myContact.txt 1

DTEORBServ_var lp_DTEORBServ_obj; …

ifstream iFile(argv[2], ios::in );

char *data = new char[bufferSize];

iFile >> data;

char *outData = lp_DTEORBServ_obj ->transform(argv[1], data,

atoi(argv[3]));