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C++ client

An example is given in HxSamples/ConsDemo/clientDemoImageOps.c.

C++ client application structure

Basically, a client takes the following steps:

• Instantiate a HxCorbaMediator (usually HxDefaultCorbaMediator) to facilitate the connection to Corba.
• Obtain an initial object (a stub) from the server such as HxCorba::Constructor and HxCorba::GlobalOps.
• Apply functions to Corba objects obtained from calls to the initial objects and previous calls to other Corba objects.

In a normal client-server configuration, any call to a member function of a stub results (in the end) in a call to a servant member function. The <<Corba call>> in the figure is then done via IIOP. However, if the client use the "-createServer" option (see below), the server runs in the same process as the client and the <<Corba call>> is a normal virtual function call.

To indicate the Horus server we want to be a client of there are some command line arguments (handled by HxDefaultCorbaMediator in C++):

-useServer name

connect to the server registered in the NameService under "HxCorba/Servers"

-useServerRef ior

connect to the server designated by the given ior, e.g. a corbaloc

-createServer

start a new server within the client process

For example, to have the client call the Horus server that is running on the machine Mach2 at port 8010 use:

clientDemoImageOps -useServerRef corbaloc::Mach2:8010/Constructor

To use the Horus server that is registered in the Naming Service under the name TheServer:

clientDemoImageOps -useServer TheServer

The Corba version of the shot detection program (clientShotDetection) is an example of a client that communicates with two Corba servers : a Horus server to do the processing and an OracleServer to store the results in the Oracle database. To use the Horus server running on the localhost at port 8888 as well as the OracleServer running on carol at port 9999 use:

clientShotDetection -useServerRef corbaloc::localhost:8888/Constructor \
                    -ORBservice Database corbaloc::carol:9999/Oracle

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