dramahello.cpp

/*                      D R A M A H E L L O 

 *  Module name:
      dramahello.cpp

 *  Function:
      DRAMA 2 Hello World.

 *  Description:
      Responds to the following commands
                HELLO   -  Outputs  message.
                EXIT     - Cause this task to exit.


 *  Language:
      C++

 * Copyright (c) Australian Astronomical Observatory, 2014.
   Not to be used for commercial purposes without permission.
   No warranty of any form unless subject to a specific agreement.


 *  Support: Tony Farrell, AAO

 
 *  @(#) $Id: ACMM:Drama2/examples/dramahello.cpp,v 1.45+ 22-Feb-2016 14:09:53+11 tjf $
 
  
 */

static const char *rcsId="@(#) $Id: ACMM:Drama2/examples/dramahello.cpp,v 1.45+ 22-Feb-2016 14:09:53+11 tjf $";
static void *use_rcsId = (0 ? (void *)(&use_rcsId) : (void *) &rcsId);

#include "drama.hh"

#include "drama/sds.hh"

class HelloAction : public drama::MessageHandler {
public:
    HelloAction() {}
    ~HelloAction() {}
private:

    drama::Request MessageReceived() {
        /*
         * Send a message to the user.  (Method of MessageHandler)
         */
        MessageUser("Hello World - from DRAMA 2");

        /*
         * Access any argument to this action.
         *    (GetEntry() is a method of MesageHandler.)
         */
        drama::sds::Id Arg = GetEntry().Argument();
        if (Arg) 
        {
            /*
             * Print the argument.
             */
            Arg.List(SdsListToUser());
            /*
             * If the message is in standard format, the name
             * of the first item will be Argument1.
             */ 
            std::string MyArgument;
            Arg.Get("Argument1", &MyArgument);
            MessageUser(MyArgument);
            
            /*
             * Alternatively, 
             */
            MessageUser(Arg.toString());
        }

        /*
         * Tell DRAMA the action has ended.
         */
        return  drama::RequestCode::End;
    } 
};



class DramaHello : public drama::Task {

private:
    HelloAction HelloActionObj;
    
public:

    DramaHello() : drama::Task("DRAMAHELLO") {

        Add("HELLO", drama::MessageHandlerPtr(&HelloActionObj, drama::nodel()));
        Add("EXIT", drama::SimpleExitAction);
    }
    ~DramaHello() {

    }
};

int main()
{
    try 
    {
        // Make this program a DRAMA task named ticker
        DramaHello task;
 
    
        // Process DRAMA messages.
        task.RunDrama();


    } 
    catch (drama::Exception &e) 
    {
        fprintf(stderr,"DRAMA Exception thrown and caught in main\n");
        fprintf(stderr,"%s\n", e.toString().c_str());
        fprintf(stderr,"DRAMA Status = 0X%lx, %s\n",
                static_cast<long int>(e.dramaStatus()), 
                e.dramaStatusStr().c_str());

        exit (e.statusAsSysExitCode());
    }

    return 0;
}