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/home/tetron/hack/vos/apps/tutorials/vostut5client.cc

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/* Fifth VOS tutorial.  Introduction to Metaobjects.

   This tutorial file covers:
   - Accessing remote metaobjects
   - The meta_cast<> template

   This file (vostut5client.cc) is released into the public domain.  No
   restrictions are placed on its use, distribution or inclusion into
   other works.
*/

// You must run this program after running vostut5server.

#include <vos/vos/vos.hh>

using namespace VUtil;
using namespace VOS;

void listTypes(Vobject* vob);

int main(int argc, char** argv)
{
    std::cout << "VOS Tutorial 5 Client\n\n";

    Site localsite;
    localsite.addSiteExtension(new LocalVipSiteExtension());

    std::string siteurl;
    if(argc > 1) siteurl = argv[1];
    else siteurl = "vip://localhost:4231";

    // The purpose of this client part of vostut5 is simply to
    // demonstrate that the use of meta_cast<> and show that API for
    // Property are the same whether you accessing local or remote
    // vobjects.

    try {
        vRef<Vobject> position = Vobject::findObjectFromRoot(siteurl + "/planet/position");

        listTypes(position);

        /*
          To extract the Property class interface from the position
          vobject, we use the template method meta_cast<>.  Given a
          Vobject or MetaObject, meta_cast<> returns the desired c++
          interface to that vobject if available, or NULL if not.
          Think of it as an elaborate typecast.
        */
        vRef<Property> positionproperty = meta_cast<Property>(position);

        std::cout << "vostut5client: The property value of " << positionproperty->getURLstr()
                  << " is now " << positionproperty->read() << std::endl;

    } catch(std::runtime_error& e) {
        std::cout << "Error!  " << e.what() << "\n";
    }
}

void listTypes(Vobject* vob)
{
    std::cout << "Types for " << vob->getURLstr() << ": ";
    for(TypeSetIterator types = vob->getTypes(); types.hasMore(); types++)
    {
        if(!types.atStart()) std::cout << ", ";
        std::cout << (*types);
    }
    std::cout << "\n";
}