BusAccess.h

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//# BusAccess.h: tools for getting access to a dbus object
//# Copyright (C) 2009
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library is distributed in the hope that it will be useful, but WITHOUT
//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//#        Internet email: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA
//#
//# $Id$

#ifndef DBUS_BUSACCESS_H_
#define DBUS_BUSACCESS_H_
#include <list>
#include <string>
#include <cstdio>
#include <unistd.h>
#include <stdexcept>

namespace casa {
    namespace dbus {    
        // this function is a little odd... it gets a connection with a unique name
        // (via a suffix) using 'name' and upon success returns 'path', otherwise
        // it throws an exception...
        std::string adaptor_object( const std::string &name, const std::string &path );
        std::string object( const std::string &name );
        std::string path( const std::string &name );

        class address {
            public:
                    address( const std::string &bus_address, bool unique=true );
                        address( );
                        virtual ~address( );
                        std::string busName( ) const { return name_; }
            private:
                        std::string generate_name( const std::string &base, bool unique=true );
                        std::string name_;
        };

        char *launch_casa_proxy( bool unique_name, const std::string &dbusname, const std::string &default_name,  const std::list<std::string> &args );

        template<class proxy> proxy *launch( const std::list<std::string> &args=std::list<std::string>( ), bool unique_name=true,
                                             const std::string &name="", int trys=60, unsigned long delay=500000 ) {
            char *dbname = launch_casa_proxy( unique_name, name, proxy::dbusName( ), proxy::execArgs(args) );
            if ( dbname == 0 ) { throw  std::runtime_error( "launch failed" ); }
            proxy *result = 0;
            int count = trys;
            while ( count > 0 ) {
                usleep(delay);
                try {
                  result = new proxy(dbname);
                  break;
                } catch (...) { }
                --count;
            }
            delete [] dbname;
            return result;
        }

    }
}

#endif