[omniORB] Tie Classes

[Sai-Lai Lo]

Tie class generation has been implemented and will be available in the next
snapshot. 

For each interface, a template class is generated. 

To use the template in eg3_impl.cc for example:

  Echo_i *myimpl = new Echo_i();
  _tie_Echo<Echo_i,1> *myobj = new _tie_Echo<Echo_i,1>(myimpl);
  myobj->_obj_is_ready(boa);

The template class looks like this:


template <class T,CORBA::Boolean release>
class _tie_Echo : public virtual _sk_Echo
{
public:
  _tie_Echo (T* o) : pd_obj(o), pd_release(release) {}
  _tie_Echo (T* o, const omniORB::objectKey& k) : _sk_Echo(k), pd_obj(o), 
                                                  pd_release(release) {}
  ~_tie_Echo() { if (pd_release) delete pd_obj; }
  virtual char *  echoString ( const char *  mesg ) {  
           return pd_obj->echoString ( mesg ); }
private:
  T* pd_obj;
  CORBA::Boolean pd_release;
  _tie_Echo();
};


The second parameter <release> to the template class tells the class
instance whether to call delete on the implementation when _dispose is
called. Usually <release> is always 1 except when the same implementation
is used to support multiple interfaces, in which case, only one or zero of
the template class instances should have the <release> flag set to 1.

Sai-Lai



Nick Reeves <nickr@harlequin.co.uk> writes:

> I have a vague memory this question may have been asked before but I
> can't find it in the archives.
> 
> Are there any plans to add Tie class generation to the IDL compiler as
> is provided with many other IDL compilers ?
> 
> This frees the servants from having to inherit from the implementation base
> class by providing Tie classes which simply delegate all operations to
> the servant.
> 
> If not how do other people handle implementing inheritance among
> servant classes, and would work on extending the IDL compiler to
> generate Tie classes be considered appropriate for merging back into
> the main source.
> 


-- 
Dr. Sai-Lai Lo                          |       Research Scientist
                                        |
E-mail:         S.Lo@orl.co.uk          |       Olivetti & Oracle Research Lab
                                        |       24a Trumpington Street
Tel:            +44 223 343000          |       Cambridge CB2 1QA
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