[SAGA-RG] Semantics of NSEntry.move() ?

[Andre Merzky]

Hi Mathijs, 

Quoting [Mathijs den Burger] (Sep 30 2009):
> 
> Hi all,
> 
> The notes of ns_entry.move(saga::url target) say:
> 
>   - an identical copy exists at target
>   - the original entry is removed
> 
> The postcondition of ns_entry.remove() says:
> 
>   the original entry is closed and removed
> 
> Does this imply that ns_entry.move() also closes the original ns_entry?
> The spec is a bit vague here...

Yes, that is indeed somewhat vague, I'll try to clarify.

For now: no, the semantics of remove() is not used by mopve(), in
particular the entry stays open.

What basically is supposed to happen is:

  // prepare: 
  // # rm -rf /tmp/t1 
  // # rm -rf /tmp/t2 
  // # ls >   /tmp/t1

  saga::name_space::directory d ("file://localhost/tmp/");
  saga::name_space::entry     e = d.open ("t1");

  assert (   d.exists ("t1") );
  assert ( ! d.exists ("t2") );

  std::cout << e.get_url () << " : " << e.get_size () << std::endl;
  e.move ("t2", Overwrite);
  std::cout << e.get_url () << " : " << e.get_size () << std::endl;

  assert ( ! d.exists ("t1") );
  assert (   d.exists ("t2") );

this should print

  file://localhost/tmp/t1 : 1234
  file://localhost/tmp/t2 : 1234

and the asserts should pass.  In particular, the entry 'e' stays
open and is in a valid state.

Does that make sense?  As said, I'll try to clarify that in the
spec.

Cheers, Andre.


> -Mathijs

-- 
Nothing is ever easy.