On Ter, 2006-09-26 at 10:03 +1000, Russell Strong wrote:
> Hi,
>
> I've been pulling my hair out the last couple of days trying to get a
> simple python/ORBit example working.
>
> The server code ( see below ) show the following error
> Traceback (most recent call last):
> File "server", line 14, in increment
> self.count += 1
> AttributeError: 'Counter' object has no attribute 'count'
>
> Adding a line print dir(self) to increment shows there really is no
> count. Huh???
>
> The client ( see below ) shows:
> Traceback (most recent call last):
> File "client", line 13, in ?
> counter.increment()
> CORBA.UNKNOWN
>
> HELP !!!
>
> Client Code
> ----------------
>
> #!/usr/bin/env python
>
> import ORBit
> ORBit.load_file ('Test.idl')
> import CORBA, Test
>
> orb = CORBA.ORB_init()
> ior = open('/tmp/orbit-python.ior').readline()
> counter = orb.string_to_object(ior)
>
> for i in xrange(10001):
> try:
> counter.increment()
> except Test.Counter, data:
> print 'Overflow : ', data.count
>
>
> Server Code
> ----------------
>
> #!usr/bin/env python
>
> import ORBit
> ORBit.load_file('Test.idl')
> import CORBA, Test, Test__POA
>
> class Counter(Test__POA.Counter):
>
> def __init__(self):
> Test__POA.Counter.__init__(self)
> self.count = 0
>
> def increment(self):
> self.count += 1
> if self.count > 10000:
> e = Test.TestInterface.Overflow()
> e.count = self.count
> raise Test.TestInterface.Overflow, e
>
> orb = CORBA.ORB_init()
> poa = orb.resolve_initial_references("RootPOA")
If you change this code:
> ref = Counter()._this()
to this:
> counter = Counter()
> ref = counter._this()
Then it works (after you fix the rest of the code,
s/Test.TestInterface.Overflow/Test.Counter.Overflow/).
The reason is that this expression "Counter()._this()" creates a
Counter() servant, takes a CORBA object reference to it, but then the
servant's reference count drops to zero and the servant is deallocated
and deactivated. So the client ends up receiving a reference to a dead
object.
I'm not completely sure yet, but this looks like a PyORBit bug. Could
you open a bug report in bugzilla? Thanks.
--
Gustavo J. A. M. Carneiro
<[EMAIL PROTECTED]> <[EMAIL PROTECTED]>
The universe is always one step beyond logic.
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