[kepler-dev] Bug 4549: String Replace actor "remembers" previous execution values

[Oliver Soong]

When PortParameters are attached on the port, but no token arrives,
what are they supposed to send?  I'm under the impression that
attached ports aren't always guaranteed to receive a token, but I may
be mistaken.

Oliver


On Thu, Jan 14, 2010 at 10:12 AM, ben leinfelder
<leinfelder at nceas.ucsb.edu> wrote:
> Christopher -
> You're right that the problem arises because RExpression does not always
> produce a token on the graphicsFileName output port. Should it?
> If that's the case then we can forget about any changes to StringReplace.
> I'd rather not be mucking around in there anyway.
> -ben
>
> On Jan 14, 2010, at 10:03 AM, Christopher Brooks wrote:
>
>> Hi Ben,
>> On http://bugzilla.ecoinformatics.org/show_bug.cgi?id=4549
>> I think the problem might be that RExpression is not producing
>> data every time it is fired?  This would make it
>> difficult to use RExpression in SDF.  I'm not sure about this
>> though.
>>
>> The issue is that StringReplace has port parameters, so
>> it can be used as a source with no inputs.
>>
>> Try running $PTII/ptolemy/actor/lib/string/test/auto/StringReplace2.xml
>> with your changes.
>>
>> I just backed out your changes because they break that test.
>> Sorry about that, but I'm in the process of building test releases
>> and don't want regressions right now.
>>
>> I believe that there is this generic issue with RExpression and
>> any actor that has PortParameters.
>>
>> I'm focussing on other things right now, but if you could create
>> a simple demo that illustrates the problem that does not use
>> RExpression, then we might get some traction here.
>>
>> _Christopher
>> --
>> Christopher Brooks, PMP                       University of California
>> CHESS Executive Director                      US Mail: 337 Cory Hall
>> Programmer/Analyst CHESS/Ptolemy/Trust        Berkeley, CA 94720-1774
>> ph: 510.643.9841 fax:510.642.2718             (Office: 545Q Cory)
>> home: (F-Tu) 707.665.0131 cell: 707.332.0670
>
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-- 
Oliver Soong
Donald Bren School of Environmental Science & Management
University of California, Santa Barbara
Santa Barbara, CA 93106-5131
805-893-7044 (office)
610-291-9706 (cell)