[kepler-dev] Usage of LineWriter

[Edward A Lee]

The intent of the design of this actor is that it write
to the file the entire sequence of inputs that it gets
during an execution of the model.  If it overwrites a previous
file, it does not overwrite on each firing, but only once,
when it first starts writing...  I don't see any mechanism
in the design that would make the behavior domain dependent,
so I'm not sure what the bug could be there...

The actor could be adapted easily to overwrite on each
firing, but why would you want to do this?  If you are using
the actor to achieve "under the table" communication between
actors, then there is real risk of unexpected nondeterminacy.

That said, you could accomplish this effect by putting the
actor inside a RunCompositeActor composite...

Edward


At 04:45 PM 9/27/2004 -0700, Ilkay Altintas wrote:

>Hi,
>
>In a discussion with Xiaowen and Efrat, we've realized that the
>the behaviour of LineWriter changes depending on the domain.
>
>Looks like at some cases, even if the append and confirm overwrite
>are not selected, the file is being appended. (This was in a PN
>model.) In another model, in SDF, it executes and rewrites the file
>each time it fires as it is expected.
>
>In our workflow, Xiaowen and I need a LineWriter which will rewrite
>the file without confirming, in a PN model. Is it possible to use
>the existing LineWriter for this purpose?
>
>Thanks,
>Ilkay
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------------
Edward A. Lee, Professor
518 Cory Hall, UC Berkeley, Berkeley, CA 94720
phone: 510-642-0455, fax: 510-642-2739
eal at eecs.Berkeley.EDU, http://ptolemy.eecs.berkeley.edu/~eal