[kepler-dev] {Spam?} Re: array to sequence question

[Tristan King]

Thanks Bertram, that looks like it will hit the spot.I really need to spend
some time reading up on all the different domain types :).

On Wed, Nov 5, 2008 at 4:30 PM, Bertram Ludaescher <ludaesch at ucdavis.edu>wrote:

> Hi Tristan:
>
> You can *uncheck* the "enforceArrayLength" parameter of the ArrayToSequence
> actor (see attached snapshot).
>
> Then you can generate a token *stream* t1, t2, ..., tn from a *single*
> array token {t1, ..., tn}, without knowing the length n of the array.
>
> Of course you won't be able to use SDF in this scenario, but DDF will serve
> you fine: In the attached snapshot, note how 3 tokens 5,7,6 are created from
> a single array token {5,7,6}.
>
> In fact, what you need is a  "workflow pattern" that we've encountered
> quite a bit ourselves. For example, consider an actor that executes a
> command "ls -1". Often we want to execute a "job" on each generated output
> from "ls -1".
>
> In a sense, by generating one token per "job", we can do a kind of
> "iteration" over the original array...
>
> hope this helps..
>
> Bertram
>
>
> On Tue, Nov 4, 2008 at 6:40 PM, Tristan King <tristan.king at jcu.edu.au>wrote:
>
>> Hi,
>> I'm helping someone build a workflow and in it they have an arraytoken of
>> strings which they wish to write to a file. Since none of the file writing
>> actors can accept arrays (please correct me if i'm wrong), we had a look at
>> the ArrayToSequence actor.
>>
>> this works fine, except for the constraint that the size of the array has
>> to be specified, and since the size of our array is unknown, we cannot set
>> it.
>>
>> Is it possible to change the behaviour of the ArrayToSequence actor to
>> dynamically set the rate of token output based on the input to the actor?
>> Modifying the fire method to set the arrayLength variable to the length of
>> the received token seemed to work, but if the array was made larger the
>> second firing of the actor would fail.
>>
>> So, is it possible to build an actor with our desired functionality, or
>> does the nature of SDF scheduling prevent this (and please excuse my lack of
>> knowledge on sdf theory :))
>>
>> I suggested we could write a file writing actor to manage arraytokens, but
>> she want's to do some processing of each string before writing the data, so
>> converting it to a sequence is a more convenient solution.
>>
>> Cheers,
>> -Tristan
>>
>> --
>> Tristan King
>> Research Officer,
>> eResearch Centre
>> James Cook University, Townsville Qld 4811
>> Australia
>>
>> Phone: +61747816902
>> E-mail: tristan.king at jcu.edu.au www: http://eresearch.jcu.edu.au
>>
>
>


-- 
Tristan King
Research Officer,
eResearch Centre
James Cook University, Townsville Qld 4811
Australia

Phone: +61747816902
E-mail: tristan.king at jcu.edu.au www: http://eresearch.jcu.edu.au
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