[Swift-devel] Re: passing types and variables in swift

[Yong Zhao]

Mike

> while we're discussing mappers, could you or Ben clarify:
>
> - can a mapper be only used on a single variable declaration? ie you can
> not map a dataset to a variable within a struct?  this would be useful
> eg to create a struct that has both file and scalar valued members, to
> set up a parameter sweep where each file needs specific parameters.

This would be the nested mapper scenario, in order to make the scripts
cleaner, I was think about a mapping descriptor (which could be an XML
file to describe each layer of the mapping), but this is kind of far
reaching.

>
> - are mappers processed before the program (or procedure) starts
> executing? so you cant use a mapper like an assignment statement to set
> or reset a variable?
>
Mappers are evaluated before procedure execution, the only exception is
when a mapper depends on some intermediate data, and it will wait for that
data to be available (as in the montage workflow). However, mapping is
different from assignment (in assignment, it is more like calling a
mapping function such as @extractint). A variable currently can not be
reset or reassigned, unless it is an interation variable (it gets
re-assigned implicitly).

Yong.

> - mike
>
> On 10/4/07 10:21 PM, Yong Zhao wrote:
> > Mappers should ideally be able to map primitive types such as string and
> > int, as well as file names. The CSVMapper can read all the values in the
> > file, it is just that it needs to interprete the values according to their
> > types. So If we convey the type info 'RGIparams' to the csv mapper, it
> > should have no problem reading the values.
> >
> > I actually added getType and setType to the mapper interface, that did
> > not get into the release, but I think it is what it should have.
> >
> > Yong.
> >
> > On Thu, 4 Oct 2007 andrewj at uchicago.edu wrote:
> >
> >> All right, thanks.
> >>
> >> I am just trying to figure out the best way to setup parameter
> >> sweeps.  Ideally, I would like to have some file of directory
> >> of files containing experiments to be run on the Grid
> >> environment and Swift picks them up and automatically sets up
> >> the appropriate WF based on the parameter information in the
> >> files.
> >>
> >>
> >>> On Wed, 3 Oct 2007, andrewj at uchicago.edu wrote:
> >>>
> >>>> could I do something like this:
> >>>>
> >>>> RGIparams RGIinput[] <csv_mapper;file="rgi_runs.txt">;
> >>>>
> >>>> where rgi_runs would contain say
> >>>>
> >>>> 1,2,true
> >>>> 3,4,false
> >>>> 18,20,true
> >>>>
> >>>> and so on..so that the parameters are passed into the workflow?
> >>> no.
> >>>
> >>> mappers only map filenames (or URIs now); they don't map
> >> variable values.
> >>> --
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> >>
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> >
>