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

[Mihael Hategan]

On Thu, 2007-10-04 at 22:53 -0500, Yong Zhao wrote:
> 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.

I think C pointers provide a very good model for this. We should perhaps
use that as a reference.

> 
> >
> > - 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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> > >
> > >
> >
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