[Swift-user] How can one force ordering into swift operations

[Michael Wilde]

A few brief additional tips to help you make progress with this:

- your split app can create and return a single file containing a list of file names

- use readData to read that list into an array; then use one of the array mappers to map the list of files.

Separately: the "flag" Dan suggests can also be done using a variable of type "external" which allows you to do explicit synchronization. Its only honored as a return or an input of an app() function.

- Mike

----- Original Message -----
> From: "Daniel S. Katz" <dsk at ci.uchicago.edu>
> To: "Lorenzo Pesce" <lpesce at uchicago.edu>
> Cc: "Glen Hocky" <hockyg at gmail.com>, "Swift User Discussion List" <swift-user at ci.uchicago.edu>
> Sent: Thursday, January 24, 2013 10:20:52 AM
> Subject: Re: [Swift-user] How can one force ordering into swift operations
> 
> 
> you could just add an artificial dependency. Make step out output
> file "flag" when it is done.
> 
> 
> Make step 2 dependent on file "flag"
> 
> 
> Dan
> 
> 
> 
> 
> 
> On Jan 24, 2013, at 11:13 AM, Lorenzo Pesce < lpesce at uchicago.edu >
> wrote:
> 
> 
> 
> So that I return an array of files of unknown size (don't know how
> many files they will be) to the calling swift script?
> 
> 
> 
> 
> 
> On Jan 24, 2013, at 10:08 AM, Glen Hocky wrote:
> 
> 
> 
> Lorenzo,
> This may not work for your purposes, but a simple solution similar to
> what I do, is to actually do step 1 in the wrapper before the
> mapping is done. This guarantees that all files are in place.
> 
> 
> Best,
> Glen
> 
> 
> 
> On Thu, Jan 24, 2013 at 10:43 AM, Lorenzo Pesce < lpesce at uchicago.edu
> > wrote:
> 
> 
> I have a simple problem:
> step 1: I run an app that splits a file in a group of files and we
> don't know how many they are.
> step2: I want to map those files using a mapper after the fact
> 
> Problem is that the mapper doesn't know that it can't run till step 1
> is done because it has no input files. How can I tell the mapper
> (and what follows it by consequence since those files will not be
> there) that it has to wait for step 1 to b finished?
> 
> Thanks,
> 
> Lorenzo
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> 
> --
> 
> 
> 
> 
> 
> Daniel S. Katz
> University of Chicago
> (773) 834-7186 (voice)
> (773) 834-6818 (fax)
> d.katz at ieee.org or dsk at ci.uchicago.edu
> http://www.ci.uchicago.edu/~dsk/
> 
> 
> 
> 
> 
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