This design document is now obsolete

Design Goals

1. Allow scientists to write the workflow activities in their preferred language
   • approach: further develop the Synapse R client and the service APIs that it utilizes
2. Ensure that scientists can use the same code as workflow activities AND also for one-off tasks they want to run on their laptops
   • approach: use a particular input/output parameter scheme for all R scripts
   • approach: R scripts have no direct dependencies upon Amazon's Simple Workflow Service, they only depend upon Synapse
3. Ensure that the workflow is scalable to many nodes running concurrently
   • approach: use Amazon's Simple Workflow system
4. Minimize the amount of workflow decision logic needed in non-R code
   • approach: to keep the complicated logic about whether a particular script should be run on a particular piece of source data out of Java, instead pass all source data to every R script and let the R script decide whether it wants to work on the data or not

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To invoke a script locally:

R createMatrix.R --args --username 'nicole.deflaux@sagebase.org' --password XXXXX --datasetId 543 --layerId 544

Script workflow output to STDOUT:

blah blah, this is ignored ...
SynapseWorkflowResult_START
{"layerId":560}
SynapseWorkflowResult_END
blah blah, this is ignored too ...

...