When saving a Workspace, complete workspace is kept in memory to check its size

[marikaris]

How to Reproduce

When saving workspace it's turned into an ArmadilloWorkspace class, loading the workspace as a bytearray to determine its size:

molgenis-service-armadillo/armadillo/src/main/java/org/molgenis/armadillo/storage/ArmadilloWorkspace.java

Line 13 in 4c12f87

content = toByteArray(is);

Proposed solution

See if we can run this twice:

molgenis-service-armadillo/armadillo/src/main/java/org/molgenis/armadillo/command/impl/CommandsImpl.java

Line 202 in 4c12f87

rExecutorService.saveWorkspace(

First time to check the size of the workspace in a streaming way, the second time to actually save it (the name rExecutorService.saveWorkspace is a bit confusing, this method does not save yet, but calls a callback that can do something with the inputstream, so it could also check the size instead of saving it)
This is a bit annoying because it potentially will slow things. Check how much this affects usability.