Original file service improvements

[jamoore]

During the various other improvements to the original file service (multiple repositories, in memory representations ,etc.) it may be a good time to think about locking, whether optimistic or pessimistic. Especially for the jobs/scripts, someone may start a threaded uploader, and try to submit a job at the same time. At the moment, it's possible for the submit to request the job script, before the upload is even finished. Some ideas which may or may not already be covered by already planned improvements:

• add external (i.e. client) access to a read-write-lock
• have all files be unreadable until marked 'finished' (are they then immutable?)
• internally we could also use hibernateSession.lock(ofile) to up the optimistic lock number (if we enable it)
• service method could require a load OriginalFile, since it has an update event to use as a version number