SnapshotService

[rsoika]

Implementation of SnaptshotService EJB which is generating snapshots.

The snapshot process includes the following stages:

• create a copy of the current workitem
• compute a snapshot $uniqueId containing a timestamp
• change the type with the prefix 'archive-'
• If an old snapshot already exists, Files are compared to the current $ files and, if necessary, stored in the Snapshot applied
• remove file content form the origin-workitem
• store the snapshot uniqeId into the origin-workitem ($snapshotID)
• remove deprecated snapshots