0.4 Sharing Use Case Candidates

Goals:

• Enumerate the list of possible sharing use cases we can reasonably look to implement in 0.4. Intent is start with too much and whittle down to a do-able set.
• Purpose of these use cases is to provide scoping and prioritization directions for both design and engineering

The Use Cases:

Calendar View Sharing:

At the minimum, we should provide sharing capabilities roughly at the 0.1 release functionality

• Mitch shares his calendar in a read-only fashion
• Calendar view is either public or private, there are no individual permissions
• Users are invited to view Mitch's calendar through email if available or in an out-of-band fashion through the view URL [OI]
• Support for both remote browsing(?) and view replication
• When Mitch adds, changes or deletes a calendar item, the change is reflected to all sharees
• Sharer and sharee recovers gracefully when connection is severed unexpectedly

Additionally, we can add the following features (in suggested order) :

• Sharees can modify (write privilegse) remote calendar
• Access control lists and individual permission levels (e.g. Esther has read/write, while Freada has read permission)
• Sharee gets to move remote calendar event to local calendar layer (item replication)
• Authentication of each user (either as per CanogaSharingInitiation or Dartmouth PKI proposal)
• Notify users of available share and subsequent changes to remote share
• Support for sharing to groups as well as individuals
• Support for ItemConversations^?

Explicitly, NO:

• Republishing/chain-sharing
• Firewall sharing
• non-Chandler users or iTip/iMip support
• Calendar invitation workflow nor free/busy information
• Annotations ( & sharing of annotations)

Content Item Sharing

Content item sharing probably requires basic Email or IM functionality. In 0.4, should we try to kludge a workflow without eMail? Or should we provide really skeletal eMail just to support sharing? other ideas?

• Send a Content Item as an attachment
• Push a "hot-linked" contact to sharee(s) see CanogaSharingInitiation#ItemSharing
  • with read/write permissions

Use Case Questions

• What is acceptable performance?
  • When receiving the first remote calendar view?
  • When receiving an update?
• What is the limit on the number of users for 0.4 to behave "reasonably"?

-- ChaoLam - 18 Feb 2004