Clojure

Invariants and the STM

Details

  • Type: Enhancement Enhancement
  • Status: Open Open
  • Priority: Major Major
  • Resolution: Unresolved
  • Affects Version/s: None
  • Fix Version/s: None
  • Component/s: None
  • Labels:
    None

Description

(ticket requested here http://groups.google.com/group/clojure/browse_thread/thread/119311e89fa46806/4903ce25ff6deaa6#4903ce25ff6deaa6)

The general idea is to declare invariants inside a transaction and, when at commit time an invariant doesn't hold anymore, the transaction retries.
So it can both act as a kind of soft ensure or to specify actions that "partially commute".
Thus it would enable coarser refs.

See the attached file for quick prototype.

User code would looks like:

(invariant (@world :key))
(commute world update-in [:key] val-transform-fn)

This means the commute will occur only if (@world :key) returns the same value in-transaction and at commit point.

Activity

Alex Miller made changes -
Field Original Value New Value
Fix Version/s Backlog [ 10035 ]
Alex Miller made changes -
Priority Major [ 3 ]

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  • Assignee:
    Unassigned
    Reporter:
    Anonymous
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  • Created:
    Updated: