Public bug reported:

Neutron has already been able to make the agentless driver receive the security
group BEFORE/AFTER event by neutron callback logic. But this logic still
lacks the precommit function, like in Ml2 mechanism driver, which guarantees 
that the
mechanism driver DB and neutron DB operation are in the same transaction.
Because the MD may want to have the event callback function and hope its own DB
operation in the same transaction with neutron securitygroup db.

** Affects: neutron
     Importance: Undecided
     Assignee: yalei wang (yalei-wang)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => yalei wang (yalei-wang)

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https://bugs.launchpad.net/bugs/1522172

Title:
  add the new precommit event for security groups

Status in neutron:
  New

Bug description:
  Neutron has already been able to make the agentless driver receive the 
security
  group BEFORE/AFTER event by neutron callback logic. But this logic still
  lacks the precommit function, like in Ml2 mechanism driver, which guarantees 
that the
  mechanism driver DB and neutron DB operation are in the same transaction.
  Because the MD may want to have the event callback function and hope its own 
DB
  operation in the same transaction with neutron securitygroup db.

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