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root / snf-cyclades-app / synnefo / db / managers.py @ 039e3e61

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# Date Author Comment
adc46059 09/28/2012 12:19 pm Christos Stavrakakis

Perform allocations in separate transactions

Add ForUpdateManager to the Backend model, in order to guarantee
exclusive order when allocating a VM.

Use manual transactions when allocating Backend and public IP for a new
VM, since these allocations need exclusive access (SELECT..FOR UPDATE)...
864bed43 07/23/2012 11:49 am Christos Stavrakakis

Implement model manager using row-level db locking

Implement ForUpdateManager that uses SELECT .. FOR UPDATE statement in
order to acquire row-level exclusive locks to DB. Essentially this
manager backports the select_for_update() method that is implemented in...