/snf-cyclades-app/synnefo/db/managers.py - Changes - Synnefo - Greek Research and Technology Network's projects

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#	Date	Author	Comment
dbecf586	02/14/2013 01:38 pm	Christos Stavrakakis	Fix whitespace, Licence
1c11bace	02/14/2013 01:25 pm	Christos Stavrakakis	Re-implement select_for_update Previous implementation of 'select_for_update' method was based on an attribute of the 'ForUpdateManager'. However, the model manager is shared between all threads, which lead to race conditions. This commit reimplements 'select_for_update', by making it return a custom QuerySet...
68b952f9	02/01/2013 04:52 pm	Christos Stavrakakis	pep8 fixes
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...