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367 class Operation(object): |
367 class Operation(object): |
368 """an operation is triggered on connections pool events related to |
368 """an operation is triggered on connections pool events related to |
369 commit / rollback transations. Possible events are: |
369 commit / rollback transations. Possible events are: |
370 |
370 |
371 precommit: |
371 precommit: |
372 the pool is preparing to commit. You shouldn't do anything things which |
372 the pool is preparing to commit. You shouldn't do anything which |
373 has to be reverted if the commit fail at this point, but you can freely |
373 has to be reverted if the commit fails at this point, but you can freely |
374 do any heavy computation or raise an exception if the commit can't go. |
374 do any heavy computation or raise an exception if the commit can't go. |
375 You can add some new operation during this phase but their precommit |
375 You can add some new operations during this phase but their precommit |
376 event won't be triggered |
376 event won't be triggered |
377 |
377 |
378 commit: |
378 commit: |
379 the pool is preparing to commit. You should avoid to do to expensive |
379 the pool is preparing to commit. You should avoid to do to expensive |
380 stuff or something that may cause an exception in this event |
380 stuff or something that may cause an exception in this event |
388 the transaction has been either rollbacked either: |
388 the transaction has been either rollbacked either: |
389 * intentionaly |
389 * intentionaly |
390 * a precommit event failed, all operations are rollbacked |
390 * a precommit event failed, all operations are rollbacked |
391 * a commit event failed, all operations which are not been triggered for |
391 * a commit event failed, all operations which are not been triggered for |
392 commit are rollbacked |
392 commit are rollbacked |
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393 |
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394 postcommit: |
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395 The transaction is over. All the ORM entities are |
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396 invalid. If you need to work on the database, you need to stard |
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397 a new transaction, for instance using a new internal_session, |
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398 which you will need to commit (and close!). |
393 |
399 |
394 order of operations may be important, and is controlled according to |
400 order of operations may be important, and is controlled according to |
395 the insert_index's method output |
401 the insert_index's method output |
396 """ |
402 """ |
397 |
403 |