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| kittonian | hi all | 02:04 |
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| kittonian | anyone around? | 02:04 |
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| phrearch | hi | 02:05 |
| phrearch | anyone mind helping me a bit making zope.security compile in pypy? | 02:05 |
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| nande | hey guys, i'm experimenting with zodb and threads, i've seen that i could create a new connection for other threads, but what shoudl i do with transactions | 19:35 |
| nande | i'm using transaction.commit() does that works from multiple threads? | 19:35 |
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| J1m_ | nande, connections and transaction managers are not thread safe. | 20:25 |
| J1m_ | sharing them across threads requires care and should only be done by experts. | 20:26 |
| nande | thanks J1m_ i'm not saying share a connection, instead create one connection per thread | 20:26 |
| J1m_ | This means, for example that if you want to share a transaction manager between threads, you need to create it and manager it yourself. | 20:26 |
| nande | i see. | 20:27 |
| J1m_ | You can't use the default per-thread manager. | 20:27 |
| nande | http://www.zodb.org/documentation/guide/transactions.html << i've read that i shouldnt use it, | 20:27 |
| nande | i've read that it was thread-aware... | 20:27 |
| J1m_ | It's thread aware n that it's tied to a specific thread by default. | 20:27 |
| nande | ransaction.get() < i use this | 20:27 |
| nande | i see. | 20:28 |
| nande | in the bottom of the doc i pointed it says i can share a storage as long as i create new connections for each thread, is that ok? | 20:28 |
| J1m_ | If you want cross-thread transactions, you need to create your own transaction manager and protect it yourself. This usually doesn't turn out well. | 20:28 |
| J1m_ | Yes, storages are thread safe. | 20:29 |
| nande | :( thanks | 20:29 |
| J1m_ | The usual model is that a transaction is used by a single thread. | 20:29 |
| J1m_ | That handles 99.9% (or more) if use cases. | 20:30 |
| J1m_ | s/if/of | 20:30 |
| nande | ok, i'll see if i can modify my structure. | 20:30 |
| nande | http://www.zodb.org/zodbbook/transactions.html#transaction-managers << this paragraph seems to say the oposite, is confusing | 20:37 |
| J1m_ | <shrug> I didn't write that. | 20:41 |
| J1m_ | I find a lot of technical documentation confusing this way. Often too terse and leaving questions unanswered. | 20:42 |
| J1m_ | Like, what does it mean to be "thread aware"? That's pretty vague. | 20:42 |
| nande | :/ no prob, but; are you sure of what you said to me? or should i listen to what the doc says? | 20:42 |
| nande | indeed. | 20:42 |
| J1m_ | Yes, I'm sure. I can't vouch for how you unserstood what I wrote. | 20:43 |
| J1m_ | s/wrote/said | 20:43 |
| J1m_ | s/unser/under | 20:43 |
| nande | don't worry at correcting yourself, i can't see the errors. | 20:46 |
| nande | so, i'll rephrase myself. Can i use the built-in transaction manager if i use transaction.get() on each thread? | 20:47 |
| J1m_ | As long as your transactions never span more than one thread, sure. | 20:47 |
| J1m_ | If you want to use multiple threads in a single transaction, then no. | 20:48 |
| nande | but if i want to use multiple threads, each one with its own transaction? (always commited/aborted transactions per thread) | 20:49 |
| J1m_ | Yes, that's fine. That's the standard pattern. | 20:50 |
| nande | thank god, thank you J1m_ for your time and help :) | 20:51 |
| kosh | hail insane people | 20:59 |
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