Re: [Zope-dev] transaction_manager attribute of transaction.interfaces.IDataManager
Laurence Rowe wrote: transaction_manager = zope.interface.Attribute( The transaction manager (TM) used by this data manager. This is a public attribute, intended for read-only use. The value is an instance of ITransactionManager, typically set by the data manager's constructor. ) This seems to be used only in the tests, I guess it would be useful if you were using multiple transaction managers in a single thread. Can you think fo examples where that would happen? What is a transaction manager? cheers, Chris ___ Zope-Dev maillist - Zope-Dev@zope.org https://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - https://mail.zope.org/mailman/listinfo/zope-announce https://mail.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] transaction_manager attribute of transaction.interfaces.IDataManager
On 8 June 2010 11:25, Chris Withers ch...@simplistix.co.uk wrote: Laurence Rowe wrote: transaction_manager = zope.interface.Attribute( The transaction manager (TM) used by this data manager. This is a public attribute, intended for read-only use. The value is an instance of ITransactionManager, typically set by the data manager's constructor. ) This seems to be used only in the tests, I guess it would be useful if you were using multiple transaction managers in a single thread. Can you think fo examples where that would happen? Perhaps if you wanted to use an event based (as opposed to threaded) server. Laurence ___ Zope-Dev maillist - Zope-Dev@zope.org https://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - https://mail.zope.org/mailman/listinfo/zope-announce https://mail.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] transaction_manager attribute of transaction.interfaces.IDataManager
Laurence Rowe wrote: On 8 June 2010 11:25, Chris Withers ch...@simplistix.co.uk wrote: Laurence Rowe wrote: transaction_manager = zope.interface.Attribute( The transaction manager (TM) used by this data manager. This is a public attribute, intended for read-only use. The value is an instance of ITransactionManager, typically set by the data manager's constructor. ) This seems to be used only in the tests, I guess it would be useful if you were using multiple transaction managers in a single thread. Can you think fo examples where that would happen? Perhaps if you wanted to use an event based (as opposed to threaded) server. Yes, annoyingly that's exactly what I'm doing ;-) I need to manage transactions in a twisted application, so I guess I can't just do: import transaction transaction.get() :-( I don't suppose anyone has examples of using the transaction package in an asyncronous, event-based environment? cheers, Chris ___ Zope-Dev maillist - Zope-Dev@zope.org https://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - https://mail.zope.org/mailman/listinfo/zope-announce https://mail.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] transaction_manager attribute of transaction.interfaces.IDataManager
On Tue, Jun 8, 2010 at 6:23 AM, Laurence Rowe l...@lrowe.co.uk wrote: On 8 June 2010 09:45, Chris Withers ch...@simplistix.co.uk wrote: Hi All, What is this attribute actually used for? I see it present on IDataManager but I notice that zope.sqlalchemy's SessionDataManager doesn't have this attribute, with no apparent ill effect. transaction_manager = zope.interface.Attribute( The transaction manager (TM) used by this data manager. This is a public attribute, intended for read-only use. The value is an instance of ITransactionManager, typically set by the data manager's constructor. ) This seems to be used only in the tests, I guess it would be useful if you were using multiple transaction managers in a single thread. I've now added it to zope.sqlalchemy's data manager. I'm in favor of removing it from the interface. Jim -- Jim Fulton ___ Zope-Dev maillist - Zope-Dev@zope.org https://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - https://mail.zope.org/mailman/listinfo/zope-announce https://mail.zope.org/mailman/listinfo/zope )
