Re: [Zope-dev] transaction_manager attribute of transaction.interfaces.IDataManager
On Tue, Jun 8, 2010 at 6:23 AM, Laurence Rowe wrote: > On 8 June 2010 09:45, Chris Withers 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 )
Re: [Zope-dev] transaction_manager attribute of transaction.interfaces.IDataManager
Laurence Rowe wrote: > On 8 June 2010 11:25, Chris Withers 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 8 June 2010 11:25, Chris Withers 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
On 6/8/10 12:25 , Chris Withers 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? > > What is a "transaction manager"? See transaction.interfaces.ITransactionManager Wichert. ___ 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: > 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 09:45, Chris Withers 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. 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 )
