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Posted to user@cayenne.apache.org by Nishant Neeraj <ni...@gmail.com> on 2011/02/12 13:45:09 UTC

Upgrading 3.0 to 3.1

Hi,


I have been trying to upgrade Cayenne from v3.0 to v3.1. I have read the
changes in Upgrade.txt bundled with the modeler download.

I have used DataContext pretty extensively. In fact, I have a singleton for
creating DataContext. Now, with new changes, it seems to me that DataContext
has been eliminated and advised to use ObjectContext using
ServerRuntime.getContext(...) instead. So, now I have thousands of places
where I have done MySingleton.getDataContext().commitChanges() needed to be
changed. (which I will do)

I wanted to confirm that going forward, I will need to replace

      DataContext.createDataContext()

with

      ServerRuntime cayenneRuntime = new
ServerRuntime("cayenne-edushare.xml");
      cayenneRuntime.getContext()

Or, am I missing something?

Thanks
Nishant

Re: Upgrading 3.0 to 3.1

Posted by Andrus Adamchik <an...@objectstyle.org>.
And of course a common disclaimer: 3.1 is still Alpha, and while it is great that people try it (we encourage early adopters; fwiw I am also running 3.1 in production), but be prepared for the new API to change as it evolves.

Andrus

On Feb 13, 2011, at 10:54 AM, Andrus Adamchik wrote:

> DataContext is an implementation of ObjectContext, so returned ObjectContext is really a DataContext. Not much change here. So if you can, use ObjectContext API in an abstract way, but if you absolutely have to reference DataContext explicitly, use a cast:
> 
> DataContext context = (DataContext) cayenneRuntime.getContext();
> 
> Andrus
> 
> 
> On Feb 12, 2011, at 2:45 PM, Nishant Neeraj wrote:
>> Hi,
>> 
>> 
>> I have been trying to upgrade Cayenne from v3.0 to v3.1. I have read the
>> changes in Upgrade.txt bundled with the modeler download.
>> 
>> I have used DataContext pretty extensively. In fact, I have a singleton for
>> creating DataContext. Now, with new changes, it seems to me that DataContext
>> has been eliminated and advised to use ObjectContext using
>> ServerRuntime.getContext(...) instead. So, now I have thousands of places
>> where I have done MySingleton.getDataContext().commitChanges() needed to be
>> changed. (which I will do)
>> 
>> I wanted to confirm that going forward, I will need to replace
>> 
>>     DataContext.createDataContext()
>> 
>> with
>> 
>>     ServerRuntime cayenneRuntime = new
>> ServerRuntime("cayenne-edushare.xml");
>>     cayenneRuntime.getContext()
>> 
>> Or, am I missing something?
>> 
>> Thanks
>> Nishant
> 
>

Re: Upgrading 3.0 to 3.1

Posted by Andrus Adamchik <an...@objectstyle.org>.
DataContext is an implementation of ObjectContext, so returned ObjectContext is really a DataContext. Not much change here. So if you can, use ObjectContext API in an abstract way, but if you absolutely have to reference DataContext explicitly, use a cast:

DataContext context = (DataContext) cayenneRuntime.getContext();

Andrus


On Feb 12, 2011, at 2:45 PM, Nishant Neeraj wrote:
> Hi,
> 
> 
> I have been trying to upgrade Cayenne from v3.0 to v3.1. I have read the
> changes in Upgrade.txt bundled with the modeler download.
> 
> I have used DataContext pretty extensively. In fact, I have a singleton for
> creating DataContext. Now, with new changes, it seems to me that DataContext
> has been eliminated and advised to use ObjectContext using
> ServerRuntime.getContext(...) instead. So, now I have thousands of places
> where I have done MySingleton.getDataContext().commitChanges() needed to be
> changed. (which I will do)
> 
> I wanted to confirm that going forward, I will need to replace
> 
>      DataContext.createDataContext()
> 
> with
> 
>      ServerRuntime cayenneRuntime = new
> ServerRuntime("cayenne-edushare.xml");
>      cayenneRuntime.getContext()
> 
> Or, am I missing something?
> 
> Thanks
> Nishant