Hi Robert,
I probably haven't paid enough attention to the DataSqueezer posts on
the Cayenne/Tapestry mailing lists. I was under the assumption you
needed to implement a custom squeezer if you wanted bind a DataObject
as a DirectLink parameter. Are there other instances where the
standard Tapestry squeezing implementation with DataObjects jack me up?
I just haven't come across a problem (with a handful of apps), but
maybe I'm missing something?
Thanks,
Eric
On Oct 25, 2005, at 10:59 AM, Robert Zeigler wrote:
> Sorry, I must've missed your e-mail on the tapestry list.
> Using the squeeze adapter is a matter of implementing the
> two interfaces it requires. One is ObjectIdStorageProvider.
> If you never use objects which are in state "NEW" in your pages,
> then this interface is unimportant and you can have a "dummy"
> implementation. Otherwise, what this interface is for is to
> store (in memory) the (temporary) ObjectId object or a data object in
> state NEW.
>
> The other interface is the "DataContextProvider" (single method:
> getValidDataContext()).
> The purpose is to provide the squeezer with a "valid" d.c. for the
> current
> thread.
>
> Once you've implemented the interfaces...
>
> If you're using tapestry 3.0.3, you'll have to subclass BaseEngine.
> In your subclass, override createSqueezeAdapter with something like:
>
> ISqueezeAdaptor[] adapters = {
> new DataObjectAdaptor(new DataContextProviderImp(),
> new
> ObjectIdStorageProviderImp())
> };
> return new DataSqueezer(getResourceResolver(), adapters);
>
>
> If you're using tapestry 4.0.beta-xxx, then you can skip the
> subclassing
> and just define the adapter in your hivemind config file.
> There are many examples of how to do this posted throughout
> the userlist archives, and I believe on the tapestry wiki, as well.
>
> Robert
>
> jaka lustek wrote:
>
>
>> Hi,
>>
>> I posted similar question on Tapestry list, but did not get the
>> answer
>> so far. Can someone explain the steps to use CayenneDataSqueezer with
>> Tapestry. I downloaded the squeezer from Tassel. I don't want to go
>> statefull, is it possible to achieve this with CayenneSqueezer? I
>> hope I
>> am not asking silly questions.
>>
>> I have a tiny web app, just two pages, the first is collecting
>> answers
>> with radio group buttons, and the second is collecting user data. The
>> model will use some three tables and some relationships. Simple
>> model,
>> simple web app, but as I am new to Cayenne Tapestry world I need some
>> hints. I intend to present this app in my company as a proof of
>> concept
>> when will be ready (and this shold happen very soon).
>>
>> Thanks,
>> Borut
>>
>> ____________________
>> http://www.email.si/
>>
>>
>>
>
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