On 31 Mar 2010, at 17:58, Blake Caldwell wrote:
From the few hours I've spent with Twig, it seems easier - not harder than JDO for everything I'm doing.
Nice to hear. You should get improved in ease of use from all of the non-standard persistence interfaces designed specifically at the datastore - just choose the features you need. Twigs ObjectDatastore aims to be as efficient as hand coded low-level solutions with no startup overhead. Unlike some of the other frameworks there is no "registration" process for your data model classes - each class is analyzed the first time it is used per server instance and the meta- data is cached for the duration of the instance.
One user found that queries which had to be run as tasks previously with JDO could now be calculated on the fly in real time by using the ObjectDatastore.
Performance can be compared directly to JDO - I believe that Twig is the only option which allows you to reuse you stored JDO data - correct me if I am wrong on that.
If you want to use JPA or JDO because you're already familiar with them, that's great and all, but the mapping to BigTable isn't that straight forward, so cramming the framework on top might not be the answer. Create a data store tier, wrap all Twig/Objectify logic in there, and while your app won't be as portable as if you were using JDO, it'll perform better, use less resources, and not be terribly dificult to port later on, if you have to.
Exactly. If you ever find yourself creating DTO's to abstract away details of the persistence framework you use then consider that data models in Twig *are* your DTOs - they have no dependencies at all. Pure POJOs which are really simple to port to any persistence interface you choose.
It also makes working with GWT a breeze because you can send a whole object graph over the wire without having to fetch each item by Key (or Key<T>)
My $0.02
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