2009/6/9 David Pollak <feeder.of.the.be...@gmail.com>:
> Sweet looking stuff!

Thanks.

>
> On Tue, Jun 9, 2009 at 6:18 AM, Jonas Bonér <jbo...@gmail.com> wrote:
>>
>> Hey guys.
>>
>> I have hacked together an early draft of the JTA transaction stuff.
>>
>> I have wrapped it up in a monad. Here  are some examples of usage:
>>
>>  for {
>>   ctx <- TransactionContext.Required
>>   entity <- updatedEntities
>>   if !ctx.isRollbackOnly
>>  } {
>>   // transactional stuff
>>   ctx.getEntityManager.merge(entity)
>>  }
>>
>> val users = for {
>>   ctx <- TransactionContext.Required
>>   name <- userNames
>>  } yield {
>>   // transactional stuff
>>   val query = ctx.getEntityManager.createNamedQuery("findUserByName")
>>   query.setParameter("userName", name)
>>   query.getSingleResult
>>  }
>>
>> If you don't like the monadic approach you can just use the high-order
>> functions:
>>
>> TransactionContext.withTxRequired {
>>    ... // REQUIRED semantics
>>
>>  TransactionContext.withTxRequiresNew {
>>    ... // REQUIRES_NEW semantics
>>  }
>> }
>>
>> I have implemented the same semantics as used in the EJB spec.
>> Required, RequiresNew, Mandatory, Supports, Never. All these are
>> monadic objects in the TransactionContext object.
>> I don't have a webapp to try this out, so I would be happy to get all
>> kinds of feedback, but API wise and bug reports or fixes.
>>
>> This API is hooked into Derek's Scala-JPA stuff. I had my own impl of
>> this but replaced it with Derek's work.
>>
>> Derek,
>> please go through the integration to see if I have done it correctly,
>> and where things code be improved.
>>
>> All committers,
>> feel free to hack and change this code anyway you want.
>>
>> The code is in a branch (wip-jta-jonas), you can find it here:
>>
>> http://github.com/dpp/liftweb/tree/3783b9e2200cc57dd72baa1bd8cabdb1365ee923/lift-jta
>>
>> Check the ScalaDoc (or the source) for the documentation on usage,
>> semantics etc.
>> Also see the README for configuration in persistence.xml etc.
>>
>> Currently it is hard-coded to use the Atomikos Transaction library and
>> Hibernate JPA, that would have to be configurable + some other options
>> as well. See the TODOs in the code.
>>
>> As I said, this needs feedback and testing. Thanks.
>>
>> --
>> Jonas Bonér
>>
>> twitter: @jboner
>> blog:    http://jonasboner.com
>> work:   http://crisp.se
>> work:   http://scalablesolutions.se
>> code:   http://github.com/jboner
>>
>>
>
>
>
> --
> Lift, the simply functional web framework http://liftweb.net
> Beginning Scala http://www.apress.com/book/view/1430219890
> Follow me: http://twitter.com/dpp
> Git some: http://github.com/dpp
>
> >
>



-- 
Jonas Bonér

twitter: @jboner
blog:    http://jonasboner.com
work:   http://crisp.se
work:   http://scalablesolutions.se
code:   http://github.com/jboner

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