[rules-dev] Drools Flow in EJBs

[Mark Proctor]

On 01/11/2010 19:05, tizo wrote:
>
>
> On Mon, Nov 1, 2010 at 4:21 PM, Mark Proctor <mproctor at codehaus.org 
> <mailto:mproctor at codehaus.org>> wrote:
>
>     On 01/11/2010 15:31, tizo wrote:
>>     On Wed, Oct 27, 2010 at 5:21 PM, tizo <tizone at gmail.com
>>     <mailto:tizone at gmail.com>> wrote:
>>
>>         Hi there,
>>
>>         I have seen in chapter 6 of the documentation, that Drools
>>         Flow can be configured to use JPA and transactions to persist
>>         the running states. However, I am in a EJB where I obtain
>>         entity managers with a @PersistenceContext annotation, and
>>         the transactions are managed by the container, whereas in the
>>         example an EntityManagerFactory and a TransactionManager are
>>         used.
>>
>>         Could I configure Flow in a direct way to be used by my EJB?
>>
>>         Thanks very much,
>>
>>         tizo
>>
>>
>>     Ok, looking at the code, I guess that Drools flow is not ready to
>>     work with standards EJBs. The reasons are the following:
>>
>>      * The JPA annotations are not standard JPA annotations, but
>>     hibernate ones. For example "CollectionOfElements" in
>>     ProcessInstanceInfo class.
>     That was the one element we couldn't find a replacement for in
>     JPA1, JPA2 fixes this, but we haven't updated to JPA2 yet. I don't
>     believe we use any other hibernate specific annotations.
>
>>      * Transactions are managed by Drools, as opposed to some EJBs
>>     where transactions are managed by the container.
>     You can use both JTA transactions and local entity transactions.
>     So transactions can be drools maintained or container/external
>     maintained.
>>
>>     As for that, I will probably modify the codes, so Flow could be
>>     used in our EJBs. I would like to know if someone could guide me
>>     on what should I modify.
>>
>>     I will post the modifications in case they are of interest to
>>     someone.
>>
>>     Thanks very much,
>>
>>     tizo
>>
> Mark,
>
> Thanks for your response. Could you tell me how can I use Drools with 
> my container managed transactions, or where can I read how to do 
> that?. I think that the example given in the documentation (Drools 
> Flow, 6.1.4 - Transactions) does not apply to this case, and I can't 
> figure out how to do it.
Shows configuring a JTA transaction here:
http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/javadocs/stable/drools-api/org/drools/persistence/jpa/JPAKnowledgeService.html

Mark
>
> Thanks again,
>
> tizo
>
>
>
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