[wildfly-dev] Getting ManagedThreadFactory in a subsystem

[Gytis Trikleris]

This thread is created when transaction subsystem starts and is active 
through the life cycle of the application server. If failure happens in 
any of the applications, periodic recovery finds the name of the 
compensation handler in tx-object-store. That handler is a CDI bean 
implemented by the application and has to be invoked in order to redo 
the work of the application. We use BeanManager to instantiate that 
handler and currently use JNDI to get it. Also, when compensate method 
is invoked it is very likely that implementation of it will need access 
to JNDI as well to get UserTransaction for example.

Additionally, before invoking the compensation handler we need to enable 
application's class loader (I still need to figure out the best way to 
store them, but I'm thinking of providing them to periodic recovery 
during the deployment of each application). Would that class loader help 
to solve JNDI issue or is there extra context I should save maybe?

Gytis

On 23/06/15 16:34, Stuart Douglas wrote:
> I don't know if ManagedThreadFactory is a great option, as then you 
> have a hard dependency on this being available,  which may not be the 
> case in some cut down configurations.
>
> Does this thread run in the context of a particular deployment, 
> otherwise this does not make a great deal of sense, as the JNDI 
> context is a per deployment construct.
>
> If this is a per deployment thing then you can manually set up the per 
> deployment contexts using the actions 
> under org.jboss.as.server.deployment.Attachments#SETUP_ACTIONS.
>
> Stuart
>
> On Tue, 23 Jun 2015 at 16:21 Gytis Trikleris <gytis at redhat.com 
> <mailto:gytis at redhat.com>> wrote:
>
>     Hello,
>
>     I’ve got an issue with my subsystem
>     (https://github.com/wildfly/wildfly/tree/master/transactions)
>     where I cannot access BeanManager or UserTransaction from JNDI (I
>     can however lookup datasources). This error is currently happening
>     during periodic recovery i.e. on PeriodicRecovery thread. My
>     assumption is that the CDI and EE JNDI environment are not
>     initialized because PeriodicRecovery extends Thread and was
>     created with the “new” operator rather than ManagedThreadFactory
>     and I know that EE apps are meant to use this approach to ensure
>     their environments are initialized correctly - does this
>     restriction apply to subsystems too? One issue I am coming up
>     against during prototyping is that I’m not sure how to get the
>     ManagedThreadFactory during our subsystems boot time as it does
>     not appear in JNDI.
>
>     I would like to know if it is possible to inject the
>     ManagedThreadFactory into my subsystem so I am not reliant upon
>     its availability in JNDI.
>
>     Thanks,
>     Gytis
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