Thanks Edson, 

- What exactly is a "PR" ? >  I wouldn't mind helping with the documentation.

- how would I declare my own clock implementation in the session configuration? I can't find any example for this. (?) 

Alex

On 30.09.2013, at 16:23, Edson Tirelli <ed.tirelli@gmail.com> wrote:

   Alexander,

   Regarding the clock, to be honest, I think you found a loophole... :) the original design does not allow switching out clocks on an existing session as it is impossible for the engine to guarantee consistency in such case. Additionally, in my experience, real time clocks are usually not the best choice for production applications. They require less code, but in the end, the application has no control over the time flow and can create several situations that will make it impossible for you to obtain the desired results.

   My suggestion is always to use a pseudo clock and have your application control it based on your desired behaviour. This can be as simple as a thread syncing the clock with the machine clock at predefined intervals, or based on a clock heartbeat event, or based on the streams of events, etc.

   Thanks for pointing out the docs errors. We will update them for the next release (6.0.0). Also, if you can submit a PR with the update, always happy to apply.

   Edson

On Mon, Sep 30, 2013 at 9:21 AM, Alexander Wolf <mail@alexander-wolf.net> wrote:

[SOLUTION]

I found a "solution/workaround" to this problem:
I create the session with JPAKnowledgeService.newStatefulKnowledgeSession() and pseudo clock in configuration, feed in my old events -> and store the session it a database.
When retrieving the session, I  can set realtime clock in the configuration with JPAKnowledgeService.loadStatefulKnowledgeSession().

As I am not really interested in storing the sessions, I use an in-memory db like in the documentation (3.3.10. Persistence and Transactions)

@Project Team:
The documentation (Chapter 3.3.10 / Drools 5.5.0) is really outdated, e.g.  the package references in persistence.xml are not correct any more .
Also it seems to be a full example, but missing location of files (where to put persistence.xml) and information about general configuration of hibernate and bitronix. (I can see why you omitted it, but it would be helpful)

I also don't get why it is impossible to do the same with the SerializeMarshallingStrategy -> I am pretty sure that the UnMarshaller also internally sets a new clock configuration and it would be a great feature, if this could be exposed to let developers set their own clock as required.

Cheers, Alex

On 25.09.2013, at 06:59, Wolfgang Laun <wolfgang.laun@gmail.com> wrote:

> Setting the clock is a session configuration option, which means that
> it has to be set at session instantiation time.
>
> You might try to continue to use the pseudo-clock until you have finished
> the replay and mimick the realtime clock with it, although it might need
> some experimenting to learn when and how to advance the pseudo-clock:
> before and/or after insertions, every n ms,...
>
> -W
>
> On 24/09/2013, amarok <mail@alexander-wolf.net> wrote:
>> I am still stuck with this. Is there any way to replay events into a
>> session
>> and then getting into realtime mode?
>>
>>
>> amarok wrote
>>> Drools 5.5
>>>
>>> Hey guys,
>>>
>>> Is it possible to replace the session clock of an existing stateful
>>> knowledge session (STREAM mode) while it is running or at least by
>>> pausing
>>> and restarting it?
>>> I need to feed old events into the session to restore a certain session
>>> state before switching the sessions to "realtime" mode and continue with
>>> new incoming events...
>>>
>>> A code snippet would make me very happy ;)
>>>
>>> - Alex
>>> _______________________________________________
>>> rules-users mailing list
>>
>>> rules-users@.jboss
>>
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>>
>>
>>
>> --
>> View this message in context:
>> http://drools.46999.n3.nabble.com/rules-users-replace-session-clock-at-runtime-tp4026090p4026112.html
>> Sent from the Drools: User forum mailing list archive at Nabble.com.
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--

  Edson Tirelli
  Principal Software Engineer 

  Red Hat Business Systems and Intelligence Group

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