Re: [rules-users] replace session clock at runtime

Reading your answer again I just realized that you did not recommend to write my own clock implementation. Therefore you may just ignore that question.

I am still curious what PR stands for though. Alex On 30.09.2013, at 17:44, Alexander Wolf <mail(a)alexander-wolf.net&gt; wrote: > > 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(a)gmail.com&gt; 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(a)alexander-wolf.net&gt; >> 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 The documentation (Chapter 3.3.10 / Drools 5.5.0) is really outdated, 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(a)gmail.com&gt; 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(a)alexander-wolf.net&gt; 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-ru... >> >> Sent from the Drools: User forum mailing list archive at Nabble.com. >> >> _______________________________________________ >> >> rules-users mailing list >> >> rules-users(a)lists.jboss.org >> >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> >> > _______________________________________________ >> > rules-users mailing list >> > rules-users(a)lists.jboss.org >> > https://lists.jboss.org/mailman/listinfo/rules-users >> >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> >> >> -- >> Edson Tirelli >> Principal Software Engineer >> Red Hat Business Systems and Intelligence Group >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >