But, if I implement supervisor, I have to return restart, stop or escalate right. On 01-Jul-2014 7:40 PM, "√iktor Ҡlang" <viktor.kl...@gmail.com> wrote:
> If you don't want to restart the child you'll want to catch the exception > and send another response to the sender. > > > On Tue, Jul 1, 2014 at 4:05 PM, Yadukrishnan K <yadava...@gmail.com> > wrote: > >> If any exception happened, say SQL Exception, I would like to return a >> message, like "SOME_ERROR", so that the caller understand that some problem >> occurred and show relevant message. Currently, when an exception occurs, >> sender().tell() will not execute due to exception and Future Timeout >> happens. >> >> Is my method not correct ? >> >> >> >> >> On Tuesday, July 1, 2014 7:30:58 PM UTC+5:30, √ wrote: >> >>> send message where? >>> >>> http://doc.akka.io/docs/akka/2.3.4/scala/fault-tolerance.html >>> >>> >>> On Tue, Jul 1, 2014 at 3:58 PM, Yadukrishnan K <yada...@gmail.com> >>> wrote: >>> >>>> Using supervisor, I will be able to restart the failed actor, using >>>> restart(), stop() etc right? >>>> But Can I send message ? >>>> >>>> Can you please point me to a sample code for my case? I am really >>>> getting confused with this. >>>> >>>> >>>> On Tuesday, July 1, 2014 7:15:19 PM UTC+5:30, √ wrote: >>>> >>>>> Execute the SQL in a newly created child-actor and use supervision to >>>>> deal with the exception? >>>>> >>>>> >>>>> On Tue, Jul 1, 2014 at 3:43 PM, Yadukrishnan K <yada...@gmail.com> >>>>> wrote: >>>>> >>>>>> Thanks for the quick reply. >>>>>> >>>>>> But how do I handle the Exceptions at a common place instead of >>>>>> try-catch in each of the actors? (like SQL Exceptions ) >>>>>> >>>>>> >>>>>> >>>>>> On Tuesday, July 1, 2014 6:48:17 PM UTC+5:30, √ wrote: >>>>>> >>>>>>> I'd recommend against using Exceptions for validation. The >>>>>>> non-existence of an Employee is a natural thing given an arbitrary >>>>>>> id—it is >>>>>>> not exceptional. >>>>>>> >>>>>>> >>>>>>> On Tue, Jul 1, 2014 at 3:08 PM, Yadukrishnan K <yada...@gmail.com> >>>>>>> wrote: >>>>>>> >>>>>>>> So do I have to do it in each of the actors ? >>>>>>>> Is there any other way to handle it in a central place? For ex: in >>>>>>>> Spring MVC, all the exceptions thrown from the controller can be >>>>>>>> handled >>>>>>>> using @ControllerAdvice. Just looking if there is any similar thing. >>>>>>>> >>>>>>>> Not just this, I want to handle any SQLExceptions like Constraint >>>>>>>> Violation and return a meaningful message to the caller. For that >>>>>>>> also, I >>>>>>>> need to use try-catch in each of the actors and send corresponding >>>>>>>> message ? >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Tuesday, July 1, 2014 6:27:42 PM UTC+5:30, Yadukrishnan K wrote: >>>>>>>>> >>>>>>>>> I am a newbie to akka actor system. I am developing an application >>>>>>>>> using Java, Spring, Hibernate and Akka. >>>>>>>>> I am having problems with exception handling. >>>>>>>>> >>>>>>>>> My scenario is given below : >>>>>>>>> >>>>>>>>> REST API --> Spring MVC --> Service Layer (Actor) --> Hibernate >>>>>>>>> Repository. >>>>>>>>> Assume that I am trying to find an employee with id 1. >>>>>>>>> >>>>>>>>> Employee emp = HibernateRepository.findById(Employee.class, id); >>>>>>>>> sender().tell(emp, self()); >>>>>>>>> >>>>>>>>> If the employee with id=1 doesn't exist, the emp object will be >>>>>>>>> NULL and sending NULL as message will throw InvalidMessageException. >>>>>>>>> Is it possible to handle this exception and throw a custom >>>>>>>>> Exception to the caller, say NoEntityFoundException? This help me to >>>>>>>>> check >>>>>>>>> if the result I obtained is of Employee or CustomException. >>>>>>>>> Currently, I am >>>>>>>>> getting Future timeout only. >>>>>>>>> >>>>>>>>> I have a BaseActor which extends akka.actor.AbstractActor. I also >>>>>>>>> have another class, BaseModuleActor which extends BaseActor, as shown >>>>>>>>> below. >>>>>>>>> >>>>>>>>> public class BaseModuleActor extends BaseActor { >>>>>>>>> >>>>>>>>> public <T> ActorRef getActorRef(ActorSystem system,Class<T> >>>>>>>>> clazz){ >>>>>>>>> return system.actorOf( >>>>>>>>> SpringExtension.SpringExtProvider.get(system). >>>>>>>>> props(clazz)); >>>>>>>>> } >>>>>>>>> } >>>>>>>>> >>>>>>>>> All my actors are extending this actor, where I am doing like below >>>>>>>>> >>>>>>>>> @Override >>>>>>>>> public PartialFunction<Object, BoxedUnit> receive(){ >>>>>>>>> return ReceiveBuilder >>>>>>>>> .match(Long.class, id-> getEmployeeById(id)) >>>>>>>>> .build() >>>>>>>>> .orElse(matchAny()); >>>>>>>>> } >>>>>>>>> private void getEmployeeById(Long id){ >>>>>>>>> Employee emp = HibernateRepository.findById(Employee.class, >>>>>>>>> id); >>>>>>>>> sender().tell(emp, self()); >>>>>>>>> } >>>>>>>>> >>>>>>>>> >>>>>>>>> But I am now stuck with handling the exceptions at a common place >>>>>>>>> using the supervisor strategy. >>>>>>>>> How can I catch the InvalidMessageException and resends some >>>>>>>>> meaningful message to the caller. Is it possible? >>>>>>>>> >>>>>>>>> >>>>>>>>> Regards, >>>>>>>>> Yadu >>>>>>>>> >>>>>>>> -- >>>>>>>> >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>> >>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/c >>>>>>>> urrent/additional/faq.html >>>>>>>> >>>>>>>>>> Search the archives: https://groups.google.com/grou >>>>>>>> p/akka-user >>>>>>>> --- >>>>>>>> You received this message because you are subscribed to the Google >>>>>>>> Groups "Akka User List" group. >>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>> send an email to akka-user+...@googlegroups.com. >>>>>>>> To post to this group, send email to akka...@googlegroups.com. >>>>>>>> >>>>>>>> Visit this group at http://groups.google.com/group/akka-user. >>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> Cheers, >>>>>>> √ >>>>>>> >>>>>> -- >>>>>> >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>> >>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/c >>>>>> urrent/additional/faq.html >>>>>> >>>>>>>>>> Search the archives: https://groups.google.com/grou >>>>>> p/akka-user >>>>>> --- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "Akka User List" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to akka-user+...@googlegroups.com. >>>>>> To post to this group, send email to akka...@googlegroups.com. >>>>>> Visit this group at http://groups.google.com/group/akka-user. >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> Cheers, >>>>> √ >>>>> >>>> -- >>>> >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>> >>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/ >>>> current/additional/faq.html >>>> >>>>>>>>>> Search the archives: https://groups.google.com/ >>>> group/akka-user >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "Akka User List" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to akka-user+...@googlegroups.com. >>>> To post to this group, send email to akka...@googlegroups.com. >>>> Visit this group at http://groups.google.com/group/akka-user. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> >>> >>> -- >>> Cheers, >>> √ >>> >> -- >> >>>>>>>>>> Read the docs: http://akka.io/docs/ >> >>>>>>>>>> Check the FAQ: >> http://doc.akka.io/docs/akka/current/additional/faq.html >> >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user >> --- >> You received this message because you are subscribed to the Google Groups >> "Akka User List" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to akka-user+unsubscr...@googlegroups.com. >> To post to this group, send email to akka-user@googlegroups.com. >> Visit this group at http://groups.google.com/group/akka-user. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Cheers, > √ > > -- > >>>>>>>>>> Read the docs: http://akka.io/docs/ > >>>>>>>>>> Check the FAQ: > http://doc.akka.io/docs/akka/current/additional/faq.html > >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user > --- > You received this message because you are subscribed to a topic in the > Google Groups "Akka User List" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/akka-user/b2UOYVAXljw/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > akka-user+unsubscr...@googlegroups.com. > To post to this group, send email to akka-user@googlegroups.com. > Visit this group at http://groups.google.com/group/akka-user. > For more options, visit https://groups.google.com/d/optout. > -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are subscribed to the Google Groups "Akka User List" group. 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