Well, a GraphStage has a shape which you can define. If you define your GraphStage to have an Outlet but no Inlet then it obviously becomes a Source, right? By Source.fromGraph(..your GraphStage ..) you can convert it into a Source.
BR, Felix > Am 06.11.2019 um 19:11 schrieb Bishnu Shankar Pandey > <[email protected]>: > > Hi Felix, > Thank you for the response. I went through the link that you have shared with > me. But in the documentation, I saw that the queue is used as a flow in the > example. But in my use case, I want to use the queue as an Akka stream source > and then send it to an actor. It will be very helpful for me if you will just > write a code snippet on how to implement that. > > Regards, > Bishnu > > On Wednesday, November 6, 2019 at 8:54:50 PM UTC+5:30, Felix Nensa wrote: > You could wrap your queue in a GraphStage, which will give you a lot of > flexibility. > There are a lot of good examples (include some with queues) at > https://doc.akka.io/docs/akka/current/stream/stream-customize.html#custom-processing-with-graphstage > > > BR, Felix > > > Am 06.11.2019 um 16:14 schrieb Bishnu Shankar Pandey > > <[email protected]>: > > > > Hi All, > > My use case is I want to create an Akka stream in which the source is a > > java Queue. The stream should keep on the pooling values from the queue and > > if the queue is empty then wait for the values in the queue. Akka stream > > queue is another option but if in case of any failure I want to store the > > values that are there in the queue (I don’t know how to do that with Akka > > stream Queue). I tried the following: > > > > val source: Source[String > > , NotUsed] = Source.from(queue) > > source.ask( > > 1, actor, classOf[String], 10 > > seconds).runWith(Sink.ignore(), mat) > > > > I tried setting idleTimeOut and keepAlive properties but they are not > > working. The stream goes to the Done state if there are no values in the > > queue. > > > > > > > > > > > > Regards, > > > > Bishnu > > > > > > -- > > ***************************************************************************************************** > > > > ** New discussion forum: https://discuss.akka.io/ replacing akka-user > > google-group soon. > > ** This group will soon be put into read-only mode, and replaced by > > discuss.akka.io > > ** More details: > > https://akka.io/blog/news/2018/03/13/discuss.akka.io-announced > > ***************************************************************************************************** > > > > >>>>>>>>>> > > >>>>>>>>>> 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 [email protected]. > > To view this discussion on the web visit > > https://groups.google.com/d/msgid/akka-user/7b86524e-a5a1-4eca-9a7b-44377c122dff%40googlegroups.com. > > > > > > > > -- > ***************************************************************************************************** > ** New discussion forum: https://discuss.akka.io/ replacing akka-user > google-group soon. > ** This group will soon be put into read-only mode, and replaced by > discuss.akka.io > ** More details: > https://akka.io/blog/news/2018/03/13/discuss.akka.io-announced > ***************************************************************************************************** > >>>>>>>>>> > >>>>>>>>>> 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 [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/akka-user/30390583-e53d-4345-af9e-d706aec7bf43%40googlegroups.com. -- PD Dr. Felix Nensa Auf’m Stöcken. 7 D-45257 Essen Germany mail: [email protected] mobile: +49 171 958 51 40 https://twitter.com/FelixNensa -- ***************************************************************************************************** ** New discussion forum: https://discuss.akka.io/ replacing akka-user google-group soon. ** This group will soon be put into read-only mode, and replaced by discuss.akka.io ** More details: https://akka.io/blog/news/2018/03/13/discuss.akka.io-announced ***************************************************************************************************** >>>>>>>>>> >>>>>>>>>> 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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