Hi
We have two requirement:
1. Send *User based notification* to UI for some
Processing/operation(performed by User). Notifications for Operation will
be like(Started, In Progress,Completed)
2. Read messages/*User based notification* from RabbitMQ .Save these
messages in DB and then send *User based notification to UI*
*Technology *: *Server sent events was chosen* over short,long Polling and
WebSockets
We are using *Akka Streaming along with Play framework *to implement
SSE.(Scala(2.11/2.12)
with Play framework(2.6.x). Library: *akka.stream.scaladsl.Source*)
We have written below code to add notifications in Queue. Now we want to
push these notifications on UI
object NotficationUtil {
var userNotificationMap = Map[Integer, Queue[String]]()
def addUserNotification(userId: Integer, message: String) = {
var queue = userNotificationMap.getOrElse(userId, Queue[String]())
queue += message
userNotificationMap.put(userId, queue)
}
}
*Issue: Not sure which type of source should be created . Because as soon
as all elements in source has been pushed to UI, event streams got
closed. *
*And in our use case , Queue or any collection will be empty if there are
no messages to be pushed from Rabbit MQ or user has not performed some X
operation.*
Question 1: Is *SSE valid USE CASE for our scenario*?
Question 2: If SSE is valid for our scenario*,how can we create **stream
that will be infinite( and connection will remain open) and will be closed
only my session is logged off or we can explicitly close it*.
Question 3: If we cannot *create infinite stream when s**erver does not
have anything *for hours then if *browser trying to reestablish connection
**every
second will it be an overkill or Is this an acceptable solution in
industry?*
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