/
QuizForUserSharding.scala
38 lines (30 loc) · 1.27 KB
/
QuizForUserSharding.scala
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package com.oranda.libanius.server.actor
import akka.actor.{ActorRef, ActorSystem, Props}
import akka.cluster.sharding.{ClusterSharding, ClusterShardingSettings, ShardRegion}
import com.oranda.libanius.actor.QuizForUserActor
import com.oranda.libanius.actor.QuizMessages._
import com.oranda.libanius.model.Quiz
import com.oranda.libanius.server.ConfExtra
object QuizForUserSharding {
def startQuizForUserSharding(system: ActorSystem, quiz: Quiz): ActorRef = {
ClusterSharding(system).start(
typeName = "QuizForUser",
entityProps = Props(new QuizForUserActor(quiz)),
settings = ClusterShardingSettings(system),
extractEntityId = extractEntityId,
extractShardId = extractShardId
)
}
val extractEntityId: ShardRegion.ExtractEntityId = {
case qc: QuizMessage => (qc.userId.toString, qc)
}
// Assumes there are about 10 times more shards than the maximum planned amount of nodes
val extractShardId: ShardRegion.ExtractShardId = {
def computeShardId(entityId: ShardRegion.EntityId): ShardRegion.ShardId =
(math.abs(entityId.hashCode()) % ConfExtra.maxNumShards).toString
{
case quizCommand: QuizMessage => computeShardId(quizCommand.userId.toString)
case ShardRegion.StartEntity(id) => computeShardId(id)
}
}
}