I have an actor with the next behaviour. When i stash commands, they never
go back to mailbox.
Use versions *"akka-actor-typed"* and *"akka-persistence-typed"* 2.5.16
object Blog {
//#event
sealed trait BlogEvent
extends Serializable
final case class PostAdded(postId: String, content: PostContent)
extends BlogEvent
//#event
//#state
object BlogState {
val empty = BlogState(None)
}
final case class BlogState(content: Option[PostContent]) {
def withContent(newContent: PostContent): BlogState =
copy(content = Some(newContent))
def isEmpty: Boolean = content.isEmpty
def postId: String = content match {
case Some(c) ⇒ c.postId
case None ⇒ throw new IllegalStateException("postId unknown
before post is created")
}
}
//#state
//#commands
sealed trait BlogCommand
extends Serializable
final case class AddPost(content: PostContent, replyTo: ActorRef[
AddPostDone]) extends BlogCommand
final case class Accumulate(num: Int)
extends BlogCommand
final case class AddPostDone(postId: String)
final case class PostContent(postId: String, title: String, body:
String)
//#commands
def behavior: Behavior[BlogCommand] =
Behaviors.setup[BlogCommand] { ctx ⇒
val buffer = StashBuffer[BlogCommand](capacity = 1000)
//#initial-command-handler
val initial
: (ActorContext[BlogCommand], BlogState, BlogCommand) ⇒ Effect[
BlogEvent, BlogState] =
(ctx, state, cmd) ⇒
cmd match {
case AddPost(content, replyTo) ⇒
Effect
.persist(PostAdded(content.postId, content))
.thenRun { state2 ⇒
replyTo ! AddPostDone(content.postId)
buffer.unstashAll(ctx, this.behavior)
}
case a @ Accumulate(_) =>
buffer.stash(a)
Effect.none
case _ ⇒
Effect.unhandled
}
//#initial-command-handler
//#post-added-command-handler
val postAdded
: (ActorContext[BlogCommand], BlogState, BlogCommand) ⇒ Effect[
BlogEvent, BlogState] = {
(ctx, state, cmd) ⇒
cmd match {
case _: AddPost ⇒
Effect.unhandled
case Accumulate(num) ⇒
println(s"********Accumulate: $num**********")
Effect.none
case c ⇒
Effect.unhandled
}
}
//#post-added-command-handler
//#by-state-command-handler
val commandHandler
: (ActorContext[BlogCommand], BlogState, BlogCommand) ⇒ Effect[
BlogEvent, BlogState] =
CommandHandler.byState {
case state if state.isEmpty ⇒
initial
case state if !state.isEmpty ⇒
postAdded
}
//#by-state-command-handler
//#event-handler
val eventHandler: (BlogState, BlogEvent) ⇒ BlogState = { (state,
event) ⇒
event match {
case PostAdded(postId, content) ⇒
state.withContent(content)
}
}
//#event-handler
//#behavior
PersistentBehaviors.receive[BlogCommand, BlogEvent,
BlogState](persistenceId
= "Blog",
emptyState = BlogState.empty,
commandHandler,
eventHandler)
//#behavior
}
}
I try:
val blog = system.spawn(Blog.behavior, "Typed")
blog ! Accumulate(1)
blog ! Accumulate(2)
blog ! Accumulate(3)
blog ! AddPost(PostContent("id1", "title1", "body"), typedSystem.
deadLetters)
blog ! Accumulate(4)
The commands *Accumulate(1), Accumulate(2), Accumulate(3)* were stashed in*
initial-command-handler* but when do *buffer.unstashAll(ctx, this.behavior)*
the commands are lost, they do not go back to mailbox
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