Hi,
the callbacks are definitely not a good idea. The idiomatic way is sending
messages that are pure immutable data.
In your case, this means that the ExecuteOnPlayersByPosition message should
act as an envelope for another message specifying the details of the
operation.
It's not clear to me which actor tracks the positions of players. Supposing
that it's the room supervisor actor: upon reception of
ExecuteOnPlayersByPosition it filters the list of players by position and
forwards the embedded message to their respective actors. Supposing that
each player's actor tracks her own position, room supervisor forwards
ExecuteOnPlayersByPosition verbatim to all players in the room, and
player's actor checks the envelope and if position matches sends the
extracted command to self, otherwise ignores the message.
Cheers,
Rafał
W dniu środa, 2 listopada 2016 14:18:43 UTC+1 użytkownik Steve Winfield
napisał:
>
> Hey,
>
> I got a question regarding a project I'm working on.
>
> There are player actors that can be managed by a "player director" actor
> which belongs to a virtual room and supervises the players. A player
> maintains its current position and name as a mutable state.
>
> The director looks like this:
>
> class PlayerDirector extends Actor {
> ....
> private val players = mutable.Map[Int, ActorRef]() // Id, Player ref
> ....
> override def receive = {
> case SpawnPlayer(playerReference) => players +=
> (incrementAndGetId() -> context.actorOf(Player.props(playerReference)))
> case RemovePlayer(id) => ...
> }
> }
>
>
> Now I'd like to execute some operations on all players which are
> positioned at x, y
>
> My first attempt:
>
> class PlayerDirector ...
> receive = {
> ....
> case ExecuteOnPlayersByPosition(position, callback) => {
> for ((id, player) <- players) {
> player ! ExecuteIfPositionMatches(position, callback)
> }
> }
> ....
>
>
> Then, the player would check its position and execute the callback from
> its context. I don't like this implementation because it forces me to have
> the callback executed on the player's actor, but It's the only way to
> guarantee synchronization (I guess).
>
> Do you have any advice for me?
>
> Cheers!
>
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