Hi all,
I am working on a video recoding application with Akka and I have a bunch
of actors which share a bit of information, namely how to start a recording.
There are different ways of starting a recording, so I use a base trait and
specific case classes.
For example:
sealed trait StartRecording
/** Start recording at a given date*/
case class StartRecordingByDate(date: Long) extends StartRecording
/** Start recording straight away*/
case object StartRecordingStraightAway extends StartRecording
I want to be able to mutate how a recording start (i.e. update the start
time, or even better change the start record mode), so I was thinking of
using an Agent[StartRecording]. However, Agents are invariant so this does
not really work.
One option is was thinking about is to have a wrapper and create an agent
for that wrapper, like so:
case class Wrapper(wrapped: StartRecording)
val agent = Agent(Wrapper(StartRecordingStraighAway))
This compiles and work, but I am wondering if it is a good idea or if there
is a better way.
Guillaume.
PS: Here is a working code example:
package org.kafecho.learning.akka
import akka.actor.ActorSystem
import akka.agent.Agent
object AgentTest extends App{
sealed trait StartRecording
/** Start recording at a given date*/
case class StartRecordingByDate(date: Long) extends StartRecording
/** Start recording straight away*/
case object StartRecordingStraightAway extends StartRecording
implicit val system = ActorSystem("Agents")
val agent = Agent(StartRecordingStraightAway)
// This does not compile
//agent.update(StartRecordingByDate(System.currentTimeMillis() + 1000))
case class Wrapper(startRecording: StartRecording)
// This compiles, but is it a good idea?
val agent2 = Agent(Wrapper(StartRecordingStraightAway))
agent2.update(Wrapper(StartRecordingByDate(System.currentTimeMillis() + 1000
)))
}
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