Dear Experts ,
Could you please help me with a right design choice for the following
scenario.
*Use case * : 1000's of Network device are controlled by a network .
- Network devices will join and leave the network by sending *Join* and
*Leave* messages respectively to the network controller.
*Joining scenario*
- When controller get a *Join* message from a network device ,
- it will check whether an FSM actor exists for that network device by
calling getContext().getChild("networkdevice_IP").
- "networkdevice_IP" is used to identify the actor.
- if the child lookup returns null , a new FSMActor will be spawned
and join message is processed by the new FSMActor
*Leaving scenario*
- Network device will send a *Leave* message to the controller
- controller will do getContext().getChild("networkdevice_IP") and get
the right FSMActor.
- sends “*leave* message" to this actor.
- While processing Leave message , FSM actor will terminate itself by
calling stop() .
*Complication*
- Now there is a possibility that while the stop() is being processed
by FSMActor , a new Join may come from same network device
(networkdevice_IP).
- Since stop() is asynchronous getContext().getChild(network device)
will still return the FSMActor (networkdevice_IP) , but if we send message
to this actor , the message will go to DeadMessages.
-
*Design question .*
- How to handle such scenario using AKKA ? So that we will not return
a stale Actor using getContext().getChild()
- [one possiblity might be to leave this corner scenario and let the
network protocol to handle this with retransmission .But if retransmission
is not there what to do ?]
With thanks and regards
Mahesh
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