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class Master < Concurrent::Actor::RestartingContext
def initialize
# create listener a supervised child of master
@listener = Listener.spawn(name: 'listener1', supervise: true)
end
def on_message(msg)
command, *args = msg
case command
when :listener
@listener
when :reset, :terminated, :resumed, :paused
log(DEBUG) { " got #{msg} from #{envelope.sender}"}
else
pass
end
end
# TODO this should be a part of a behaviour, it ensures that children are restarted/paused etc. when theirs parents are
def on_event(event)
event_name, _ = event
case event_name
when :resetting, :restarting
@listener << :terminate!
when Exception, :paused
@listener << :pause!
when :resumed
@listener << :resume!
end
end
end #
class Listener < Concurrent::Actor::RestartingContext
def initialize
@number = (rand() * 100).to_i
end
def on_message(msg)
case msg
when :number
@number
else
pass
end
end
end #
master = Master.spawn(name: 'master', supervise: true)
listener = master.ask!(:listener)
listener.ask!(:number)
# crash the listener which is supervised by master, it's restarted automatically reporting a different number
listener.tell(:crash)
listener.ask!(:number)
master << :crash
sleep 0.1
# ask for listener again, old one is terminated with master and replaced with new one
listener.ask!(:terminated?)
listener = master.ask!(:listener)
listener.ask!(:number)
master.ask!(:terminate!)
sleep 0.1
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