add timeout sequence diagram

UML/timeout.puml

@@ -0,0 +1,62 @@
+@startuml
+
+participant "Behavior::StateMachine" as sm
+participant Dispatcher as d
+participant TimeoutManager as tm
+entity "Event::Timeout" as t
+queue "TimeoutManager::timeouts_" as timeouts
+
+autoactivate off
+|||
+|||
+== Schedule timeout ==
+|||
+sm -> sm++ : scheduleTimeout
+sm -> d ++: getDispatcher
+d --> sm --: dispatcher
+sm -> d --++ : scheduleTimeout
+d -> tm ++: getTimeoutManager
+tm --> d --: timeoutManager
+d -> tm --++ : scheduleTimeout
+tm -> t ** : new
+t --> tm
+tm -> timeouts --++: insert
+
+|||
+|||
+== Decrement timeout (and dispatch) ==
+|||
+loop every tickInterval
+?->> tm ++: tick
+tm -> timeouts : getFront
+timeouts -> t ++
+t --> timeouts
+timeouts --> tm : timeout
+tm -> t  --: decrement
+end
+|||
+note left t
+When timeout is 0,
+dispatch event
+end note
+t -> timeouts : pop
+deactivate timeouts
+t ->? --: pushEvent
+
+|||
+|||
+== Unschedule timeout ==
+|||
+sm -> sm++ : unscheduleTimeout
+sm -> d ++: getDispatcher
+d --> sm --: dispatcher
+sm -> d --++ : unscheduleTimeout
+d -> tm ++: getTimeoutManager
+tm --> d --: timeoutManager
+d -> tm --++ : unscheduleTimeout
+tm -> timeouts --: erase
+timeouts -> t !!
+
+
+
+@enduml