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sofarr/docs/diagrams/state-poller.puml
Gronod e97bd3c67b docs: comprehensive architecture documentation with PlantUML diagrams
- docs/ARCHITECTURE.md: full system overview, technology stack, directory
  structure, component architecture, data flow, auth, polling/caching,
  download matching pipeline, API reference, frontend architecture,
  configuration, deployment guide
- docs/diagrams/component.puml: system component diagram
- docs/diagrams/seq-auth.puml: authentication sequence diagram
- docs/diagrams/seq-dashboard.puml: dashboard request sequence diagram
- docs/diagrams/seq-polling.puml: background polling cycle sequence
- docs/diagrams/class-server.puml: server-side class/module diagram
- docs/diagrams/class-data.puml: data model / entity diagram
- docs/diagrams/state-ui.puml: frontend UI state diagram
- docs/diagrams/state-poller.puml: poller state diagram
- docs/diagrams/activity-matching.puml: download matching activity diagram
2026-05-16 00:32:16 +01:00

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@startuml state-poller
!theme plain
title sofarr — Poller State Diagram
[*] --> CheckConfig : startPoller()
state CheckConfig <<choice>>
CheckConfig --> Disabled : POLL_INTERVAL = 0\nor 'off' / 'false'
CheckConfig --> Idle : POLL_INTERVAL > 0
state Disabled {
state "On-demand mode\nNo background timer" as od
od : Data fetched only when\na dashboard request\nfinds empty cache
}
Disabled --> Polling : pollAllServices()\n(triggered by dashboard request)
Polling --> Disabled : Poll complete\n(return to on-demand)
state Idle {
state "Waiting for\nnext interval" as waiting
}
Idle --> Polling : setInterval fires\nor immediate first poll
state Polling {
state "polling = true" as lock
state "Fetching all services\n(Promise.all)" as fetching
state "Storing results\nin cache" as storing
state "Recording timings" as timing
[*] --> lock
lock --> fetching
fetching --> storing : All promises resolved
fetching --> ErrorState : Any individual service\nerror (caught per-service)
storing --> timing
timing --> [*] : polling = false
}
state ErrorState as "Handle Error" {
state "Log error\npolling = false" as err
}
ErrorState --> Idle : Next interval
Polling --> Idle : Poll complete\n(back to waiting)
state "Concurrent Poll\nAttempt" as skip {
state "polling === true\n→ skip" as sk
}
Idle --> skip : Interval fires while\nprevious still running
skip --> Idle : Log "still running,\nskipping"
note right of Polling
**Cache TTL**: POLL_INTERVAL × 3
Ensures data survives between polls
even if one cycle is slow.
end note
note right of Disabled
**Cache TTL**: 30000ms (30s)
After expiry, next dashboard
request triggers a fresh poll.
end note
@enduml