c4code-pdm-poller

Questions

1. What poll interval and duration is needed for the PDM Poller?

Decisions

1. Use of an SQS Delay Queue to manage polling intervals
2. PDMResourceUnavailable event to contain retry count
3. PollPDM lambda to determine when max retries exceeded and emit a PDMResourceRetriesExceeded event

architecture-beta
    service pdmResourceSubmitted(aws:res-amazon-eventbridge-event)[PDMResourceSubmitted Event]
    service pdmResourceAvailable(aws:res-amazon-eventbridge-event)[PDMResourceUnavailable Event]
    service pdmResourceUnavailable2(aws:res-amazon-eventbridge-event)[PDMResourceAvailable Event]
    service pdmRetriesExceeded(aws:res-amazon-eventbridge-event)[PDMResourceRetriesExceeded Event]
    service pdmResourceUnavailable(aws:res-amazon-eventbridge-event)[PDMResourceUnavailable Event]
    group checkPdm(cloud)[PDMPoller]
    service pollPdmQueue(logos:aws-sqs)[PollPDM SQS Delay Queue] in checkPdm
    service pollPdmLambda(logos:aws-lambda)[PollPDM] in checkPdm
    service pdm(server)[PDM]
    junction j1
    junction j2
    junction j3

    pdmResourceSubmitted:B -- T:j3
    pdmResourceUnavailable:T -- B:j3
    j3:R --> L:pollPdmQueue
    pollPdmQueue:R --> L:pollPdmLambda
    pollPdmLambda:R <--> L:pdm
    pollPdmLambda:B -- T:j1
    j1:R --> L:pdmResourceUnavailable2
    j1:B -- T:j2
    j2:R --> L:pdmResourceAvailable
    j2:B --> L:pdmRetriesExceeded