58 lines
1.6 KiB
Markdown
58 lines
1.6 KiB
Markdown
# System Sequence Diagram
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## Metadata
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| Key | Value |
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| --- | --- |
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| ID | SSD-001 |
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| CrossReference | [UC-001] |
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| Language | en |
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| Domain | it |
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## Version History
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| Date | Status | Author | Reviewer | Change | Commit |
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| --- | --- | --- | --- | --- | --- |
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| 2026-10-13 | Accepted | Jens Tirsvad Nielsen | AI as stand-in for S01 | Initial version | pending |
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---
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## Source Use Case
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Count squirrels by fur colour ([UC-001]) — scenario: main success scenario. The alternate flow 1a (census file missing) is the second diagram; flow 2a has no system message of its own.
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## Diagram
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```plantuml
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@startuml
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actor Participant as A
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participant ":System" as S
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A -> S : countByFurColor(censusFile, summaryFile)
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S --> A : summary
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@enduml
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```
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```plantuml
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@startuml
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actor Participant as A
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participant ":System" as S
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A -> S : countByFurColor(censusFile, summaryFile)
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S --> A : censusFileMissing
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@enduml
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```
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## System Operations
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| Step | Message | Parameters | Return | Use case step |
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| --- | --- | --- | --- | --- |
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| 1 | countByFurColor | censusFile, summaryFile | summary (colour count of each fur colour) | 1 (input), 2 (count), 3 (write), 4 (shown to the participant) |
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| 1a | countByFurColor | censusFile, summaryFile | censusFileMissing | 1a |
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Steps 2 to 4 of the use case are the work of the system inside one operation: the system receives one message and returns one result, so one message covers steps 1 to 4.
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## Lifecycle Notes
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The system instance lives for one run of the program; nothing is kept between runs.
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---
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[UC-001]: ./uc.md
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