codeant-ai-for-open-source[bot] commented on PR #38576:
URL: https://github.com/apache/superset/pull/38576#issuecomment-4037281974
## **Sequence Diagram**
This PR changes how dashboard thumbnail requests and Celery tasks interact
with the cache to prevent concurrent Selenium sessions for the same dashboard
by marking work as computing before enqueue and having tasks skip when a
non-stale computation is already in progress.
```mermaid
sequenceDiagram
participant User
participant DashboardAPI
participant Cache
participant ThumbnailTask
User->>DashboardAPI: Request dashboard thumbnail
DashboardAPI->>Cache: Read thumbnail cache state
alt No active computation and trigger allowed
DashboardAPI->>Cache: Set status to COMPUTING
DashboardAPI->>ThumbnailTask: Enqueue thumbnail task
DashboardAPI-->>User: Respond with pending thumbnail
else Already computing or should not trigger
DashboardAPI-->>User: Respond using existing cache state
end
ThumbnailTask->>Cache: Check thumbnail cache state
alt Status is COMPUTING and not stale
ThumbnailTask-->>ThumbnailTask: Skip thumbnail generation
else Not computing or computing is stale
ThumbnailTask-->>ThumbnailTask: Generate thumbnail and update cache
ThumbnailTask->>Cache: Store thumbnail and final status
end
```
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