Poll an export job until ready

Coordinate a resumable export-job polling lifecycle with explicit pause and cancellation controls.

MediumReact Async State

50 min0% acceptance

Description

Build ExportJobPoller around injected start, status, and cancellation operations. Start one export job, poll without overlapping requests, pause and resume the same job, reveal its download URL when ready, and cancel both scheduled and in-flight work safely.

Requirements

Export an ExportJobPoller component from src/App.tsx.
Invoke startExport once for a polling lifecycle and retain the returned job ID.
Never allow two getStatus requests for the same job to overlap.
Pause cancels the scheduled poll and prevents another status request.
Resume continues polling the existing job instead of starting a replacement job.
A ready status stops polling and exposes an accessible download link.
Cancel stops scheduled and in-flight work and invokes cancelExport for the active job once.
Unmounting cancels the scheduler and aborts any active start or status request.

Pause and resume

Input

Pause while job exp-7 is processing, then Resume

Expected output

No polls run while paused and polling resumes for exp-7

Explanation

Resuming must not create a second export.

Ready result

Input

A status poll returns ready with /exports/exp-7.csv

Expected output

Polling stops and a Download export link appears

Explanation

Terminal states clear scheduled work.

Constraints

Use scheduler.schedule rather than global timers
Poll only non-terminal jobs
Keep pause distinct from cancellation

Hints

Hint 1

Store the job ID independently from the current polling state.

Hint 2

Schedule the next poll only after the current request settles.

Hint 3

Route pause, ready, cancel, and unmount through one cleanup function.

Reactpollingcancellation