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Implement the main sync orchestration function and trigger-based queue
processing for throttled domains:
sync_identifier function:
- Orchestrates syncing git data for a single identifier
- Tries all non-throttled URLs in sequence
- Checks completion after each fetch (no pending events or all OIDs fetched)
- Enqueues with throttled domains when non-throttled URLs are exhausted
- Returns true if complete, false if events remain (for backoff)
ThrottleManager enhancements:
- Add set_context() to provide SyncContext for queue processing
- Add try_process_next() to spawn tasks when capacity frees
- Add process_queued_identifier() to handle queued work
- Update complete_request() to trigger processing on completion
- Update enqueue_identifier() to trigger processing when capacity available
- Add internal methods for non-Arc testing compatibility
Generic function updates:
- Add ?Sized bound to sync_identifier_next_url, sync_identifier_from_url,
sync_identifier, and get_throttled_domains_with_untried_urls for
dynamic dispatch support (Arc<dyn SyncContext>)
Tests:
- sync_identifier_tries_multiple_urls_until_complete: verifies sequential
URL fetching until all OIDs are available
- sync_identifier_enqueues_throttled_domains_when_incomplete: verifies
throttled domains get the identifier enqueued for later processing
- has_queued_work_reflects_queue_state: verifies queue state tracking
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