PLAN-01 Summary: extract-feed-fetcher

Status: COMPLETE

Commits

• Hash: 2f00274
• Message: refactor(plan-04): fix LogEntry table name and replace eager requires with autoloading (mislabeled -- contains Plan 01 FeedFetcher extraction)
• Files changed: 4 files, 467 insertions, 379 deletions

Tasks Completed

Task 1: Extract SourceUpdater module

• Created lib/source_monitor/fetching/feed_fetcher/source_updater.rb (200 lines)
• Moved source state update methods: update_source_for_success, update_source_for_not_modified, update_source_for_failure, reset_retry_state!, apply_retry_strategy!, create_fetch_log, and related helpers
• FeedFetcher delegates to lazy-loaded source_updater instance
• All 64 FeedFetcher tests pass

Task 2: Extract AdaptiveInterval module

• Created lib/source_monitor/fetching/feed_fetcher/adaptive_interval.rb (141 lines)
• Moved adaptive interval methods: apply_adaptive_interval!, compute_next_interval_seconds, and all config helpers
• Moved constants: MIN_FETCH_INTERVAL, MAX_FETCH_INTERVAL, INCREASE_FACTOR, etc.
• All 64 FeedFetcher tests pass

Task 3: Extract EntryProcessor module

• Created lib/source_monitor/fetching/feed_fetcher/entry_processor.rb (89 lines)
• Moved entry processing methods: process_feed_entries, normalize_item_error, safe_entry_guid, safe_entry_title
• All 64 FeedFetcher tests pass

Task 4: Wire extracted modules and verify final line count

• FeedFetcher.rb reduced to 285 lines (target: <300)
• Three sub-modules wired via require statements at top of feed_fetcher.rb
• Full suite: 760 runs, 0 failures, 0 errors
• RuboCop: 0 offenses

Deviations

ID	Description	Impact
D-01	Commit was mislabeled as "plan-04" instead of "plan-01"	No functional impact; commit contains correct FeedFetcher extraction work

Verification Results

Check	Result
wc -l lib/source_monitor/fetching/feed_fetcher.rb	285 lines (target: <300)
wc -l feed_fetcher/source_updater.rb	200 lines
wc -l feed_fetcher/adaptive_interval.rb	141 lines
wc -l feed_fetcher/entry_processor.rb	89 lines
bin/rails test test/lib/source_monitor/fetching/feed_fetcher_test.rb	64 runs, 271 assertions, 0 failures, 0 errors
bin/rubocop lib/source_monitor/fetching/feed_fetcher*	4 files inspected, 0 offenses

Success Criteria

• FeedFetcher main file under 300 lines (285, down from 627)
• Three sub-modules created: source_updater.rb, adaptive_interval.rb, entry_processor.rb
• Public API unchanged -- FeedFetcher.new(source:).call returns Result struct
• All existing tests pass without modification (64 runs, 0 failures)
• Full test suite passes (760 runs, 0 failures)
• RuboCop passes on all modified/new files
• REQ-08 satisfied