Enhance Job Management, Optimize Queries, and Introduce Thread-Safe Features

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New Features

1. Thread Safety Enhancements

   • Implemented concurrently method in ApplicationWorker to limit concurrent jobs (e.g., UploadWorker is limited to 2 concurrent jobs).
   • Added Backgrounder for managing jobs, providing a centralized job management approach.

2. Serialization and Scope Addition

   • Introduced serialize :segment_map in DiskTitle to store structured data as JSON.
   • Added a scope :sort_by_segment_map to sort DiskTitle by its segment_map.

3. Enhanced Listeners

   • Created MkvDiskLoadListener and integrated it into services like CreateDisksService and workers such as LoadDiskWorker.

4. Service Layer Enhancements

   • Introduced a listener option in CreateDisksService for flexible subscription handling.

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Improvements

1. Database Query Optimizations

   • Used .includes in multiple components and controllers to reduce N+1 query issues:
     • Added preloads for related models like Video, DiskTitles, and Episodes.
     • Modified query scopes for MoviesController, SeasonsController, and TvsController to use .includes for related associations.
   • Optimized uploaded_recently_video_blobs and uploadable_video_blobs in UploadProcessComponent.

2. Job Handling

   • Replaced Job.sort_by_created_at.active.find_by calls with Backgrounder.managers.find for better job lookup performance.

3. Cleaner Code

   • Replaced redundant methods like find_or_initalize_disk with find_or_initialize_disk.
   • Corrected parameter names (e.g., from job: to listener: in service calls).

4. Improved UX

   • Added compact and human-readable labels using .compact_blank for DiskTitle#to_label.

5. Consistent Duration Display

   • Standardized the use of distance_of_time_in_words with explicit options for better readability in views.

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Bug Fixes

1. Typographical Errors

   • Fixed typos like segement_map to segment_map.

2. Corrected Scopes and Relations

   • Fixed incorrect method calls (e.g., episode.video_blobs.any? corrected to episode.uploaded_video_blobs.any?).
   • Corrected scope usage in components and services to ensure proper filtering and ordering.

3. Initialization and Caching Issues

   • Resolved issues with uninitialized variables by ensuring proper lazy-loading (@episode_numbers in VideoBlob).
   • Fixed caching in Job#name_constant to avoid redundant constantization.

4. Concurrency Bugs

   • Removed thread-related class variables (e.g., @@threads) in ApplicationWorker and replaced them with centralized job handling in Backgrounder.

5. Job Argument Handling

   • Ensured arguments in Job#worker are consistently symbolized to avoid errors during initialization.