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aio-libs/janus ★ 968 54 APPLICATION

janus is a Python library that provides mixed sync-async queues for communication between threaded code and asyncio code. The core architecture centers on a single `Queue` class that internally manages both synchronous and asynchronous interfaces via proxy objects (`_SyncQueueProxy` and `_AsyncQueueProxy`). It uses thread-safe conditions (`threading.Condition`) for sync operations and asyncio conditions (`asyncio.Condition`) with careful cross-thread notification via `loop.call_soon_threadsafe`. The queue supports standard FIFO, LIFO (`LifoQueue`), and priority (`PriorityQueue`) variants through a template method pattern (overriding `_init`, `_put`, `_get`). Lifecycle management includes graceful and immediate shutdown with dedicated exception types (`SyncQueueShutDown`/`AsyncQueueShutDown`) compatible with Python 3.13+. The library is production-stable, has no external dependencies beyond the standard library, and is thoroughly tested across multiple Python versions and concurrency scenarios. It does not expose APIs beyond queue operations and is strictly a communication primitive.

RATING: 8.1/10 MAINT: active DRIFT: low
#queue #asyncio #threading #sync-async #python-library #concurrency #threadsafe #mypy
▸ 1 reusable components found
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