tkrmagid de723fd0b4 v0.4.18: fix /videoCache clear vs in-flight download race ...

clearAll() previously only wiped finalized files + the IN_FLIGHT set; any
download that was already running on the single-thread executor kept
writing past the clear, then atomically moved its .part to final and
re-published into READY — resurrecting one cache entry post-clear.

Fix: add an AtomicLong CACHE_EPOCH. preload() captures the epoch at submit
time; clearAll() bumps the epoch BEFORE wiping disk; download(url, epoch)
checks at three points (pre-start, in read loop, pre-publish) and bails if
the epoch moved, deleting its own .part only AFTER closing the output
stream (Windows can't delete an open file).

Phase ordering in clearAll() also matters: bump epoch first → drop
indexes → delete files. That way the in-flight download sees the
cancellation flag before the index wipe / file delete races can interact
with it.

2026-05-16 22:48:16 +09:00

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