nio2: NIO.2 file API companion code (streaming 5 GB at -Xmx64m, handle leaks, WatchService, mmap)

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01KqJyCidz3ZgRyHABv2GVJh
2026-09-30 19:14:31 +00:00
parent f4b732799d
commit 1ac2f6077a
30 changed files with 1072 additions and 0 deletions
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+1. create a file, write it twice, delete it (events polled afterwards):
+    ENTRY_CREATE count=1 context=a.txt
+    ENTRY_MODIFY count=2 context=a.txt
+    ENTRY_DELETE count=1 context=a.txt
+2. Files.writeString of 100 KiB to a new file (one call):
+    ENTRY_CREATE count=1 context=b.txt
+    ENTRY_MODIFY count=1 context=b.txt
+3. 50 appends to one file with no polling in between, then poll:
+    {(batches)=1, ENTRY_MODIFY=9}
+4. Files.move (atomic rename) of g.txt to h.txt:
+    ENTRY_DELETE count=1 context=g.txt
+    ENTRY_CREATE count=1 context=h.txt
+5. a file created inside a NEW subdirectory (subdirectory not registered):
+    ENTRY_CREATE count=1 context=sub
+6. burst: create N empty files in a fresh directory before polling once (jdk.nio.file.WatchService.maxEventsPerPoll=default):
+    N=100   delivered 100  events: ENTRY_CREATE=100  OVERFLOW(count)=0, files on disk=100
+    N=512   delivered 512  events: ENTRY_CREATE=512  OVERFLOW(count)=0, files on disk=512
+    N=513   delivered 1    events: ENTRY_CREATE=0    OVERFLOW(count)=1, files on disk=513
+    N=5000  delivered 1    events: ENTRY_CREATE=0    OVERFLOW(count)=4488, files on disk=5000