Use NIOFileSystem

[adam-fowler]

I've set this as a draft for the moment as while NonBlockingFileIO has been deprecated, NIOFileSystem still has an under bar prefix which indicates it has an unstable API.

[github-actions]

✅ Pull request no significant performance differences ✅

Summary

New baseline 'pull_request' is WITHIN the 'main' baseline thresholds.

Full Benchmark Comparison

Comparing results between 'main' and 'pull_request'

Host '181c3786eaa0' with 4 'x86_64' processors with 15 GB memory, running:
#18~24.04.1-Ubuntu SMP Sat Jun 28 04:46:03 UTC 2025

Router

Router:Echo metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	769	769	769	769	769	769	769	1026
pull_request	769	769	769	769	769	769	769	1035
Δ	0	0	0	0	0	0	0	9
Improvement %	0	0	0	0	0	0	0	9

Router:GET metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	468	468	468	468	468	468	468	2915
pull_request	468	468	468	468	468	468	468	2947
Δ	0	0	0	0	0	0	0	32
Improvement %	0	0	0	0	0	0	0	32

Router:Middleware metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	373	373	373	373	373	373	373	2726
pull_request	373	373	373	373	373	373	373	2682
Δ	0	0	0	0	0	0	0	-44
Improvement %	0	0	0	0	0	0	0	-44

Router:PUT metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	1272	1272	1272	1272	1272	1272	1272	801
pull_request	1272	1272	1272	1272	1272	1272	1272	791
Δ	0	0	0	0	0	0	0	-10
Improvement %	0	0	0	0	0	0	0	-10

Router:Parameters metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	718	718	718	718	718	718	718	2419
pull_request	718	718	718	718	718	718	718	2440
Δ	0	0	0	0	0	0	0	21
Improvement %	0	0	0	0	0	0	0	21

RouterBuilder:Middleware metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	372	372	372	372	372	372	372	2770
pull_request	372	372	372	372	372	372	372	2799
Δ	0	0	0	0	0	0	0	29
Improvement %	0	0	0	0	0	0	0	29

TrieRouter:LongPaths metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	11	11	11	11	11	11	11	244
pull_request	11	11	11	11	11	11	11	242
Δ	0	0	0	0	0	0	0	-2
Improvement %	0	0	0	0	0	0	0	-2

TrieRouter:Parameters metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	19	19	19	19	19	19	19	184
pull_request	19	19	19	19	19	19	19	186
Δ	0	0	0	0	0	0	0	2
Improvement %	0	0	0	0	0	0	0	2

TrieRouter:Routing metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	13	13	13	13	13	13	13	238
pull_request	13	13	13	13	13	13	13	236
Δ	0	0	0	0	0	0	0	-2
Improvement %	0	0	0	0	0	0	0	-2

[codecov]

Codecov Report

❌ Patch coverage is 83.87097% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.22%. Comparing base (b4f73eb) to head (313ee30).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/Hummingbird/Files/FileIO.swift	79.16%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #655      +/-   ##
==========================================
- Coverage   84.30%   84.22%   -0.09%     
==========================================
  Files         117      117              
  Lines        7716     7695      -21     
==========================================
- Hits         6505     6481      -24     
- Misses       1211     1214       +3     

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