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Add cache purge

Signed-off-by: jolheiser <john.olheiser@gmail.com>
jolheiser 3 weeks ago
parent
commit
b1161035be
Signed by: jolheiser GPG Key ID: B853ADA5DA7BBF7A
  1. 9
      bench.txt
  2. 24
      overlay.go

9
bench.txt

@ -1,9 +0,0 @@
go test -benchmem -bench=.
goos: linux
goarch: amd64
pkg: go.jolheiser.com/overlay
cpu: Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
BenchmarkCache-8 134959974 9.003 ns/op 0 B/op 0 allocs/op
BenchmarkNoCache-8 897212 1369 ns/op 280 B/op 4 allocs/op
PASS
ok go.jolheiser.com/overlay 3.360s

24
overlay.go

@ -18,12 +18,17 @@ type FS struct {
cache map[string]bool
}
// PurgeCache purges the cache
func (f *FS) PurgeCache() {
f.cache = make(map[string]bool)
}
func (f *FS) apn(name string) string {
return path.Join(f.root, name)
}
func (f *FS) exists(name string) bool {
if has, ok := f.cache[name]; ok && f.doCache {
if has, ok := f.cache[name]; ok {
return has
}
_, err := os.Stat(f.apn(name))
@ -63,10 +68,9 @@ type Option func(*FS) error
// New returns a new FS
func New(root string, fs fs.FS, opts ...Option) (*FS, error) {
x := &FS{
fs: fs,
root: root,
doCache: true,
cache: make(map[string]bool),
fs: fs,
root: root,
cache: make(map[string]bool),
}
for _, opt := range opts {
@ -94,13 +98,3 @@ func WithSub(sub string) Option {
return
}
}
// WithCaching sets a caching mode for an FS
// Caching avoids subsequent os.Stat to determine if a file exists on disk
// See bench.txt for differences in usage
func WithCaching(doCache bool) Option {
return func(x *FS) error {
x.doCache = doCache
return nil
}
}

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