frostfs-s3-gw/api/cache/system.go
Denis Kirillov 19b917e3b5 [#253] Caches refactoring
Signed-off-by: Denis Kirillov <denis@nspcc.ru>
2021-09-14 10:46:18 +03:00

58 lines
1.4 KiB
Go

package cache
import (
"time"
"github.com/bluele/gcache"
"github.com/nspcc-dev/neofs-api-go/pkg/object"
)
// SystemCache provides lru cache for objects.
// This cache contains "system" objects (bucket versioning settings, tagging object etc.).
// Key is bucketName+systemFileName.
type SystemCache struct {
cache gcache.Cache
}
const (
// DefaultSystemCacheSize is a default maximum number of entries in cache.
DefaultSystemCacheSize = 1e4
// DefaultSystemCacheLifetime is a default lifetime of entries in cache.
DefaultSystemCacheLifetime = 5 * time.Minute
)
// DefaultSystemConfig return new default cache expiration values.
func DefaultSystemConfig() *Config {
return &Config{Size: DefaultSystemCacheSize, Lifetime: DefaultSystemCacheLifetime}
}
// NewSystemCache creates an object of SystemCache.
func NewSystemCache(config *Config) *SystemCache {
gc := gcache.New(config.Size).LRU().Expiration(config.Lifetime).Build()
return &SystemCache{cache: gc}
}
// Get returns cached object.
func (o *SystemCache) Get(key string) *object.Object {
entry, err := o.cache.Get(key)
if err != nil {
return nil
}
result, ok := entry.(*object.Object)
if !ok {
return nil
}
return result
}
// Put puts an object to cache.
func (o *SystemCache) Put(key string, obj *object.Object) error {
return o.cache.Set(key, obj)
}
// Delete deletes an object from cache.
func (o *SystemCache) Delete(key string) bool {
return o.cache.Remove(key)
}