mirror of
https://github.com/minio/minio.git
synced 2024-12-27 07:35:55 -05:00
65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
/*
|
|
* Mini Object Storage, (C) 2014 Minio, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package erasure
|
|
|
|
import (
|
|
"github.com/golang/groupcache/lru"
|
|
"sync"
|
|
)
|
|
|
|
// thread-safe LRU cache from GroupCache
|
|
type Cache struct {
|
|
mutex sync.RWMutex
|
|
cache *lru.Cache
|
|
}
|
|
|
|
var DefaultCache *Cache = GetCache(0)
|
|
|
|
// Allocate ``Cache`` LRU
|
|
func GetCache(capacity int) *Cache {
|
|
return &Cache{
|
|
cache: lru.New(capacity),
|
|
}
|
|
}
|
|
|
|
// ``GetC()`` -- Grab encoder from LRU
|
|
func (c *Cache) GetC(ep *EncoderParams) *Encoder {
|
|
if encoder, ret := c._Get(ep); ret {
|
|
return encoder
|
|
}
|
|
encoder := NewEncoder(ep)
|
|
c._Put(ep, encoder)
|
|
return encoder
|
|
}
|
|
|
|
// ``_Get()`` -- Get key from existing LRU
|
|
func (c *Cache) _Get(ep *EncoderParams) (*Encoder, bool) {
|
|
c.mutex.RLock()
|
|
defer c.mutex.RUnlock()
|
|
if encoder, ret := c.cache.Get(ep); ret {
|
|
return encoder.(*Encoder), ret
|
|
}
|
|
return nil, false
|
|
}
|
|
|
|
// ``_Put()`` -- Add key to existing LRU
|
|
func (c *Cache) _Put(ep *EncoderParams, encoder *Encoder) {
|
|
c.mutex.Lock()
|
|
defer c.mutex.Unlock()
|
|
c.cache.Add(ep, encoder)
|
|
}
|