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