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package chunk_cache
import (
"time"
"github.com/karlseguin/ccache/v2"
)
// a global cache for recently accessed file chunks
type ChunkCacheInMemory struct {
cache *ccache.Cache
}
func NewChunkCacheInMemory(maxEntries int64) *ChunkCacheInMemory {
pruneCount := maxEntries >> 3
if pruneCount <= 0 {
pruneCount = 500
}
return &ChunkCacheInMemory{
cache: ccache.New(ccache.Configure().MaxSize(maxEntries).ItemsToPrune(uint32(pruneCount))),
}
}
func (c *ChunkCacheInMemory) GetChunk(fileId string) []byte {
item := c.cache.Get(fileId)
if item == nil {
return nil
}
data := item.Value().([]byte)
item.Extend(time.Hour)
return data
}
func (c *ChunkCacheInMemory) SetChunk(fileId string, data []byte) {
c.cache.Set(fileId, data, time.Hour)
}
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