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