mirror of
https://github.com/seaweedfs/seaweedfs.git
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114 lines
2.3 KiB
Go
114 lines
2.3 KiB
Go
package chunk_cache
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import (
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"sync"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/storage/needle"
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)
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const (
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memCacheSizeLimit = 1024 * 1024
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onDiskCacheSizeLimit0 = memCacheSizeLimit
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onDiskCacheSizeLimit1 = 4 * memCacheSizeLimit
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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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memCache *ChunkCacheInMemory
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diskCaches []*OnDiskCacheLayer
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sync.RWMutex
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}
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func NewChunkCache(maxEntries int64, dir string, diskSizeMB int64) *ChunkCache {
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c := &ChunkCache{
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memCache: NewChunkCacheInMemory(maxEntries),
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}
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c.diskCaches = make([]*OnDiskCacheLayer, 3)
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c.diskCaches[0] = NewOnDiskCacheLayer(dir, "c0_1", diskSizeMB/4, 4)
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c.diskCaches[1] = NewOnDiskCacheLayer(dir, "c1_4", diskSizeMB/4, 4)
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c.diskCaches[2] = NewOnDiskCacheLayer(dir, "cache", diskSizeMB/2, 4)
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return c
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}
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func (c *ChunkCache) GetChunk(fileId string, chunkSize uint64) (data []byte) {
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if c == nil {
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return
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}
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c.RLock()
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defer c.RUnlock()
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return c.doGetChunk(fileId, chunkSize)
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}
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func (c *ChunkCache) doGetChunk(fileId string, chunkSize uint64) (data []byte) {
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if chunkSize < memCacheSizeLimit {
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if data = c.memCache.GetChunk(fileId); data != nil {
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return data
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}
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}
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fid, err := needle.ParseFileIdFromString(fileId)
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if err != nil {
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glog.Errorf("failed to parse file id %s", fileId)
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return nil
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}
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for _, diskCache := range c.diskCaches {
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data := diskCache.getChunk(fid.Key)
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if len(data) != 0 {
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return data
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}
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}
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return nil
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}
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func (c *ChunkCache) SetChunk(fileId string, data []byte) {
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if c == nil {
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return
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}
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c.Lock()
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defer c.Unlock()
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c.doSetChunk(fileId, data)
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}
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func (c *ChunkCache) doSetChunk(fileId string, data []byte) {
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if len(data) < memCacheSizeLimit {
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c.memCache.SetChunk(fileId, data)
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}
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fid, err := needle.ParseFileIdFromString(fileId)
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if err != nil {
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glog.Errorf("failed to parse file id %s", fileId)
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return
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}
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if len(data) < onDiskCacheSizeLimit0 {
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c.diskCaches[0].setChunk(fid.Key, data)
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} else if len(data) < onDiskCacheSizeLimit1 {
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c.diskCaches[1].setChunk(fid.Key, data)
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} else {
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c.diskCaches[2].setChunk(fid.Key, data)
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}
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}
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func (c *ChunkCache) Shutdown() {
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if c == nil {
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return
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}
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c.Lock()
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defer c.Unlock()
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for _, diskCache := range c.diskCaches {
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diskCache.shutdown()
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}
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}
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