mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-01-19 02:48:24 +00:00
114 lines
2.3 KiB
Go
114 lines
2.3 KiB
Go
package chunk_cache
|
|
|
|
import (
|
|
"sync"
|
|
|
|
"github.com/chrislusf/seaweedfs/weed/glog"
|
|
"github.com/chrislusf/seaweedfs/weed/storage/needle"
|
|
)
|
|
|
|
const (
|
|
memCacheSizeLimit = 1024 * 1024
|
|
onDiskCacheSizeLimit0 = memCacheSizeLimit
|
|
onDiskCacheSizeLimit1 = 4 * memCacheSizeLimit
|
|
)
|
|
|
|
// a global cache for recently accessed file chunks
|
|
type ChunkCache struct {
|
|
memCache *ChunkCacheInMemory
|
|
diskCaches []*OnDiskCacheLayer
|
|
sync.RWMutex
|
|
}
|
|
|
|
func NewChunkCache(maxEntries int64, dir string, diskSizeMB int64) *ChunkCache {
|
|
|
|
c := &ChunkCache{
|
|
memCache: NewChunkCacheInMemory(maxEntries),
|
|
}
|
|
c.diskCaches = make([]*OnDiskCacheLayer, 3)
|
|
c.diskCaches[0] = NewOnDiskCacheLayer(dir, "c0_1", diskSizeMB/4, 4)
|
|
c.diskCaches[1] = NewOnDiskCacheLayer(dir, "c1_4", diskSizeMB/4, 4)
|
|
c.diskCaches[2] = NewOnDiskCacheLayer(dir, "cache", diskSizeMB/2, 4)
|
|
|
|
return c
|
|
}
|
|
|
|
func (c *ChunkCache) GetChunk(fileId string, chunkSize uint64) (data []byte) {
|
|
if c == nil {
|
|
return
|
|
}
|
|
|
|
c.RLock()
|
|
defer c.RUnlock()
|
|
|
|
return c.doGetChunk(fileId, chunkSize)
|
|
}
|
|
|
|
func (c *ChunkCache) doGetChunk(fileId string, chunkSize uint64) (data []byte) {
|
|
|
|
if chunkSize < memCacheSizeLimit {
|
|
if data = c.memCache.GetChunk(fileId); data != nil {
|
|
return data
|
|
}
|
|
}
|
|
|
|
fid, err := needle.ParseFileIdFromString(fileId)
|
|
if err != nil {
|
|
glog.Errorf("failed to parse file id %s", fileId)
|
|
return nil
|
|
}
|
|
|
|
for _, diskCache := range c.diskCaches {
|
|
data := diskCache.getChunk(fid.Key)
|
|
if len(data) != 0 {
|
|
return data
|
|
}
|
|
}
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
func (c *ChunkCache) SetChunk(fileId string, data []byte) {
|
|
if c == nil {
|
|
return
|
|
}
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
|
|
c.doSetChunk(fileId, data)
|
|
}
|
|
|
|
func (c *ChunkCache) doSetChunk(fileId string, data []byte) {
|
|
|
|
if len(data) < memCacheSizeLimit {
|
|
c.memCache.SetChunk(fileId, data)
|
|
}
|
|
|
|
fid, err := needle.ParseFileIdFromString(fileId)
|
|
if err != nil {
|
|
glog.Errorf("failed to parse file id %s", fileId)
|
|
return
|
|
}
|
|
|
|
if len(data) < onDiskCacheSizeLimit0 {
|
|
c.diskCaches[0].setChunk(fid.Key, data)
|
|
} else if len(data) < onDiskCacheSizeLimit1 {
|
|
c.diskCaches[1].setChunk(fid.Key, data)
|
|
} else {
|
|
c.diskCaches[2].setChunk(fid.Key, data)
|
|
}
|
|
|
|
}
|
|
|
|
func (c *ChunkCache) Shutdown() {
|
|
if c == nil {
|
|
return
|
|
}
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
for _, diskCache := range c.diskCaches {
|
|
diskCache.shutdown()
|
|
}
|
|
}
|