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117 lines
2.7 KiB
117 lines
2.7 KiB
package chunk_cache
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import (
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"fmt"
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"path"
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"sort"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/storage"
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"github.com/chrislusf/seaweedfs/weed/storage/types"
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)
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type OnDiskCacheLayer struct {
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diskCaches []*ChunkCacheVolume
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}
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func NewOnDiskCacheLayer(dir, namePrefix string, diskSize int64, segmentCount int) *OnDiskCacheLayer {
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volumeCount, volumeSize := int(diskSize/(30000*1024*1024)), int64(30000*1024*1024)
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if volumeCount < segmentCount {
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volumeCount, volumeSize = segmentCount, diskSize/int64(segmentCount)
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}
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c := &OnDiskCacheLayer{}
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for i := 0; i < volumeCount; i++ {
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fileName := path.Join(dir, fmt.Sprintf("%s_%d", namePrefix, i))
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diskCache, err := LoadOrCreateChunkCacheVolume(fileName, volumeSize)
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if err != nil {
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glog.Errorf("failed to add cache %s : %v", fileName, err)
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} else {
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c.diskCaches = append(c.diskCaches, diskCache)
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}
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}
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// keep newest cache to the front
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sort.Slice(c.diskCaches, func(i, j int) bool {
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return c.diskCaches[i].lastModTime.After(c.diskCaches[j].lastModTime)
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})
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return c
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}
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func (c *OnDiskCacheLayer) setChunk(needleId types.NeedleId, data []byte) {
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if len(c.diskCaches) == 0 {
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return
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}
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if c.diskCaches[0].fileSize+int64(len(data)) > c.diskCaches[0].sizeLimit {
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t, resetErr := c.diskCaches[len(c.diskCaches)-1].Reset()
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if resetErr != nil {
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glog.Errorf("failed to reset cache file %s", c.diskCaches[len(c.diskCaches)-1].fileName)
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return
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}
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for i := len(c.diskCaches) - 1; i > 0; i-- {
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c.diskCaches[i] = c.diskCaches[i-1]
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}
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c.diskCaches[0] = t
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}
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if err := c.diskCaches[0].WriteNeedle(needleId, data); err != nil {
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glog.V(0).Infof("cache write %v size %d: %v", needleId, len(data), err)
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}
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}
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func (c *OnDiskCacheLayer) getChunk(needleId types.NeedleId) (data []byte) {
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var err error
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for _, diskCache := range c.diskCaches {
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data, err = diskCache.GetNeedle(needleId)
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if err == storage.ErrorNotFound {
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continue
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}
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if err != nil {
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glog.Errorf("failed to read cache file %s id %d", diskCache.fileName, needleId)
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continue
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}
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if len(data) != 0 {
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return
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}
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}
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return nil
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}
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func (c *OnDiskCacheLayer) getChunkSlice(needleId types.NeedleId, offset, length uint64) (data []byte) {
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var err error
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for _, diskCache := range c.diskCaches {
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data, err = diskCache.getNeedleSlice(needleId, offset, length)
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if err == storage.ErrorNotFound {
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continue
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}
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if err != nil {
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glog.Warningf("failed to read cache file %s id %d: %v", diskCache.fileName, needleId, err)
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continue
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}
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if len(data) != 0 {
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return
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}
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}
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return nil
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}
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func (c *OnDiskCacheLayer) shutdown() {
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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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