seaweedfs/weed/storage/needle_map_memory.go

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package storage
import (
"os"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/storage/idx"
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"github.com/chrislusf/seaweedfs/weed/storage/needle_map"
. "github.com/chrislusf/seaweedfs/weed/storage/types"
)
type NeedleMap struct {
baseNeedleMapper
m needle_map.NeedleValueMap
}
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func NewCompactNeedleMap(file *os.File) *NeedleMap {
nm := &NeedleMap{
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m: needle_map.NewCompactMap(),
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}
nm.indexFile = file
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stat, err := file.Stat()
if err != nil {
glog.Fatalf("stat file %s: %v", file.Name(), err)
}
nm.indexFileOffset = stat.Size()
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return nm
}
func LoadCompactNeedleMap(file *os.File) (*NeedleMap, error) {
nm := NewCompactNeedleMap(file)
return doLoading(file, nm)
}
func doLoading(file *os.File, nm *NeedleMap) (*NeedleMap, error) {
e := idx.WalkIndexFile(file, func(key NeedleId, offset Offset, size Size) error {
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nm.MaybeSetMaxFileKey(key)
if !offset.IsZero() && size.IsValid() {
nm.FileCounter++
nm.FileByteCounter = nm.FileByteCounter + uint64(size)
oldOffset, oldSize := nm.m.Set(NeedleId(key), offset, size)
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if !oldOffset.IsZero() && oldSize.IsValid() {
nm.DeletionCounter++
nm.DeletionByteCounter = nm.DeletionByteCounter + uint64(oldSize)
}
} else {
oldSize := nm.m.Delete(NeedleId(key))
nm.DeletionCounter++
nm.DeletionByteCounter = nm.DeletionByteCounter + uint64(oldSize)
}
return nil
})
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glog.V(1).Infof("max file key: %d for file: %s", nm.MaxFileKey(), file.Name())
return nm, e
}
func (nm *NeedleMap) Put(key NeedleId, offset Offset, size Size) error {
_, oldSize := nm.m.Set(NeedleId(key), offset, size)
nm.logPut(key, oldSize, size)
return nm.appendToIndexFile(key, offset, size)
}
func (nm *NeedleMap) Get(key NeedleId) (element *needle_map.NeedleValue, ok bool) {
element, ok = nm.m.Get(NeedleId(key))
return
}
func (nm *NeedleMap) Delete(key NeedleId, offset Offset) error {
deletedBytes := nm.m.Delete(NeedleId(key))
nm.logDelete(deletedBytes)
return nm.appendToIndexFile(key, offset, TombstoneFileSize)
}
func (nm *NeedleMap) Close() {
indexFileName := nm.indexFile.Name()
if err := nm.indexFile.Sync(); err != nil {
glog.Warningf("sync file %s failed, %v", indexFileName, err)
}
_ = nm.indexFile.Close()
}
func (nm *NeedleMap) Destroy() error {
nm.Close()
return os.Remove(nm.indexFile.Name())
}