seaweedfs/weed/storage/needle_map_memory.go

package storage

import (
	"os"

	"github.com/chrislusf/seaweedfs/weed/glog"
	"github.com/chrislusf/seaweedfs/weed/storage/idx"
	"github.com/chrislusf/seaweedfs/weed/storage/needle_map"
	. "github.com/chrislusf/seaweedfs/weed/storage/types"
)

type NeedleMap struct {
	baseNeedleMapper
	m needle_map.NeedleValueMap
}

func NewCompactNeedleMap(file *os.File) *NeedleMap {
	nm := &NeedleMap{
		m: needle_map.NewCompactMap(),
	}
	nm.indexFile = file
	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 {
		nm.MaybeSetMaxFileKey(key)
		if !offset.IsZero() {
			nm.FileCounter++
			nm.FileByteCounter = nm.FileByteCounter + uint64(size)

			oldOffset, oldSize := nm.m.Set(NeedleId(key), offset, size)
			if !oldOffset.IsZero() && oldSize.IsValid() {
				nm.DeletionCounter++
				nm.DeletionByteCounter = nm.DeletionByteCounter + uint64(oldSize)
			} else if size < 0 {
				// deletion
				nm.DeletionCounter++
				nm.DeletionByteCounter = nm.DeletionByteCounter + uint64(-size)
			}
		} else {
			oldSize := nm.m.Delete(NeedleId(key))
			nm.DeletionCounter++
			nm.DeletionByteCounter = nm.DeletionByteCounter + uint64(oldSize)
		}
		return nil
	})
	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) (existingValue *needle_map.NeedleValue, ok bool) {
	existingValue, ok = nm.m.Get(NeedleId(key))
	return
}
func (nm *NeedleMap) Delete(key NeedleId) error {
	existingValue, ok := nm.m.Get(NeedleId(key))
	if !ok || existingValue.Size.IsDeleted(){
		return nil
	}
	deletedBytes := nm.m.Delete(NeedleId(key))
	nm.logDelete(deletedBytes)
	return nm.appendToIndexFile(key, existingValue.Offset, -existingValue.Size)
}
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())
}