1 files changed, 93 insertions, 0 deletions
diff --git a/weed/filesys/meta_cache/meta_cache.go b/weed/filesys/meta_cache/meta_cache.go
new file mode 100644
index 000000000..4c9090d42
--- /dev/null
+++ b/weed/filesys/meta_cache/meta_cache.go
@@ -0,0 +1,93 @@
+package meta_cache
+
+import (
+	"context"
+	"os"
+	"sync"
+
+	"github.com/chrislusf/seaweedfs/weed/filer2"
+	"github.com/chrislusf/seaweedfs/weed/filer2/leveldb"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+type MetaCache struct {
+	actualStore filer2.FilerStore
+	sync.RWMutex
+}
+
+func NewMetaCache(dbFolder string) *MetaCache {
+	return &MetaCache{
+		actualStore: openMetaStore(dbFolder),
+	}
+}
+
+func openMetaStore(dbFolder string) filer2.FilerStore {
+
+	os.RemoveAll(dbFolder)
+	os.MkdirAll(dbFolder, 0755)
+
+	store := &leveldb.LevelDBStore{}
+	config := &cacheConfig{
+		dir: dbFolder,
+	}
+
+	if err := store.Initialize(config, ""); err != nil {
+		glog.Fatalf("Failed to initialize metadata cache store for %s: %+v", store.GetName(), err)
+	}
+
+	return store
+
+}
+
+func (mc *MetaCache) InsertEntry(ctx context.Context, entry *filer2.Entry) error {
+	mc.Lock()
+	defer mc.Unlock()
+	return mc.actualStore.InsertEntry(ctx, entry)
+}
+
+func (mc *MetaCache) AtomicUpdateEntry(ctx context.Context, oldPath util.FullPath, newEntry *filer2.Entry) error {
+	mc.Lock()
+	defer mc.Unlock()
+	if oldPath != "" {
+		if err := mc.actualStore.DeleteEntry(ctx, oldPath); err != nil {
+			return err
+		}
+	}
+	if newEntry != nil {
+		if err := mc.actualStore.InsertEntry(ctx, newEntry); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (mc *MetaCache) UpdateEntry(ctx context.Context, entry *filer2.Entry) error {
+	mc.Lock()
+	defer mc.Unlock()
+	return mc.actualStore.UpdateEntry(ctx, entry)
+}
+
+func (mc *MetaCache) FindEntry(ctx context.Context, fp util.FullPath) (entry *filer2.Entry, err error) {
+	mc.RLock()
+	defer mc.RUnlock()
+	return mc.actualStore.FindEntry(ctx, fp)
+}
+
+func (mc *MetaCache) DeleteEntry(ctx context.Context, fp util.FullPath) (err error) {
+	mc.Lock()
+	defer mc.Unlock()
+	return mc.actualStore.DeleteEntry(ctx, fp)
+}
+
+func (mc *MetaCache) ListDirectoryEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int) ([]*filer2.Entry, error) {
+	mc.RLock()
+	defer mc.RUnlock()
+	return mc.actualStore.ListDirectoryEntries(ctx, dirPath, startFileName, includeStartFile, limit)
+}
+
+func (mc *MetaCache) Shutdown() {
+	mc.Lock()
+	defer mc.Unlock()
+	mc.actualStore.Shutdown()
+}