diff --git a/cache/cache.go b/cache/cache.go
deleted file mode 100644
index 8eb6e08..0000000
--- a/cache/cache.go
+++ /dev/null
@@ -1,9 +0,0 @@
-package cache
-
-type Cacher interface {
-	SetDict(string) error
-	LoadUserDict(string) error
-	AddWord(string, string, float64)
-	Get(string) (float64, bool)
-	Total() float64
-}
diff --git a/cache/filebased.go b/cache/filebased.go
deleted file mode 100644
index 8286226..0000000
--- a/cache/filebased.go
+++ /dev/null
@@ -1,115 +0,0 @@
-package cache
-
-type FileBasedCache struct {
-	freq                map[[]rune]float64
-	total               float64
-	dictPath, cachePath string
-}
-
-func (f *FileBasedCache) SetDict(dictFileName string) error {
-	if len(f.freq) > 0 {
-		f.freq = make(map[[]rune]flot64)
-	}
-
-	if err := f.setFilePath(dictFileName); err != nil {
-		return err
-	}
-
-	cached, err := f.cached()
-	if err != nil {
-		return err
-	}
-
-	if cached {
-		if err := f.load(cacheFilePath); err == nil {
-			return nil
-		} // TODO: logging?
-	}
-
-	if err := f.read(dictFilePath); err != nil {
-		return err
-	}
-
-	if err := f.dump(cacheFilePath); err != nil {
-		return err
-	}
-}
-
-func (f *FileBasedCache) LoadUserDict(userDictFileName string) error {
-	return nil
-}
-
-func (f *FileBasedCache) AddWord(word, tag string, freq float64) {
-
-}
-
-func (f *FileBasedCache) Get(key string) (float64, bool) {
-	val, ok := f.freq[[]rune(key)]
-	return val, ok
-}
-
-func (f *FileBasedCache) Total() float64 {
-	return f.total
-}
-
-func (f *FileBasedCache) setFilePath() (err error) { // TODO: specify the temp dir
-	f.dictFilePath, err = DictPath(dictFileName)
-	if err != nil {
-		return
-	}
-	f.cacheFilePath = filepath.Join(os.TempDir(),
-		fmt.Sprintf("jieba.%x.cache", md5.Sum([]byte(f.dictFilePath))))
-	return
-}
-
-func (f *FileBasedCache) cached() (bool, error) {
-	dictFileInfo, err := os.Stat(f.dictFilePath) // TODO: logging
-	if err != nil {
-		return false, err
-	}
-
-	cacheFileInfo, err := os.Stat(cacheFilePath)
-	if err != nil { // TODO: logging
-		return false, nil
-	}
-
-	return cacheFileInfo.ModTime().After(dictFileInfo.ModTime()), nil
-}
-
-func (f *FileBasedCache) load(cacheFilePath string) error {
-	cacheFile, err := os.Open(cacheFilePath)
-	if err != nil {
-		return err
-	}
-	defer cacheFile.Close()
-
-	dec := gob.NewDecoder(cacheFile)
-	return dec.Decode(&f)
-}
-
-func (f *FileBasedCache) read(dictFilePath string) error {
-	wtfs, err := ParseDictFile(dictFilePath)
-	if err != nil {
-		return err
-	}
-
-	for _, wtf := range wtfs {
-		t.addWord(wtf) // TODO: add word, ignore frequency
-	}
-
-	return nil
-}
-
-func (f *FileBasedCache) dump(cacheFilePath string) error {
-	cacheFile, err := os.OpenFile(cacheFilePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
-	if err != nil {
-		return err
-	}
-	defer cacheFile.Close()
-
-	enc := gob.NewEncoder(cacheFile)
-	if err := enc.Encode(f); err != nil {
-		return err
-	}
-	return nil
-}