store: added StringStore

server/store/memory/string_store.go

@@ -0,0 +1,57 @@
+// Copyright 2016 The Chihaya Authors. All rights reserved.
+// Use of this source code is governed by the BSD 2-Clause license,
+// which can be found in the LICENSE file.
+
+package memory
+
+import (
+	"sync"
+
+	"github.com/chihaya/chihaya/server/store"
+)
+
+func init() {
+	store.RegisterStringStoreDriver("memory", &stringStoreDriver{})
+}
+
+type stringStoreDriver struct{}
+
+func (d *stringStoreDriver) New(cfg *store.Config) (store.StringStore, error) {
+	return &stringStore{
+		strings: make(map[string]struct{}),
+	}, nil
+}
+
+type stringStore struct {
+	strings map[string]struct{}
+	sync.RWMutex
+}
+
+var _ store.StringStore = &stringStore{}
+
+func (ss *stringStore) PutString(s string) error {
+	ss.Lock()
+	defer ss.Unlock()
+
+	ss.strings[s] = struct{}{}
+
+	return nil
+}
+
+func (ss *stringStore) HasString(s string) (bool, error) {
+	ss.RLock()
+	defer ss.RUnlock()
+
+	_, ok := ss.strings[s]
+
+	return ok, nil
+}
+
+func (ss *stringStore) RemoveString(s string) error {
+	ss.Lock()
+	defer ss.Unlock()
+
+	delete(ss.strings, s)
+
+	return nil
+}