Store: New Count() function to return count of all records stored.

store/Memory.go

@@ -71,3 +71,10 @@ func (ms *MemoryStore) Delete(key []byte) {
 	delete(ms.data, string(key))
 	ms.mutex.Unlock()
 }
+
+// Count returns the count of records stored.
+func (ms *MemoryStore) Count() uint64 {
+	ms.mutex.Lock()
+	defer ms.mutex.Unlock()
+	return uint64(len(ms.data))
+}

store/Pogreb.go

@@ -69,3 +69,8 @@ func (store *PogrebStore) Get(key []byte) (data []byte, found bool) {
 func (store *PogrebStore) Delete(key []byte) {
 	store.db.Delete(key)
 }
+
+// Count returns the count of records stored.
+func (store *PogrebStore) Count() uint64 {
+	return uint64(store.db.Count())
+}

store/Store.go

@@ -29,4 +29,7 @@ type Store interface {
 
 	// ExpireKeys is called to delete all keys that are marked for expiration.
 	ExpireKeys()
+
+	// Count returns the total number of records stored.
+	Count() uint64
 }