[ReactNative] OSS AsyncStorage with example

ReactKit/Modules/RCTAsyncLocalStorage.h

@@ -0,0 +1,24 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+#import "RCTBridgeModule.h"
+
+/**
+ * A simple, asynchronous, persistent, key-value storage system designed as a
+ * backend to the AsyncStorage JS module, which is modeled after LocalStorage.
+ *
+ * Current implementation stores small values in serialized dictionary and
+ * larger values in separate files. Since we use a serial file queue
+ * `RKFileQueue`, reading/writing from multiple threads should be perceived as
+ * being atomic, unless someone bypasses the `RCTAsyncLocalStorage` API.
+ *
+ * Keys and values must always be strings or an error is returned.
+ */
+@interface RCTAsyncLocalStorage : NSObject <RCTBridgeModule>
+
+- (void)multiGet:(NSArray *)keys callback:(RCTResponseSenderBlock)callback;
+- (void)multiSet:(NSArray *)kvPairs callback:(RCTResponseSenderBlock)callback;
+- (void)multiRemove:(NSArray *)keys callback:(RCTResponseSenderBlock)callback;
+- (void)clear:(RCTResponseSenderBlock)callback;
+- (void)getAllKeys:(RCTResponseSenderBlock)callback;
+
+@end