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/*
* Copyright 2021 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
/**
* Describes an object that can store and fetch heartbeat dates for given tags.
*/
@protocol GULHeartbeatDateStorable <NSObject>
/**
* Reads the date from the specified file for the given tag.
* @return Returns date if exists, otherwise `nil`.
*/
- (nullable NSDate *)heartbeatDateForTag:(NSString *)tag;
/**
* Saves the date for the specified tag in the specified file.
* @return YES on success, NO otherwise.
*/
- (BOOL)setHearbeatDate:(NSDate *)date forTag:(NSString *)tag;
@end
NS_ASSUME_NONNULL_END