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