mirror of
https://github.com/firebase/firebase-ios-sdk
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46 lines
1.4 KiB
Objective-C
46 lines
1.4 KiB
Objective-C
/*
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* Copyright 2017 Google
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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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@class FSTWriteGroup;
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NS_ASSUME_NONNULL_BEGIN
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/**
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* Helper class for FSTPersistence implementations to create WriteGroups and verify internal
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* contracts are maintained:
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* 1. Can't create a group when an uncommitted group exists (no nesting).
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* 2. Can't commit a group that differs from the last created one.
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*/
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@interface FSTWriteGroupTracker : NSObject
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/** Creates and returns an FSTWriteGroupTracker instance. */
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+ (instancetype)tracker;
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/**
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* Verifies there's no active group already and then creates a new group and stores it for later
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* validation with `endGroup`.
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*/
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- (FSTWriteGroup *)startGroupWithAction:(NSString *)action;
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/** Ends a group previously started with `startGroupWithAction`. */
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- (void)endGroup:(FSTWriteGroup *)group;
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@end
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NS_ASSUME_NONNULL_END
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