mirror of
https://github.com/firebase/firebase-ios-sdk
synced 2026-11-11 22:55:59 +05:45
Thomas Bouldin
90e4522e66
* Definition is currently in an "unreleased" extension to FIRServerValues * Tests are added to FData.m (integration tests) * Some tests are renamed to make it clear that ServerValues != timestamps * Functions that resolve server values now need access to any existing snapshot. This is done with lazy evaluation as described below: Based on fix https://github.com/firebase/firebase-js-sdk/pull/2499 to bug https://github.com/firebase/firebase-js-sdk/issues/2487 Micro-benchmarking showed that N writes in succession led to N^2 performance when calculating the resolved write tree for those writes (thankfully only at the subpath in this SDK). Lazy evaluation of current data matches the optimization in JS that mitigated a 20% performance regression.
43 lines
1.5 KiB
Objective-C
43 lines
1.5 KiB
Objective-C
/*
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* Copyright 2019 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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#ifndef FIRServerValue_unreleased_h
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#define FIRServerValue_unreleased_h
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#import "FIRServerValue.h"
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@interface FIRServerValue (Unreleased)
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/**
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* Adds the given delta to the current value at a location.
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*
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* The delta must be an long or a double value. If the current value is not an
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* integer or double, or if the data does not yet exist, the transformation will
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* set the data to the delta value. If either of the delta value or the existing
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* data are doubles, both values will be interpreted as doubles. Double
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* arithmetic and representation of double values follow IEEE 754 semantics. If
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* there is positive/negative integer overflow, the sum is calculated as a a
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* double.
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*
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* @param delta the amount to modify the current value atomically.
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* @return a placeholder value for modifying data atomically server-side.
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*/
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+ (NSDictionary *)increment:(NSNumber *)delta NS_SWIFT_NAME(increment(_:));
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@end
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#endif /* FIRServerValue_unreleased_h */
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