mirror of
https://github.com/firebase/firebase-ios-sdk
synced 2026-11-10 22:45:59 +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.
35 lines
971 B
Objective-C
35 lines
971 B
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 "FIRServerValue.h"
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#import "FIRServerValue_unreleased.h"
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@implementation FIRServerValue
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+ (NSDictionary *)timestamp {
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static NSDictionary *timestamp = nil;
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if (timestamp == nil) {
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timestamp = @{@".sv" : @"timestamp"};
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}
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return timestamp;
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}
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+ (NSDictionary *)increment:(NSNumber *)delta {
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return @{@".sv" : @{@"increment" : delta}};
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}
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@end
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