80 lines
2.1 KiB
Objective-C
80 lines
2.1 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 "FCachePolicy.h"
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@interface FLRUCachePolicy ()
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@property (nonatomic, readwrite) NSUInteger maxSize;
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@end
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static const NSUInteger kFServerUpdatesBetweenCacheSizeChecks = 1000;
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static const NSUInteger kFMaxNumberOfPrunableQueriesToKeep = 1000;
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static const float kFPercentOfQueriesToPruneAtOnce = 0.2f;
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@implementation FLRUCachePolicy
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- (id)initWithMaxSize:(NSUInteger)maxSize {
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self = [super init];
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if (self != nil) {
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self->_maxSize = maxSize;
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}
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return self;
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}
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- (BOOL)shouldPruneCacheWithSize:(NSUInteger)cacheSize numberOfTrackedQueries:(NSUInteger)numTrackedQueries {
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return cacheSize > self.maxSize || numTrackedQueries > kFMaxNumberOfPrunableQueriesToKeep;
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}
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- (BOOL)shouldCheckCacheSize:(NSUInteger)serverUpdatesSinceLastCheck {
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return serverUpdatesSinceLastCheck > kFServerUpdatesBetweenCacheSizeChecks;
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}
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- (float)percentOfQueriesToPruneAtOnce {
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return kFPercentOfQueriesToPruneAtOnce;
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}
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- (NSUInteger)maxNumberOfQueriesToKeep {
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return kFMaxNumberOfPrunableQueriesToKeep;
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}
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@end
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@implementation FNoCachePolicy
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+ (FNoCachePolicy *)noCachePolicy {
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return [[FNoCachePolicy alloc] init];
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}
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- (BOOL)shouldPruneCacheWithSize:(NSUInteger)cacheSize numberOfTrackedQueries:(NSUInteger)numTrackedQueries {
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return NO;
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}
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- (BOOL)shouldCheckCacheSize:(NSUInteger)serverUpdatesSinceLastCheck {
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return NO;
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}
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- (float)percentOfQueriesToPruneAtOnce {
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return 0;
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}
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- (NSUInteger)maxNumberOfQueriesToKeep {
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return NSUIntegerMax;
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}
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@end
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