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/*
* Copyright 2017 Google
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import "FCachePolicy.h"
@interface FLRUCachePolicy ()
@property (nonatomic, readwrite) NSUInteger maxSize;
@end
static const NSUInteger kFServerUpdatesBetweenCacheSizeChecks = 1000;
static const NSUInteger kFMaxNumberOfPrunableQueriesToKeep = 1000;
static const float kFPercentOfQueriesToPruneAtOnce = 0.2f;
@implementation FLRUCachePolicy
- (id)initWithMaxSize:(NSUInteger)maxSize {
self = [super init];
if (self != nil) {
self->_maxSize = maxSize;
}
return self;
}
- (BOOL)shouldPruneCacheWithSize:(NSUInteger)cacheSize numberOfTrackedQueries:(NSUInteger)numTrackedQueries {
return cacheSize > self.maxSize || numTrackedQueries > kFMaxNumberOfPrunableQueriesToKeep;
}
- (BOOL)shouldCheckCacheSize:(NSUInteger)serverUpdatesSinceLastCheck {
return serverUpdatesSinceLastCheck > kFServerUpdatesBetweenCacheSizeChecks;
}
- (float)percentOfQueriesToPruneAtOnce {
return kFPercentOfQueriesToPruneAtOnce;
}
- (NSUInteger)maxNumberOfQueriesToKeep {
return kFMaxNumberOfPrunableQueriesToKeep;
}
@end
@implementation FNoCachePolicy
+ (FNoCachePolicy *)noCachePolicy {
return [[FNoCachePolicy alloc] init];
}
- (BOOL)shouldPruneCacheWithSize:(NSUInteger)cacheSize numberOfTrackedQueries:(NSUInteger)numTrackedQueries {
return NO;
}
- (BOOL)shouldCheckCacheSize:(NSUInteger)serverUpdatesSinceLastCheck {
return NO;
}
- (float)percentOfQueriesToPruneAtOnce {
return 0;
}
- (NSUInteger)maxNumberOfQueriesToKeep {
return NSUIntegerMax;
}
@end
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