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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 "Firestore/Source/Local/FSTEagerGarbageCollector.h"
#import "Firestore/Source/Model/FSTDocumentKey.h"
NS_ASSUME_NONNULL_BEGIN
#pragma mark - FSTMultiReferenceSet
@interface FSTEagerGarbageCollector ()
/** The garbage collectible sources to double-check during garbage collection. */
@property(nonatomic, strong, readonly) NSMutableArray<id<FSTGarbageSource>> *sources;
/** A set of potentially garbage keys. */
@property(nonatomic, strong, readonly) NSMutableSet<FSTDocumentKey *> *potentialGarbage;
@end
@implementation FSTEagerGarbageCollector
- (instancetype)init {
self = [super init];
if (self) {
_sources = [NSMutableArray array];
_potentialGarbage = [[NSMutableSet alloc] init];
}
return self;
}
- (BOOL)isEager {
return YES;
}
- (void)addGarbageSource:(id<FSTGarbageSource>)garbageSource {
[self.sources addObject:garbageSource];
garbageSource.garbageCollector = self;
}
- (void)removeGarbageSource:(id<FSTGarbageSource>)garbageSource {
[self.sources removeObject:garbageSource];
garbageSource.garbageCollector = nil;
}
- (void)addPotentialGarbageKey:(FSTDocumentKey *)key {
[self.potentialGarbage addObject:key];
}
- (NSMutableSet<FSTDocumentKey *> *)collectGarbage {
NSMutableArray<id<FSTGarbageSource>> *sources = self.sources;
NSMutableSet<FSTDocumentKey *> *actualGarbage = [NSMutableSet set];
for (FSTDocumentKey *key in self.potentialGarbage) {
BOOL isGarbage = YES;
for (id<FSTGarbageSource> source in sources) {
if ([source containsKey:key]) {
isGarbage = NO;
break;
}
}
if (isGarbage) {
[actualGarbage addObject:key];
}
}
// Clear locally retained potential keys and returned confirmed garbage.
[self.potentialGarbage removeAllObjects];
return actualGarbage;
}
@end
NS_ASSUME_NONNULL_END
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