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55abeed743
* Introduce let / var and some further cleanup * Address first comments * Update changelog * Move the const before auto
91 lines
2.7 KiB
Plaintext
91 lines
2.7 KiB
Plaintext
//
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// ASCollectionLayoutCache.mm
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// Texture
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//
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// Copyright (c) 2017-present, Pinterest, Inc. All rights reserved.
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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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#import <AsyncDisplayKit/ASCollectionLayoutCache.h>
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#import <AsyncDisplayKit/ASCollectionLayoutContext.h>
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#import <AsyncDisplayKit/ASCollectionLayoutState.h>
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#import <AsyncDisplayKit/ASElementMap.h>
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#import <AsyncDisplayKit/ASThread.h>
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@implementation ASCollectionLayoutCache {
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ASDN::Mutex __instanceLock__;
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/**
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* The underlying data structure of this cache.
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*
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* The outer map table is a weak to strong table. That is because ASCollectionLayoutContext doesn't (and shouldn't)
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* hold a strong reference on its element map. As a result, this cache should handle the case in which
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* an element map no longer exists and all contexts and layouts associated with it should be cleared.
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*
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* The inner map table is a standard strong to strong map.
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* Since different ASCollectionLayoutContext objects with the same content are considered equal,
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* "object pointer personality" can't be used as a key option.
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*/
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NSMapTable<ASElementMap *, NSMapTable<ASCollectionLayoutContext *, ASCollectionLayoutState *> *> *_map;
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}
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- (instancetype)init
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{
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self = [super init];
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if (self) {
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_map = [NSMapTable mapTableWithKeyOptions:(NSMapTableWeakMemory | NSMapTableObjectPointerPersonality) valueOptions:NSMapTableStrongMemory];
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}
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return self;
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}
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- (ASCollectionLayoutState *)layoutForContext:(ASCollectionLayoutContext *)context
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{
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ASElementMap *elements = context.elements;
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if (elements == nil) {
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return nil;
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}
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ASDN::MutexLocker l(__instanceLock__);
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return [[_map objectForKey:elements] objectForKey:context];
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}
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- (void)setLayout:(ASCollectionLayoutState *)layout forContext:(ASCollectionLayoutContext *)context
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{
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ASElementMap *elements = context.elements;
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if (layout == nil || elements == nil) {
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return;
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}
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ASDN::MutexLocker l(__instanceLock__);
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var innerMap = [_map objectForKey:elements];
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if (innerMap == nil) {
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innerMap = [NSMapTable strongToStrongObjectsMapTable];
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[_map setObject:innerMap forKey:elements];
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}
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[innerMap setObject:layout forKey:context];
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}
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- (void)removeLayoutForContext:(ASCollectionLayoutContext *)context
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{
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ASElementMap *elements = context.elements;
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if (elements == nil) {
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return;
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}
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ASDN::MutexLocker l(__instanceLock__);
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[[_map objectForKey:elements] removeObjectForKey:context];
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}
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- (void)removeAllLayouts
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{
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ASDN::MutexLocker l(__instanceLock__);
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[_map removeAllObjects];
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}
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@end
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