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* [License] Simplify the Texture license to be pure Apache 2 (removing ASDK-Licenses) With permission of the Facebook Open Source team, we are simplifying the Texture license so that clients can rely on the Apache 2 terms that most of Texture is already covered by. This means that code originally forked from AsyncDisplayKit will be re-licensed from "BSD 3-clause + PATENTS v2" to Apache 2 without a PATENTS file. After getting confirmation that the updates to these core files look good, we'll propagate this new license header to all files (in this same PR) and get sign-off from all parties before landing. * [License] Update all Texture source files to be pure Apache 2. * Changelog entry for Apache 2 license update. * Revert "[License] Update all Texture source files to be pure Apache 2." This reverts commit ffa0fbbba9717d871dd16c4b07539f2f8208fc2b. * [License] Update all Texture source files to be pure Apache 2, maintaining copyrights. * [License] Update CONTRIBUTING, README, Podspec & Dangerfile.
79 lines
2.1 KiB
Objective-C
79 lines
2.1 KiB
Objective-C
//
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// ASWeakMap.m
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// Texture
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//
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// Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
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// Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <AsyncDisplayKit/ASWeakMap.h>
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@interface ASWeakMapEntry ()
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@property (nonatomic, readonly) id key;
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@property id value;
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@end
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@implementation ASWeakMapEntry
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- (instancetype)initWithKey:(id)key value:(id)value
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{
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self = [super init];
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if (self) {
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_key = key;
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_value = value;
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}
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return self;
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}
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@end
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@interface ASWeakMap ()
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@property (nonatomic, readonly) NSMapTable<id, ASWeakMapEntry *> *hashTable;
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@end
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/**
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* Implementation details:
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*
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* The retained size of our keys is potentially very large (for example, a UIImage is commonly part of a key).
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* Unfortunately, NSMapTable does not make guarantees about how quickly it will dispose of entries where
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* either the key or the value is weak and has been disposed. So, a NSMapTable with "strong key to weak value" is
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* unsuitable for our purpose because the strong keys are retained longer than the value and for an indefininte period of time.
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* More details here: http://cocoamine.net/blog/2013/12/13/nsmaptable-and-zeroing-weak-references/
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*
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* Our NSMapTable is "weak key to weak value" where each key maps to an Entry. The Entry object is responsible
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* for retaining both the key and value. Our convention is that the caller must retain the Entry object
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* in order to keep the key and the value in the cache.
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*/
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@implementation ASWeakMap
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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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_hashTable = [NSMapTable weakToWeakObjectsMapTable];
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}
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return self;
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}
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- (ASWeakMapEntry *)entryForKey:(id)key
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{
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return [self.hashTable objectForKey:key];
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}
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- (ASWeakMapEntry *)setObject:(id)value forKey:(id)key
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{
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ASWeakMapEntry *entry = [self.hashTable objectForKey:key];
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if (entry != nil) {
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// Update the value in the existing entry.
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entry.value = value;
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} else {
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entry = [[ASWeakMapEntry alloc] initWithKey:key value:value];
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[self.hashTable setObject:entry forKey:key];
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}
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return entry;
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}
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@end
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