/* * The MIT License (MIT) * * Copyright (c) 2019 Alibaba Group * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #import "FLBStackCache.h" @interface FLBStackCache() @property (nonatomic,strong) NSMutableArray *keyStack; @property (nonatomic,strong) NSMutableDictionary *typesMap; @property (nonatomic,strong) NSMutableDictionary *inMemoryObjectsMap; @property (nonatomic,strong) NSMutableDictionary *loadinMap; @property (nonatomic,strong) dispatch_queue_t queueIO; @end @implementation FLBStackCache + (instancetype)sharedInstance { static id sInstance = nil; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ sInstance = [self.class new]; }); return sInstance; } - (BOOL)empty { return _keyStack.count<=0; } - (void)clear { [self.keyStack removeAllObjects]; [self.inMemoryObjectsMap removeAllObjects]; [self.typesMap removeAllObjects]; NSError *err = nil; [[NSFileManager defaultManager] removeItemAtPath:self.cacheDir error:&err]; if (err) { NSLog(@"fail to remove cache dir %@",err); } } - (instancetype)init { if (self = [super init]) { _keyStack = [NSMutableArray new]; _inMemoryObjectsMap = [NSMutableDictionary new]; _loadinMap = [NSMutableDictionary new]; _typesMap = [NSMutableDictionary new]; _queueIO = dispatch_queue_create("Stack cache working queue", NULL); } _inMemoryCount = 2; return self; } - (void)pushObject:(id<FLBStackCacheObject>)obj key:(NSString *)key { if (!obj || key.length <= 0) { return; } if(!_inMemoryObjectsMap[key]){ [_keyStack addObject:key]; }else{ //return; } obj.key = key; _typesMap[key] = obj.class; _inMemoryObjectsMap[key] = obj; for(NSUInteger i = _keyStack.count - _inMemoryObjectsMap.count ; i < _keyStack.count && _inMemoryObjectsMap.count > _inMemoryCount; i++){ NSString *keyToSave = _keyStack[i]; if(_inMemoryObjectsMap[keyToSave]){ id<FLBStackCacheObject> ob = _inMemoryObjectsMap[keyToSave]; [_inMemoryObjectsMap removeObjectForKey:keyToSave]; [ob writeToFileWithKey:keyToSave queue:_queueIO cache:self completion:^(NSError *err, NSString *path) { if (err) { NSLog(@"Caching object to file failed!"); } }]; } } } - (id<FLBStackCacheObject>)objectForKey:(NSString *)key { return _inMemoryObjectsMap[key]; } - (id<FLBStackCacheObject>)remove:(NSString *)key { if([self empty]) return nil; if(![_keyStack containsObject:key]) return nil; id ob = _inMemoryObjectsMap[key]; [_keyStack removeObject:key]; [_inMemoryObjectsMap removeObjectForKey:key]; [_typesMap removeObjectForKey:key]; [self preloadIfNeeded]; return ob; } - (void)preloadIfNeeded { for(NSString *key in self.keyStack.reverseObjectEnumerator){ Class typeClass = _typesMap[key]; id cache = _inMemoryObjectsMap[key]; if(typeClass && !cache && [typeClass conformsToProtocol: @protocol(FLBStackCacheObject)]){ _loadinMap[key] = @(YES); [typeClass loadFromFileWithKey:key queue:_queueIO cache:self completion:^(NSError *err ,id<FLBStackCacheObject> ob){ [self.loadinMap removeObjectForKey:key]; if (ob && !err) { if(self.typesMap[key]){ self.inMemoryObjectsMap[key] = ob; } }else{ NSLog(@"preload object from file failed!"); } }]; } if(_inMemoryObjectsMap.count + _loadinMap.count >= _inMemoryCount){ break; } } } - (NSString *)cacheDir { static NSString *cachePath = nil; if (!cachePath) { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); NSString *cacheDirectory = [paths objectAtIndex:0]; cachePath = [cacheDirectory stringByAppendingPathComponent:@"FlutterScreenshots"]; } BOOL dir = NO; if(![[NSFileManager defaultManager] fileExistsAtPath:cachePath isDirectory:&dir]){ NSError *eror = nil; [[NSFileManager defaultManager] createDirectoryAtPath:cachePath withIntermediateDirectories:YES attributes:nil error:&eror]; if (eror) { NSLog(@"%@",eror); } } return cachePath; } @end