objective c test code

gistfile1.m

+ (ImageCache *) sharedInstance {
    if (instance == nil) {
        @synchronized(self) {
            if (instance == nil) {
                instance = [[ImageCache alloc] init];
            }
        }
    }
    return instance;
}

- (id) init {
    if (self = [super init]) {
        self.cachePath = NSTemporaryDirectory();
        self.fileManager = [NSFileManager defaultManager];
        self.memoryCache = [[NSMutableDictionary alloc] initWithCapacity:MAX_MEMORY_CACHE_NUMBER];
        self.memoryCacheKeys = [[NSMutableArray alloc] initWithCapacity:MAX_MEMORY_CACHE_NUMBER];
        return self;
    }
    return self;
}