在个人中心里面清空了所有的Cache,但在进入收藏的时候,个人资料缓存还是没有清空,请问有没可以立即同步的选项? 我用YYCache做了登录之后的个人资料,cookie的保存. 然后,我在每次请求数据的时候,将保存的数据加入到请求头(cookie)里面,用来验证用户. 但我在别的页面清楚所有的Cache之后(RemoveAll),再请求数据发现,并没有清除掉, 用户信息还是保留着. 所以,我想问一下有没有立即执行的选项.

The file creation part from YYKVStorage.m:

    NSError *error = nil;
    if (![[NSFileManager defaultManager] createDirectoryAtPath:path
                                   withIntermediateDirectories:YES
                                                    attributes:nil
                                                         error:&error] ||
        ![[NSFileManager defaultManager] createDirectoryAtPath:[path stringByAppendingPathComponent:kDataDirectoryName]
                                   withIntermediateDirectories:YES
                                                    attributes:nil
                                                         error:&error] ||
        ![[NSFileManager defaultManager] createDirectoryAtPath:[path stringByAppendingPathComponent:kTrashDirectoryName]
                                   withIntermediateDirectories:YES
                                                    attributes:nil
                                                         error:&error]) {
        NSLog(@"YYKVStorage init error:%@", error);
        return nil;
    }

This will not result in an error if directory already exists.

Is it possible to set the maximum cache usage to a custom value? If not that would be a great idea to implement. I am using YYImage which caches all images automatically (which is great). But it would be useful if we could change the maximum size of the cache manually.

libsystem_kernel.dylib fcntl + 8 1 libsystem_kernel.dylib fcntl + 128 2 libsqlite3.dylib sqlite3_free_table + 49568 3 libsqlite3.dylib sqlite3_wal_checkpoint + 3456 4 libsqlite3.dylib sqlite3_bind_int64 + 7480 5 libsqlite3.dylib sqlite3_bind_int64 + 6604 6 libsqlite3.dylib sqlite3_bind_int64 + 4892 7 libsqlite3.dylib sqlite3_backup_finish + 756 8 libsqlite3.dylib sqlite3_total_changes + 1024 9 ShunLianPower -YYKVStorage _dbClose 10 ShunLianPower -YYKVStorage dealloc 11 libobjc.A.dylib object_cxxDestructFromClass(objc_object_, objc_class_) + 148 12 libobjc.A.dylib objc_destructInstance + 92 13 libobjc.A.dylib object_dispose + 28 14 ShunLianPower -YYDiskCache dealloc 15 ShunLianPower -YYCache .cxx_destruct 16 libobjc.A.dylib object_cxxDestructFromClass(objc_object_, objc_class_) + 148 17 libobjc.A.dylib objc_destructInstance + 92 18 libobjc.A.dylib object_dispose + 28 19 ShunLianPower destroy_helper_block (SLHttpRequest.m:0) 20 libsystem_blocks.dylib Block_release + 156 21 ShunLianPower -AFURLSessionManagerTaskDelegate .cxx_destruct 22 libobjc.A.dylib object_cxxDestructFromClass(objc_object, objc_class) + 148 23 libobjc.A.dylib objc_destructInstance + 92 24 libobjc.A.dylib object_dispose + 28 25 ShunLianPower _destroy_helper_block (AFURLSessionManager.m:0) 26 libsystem_blocks.dylib _Block_release + 156 27 libdispatch.dylib __dispatch_client_callout + 16 28 libdispatch.dylib _dispatch_main_queue_callback_4CF + 1844 29 CoreFoundation ___CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE + 12 30 CoreFoundation ___CFRunLoopRun + 1628 31 CoreFoundation CFRunLoopRunSpecific + 384 32 GraphicsServices GSEventRunModal + 180 33 UIKit UIApplicationMain + 204 34 ShunLianPower main (main.m:14) 35 libdyld.dylib _start + 4

想用YYCache来存储本地编辑的图片，测试用几张比较大的图片 1.5M~2M左右，存储完成后在block中移除内存中的图片数据，同时再去获取发现数据为空。当然如果把图片改成一个NSString是正常的。 测试代码：

// 初始化
    self.yycache = [[YYCache alloc] initWithName:@"yycachedemo"];

// 编辑并保存
- (void)store {
    self.index += 1;
    UIImage *imageToStore = [UIImage imageNamed:[NSString stringWithFormat:@"pic%@.jpg",@(self.index)]];

    __weak typeof(self) weakSelf = self;
    NSString *key = [self keyWithIndex:self.index];
//    NSString *strToStore = key;
    [self.yycache setObject:imageToStore forKey:key withBlock:^{
        [weakSelf.yycache.memoryCache removeObjectForKey:key];

        id obj = [weakSelf.yycache objectForKey:key];
        NSLog(@"get stored obj %@",obj);
//        [weakSelf.yycache objectForKey:key withBlock:^(NSString * _Nonnull key, id<NSCoding>  _Nonnull object) {
//            NSLog(@"get stored obj %@",object);
//        }];
    }];
    self.imageView.image = imageToStore;
}

- (NSString *)keyWithIndex:(NSInteger)index {
    return [NSString stringWithFormat:@"image%@",@(index)];
}

不知是否是使用方法不当，

YYCache *cache = [[YYCache alloc] initWithName:JoyHomeUserCacheName]; NSDictionary *userDic = (NSDictionary *)[cache objectForKey:JoyHomeUserModelCache]; 缓存成功后 有时候取出数据为空

1.数据库操作是否可以提供分页查询的功能,例如

• (NSArray *)objectsWithPage:(NSInteger)page pageCount(NSInteger)pageCount;

2.如果我存的是model对象,例如model有个属性是age,目前是把model归档后存为二进制的,如果我查询数据库,想查age大于20的,目前这样的缓存用起来还不是很方便,有什么好的办法

你好，感谢你分享的YYCache项目，我们在项目中有使用，在使用过程中我们发现一个问题： _dbOpen函数在某些情况下由于打开sqlite数据库失败，但是内部状态维护有点问题，具体是场景是：图片缓存被多次清理，在某次清理时打开sqlite数据库返回SQLITE_CANTOPEN，_dbOpen函数返回了NO，但是内部状态，db，_invalidated等状态都标示为打开成功状态，在下次使用图片缓存时由于_dbStmtCache被置为NULL，导致crash。 这里存在的问题还和sqlite的API有关系，int result = sqlite3_open(_dbPath.UTF8String, &_db);在返回失败是，db被赋值了

清理磁盘存储的时候，经常会崩溃在这一句。

sqlite3_stmt *stmt = (sqlite3_stmt *)CFDictionaryGetValue(_dbStmtCache, (__bridge const void *)(sql));

具体在下面这个函数中，报错是Thread34：EXC_BAD_ACCESS

- (sqlite3_stmt *)_dbPrepareStmt:(NSString *)sql { if (![self _dbIsReady]) return NULL; sqlite3_stmt *stmt = (sqlite3_stmt *)CFDictionaryGetValue(_dbStmtCache, (__bridge const void *)(sql)); if (!stmt) { int result = sqlite3_prepare_v2(_db, sql.UTF8String, -1, &stmt, NULL); if (result != SQLITE_OK) { if (_errorLogsEnabled) NSLog(@"%s line:%d sqlite stmt prepare error (%d): %s", __FUNCTION__, __LINE__, result, sqlite3_errmsg(_db)); return NULL; } CFDictionarySetValue(_dbStmtCache, (__bridge const void *)(sql), stmt); } else { sqlite3_reset(stmt); } return stmt; }

• (int)_dbGetItemCountWithKey:(NSString *)key { NSString *sql = @"select count(key) from manifest where key = ?1;"; sqlite3_stmt *stmt = [self _dbPrepareStmt:sql]; if (!stmt) return -1; sqlite3_bind_text(stmt, 1, key.UTF8String, -1, NULL); int result = sqlite3_step(stmt); if (result != SQLITE_ROW) { if (_errorLogsEnabled) NSLog(@"%s line:%d sqlite query error (%d): %s", FUNCTION, LINE, result, sqlite3_errmsg(_db)); return -1; } return sqlite3_column_int(stmt, 0); }

你好，YYKVStorage.m 中获取最近访问数据时，是否应该使用 asc 而不是 desc。最近的时间值更大。使用 desc 导致每次移除时把最近使用的元素优先移除掉了。

- (BOOL)removeItemsToFitCount:(int)maxCount {
        items = [self _dbGetItemSizeInfoOrderByTimeDescWithLimit:perCount];

- (NSMutableArray *)_dbGetItemSizeInfoOrderByTimeDescWithLimit:(int)count {
    NSString *sql = @"select key, filename, size from manifest order by last_access_time desc limit ?1;";
    sqlite3_stmt *stmt = [self _dbPrepareStmt:sql];

测试代码如下：

    dispatch_async(dispatch_get_global_queue(0, 0), ^{
        NSString *docDir = [(NSArray*)NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];
        NSString *testDir = [docDir stringByAppendingPathComponent:@"testDir"];
        NSLog(@"testDir = %@", testDir);

        YYDiskCache *diskCache = [[YYDiskCache alloc]initWithPath:testDir inlineThreshold:0];
        diskCache.customFileNameBlock = ^(NSString *key){
            return [key stringByAppendingPathExtension:@"txt"];
        };

        [diskCache setObject:@"hello" forKey:@"1"];
        [diskCache setObject:@"world" forKey:@"2"];

        NSLog(@"total count : %@",@([diskCache totalCount]));
//        NSLog(@"key 1 = %@", [diskCache objectForKey:@"1"]);
//        usleep(1000000);
//        NSLog(@"key 2 = %@", [diskCache objectForKey:@"2"]);

        NSLog(@"key 2 = %@", [diskCache objectForKey:@"2"]);
        usleep(1000000);
        NSLog(@"key 1 = %@", [diskCache objectForKey:@"1"]);

        [diskCache trimToCount:1];
        NSLog(@"total count : %@",@([diskCache totalCount]));
        NSLog(@"key 1 = %@", [diskCache objectForKey:@"1"]);
        NSLog(@"key 2 = %@", [diskCache objectForKey:@"2"]);
    });

输出如下：

2016-03-28 00:47:00.696 YYCacheTest[55228:1046537] total count : 2
2016-03-28 00:47:00.697 YYCacheTest[55228:1046537] key 2 = world
2016-03-28 00:47:01.700 YYCacheTest[55228:1046537] key 1 = hello
2016-03-28 00:47:01.701 YYCacheTest[55228:1046537] total count : 1
2016-03-28 00:47:01.701 YYCacheTest[55228:1046537] key 1 = (null)
2016-03-28 00:47:01.702 YYCacheTest[55228:1046537] key 2 = world

在最近访问 key1之后，应该优先移除 key2。但目前是移除了key1的值。

删除节点的代码中_dic似乎是想要持有所有的Node，在队列中释放。

Node节点也注释说不持有前后节点，交给字典管理。

但是Map中的字典在赋值的时候用的却是__bridge，不转交对象管辖权，那么字典中的value应该无法持有Node节点才对？

@interface _YYLinkedMapNode : NSObject {
    @package
    __unsafe_unretained _YYLinkedMapNode *_prev; // retained by dic
    __unsafe_unretained _YYLinkedMapNode *_next; // retained by dic
...
}
@end
...
- (void)insertNodeAtHead:(_YYLinkedMapNode *)node {
    CFDictionarySetValue(_dic, (__bridge const void *)(node->_key), (__bridge const void *)(node));
   ...
}
- (void)removeAll {
     ...
    if (CFDictionaryGetCount(_dic) > 0) {
        CFMutableDictionaryRef holder = _dic;
        _dic = CFDictionaryCreateMutable(CFAllocatorGetDefault(), 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
        
        if (_releaseAsynchronously) {
            dispatch_queue_t queue = _releaseOnMainThread ? dispatch_get_main_queue() : YYMemoryCacheGetReleaseQueue();
            dispatch_async(queue, ^{
                CFRelease(holder); // hold and release in specified queue
            });
        }
       ...
    }
}

YYCache *cache = [[YYCache alloc]initWithName: CacheKeyUserManager]; [cache setObject:_strServerIP forKey: KeyStrServerIP]; 你好，我想咨询一下，这种方式创建保存数据 部分手机型号的反馈会自动清除。

• (NSData *)archivedDataWithRootObject:(id)rootObject API_DEPRECATED("Use +archivedDataWithRootObject:requiringSecureCoding:error: instead", macosx(10.2,10.14), ios(2.0,12.0), watchos(2.0,5.0), tvos(9.0,12.0));
• (nullable id)unarchiveObjectWithFile:(NSString *)path API_DEPRECATED("Use +unarchivedObjectOfClass:fromData:error: instead", macosx(10.2,10.14), ios(2.0,12.0), watchos(2.0,5.0), tvos(9.0,12.0));

如题，在对本地缓存异步读取的时候很频繁的发生这样的错误，然后缓存被删，gg。 -[YYKVStorage _dbExecute:] line:182 sqlite exec error (5): database is locked 2019-12-17 11:38:58.225945+0800 xxxxx[389:27234] [logging] BUG IN CLIENT OF libsqlite3.dylib: database integrity compromised by API violation: vnode unlinked while in use: /private/var/mobile/Containers/Data/Application/6A2C58F1-C93F-4B4E-A16A-014532078A6C/Library/Caches/CacheOfChapters/manifest.sqlite-shm