namespace NewLife.Caching;

/// <summary>缓存接口</summary>
/// <remarks>
/// 文档 https://newlifex.com/core/icache
/// </remarks>
public interface ICache
{
    #region 属性
    /// <summary>名称</summary>
    String Name { get; }

    /// <summary>默认缓存时间。默认0秒表示不过期</summary>
    Int32 Expire { get; set; }

    /// <summary>获取和设置缓存，永不过期</summary>
    /// <param name="key"></param>
    /// <returns></returns>
    Object this[String key] { get; set; }

    /// <summary>缓存个数</summary>
    Int32 Count { get; }

    /// <summary>所有键</summary>
    ICollection<String> Keys { get; }
    #endregion

    #region 基础操作
    /// <summary>是否包含缓存项</summary>
    /// <param name="key"></param>
    /// <returns></returns>
    Boolean ContainsKey(String key);

    /// <summary>设置缓存项</summary>
    /// <param name="key">键</param>
    /// <param name="value">值</param>
    /// <param name="expire">过期时间，秒。小于0时采用默认缓存时间<seealso cref="Expire"/></param>
    /// <returns></returns>
    Boolean Set<T>(String key, T value, Int32 expire = -1);

    /// <summary>设置缓存项</summary>
    /// <param name="key">键</param>
    /// <param name="value">值</param>
    /// <param name="expire">过期时间</param>
    /// <returns></returns>
    Boolean Set<T>(String key, T value, TimeSpan expire);

    /// <summary>获取缓存项</summary>
    /// <param name="key">键</param>
    /// <returns></returns>
    T Get<T>(String key);

    /// <summary>批量移除缓存项</summary>
    /// <param name="keys">键集合</param>
    /// <returns></returns>
    Int32 Remove(params String[] keys);

    /// <summary>清空所有缓存项</summary>
    void Clear();

    /// <summary>设置缓存项有效期</summary>
    /// <param name="key">键</param>
    /// <param name="expire">过期时间</param>
    Boolean SetExpire(String key, TimeSpan expire);

    /// <summary>获取缓存项有效期</summary>
    /// <param name="key">键</param>
    /// <returns></returns>
    TimeSpan GetExpire(String key);
    #endregion

    #region 集合操作
    /// <summary>批量获取缓存项</summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="keys"></param>
    /// <returns></returns>
    IDictionary<String, T> GetAll<T>(IEnumerable<String> keys);

    /// <summary>批量设置缓存项</summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="values"></param>
    /// <param name="expire">过期时间，秒。小于0时采用默认缓存时间<seealso cref="Expire"/></param>
    void SetAll<T>(IDictionary<String, T> values, Int32 expire = -1);

    /// <summary>获取列表</summary>
    /// <typeparam name="T">元素类型</typeparam>
    /// <param name="key">键</param>
    /// <returns></returns>
    IList<T> GetList<T>(String key);

    /// <summary>获取哈希</summary>
    /// <typeparam name="T">元素类型</typeparam>
    /// <param name="key">键</param>
    /// <returns></returns>
    IDictionary<String, T> GetDictionary<T>(String key);

    /// <summary>获取队列</summary>
    /// <typeparam name="T">元素类型</typeparam>
    /// <param name="key">键</param>
    /// <returns></returns>
    IProducerConsumer<T> GetQueue<T>(String key);

    /// <summary>获取栈</summary>
    /// <typeparam name="T">元素类型</typeparam>
    /// <param name="key">键</param>
    /// <returns></returns>
    IProducerConsumer<T> GetStack<T>(String key);

    /// <summary>获取Set</summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="key"></param>
    /// <returns></returns>
    ICollection<T> GetSet<T>(String key);
    #endregion

    #region 高级操作
    /// <summary>添加，已存在时不更新</summary>
    /// <typeparam name="T">值类型</typeparam>
    /// <param name="key">键</param>
    /// <param name="value">值</param>
    /// <param name="expire">过期时间，秒。小于0时采用默认缓存时间<seealso cref="Cache.Expire"/></param>
    /// <returns></returns>
    Boolean Add<T>(String key, T value, Int32 expire = -1);

    /// <summary>设置新值并获取旧值，原子操作</summary>
    /// <remarks>
    /// 常常配合Increment使用，用于累加到一定数后重置归零，又避免多线程冲突。
    /// </remarks>
    /// <typeparam name="T">值类型</typeparam>
    /// <param name="key">键</param>
    /// <param name="value">值</param>
    /// <returns></returns>
    T Replace<T>(String key, T value);

    /// <summary>尝试获取指定键，返回是否包含值。有可能缓存项刚好是默认值，或者只是反序列化失败，解决缓存穿透问题</summary>
    /// <typeparam name="T">值类型</typeparam>
    /// <param name="key">键</param>
    /// <param name="value">值。即使有值也不一定能够返回，可能缓存项刚好是默认值，或者只是反序列化失败</param>
    /// <returns>返回是否包含值，即使反序列化失败</returns>
    Boolean TryGetValue<T>(String key, out T value);

    /// <summary>获取 或 添加 缓存数据，在数据不存在时执行委托请求数据</summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="key"></param>
    /// <param name="callback"></param>
    /// <param name="expire">过期时间，秒。小于0时采用默认缓存时间<seealso cref="Cache.Expire"/></param>
    /// <returns></returns>
    T GetOrAdd<T>(String key, Func<String, T> callback, Int32 expire = -1);

    /// <summary>累加，原子操作</summary>
    /// <param name="key">键</param>
    /// <param name="value">变化量</param>
    /// <returns></returns>
    Int64 Increment(String key, Int64 value);

    /// <summary>累加，原子操作</summary>
    /// <param name="key">键</param>
    /// <param name="value">变化量</param>
    /// <returns></returns>
    Double Increment(String key, Double value);

    /// <summary>递减，原子操作</summary>
    /// <param name="key">键</param>
    /// <param name="value">变化量</param>
    /// <returns></returns>
    Int64 Decrement(String key, Int64 value);

    /// <summary>递减，原子操作</summary>
    /// <param name="key">键</param>
    /// <param name="value">变化量</param>
    /// <returns></returns>
    Double Decrement(String key, Double value);
    #endregion

    #region 事务
    /// <summary>提交变更。部分提供者需要刷盘</summary>
    /// <returns></returns>
    Int32 Commit();

    /// <summary>申请分布式锁</summary>
    /// <param name="key">要锁定的key</param>
    /// <param name="msTimeout">锁等待时间，单位毫秒</param>
    /// <returns></returns>
    IDisposable AcquireLock(String key, Int32 msTimeout);

    /// <summary>申请分布式锁</summary>
    /// <param name="key">要锁定的key</param>
    /// <param name="msTimeout">锁等待时间，申请加锁时如果遇到冲突则等待的最大时间，单位毫秒</param>
    /// <param name="msExpire">锁过期时间，超过该时间如果没有主动释放则自动释放锁，必须整数秒，单位毫秒</param>
    /// <param name="throwOnFailure">失败时是否抛出异常，如果不抛出异常，可通过返回null得知申请锁失败</param>
    /// <returns></returns>
    IDisposable AcquireLock(String key, Int32 msTimeout, Int32 msExpire, Boolean throwOnFailure);
    #endregion

    #region 性能测试
    /// <summary>多线程性能测试</summary>
    /// <param name="rand">随机读写。顺序，每个线程多次操作一个key；随机，每个线程每次操作不同key</param>
    /// <param name="batch">批量操作。默认0不分批，分批仅针对随机读写，对顺序读写的单key操作没有意义</param>
    Int64 Bench(Boolean rand = false, Int32 batch = 0);
    #endregion
}