/// <summary>
/// 向列表尾添加元素，若 key 对应无列表缓存，则自动创建并添加一个元素。
/// </summary>
/// <param name="key">主键。</param>
/// <param name="value">要缓存的值。</param>
/// <param name="options">缓存时间设置，为 NULL 表示永久。</param>
public async Task RightPushListCacheAsync(string key, string value, KolibreCacheOptions options)
{
ConditionalValue <CacheWrapper> state = await StateManager.TryGetStateAsync <CacheWrapper>(key);
CacheWrapper cacheWrapper = new CacheWrapper(CacheType.List);
if (state.HasValue)
{
if (cacheWrapper.CacheType != CacheType.List)
{
throw new InvalidOperationException($"Operation against a key holding the wrong type '{cacheWrapper.CacheType}'.");
}
if (!state.Value.IsExpired())
{
cacheWrapper = state.Value;
}
}
List <string> caches;
try
{
caches = cacheWrapper.Cache.FromJson <List <string> >() ?? new List <string>();
}
catch
{
throw new InvalidOperationException($"Operation against a key holding the wrong type '{cacheWrapper.CacheType}'.");
}
caches.Insert(caches.Count, value);
CacheWrapper result = cacheWrapper.SetCache(caches.ToJson(), CacheType.List, options);
await StateManager.SetStateAsync(key, result);
}
/// <summary>
/// 设置 Hash 缓存。
/// </summary>
/// <param name="firstKey">主键。</param>
/// <param name="secondKey">次键。</param>
/// <param name="value">要缓存的值。</param>
/// <param name="options">缓存时间设置，为 NULL 表示永久。</param>
public async Task SetHashCacheAsync(string firstKey, string secondKey, string value, KolibreCacheOptions options)
{
ConditionalValue <CacheWrapper> state = await StateManager.TryGetStateAsync <CacheWrapper>(firstKey);
CacheWrapper cacheWrapper = state.HasValue ? state.Value : new CacheWrapper(CacheType.Hash);
if (cacheWrapper.CacheType != CacheType.Hash)
{
throw new InvalidOperationException($"Operation against a key holding the wrong type '{cacheWrapper.CacheType}'.");
}
// 若设置 Hash Cache 时，值不是 Dictionary<string,string> 类型，抛出异常
Dictionary <string, string> hashCacheWrappers;
try
{
hashCacheWrappers = cacheWrapper.Cache.FromJson <Dictionary <string, string> >() ?? new Dictionary <string, string>();
}
catch
{
throw new InvalidOperationException($"Operation against a key holding the wrong type '{cacheWrapper.CacheType}'.");
}
hashCacheWrappers[secondKey] = value;
CacheWrapper result = cacheWrapper.SetCache(hashCacheWrappers.ToJson(), CacheType.Hash, options);
await StateManager.SetStateAsync(firstKey, result);
}
