private bool Add(string key, object item, Action <object> expireCallback, DateTimeOffset?absoluteExpire, TimeSpan?slidingExpire)
{
if (string.IsNullOrEmpty(key) || item == null)
{
return(false);
}
var options = new CacheItemOptions();
if (absoluteExpire.HasValue)
{
options.AbsoluteExpiration = absoluteExpire;
if (absoluteExpire >= DateTimeOffset.UtcNow)
{
return(false);
}
}
if (slidingExpire.HasValue)
{
options.SlidingExpiration = slidingExpire;
}
if (expireCallback != null)
{
options.ExpirationCallback = expireCallback;
}
return(Add(key, item, options));
}
private void ProcessCacheCleanupItem(string key, CacheItem item, CacheItemOptions options, DateTimeOffset currentTimestamp)
{
if (IsExpired(item, options, currentTimestamp))
{
ExpireItem(key, item);
}
}
public bool Add(string key, object item, CacheItemOptions options = null)
{
if (string.IsNullOrEmpty(key) || item == null)
{
return(false);
}
if (options == null)
{
options = new CacheItemOptions();
}
if (!options.AbsoluteExpiration.HasValue && !options.SlidingExpiration.HasValue && !options.AbsoluteExpirationRelativeToNow.HasValue)
{
options.SlidingExpiration = TimeSpan.FromHours(1);
}
var now = DateTimeOffset.UtcNow;
if (options.AbsoluteExpirationRelativeToNow.HasValue && !options.AbsoluteExpiration.HasValue)
{
options.AbsoluteExpiration = now + options.AbsoluteExpirationRelativeToNow.Value;
options.AbsoluteExpirationRelativeToNow = null;
}
if (_memoryCache.ContainsKey(key))
{
ExpireItem(key, _memoryCache[key]);
}
_memoryCache[key] = new CacheItem()
{
Options = options,
StoredObject = item,
LastAccess = now
};
#if DEBUG
PrintWarning($"Cached new item with key {key} with value {item}");
#endif
return(true);
}
private bool IsExpired(CacheItem item, CacheItemOptions options, DateTimeOffset current)
{
if (options.AbsoluteExpiration.HasValue)
{
if (options.AbsoluteExpiration <= current)
{
return(true);
}
}
if (options.SlidingExpiration.HasValue)
{
if ((current - item.LastAccess) <= options.SlidingExpiration.Value)
{
return(true);
}
}
return(false);
}
/// <summary>
/// 保存对象
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="key"></param>
/// <param name="value"></param>
/// <param name="options"></param>
/// <returns></returns>
public bool Set <T>(string key, T value, CacheItemOptions options)
{
RedisHelper.StartPipe(p => p.HMSet(key, SlidingSecsField, options.GetSlidingExpirationSecs(), ValueField, value).Expire(key, options.GetAbsluteExpirationSecs()));
return(true);
}