/// <summary>
/// 将缓存项持久化到设备
/// </summary>
/// <param name="cacheItem"></param>
protected virtual void SaveCacheItem( CacheItem cacheItem )
{
using ( var stream = CreateSaveStream( cacheItem.CacheToken ) )
{
Serialize( cacheItem, stream );
}
}
/// <summary>
/// 插入缓存项
/// </summary>
/// <param name="cacheItem"></param>
public virtual void InsertCacheItem( CacheItem cacheItem )
{
if ( !cacheItem.IsValid() )//缓存已过期
return;
SaveCacheItem( cacheItem );
}
/// <summary>
/// 序列化缓存项
/// </summary>
/// <param name="cacheItem"></param>
/// <param name="stream"></param>
protected virtual void Serialize( CacheItem cacheItem, Stream stream )
{
var formatter = new BinaryFormatter();
formatter.Serialize( stream, cacheItem );
}
/// <summary>
/// 插入缓存项
/// </summary>
/// <param name="cacheItem"></param>
public override void InsertCacheItem( CacheItem cacheItem )
{
if ( EnableMemoryCache )
HttpRuntime.Cache.InsertCacheItem( cacheItem );
base.InsertCacheItem( cacheItem );
}
/// <summary>
/// 获取 CacheItem
/// </summary>
/// <returns></returns>
public CacheItem GetCacheItem()
{
if ( _cacheItem == null )
_cacheItem = CacheStorageProvider.GetCacheItem( CacheToken );
if ( _cacheItem != null && _cacheItem.IsValid() )//确保缓存未过期
return _cacheItem;
return null;
}