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//
// System.Web.UI.WebControls.DataSourceCacheManager
//
// Authors:
// Vladimir Krasnov (vladimirk@mainsoft.com)
//
// Mainsoft (www.mainsoft.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Web;
using System.Web.UI;
using System.Web.Caching;
using System.Collections;
using System.Collections.Specialized;
using System.Text;
namespace System.Web.UI.WebControls
{
internal class DataSourceCacheManager
{
readonly int cacheDuration;
readonly string cacheKeyDependency;
readonly string controlID;
readonly DataSourceCacheExpiry cacheExpirationPolicy;
readonly Control owner;
readonly HttpContext context;
internal DataSourceCacheManager (int cacheDuration, string cacheKeyDependency,
DataSourceCacheExpiry cacheExpirationPolicy, Control owner, HttpContext context)
{
this.cacheDuration = cacheDuration;
this.cacheKeyDependency = cacheKeyDependency;
this.cacheExpirationPolicy = cacheExpirationPolicy;
this.controlID = owner.UniqueID;
this.owner = owner;
this.context = context;
if (DataCache [controlID] == null)
DataCache [controlID] = new object ();
}
internal void Expire ()
{
DataCache [controlID] = new object ();
}
internal object GetCachedObject (string methodName, ParameterCollection parameters)
{
return DataCache [GetKeyFromParameters (methodName, parameters)];
}
internal void SetCachedObject (string methodName, ParameterCollection parameters, object o)
{
if (o == null)
return;
string key = GetKeyFromParameters (methodName, parameters);
if (DataCache [key] != null)
DataCache.Remove (key);
DateTime absoluteExpiration = Cache.NoAbsoluteExpiration;
TimeSpan slidindExpiraion = Cache.NoSlidingExpiration;
if (cacheDuration > 0) {
if (cacheExpirationPolicy == DataSourceCacheExpiry.Absolute)
absoluteExpiration = DateTime.Now.AddSeconds (cacheDuration);
else
slidindExpiraion = new TimeSpan (0, 0, cacheDuration);
}
string [] dependencies;
if (cacheKeyDependency.Length > 0)
dependencies = new string [] { cacheKeyDependency };
else
dependencies = new string [] { };
DataCache.Add (key, o, new CacheDependency (new string [] { }, dependencies),
absoluteExpiration, slidindExpiraion, CacheItemPriority.Default, null);
}
static Cache DataCache {
get {
if (HttpContext.Current != null)
return HttpContext.Current.InternalCache;
throw new InvalidOperationException ("HttpContext.Current is null.");
}
}
string GetKeyFromParameters (string methodName, ParameterCollection parameters)
{
StringBuilder sb = new StringBuilder (methodName);
if (owner != null)
sb.Append (owner.ID);
for (int i = 0; i < parameters.Count; i++) {
sb.Append (parameters [i].Name);
sb.Append (parameters [i].GetValue (context, owner));
}
return sb.ToString ();
}
}
}
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