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