118 lines
3.5 KiB
C#
118 lines
3.5 KiB
C#
//
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// System.Web.Compilation.AggregateCacheDependency
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//
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// Authors:
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// Marek Habersack (grendello@gmail.com)
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//
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// (C) 2006 Marek Habersack
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//
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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.Collections.Generic;
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using System.Text;
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using System.Web;
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namespace System.Web.Caching
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{
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public sealed class AggregateCacheDependency : CacheDependency
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{
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object dependenciesLock = new object();
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List <CacheDependency> dependencies;
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public AggregateCacheDependency ()
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{
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FinishInit ();
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}
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public void Add (params CacheDependency [] dependencies)
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{
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if (dependencies == null)
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throw new ArgumentNullException ("dependencies");
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if (dependencies.Length == 0)
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return;
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bool somethingChanged = false;
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foreach (CacheDependency dep in dependencies)
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if (dep == null || dep.IsUsed)
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throw new InvalidOperationException ("Cache dependency already in use");
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else if (!somethingChanged && dep != null && dep.HasChanged)
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somethingChanged = true;
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lock (dependenciesLock) {
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if (this.dependencies == null)
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this.dependencies = new List <CacheDependency> (dependencies.Length);
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foreach (CacheDependency dep in dependencies)
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if (dep != null)
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dep.DependencyChanged += new EventHandler (OnAnyChanged);
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this.dependencies.AddRange (dependencies);
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base.Start = DateTime.UtcNow;
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}
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if (somethingChanged)
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base.NotifyDependencyChanged (this, null);
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}
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public override string GetUniqueID ()
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{
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if (dependencies == null || dependencies.Count == 0)
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return null;
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StringBuilder sb = new StringBuilder ();
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lock (dependenciesLock) {
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string depid = null;
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foreach (CacheDependency dep in dependencies) {
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depid = dep.GetUniqueID ();
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if (String.IsNullOrEmpty (depid))
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return null;
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sb.Append (depid);
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sb.Append (';');
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}
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}
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return sb.ToString ();
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}
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protected override void DependencyDispose ()
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{
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// MSDN doesn't document it as being part of the class, but assembly
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// comparison shows that it does exist in this type, so we're just calling
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// the base class here
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base.DependencyDispose ();
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}
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internal override void DependencyDisposeInternal ()
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{
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if (dependencies != null && dependencies.Count > 0)
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foreach (CacheDependency dep in dependencies)
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dep.DependencyChanged -= new EventHandler (OnAnyChanged);
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}
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void OnAnyChanged (object sender, EventArgs args)
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{
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base.NotifyDependencyChanged (sender, args);
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}
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}
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}
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