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