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//
// Authors:
// Marek Habersack <mhabersack@novell.com>
//
// (C) 2010 Novell, Inc (http://novell.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.Configuration;
using System.Configuration.Provider;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Security.Permissions;
using System.Web;
using System.Web.Configuration;
namespace System.Web.Caching
{
public static class OutputCache
{
internal const string DEFAULT_PROVIDER_NAME = "AspNetInternalProvider";
static readonly object initLock = new object ();
static readonly object defaultProviderInitLock = new object();
static bool initialized;
static string defaultProviderName;
static OutputCacheProviderCollection providers;
static OutputCacheProvider defaultProvider;
public static string DefaultProviderName {
get {
Init ();
if (String.IsNullOrEmpty (defaultProviderName))
return DEFAULT_PROVIDER_NAME;
return defaultProviderName;
}
}
internal static OutputCacheProvider DefaultProvider {
get {
if (defaultProvider == null) {
lock (defaultProviderInitLock) {
if (defaultProvider == null)
defaultProvider = new InMemoryOutputCacheProvider ();
}
}
return defaultProvider;
}
}
public static OutputCacheProviderCollection Providers {
get {
Init ();
return providers;
}
}
[SecurityPermission (SecurityAction.Assert, Flags = SecurityPermissionFlag.SerializationFormatter)]
public static object Deserialize (Stream stream)
{
if (stream == null)
throw new ArgumentNullException ("stream");
object o = new BinaryFormatter ().Deserialize (stream);
if (o == null || IsInvalidType (o))
throw new ArgumentException ("The provided parameter is not of a supported type for serialization and/or deserialization.");
return o;
}
[SecurityPermission (SecurityAction.Assert, Flags = SecurityPermissionFlag.SerializationFormatter)]
public static void Serialize (Stream stream, object data)
{
if (stream == null)
throw new ArgumentNullException ("stream");
// LAMESPEC: data == null doesn't throw ArgumentNullException
if (data == null || IsInvalidType (data))
throw new ArgumentException ("The provided parameter is not of a supported type for serialization and/or deserialization.");
new BinaryFormatter ().Serialize (stream, data);
}
internal static OutputCacheProvider GetProvider (string providerName)
{
if (String.IsNullOrEmpty (providerName))
return null;
if (String.Compare (providerName, DEFAULT_PROVIDER_NAME, StringComparison.Ordinal) == 0)
return DefaultProvider;
OutputCacheProviderCollection providers = OutputCache.Providers;
return (providers != null ? providers [providerName] : null);
}
static bool IsInvalidType (object data)
{
return !(data is MemoryResponseElement) &&
!(data is FileResponseElement) &&
!(data is SubstitutionResponseElement);
}
static void Init ()
{
if (initialized)
return;
lock (initLock) {
if (initialized)
return;
var cfg = WebConfigurationManager.GetWebApplicationSection ("system.web/caching/outputCache") as OutputCacheSection;
ProviderSettingsCollection cfgProviders = cfg.Providers;
defaultProviderName = cfg.DefaultProviderName;
if (cfgProviders != null && cfgProviders.Count > 0) {
var coll = new OutputCacheProviderCollection ();
foreach (ProviderSettings ps in cfgProviders)
coll.Add (LoadProvider (ps));
coll.SetReadOnly ();
providers = coll;
}
initialized = true;
}
}
static OutputCacheProvider LoadProvider (ProviderSettings ps)
{
Type type = HttpApplication.LoadType (ps.Type, false);
if (type == null)
throw new ConfigurationErrorsException (String.Format ("Could not load type '{0}'.", ps.Type));
var ret = Activator.CreateInstance (type) as OutputCacheProvider;
ret.Initialize (ps.Name, ps.Parameters);
return ret;
}
internal static void RemoveFromProvider (string key, string providerName)
{
if (providerName == null)
return;
OutputCacheProviderCollection providers = Providers;
OutputCacheProvider provider;
if (providers == null || providers.Count == 0)
provider = null;
else
provider = providers [providerName];
if (provider == null)
throw new ProviderException ("Provider '" + providerName + "' was not found.");
provider.Remove (key);
}
}
}
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