HttpApplicationState.cs :  » 2.6.4-mono-.net-core » System.Web » System » Web » C# / CSharp Open Source

// 
// System.Web.HttpApplicationState
//
// Author:
//   Patrik Torstensson
//

//
// 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.Threading;
using System.Collections.Specialized;
using System.Security.Permissions;

namespace System.Web{
  // CAS - no InheritanceDemand here as the class is sealed
  [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  public sealed class HttpApplicationState : NameObjectCollectionBase 
  {
    HttpStaticObjectsCollection _AppObjects;
    HttpStaticObjectsCollection _SessionObjects;

    ReaderWriterLock _Lock; 

    internal HttpApplicationState ()
    {
      // do not use the public (empty) ctor as it required UnmanagedCode permission
      _AppObjects = new HttpStaticObjectsCollection (this);
      _SessionObjects = new HttpStaticObjectsCollection (this);
      _Lock = new ReaderWriterLock ();
    }

    internal HttpApplicationState (HttpStaticObjectsCollection AppObj,
      HttpStaticObjectsCollection SessionObj)
    {
      if (null != AppObj) 
      {
        _AppObjects = AppObj;
      } 
      else 
      {
        // do not use the public (empty) ctor as it required UnmanagedCode permission
        _AppObjects = new HttpStaticObjectsCollection (this);
      }

      if (null != SessionObj) 
      {
        _SessionObjects = SessionObj;
      } 
      else 
      {
        // do not use the public (empty) ctor as it required UnmanagedCode permission
        _SessionObjects = new HttpStaticObjectsCollection (this);
      }
      _Lock = new ReaderWriterLock ();
    }

    public void Add (string name, object value)
    {
      _Lock.AcquireWriterLock (-1); 
      try 
      {
        BaseAdd (name, value);
      } 
      finally 
      {
        _Lock.ReleaseWriterLock ();
      }
    }

    public void Clear ()
    {
      _Lock.AcquireWriterLock (-1); 
      try 
      {
        BaseClear ();
      } 
      finally 
      {
        _Lock.ReleaseWriterLock ();
      }
    } 

    public object Get (string name)
    {
      object ret = null;

      _Lock.AcquireReaderLock (-1); 
      try 
      {
        ret = BaseGet (name);
      } 
      finally 
      {
        _Lock.ReleaseReaderLock ();
      }

      return ret;
    }

    public object Get (int index)
    {
      object ret = null;

      _Lock.AcquireReaderLock (-1); 
      try 
      {
        ret = BaseGet (index);
      } 
      finally 
      {
        _Lock.ReleaseReaderLock ();
      }

      return ret;
    }   

    public string GetKey (int index)
    {
      string ret = null;

      _Lock.AcquireReaderLock (-1); 
      try 
      {
        ret = BaseGetKey (index);
      } 
      finally 
      {
        _Lock.ReleaseReaderLock ();
      }

      return ret;
    }      

    public void Lock ()
    {
      _Lock.AcquireWriterLock (-1);
    }

    public void Remove (string name)
    {
      _Lock.AcquireWriterLock (-1); 
      try 
      {
        BaseRemove (name);
      } 
      finally 
      {
        _Lock.ReleaseWriterLock ();
      }      
    }

    public void RemoveAll ()
    {
      Clear ();
    }

    public void RemoveAt (int index)
    {
      _Lock.AcquireWriterLock (-1); 
      try 
      {
        BaseRemoveAt (index);
      } 
      finally 
      {
        _Lock.ReleaseWriterLock ();
      }      
    }

    public void Set (string name, object value)
    {
      _Lock.AcquireWriterLock (-1); 
      try 
      {
        BaseSet (name, value);
      } 
      finally 
      {
        _Lock.ReleaseWriterLock ();
      }      
    }   

    public void UnLock ()
    {
      _Lock.ReleaseWriterLock ();
    }

    public string [] AllKeys 
    {
      get 
      {
        string [] ret = null;

        _Lock.AcquireReaderLock (-1); 
        try 
        {
          ret = BaseGetAllKeys ();
        } 
        finally 
        {
          _Lock.ReleaseReaderLock ();
        }     

        return ret;
      }
    }

    public HttpApplicationState Contents 
    {
      get { return this; }
    }

    public override int Count 
    {
      get 
      {
        int ret = 0;

        _Lock.AcquireReaderLock (-1); 
        try 
        {
          ret = base.Count;
        } 
        finally 
        {
          _Lock.ReleaseReaderLock ();
        }     

        return ret;
      }
    }   

    public object this [string name] 
    {
      get { return Get (name); }
      set { Set (name, value); }
    }

    public object this [int index] 
    {
      get { return Get (index); }
    }

    //  ASP Session based objects
    internal HttpStaticObjectsCollection SessionObjects 
    {
      get { return _SessionObjects; }
    }

    //  ASP App based objects
    public HttpStaticObjectsCollection StaticObjects 
    {
      get { return _AppObjects; }
    }
  }
}