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

//
// System.Net.WebConnectionGroup
//
// Authors:
//  Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (C) 2003 Ximian, Inc (http://www.ximian.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;
using System.Collections;
using System.Net.Configuration;
using System.Net.Sockets;

namespace System.Net{
  class WebConnectionGroup
  {
    ServicePoint sPoint;
    string name;
    ArrayList connections;
    Random rnd;
    Queue queue;

    public WebConnectionGroup (ServicePoint sPoint, string name)
    {
      this.sPoint = sPoint;
      this.name = name;
      connections = new ArrayList (1);
      queue = new Queue ();
    }

    public void Close ()
    {
      //TODO: what do we do with the queue? Empty it out and abort the requests?
      //TODO: abort requests or wait for them to finish
      lock (connections) {
        WeakReference cncRef = null;

        int end = connections.Count;
        // ArrayList removed = null;
        for (int i = 0; i < end; i++) {
          cncRef = (WeakReference) connections [i];
          WebConnection cnc = cncRef.Target as WebConnection;
          if (cnc != null) {
            cnc.Close (false);
          }
        }
        connections.Clear ();
      }
    }

    public WebConnection GetConnection (HttpWebRequest request)
    {
      WebConnection cnc = null;
      lock (connections) {
        WeakReference cncRef = null;

        // Remove disposed connections
        int end = connections.Count;
        ArrayList removed = null;
        for (int i = 0; i < end; i++) {
          cncRef = (WeakReference) connections [i];
          cnc = cncRef.Target as WebConnection;
          if (cnc == null) {
            if (removed == null)
              removed = new ArrayList (1);

            removed.Add (i);
          }
        }

        if (removed != null) {
          for (int i = removed.Count - 1; i >= 0; i--)
            connections.RemoveAt ((int) removed [i]);
        }

        cnc = CreateOrReuseConnection (request);
      }

      return cnc;
    }

    static void PrepareSharingNtlm (WebConnection cnc, HttpWebRequest request)
    {
      if (!cnc.NtlmAuthenticated)
        return;

      bool needs_reset = false;
      NetworkCredential cnc_cred = cnc.NtlmCredential;
      NetworkCredential req_cred = request.Credentials.GetCredential (request.RequestUri, "NTLM");
      if (cnc_cred.Domain != req_cred.Domain || cnc_cred.UserName != req_cred.UserName ||
        cnc_cred.Password != req_cred.Password) {
        needs_reset = true;
      }
#if NET_1_1
      if (!needs_reset) {
        bool req_sharing = request.UnsafeAuthenticatedConnectionSharing;
        bool cnc_sharing = cnc.UnsafeAuthenticatedConnectionSharing;
        needs_reset = (req_sharing == false || req_sharing != cnc_sharing);
      }
#endif
      if (needs_reset) {
        cnc.Close (false); // closes the authenticated connection
        cnc.ResetNtlm ();
      }
    }

    WebConnection CreateOrReuseConnection (HttpWebRequest request)
    {
      // lock is up there.
      WebConnection cnc;
      WeakReference cncRef;

      int count = connections.Count;
      for (int i = 0; i < count; i++) {
        WeakReference wr = connections [i] as WeakReference;
        cnc = wr.Target as WebConnection;
        if (cnc == null) {
          connections.RemoveAt (i);
          count--;
          i--;
          continue;
        }

        if (cnc.Busy)
          continue;

        PrepareSharingNtlm (cnc, request);
        return cnc;
      }

      if (sPoint.ConnectionLimit > count) {
        cnc = new WebConnection (this, sPoint);
        connections.Add (new WeakReference (cnc));
        return cnc;
      }

      if (rnd == null)
        rnd = new Random ();

      int idx = (count > 1) ? rnd.Next (0, count - 1) : 0;
      cncRef = (WeakReference) connections [idx];
      cnc = cncRef.Target as WebConnection;
      if (cnc == null) {
        cnc = new WebConnection (this, sPoint);
        connections.RemoveAt (idx);
        connections.Add (new WeakReference (cnc));
      }
      return cnc;
    }

    public string Name {
      get { return name; }
    }

    internal Queue Queue {
      get { return queue; }
    }
    
  }
}