class/System/System.Net.Configuration/ConnectionManagementHandler.cs

   1 //
   2 // System.Net.Configuration.ConnectionManagementHandler
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (C) 2003 Ximian, Inc (http://www.ximian.com)
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Collections;
  32 using System.Configuration;
  33 #if (XML_DEP)
  34 using System.Xml;
  35 #else
  36 using XmlNode = System.Object;
  37 #endif
  38
  39 namespace System.Net.Configuration
  40 {
  41         class ConnectionManagementData
  42         {
  43                 Hashtable data; // key -> address, value -> maxconnections
  44                 const int defaultMaxConnections = 2;
  45
  46                 public ConnectionManagementData (object parent)
  47                 {
  48                         data = new Hashtable (CaseInsensitiveHashCodeProvider.DefaultInvariant,
  49                                               CaseInsensitiveComparer.DefaultInvariant);
  50                         if (parent != null && parent is ConnectionManagementData) {
  51                                 ConnectionManagementData p = (ConnectionManagementData) parent;
  52                                 foreach (string k in p.data.Keys)
  53                                         data [k] = p.data [k];
  54                         }
  55                 }
  56
  57                 public void Add (string address, string nconns)
  58                 {
  59                         if (nconns == null || nconns == "")
  60                                 nconns = "2";
  61                         // Adding duplicates works fine under MS, so...
  62                         data [address] = UInt32.Parse (nconns);
  63                 }
  64
  65                 public void Add (string address, int nconns)
  66                 {
  67                         data [address] = (uint) nconns;
  68                 }
  69
  70                 public void Remove (string address)
  71                 {
  72                         // Removing non-existent address is fine.
  73                         data.Remove (address);
  74                 }
  75
  76                 public void Clear ()
  77                 {
  78                         data.Clear ();
  79                 }
  80
  81                 public uint GetMaxConnections (string hostOrIP)
  82                 {
  83                         object o = data [hostOrIP];
  84                         if (o == null)
  85                                 o = data ["*"];
  86
  87                         if (o == null)
  88                                 return defaultMaxConnections;
  89
  90                         return (uint) o;
  91                 }
  92
  93                 public Hashtable Data {
  94                         get { return data; }
  95                 }
  96         }
  97
  98         class ConnectionManagementHandler : IConfigurationSectionHandler
  99         {
 100                 public virtual object Create (object parent, object configContext, XmlNode section)
 101                 {
 102                         ConnectionManagementData cmd = new ConnectionManagementData (parent);
 103 #if (XML_DEP)
 104                         if (section.Attributes != null && section.Attributes.Count != 0)
 105                                 HandlersUtil.ThrowException ("Unrecognized attribute", section);
 106
 107                         XmlNodeList httpHandlers = section.ChildNodes;
 108                         foreach (XmlNode child in httpHandlers) {
 109                                 XmlNodeType ntype = child.NodeType;
 110                                 if (ntype == XmlNodeType.Whitespace || ntype == XmlNodeType.Comment)
 111                                         continue;
 112
 113                                 if (ntype != XmlNodeType.Element)
 114                                         HandlersUtil.ThrowException ("Only elements allowed", child);
 115
 116                                 string name = child.Name;
 117                                 if (name == "clear") {
 118                                         if (child.Attributes != null && child.Attributes.Count != 0)
 119                                                 HandlersUtil.ThrowException ("Unrecognized attribute", child);
 120
 121                                         cmd.Clear ();
 122                                         continue;
 123                                 }
 124
 125                                 //LAMESPEC: the MS doc says that <remove name="..."/> but they throw an exception
 126                                 // if you use that. "address" is correct.
 127
 128                                 string address = HandlersUtil.ExtractAttributeValue ("address", child);
 129                                 if (name == "add") {
 130                                         string maxcnc = HandlersUtil.ExtractAttributeValue ("maxconnection", child, true);
 131                                         if (child.Attributes != null && child.Attributes.Count != 0)
 132                                                 HandlersUtil.ThrowException ("Unrecognized attribute", child);
 133
 134                                         cmd.Add (address, maxcnc);
 135                                         continue;
 136                                 }
 137
 138                                 if (name == "remove") {
 139                                         if (child.Attributes != null && child.Attributes.Count != 0)
 140                                                 HandlersUtil.ThrowException ("Unrecognized attribute", child);
 141
 142                                         cmd.Remove (address);
 143                                         continue;
 144                                 }
 145
 146                                 HandlersUtil.ThrowException ("Unexpected element", child);
 147                         }
 148 #endif
 149
 150                         return cmd;
 151                 }
 152         }
 153
 154         internal class HandlersUtil
 155         {
 156                 private HandlersUtil ()
 157                 {
 158                 }
 159 #if (XML_DEP)
 160                 static internal string ExtractAttributeValue (string attKey, XmlNode node)
 161                 {
 162                         return ExtractAttributeValue (attKey, node, false);
 163                 }
 164
 165                 static internal string ExtractAttributeValue (string attKey, XmlNode node, bool optional)
 166                 {
 167                         if (node.Attributes == null) {
 168                                 if (optional)
 169                                         return null;
 170
 171                                 ThrowException ("Required attribute not found: " + attKey, node);
 172                         }
 173
 174                         XmlNode att = node.Attributes.RemoveNamedItem (attKey);
 175                         if (att == null) {
 176                                 if (optional)
 177                                         return null;
 178                                 ThrowException ("Required attribute not found: " + attKey, node);
 179                         }
 180
 181                         string value = att.Value;
 182                         if (value == String.Empty) {
 183                                 string opt = optional ? "Optional" : "Required";
 184                                 ThrowException (opt + " attribute is empty: " + attKey, node);
 185                         }
 186
 187                         return value;
 188                 }
 189
 190                 static internal void ThrowException (string msg, XmlNode node)
 191                 {
 192                         if (node != null && node.Name != String.Empty)
 193                                 msg = msg + " (node name: " + node.Name + ") ";
 194                         throw new ConfigurationException (msg, node);
 195                 }
 196 #endif
 197         }
 198 }
 199