mcs/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 #pragma warning disable 618
  40
  41 namespace System.Net.Configuration
  42 {
  43         class ConnectionManagementData
  44         {
  45                 Hashtable data; // key -> address, value -> maxconnections
  46                 const int defaultMaxConnections = 2;
  47
  48                 public ConnectionManagementData (object parent)
  49                 {
  50                         data = new Hashtable (CaseInsensitiveHashCodeProvider.DefaultInvariant,
  51                                               CaseInsensitiveComparer.DefaultInvariant);
  52                         if (parent != null && parent is ConnectionManagementData) {
  53                                 ConnectionManagementData p = (ConnectionManagementData) parent;
  54                                 foreach (string k in p.data.Keys)
  55                                         data [k] = p.data [k];
  56                         }
  57                 }
  58
  59                 public void Add (string address, string nconns)
  60                 {
  61                         if (nconns == null || nconns == "")
  62                                 nconns = "2";
  63                         // Adding duplicates works fine under MS, so...
  64                         data [address] = UInt32.Parse (nconns);
  65                 }
  66
  67                 public void Add (string address, int nconns)
  68                 {
  69                         data [address] = (uint) nconns;
  70                 }
  71
  72                 public void Remove (string address)
  73                 {
  74                         // Removing non-existent address is fine.
  75                         data.Remove (address);
  76                 }
  77
  78                 public void Clear ()
  79                 {
  80                         data.Clear ();
  81                 }
  82
  83                 public uint GetMaxConnections (string hostOrIP)
  84                 {
  85                         object o = data [hostOrIP];
  86                         if (o == null)
  87                                 o = data ["*"];
  88
  89                         if (o == null)
  90                                 return defaultMaxConnections;
  91
  92                         return (uint) o;
  93                 }
  94
  95                 public Hashtable Data {
  96                         get { return data; }
  97                 }
  98         }
  99
 100         class ConnectionManagementHandler : IConfigurationSectionHandler
 101         {
 102                 public virtual object Create (object parent, object configContext, XmlNode section)
 103                 {
 104                         ConnectionManagementData cmd = new ConnectionManagementData (parent);
 105 #if (XML_DEP)
 106                         if (section.Attributes != null && section.Attributes.Count != 0)
 107                                 HandlersUtil.ThrowException ("Unrecognized attribute", section);
 108
 109                         XmlNodeList httpHandlers = section.ChildNodes;
 110                         foreach (XmlNode child in httpHandlers) {
 111                                 XmlNodeType ntype = child.NodeType;
 112                                 if (ntype == XmlNodeType.Whitespace || ntype == XmlNodeType.Comment)
 113                                         continue;
 114
 115                                 if (ntype != XmlNodeType.Element)
 116                                         HandlersUtil.ThrowException ("Only elements allowed", child);
 117
 118                                 string name = child.Name;
 119                                 if (name == "clear") {
 120                                         if (child.Attributes != null && child.Attributes.Count != 0)
 121                                                 HandlersUtil.ThrowException ("Unrecognized attribute", child);
 122
 123                                         cmd.Clear ();
 124                                         continue;
 125                                 }
 126
 127                                 //LAMESPEC: the MS doc says that <remove name="..."/> but they throw an exception
 128                                 // if you use that. "address" is correct.
 129
 130                                 string address = HandlersUtil.ExtractAttributeValue ("address", child);
 131                                 if (name == "add") {
 132                                         string maxcnc = HandlersUtil.ExtractAttributeValue ("maxconnection", child, true);
 133                                         if (child.Attributes != null && child.Attributes.Count != 0)
 134                                                 HandlersUtil.ThrowException ("Unrecognized attribute", child);
 135
 136                                         cmd.Add (address, maxcnc);
 137                                         continue;
 138                                 }
 139
 140                                 if (name == "remove") {
 141                                         if (child.Attributes != null && child.Attributes.Count != 0)
 142                                                 HandlersUtil.ThrowException ("Unrecognized attribute", child);
 143
 144                                         cmd.Remove (address);
 145                                         continue;
 146                                 }
 147
 148                                 HandlersUtil.ThrowException ("Unexpected element", child);
 149                         }
 150 #endif
 151
 152                         return cmd;
 153                 }
 154         }
 155
 156         internal class HandlersUtil
 157         {
 158                 private HandlersUtil ()
 159                 {
 160                 }
 161 #if (XML_DEP)
 162                 static internal string ExtractAttributeValue (string attKey, XmlNode node)
 163                 {
 164                         return ExtractAttributeValue (attKey, node, false);
 165                 }
 166
 167                 static internal string ExtractAttributeValue (string attKey, XmlNode node, bool optional)
 168                 {
 169                         if (node.Attributes == null) {
 170                                 if (optional)
 171                                         return null;
 172
 173                                 ThrowException ("Required attribute not found: " + attKey, node);
 174                         }
 175
 176                         XmlNode att = node.Attributes.RemoveNamedItem (attKey);
 177                         if (att == null) {
 178                                 if (optional)
 179                                         return null;
 180                                 ThrowException ("Required attribute not found: " + attKey, node);
 181                         }
 182
 183                         string value = att.Value;
 184                         if (value == String.Empty) {
 185                                 string opt = optional ? "Optional" : "Required";
 186                                 ThrowException (opt + " attribute is empty: " + attKey, node);
 187                         }
 188
 189                         return value;
 190                 }
 191
 192                 static internal void ThrowException (string msg, XmlNode node)
 193                 {
 194                         if (node != null && node.Name != String.Empty)
 195                                 msg = msg + " (node name: " + node.Name + ") ";
 196                         throw new ConfigurationException (msg, node);
 197                 }
 198 #endif
 199         }
 200 }
 201