mcs/class/System.ServiceModel/System.ServiceModel.Channels/BufferManager.cs

   1 //
   2 // BufferManager.cs
   3 //
   4 // Author: Atsushi Enomoto (atsushi@ximian.com)
   5 //
   6 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining
   9 // a copy of this software and associated documentation files (the
  10 // "Software"), to deal in the Software without restriction, including
  11 // without limitation the rights to use, copy, modify, merge, publish,
  12 // distribute, sublicense, and/or sell copies of the Software, and to
  13 // permit persons to whom the Software is furnished to do so, subject to
  14 // the following conditions:
  15 //
  16 // The above copyright notice and this permission notice shall be
  17 // included in all copies or substantial portions of the Software.
  18 //
  19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  20 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  22 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  23 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  24 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  25 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26 //
  27 using System;
  28 using System.IO;
  29 using System.Collections.ObjectModel;
  30 using System.ServiceModel;
  31
  32 namespace System.ServiceModel.Channels
  33 {
  34         public abstract class BufferManager
  35         {
  36                 protected BufferManager ()
  37                 {
  38                 }
  39
  40                 public abstract void Clear ();
  41
  42                 [MonoTODO]
  43                 public static BufferManager CreateBufferManager (
  44                         long maxBufferPoolSize, int maxBufferSize)
  45                 {
  46                         return new DefaultBufferManager (maxBufferPoolSize,
  47                                 maxBufferSize);
  48                 }
  49
  50                 public abstract void ReturnBuffer (byte[] buffer);
  51
  52                 public abstract byte[] TakeBuffer (int bufferSize);
  53
  54                 class DefaultBufferManager : BufferManager
  55                 {
  56                         long max_pool_size;
  57                         int max_size;
  58                         byte [] buffer;
  59
  60                         public DefaultBufferManager (long maxBufferPoolSize,
  61                                 int maxBufferSize)
  62                         {
  63                                 this.max_pool_size = maxBufferPoolSize;
  64                                 this.max_size = maxBufferSize;
  65                         }
  66
  67                         public override void Clear ()
  68                         {
  69                                 if (buffer != null)
  70                                         Array.Clear (buffer, 0, buffer.Length);
  71                         }
  72
  73                         public override void ReturnBuffer (byte [] buffer)
  74                         {
  75                                 // is this correct?
  76
  77                                 if (this.buffer == null)
  78                                         return;
  79                                 Array.Copy (this.buffer, buffer, this.buffer.Length);
  80                         }
  81
  82                         public override byte [] TakeBuffer (int bufferSize)
  83                         {
  84                                 if (bufferSize > max_size)
  85                                         throw new ArgumentOutOfRangeException ();
  86
  87                                 if (buffer == null || buffer.Length < bufferSize)
  88                                         buffer = new byte [bufferSize];
  89                                 return buffer;
  90                         }
  91                 }
  92         }
  93 }