1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSim Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
using System;
using System.Collections.Generic;
using libsecondlife;
using OpenSim.Framework;
using OpenSim.Framework.Console;
using OpenSim.Region.Environment.Scenes;
namespace OpenSim.Region.Environment.Modules
{
/// <summary>
/// This module sets up texture senders in response to client texture requests, and places them on a
/// processing queue once those senders have the appropriate data (i.e. a texture retrieved from the
/// asset cache).
/// </summary>
public class UserTextureDownloadService
{
//private static readonly log4net.ILog m_log
// = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
/// <summary>
/// Holds texture senders before they have received the appropriate texture from the asset cache.
/// </summary>
private readonly Dictionary<LLUUID, TextureSender> m_textureSenders = new Dictionary<LLUUID, TextureSender>();
/// <summary>
/// Texture Senders are placed in this queue once they have received their texture from the asset
/// cache. Another module actually invokes the send.
/// </summary>
private readonly BlockingQueue<TextureSender> m_sharedSendersQueue;
private readonly Scene m_scene;
public UserTextureDownloadService(Scene scene, BlockingQueue<TextureSender> sharedQueue)
{
m_scene = scene;
m_sharedSendersQueue = sharedQueue;
}
/// <summary>
/// Handle a texture request. This involves creating a texture sender and placing it on the
/// previously passed in shared queue.
/// </summary>
/// <param name="client"> </param>
/// <param name="e"></param>
public void HandleTextureRequest(IClientAPI client, TextureRequestArgs e)
{
TextureSender textureSender;
//TODO: should be working out the data size/ number of packets to be sent for each discard level
if ((e.DiscardLevel >= 0) || (e.Priority != 0))
{
lock (m_textureSenders)
{
if (m_textureSenders.TryGetValue(e.RequestedAssetID, out textureSender))
{
// If we've received new non UUID information for this request and it hasn't dispatched
// yet, then update the request accordingly.
textureSender.UpdateRequest(e.DiscardLevel, e.PacketNumber);
}
else
{
//m_log.DebugFormat("[USER TEXTURE DOWNLOAD]: Adding download stat {0}", e.RequestedAssetID);
m_scene.AddPendingDownloads(1);
TextureSender requestHandler =
new TextureSender(client, e.DiscardLevel, e.PacketNumber);
m_textureSenders.Add(e.RequestedAssetID, requestHandler);
m_scene.AssetCache.GetAsset(e.RequestedAssetID, TextureCallback, true);
}
}
}
else
{
lock (m_textureSenders)
{
if (m_textureSenders.TryGetValue(e.RequestedAssetID, out textureSender))
{
textureSender.Cancel = true;
}
}
}
}
/// <summary>
/// The callback for the asset cache when a texture has been retrieved. This method queues the
/// texture sender for processing.
/// </summary>
/// <param name="textureID"></param>
/// <param name="asset"></param>
public void TextureCallback(LLUUID textureID, AssetBase texture)
{
lock (m_textureSenders)
{
TextureSender textureSender;
if (m_textureSenders.TryGetValue(textureID, out textureSender))
{
if (null != texture)
{
if (!textureSender.ImageLoaded)
{
textureSender.TextureReceived(texture);
EnqueueTextureSender(textureSender);
}
}
else
{
// Right now, leaving it up to lower level asset server code to post the fact that
// this texture could not be found
// TODO Send packet back to the client telling it not to expect the texture
// The absence of this packet doesn't appear to be causing it a problem right now
//m_log.DebugFormat("[USER TEXTURE DOWNLOAD]: Removing download stat for {0}", textureID);
m_scene.AddPendingDownloads(-1);
}
//m_log.InfoFormat("[TEXTURE SENDER] Removing texture sender with uuid {0}", textureID);
m_textureSenders.Remove(textureID);
//m_log.InfoFormat("[TEXTURE SENDER] Current texture senders in dictionary: {0}", m_textureSenders.Count);
}
else
{
throw new Exception("Got a texture with no sender object to handle it, this shouldn't happen");
}
}
}
/// <summary>
/// Place a ready texture sender on the processing queue.
/// </summary>
/// <param name="textureSender"></param>
private void EnqueueTextureSender(TextureSender textureSender)
{
textureSender.Cancel = false;
textureSender.Sending = true;
textureSender.counter = 0;
if (!m_sharedSendersQueue.Contains(textureSender))
{
m_sharedSendersQueue.Enqueue(textureSender);
}
}
/// <summary>
/// Close this module.
/// </summary>
internal void Close()
{
lock (m_textureSenders)
{
foreach( TextureSender textureSender in m_textureSenders.Values )
{
textureSender.Cancel = true;
}
m_textureSenders.Clear();
}
}
}
}
|
