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diff --git a/OpenSim/Region/ScriptEngine/DotNetEngine/AppDomainManager.cs b/OpenSim/Region/ScriptEngine/DotNetEngine/AppDomainManager.cs
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1/*
2 * Copyright (c) Contributors, http://opensimulator.org/
3 * See CONTRIBUTORS.TXT for a full list of copyright holders.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the OpenSimulator Project nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28using System;
29using System.Collections;
30using System.Collections.Generic;
31using System.Reflection;
32using System.Security;
33using System.Security.Policy;
34using System.Security.Permissions;
35using OpenSim.Region.ScriptEngine.Interfaces;
36using OpenSim.Region.ScriptEngine.Shared.ScriptBase;
37using log4net;
38
39namespace OpenSim.Region.ScriptEngine.DotNetEngine
40{
41 public class AppDomainManager
42 {
43 //
44 // This class does AppDomain handling and loading/unloading of
45 // scripts in it. It is instanced in "ScriptEngine" and controlled
46 // from "ScriptManager"
47 //
48 // 1. Create a new AppDomain if old one is full (or doesn't exist)
49 // 2. Load scripts into AppDomain
50 // 3. Unload scripts from AppDomain (stopping them and marking
51 // them as inactive)
52 // 4. Unload AppDomain completely when all scripts in it has stopped
53 //
54
55 private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
56
57 private int maxScriptsPerAppDomain = 1;
58
59 // Internal list of all AppDomains
60 private List<AppDomainStructure> appDomains =
61 new List<AppDomainStructure>();
62
63 // Structure to keep track of data around AppDomain
64 private class AppDomainStructure
65 {
66 // The AppDomain itself
67 public AppDomain CurrentAppDomain;
68
69 // Number of scripts loaded into AppDomain
70 public int ScriptsLoaded;
71
72 // Number of dead scripts
73 public int ScriptsWaitingUnload;
74 }
75
76 // Current AppDomain
77 private AppDomainStructure currentAD;
78
79 private object getLock = new object(); // Mutex
80 private object freeLock = new object(); // Mutex
81
82 private ScriptEngine m_scriptEngine;
83 //public AppDomainManager(ScriptEngine scriptEngine)
84 public AppDomainManager(ScriptEngine scriptEngine)
85 {
86 m_scriptEngine = scriptEngine;
87 ReadConfig();
88 }
89
90 public void ReadConfig()
91 {
92 maxScriptsPerAppDomain = m_scriptEngine.ScriptConfigSource.GetInt(
93 "ScriptsPerAppDomain", 1);
94 }
95
96 // Find a free AppDomain, creating one if necessary
97 private AppDomainStructure GetFreeAppDomain()
98 {
99 lock (getLock)
100 {
101 // Current full?
102 if (currentAD != null &&
103 currentAD.ScriptsLoaded >= maxScriptsPerAppDomain)
104 {
105 // Add it to AppDomains list and empty current
106 appDomains.Add(currentAD);
107 currentAD = null;
108 }
109 // No current
110 if (currentAD == null)
111 {
112 // Create a new current AppDomain
113 currentAD = new AppDomainStructure();
114 currentAD.CurrentAppDomain = PrepareNewAppDomain();
115 }
116
117 return currentAD;
118 }
119 }
120
121 private int AppDomainNameCount;
122
123 // Create and prepare a new AppDomain for scripts
124 private AppDomain PrepareNewAppDomain()
125 {
126 // Create and prepare a new AppDomain
127 AppDomainNameCount++;
128
129 // TODO: Currently security match current appdomain
130
131 // Construct and initialize settings for a second AppDomain.
132 AppDomainSetup ads = new AppDomainSetup();
133 ads.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory;
134 ads.DisallowBindingRedirects = true;
135 ads.DisallowCodeDownload = true;
136 ads.LoaderOptimization = LoaderOptimization.MultiDomainHost;
137 ads.ShadowCopyFiles = "false"; // Disable shadowing
138 ads.ConfigurationFile =
139 AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;
140
141 AppDomain AD = AppDomain.CreateDomain("ScriptAppDomain_" +
142 AppDomainNameCount, null, ads);
143
144 m_log.Info("[" + m_scriptEngine.ScriptEngineName +
145 "]: AppDomain Loading: " +
146 AssemblyName.GetAssemblyName(
147 "OpenSim.Region.ScriptEngine.Shared.dll").ToString());
148 AD.Load(AssemblyName.GetAssemblyName(
149 "OpenSim.Region.ScriptEngine.Shared.dll"));
150
151 // Return the new AppDomain
152 return AD;
153 }
154
155 // Unload appdomains that are full and have only dead scripts
156 private void UnloadAppDomains()
157 {
158 lock (freeLock)
159 {
160 // Go through all
161 foreach (AppDomainStructure ads in new ArrayList(appDomains))
162 {
163 // Don't process current AppDomain
164 if (ads.CurrentAppDomain != currentAD.CurrentAppDomain)
165 {
166 // Not current AppDomain
167 // Is number of unloaded bigger or equal to number of loaded?
168 if (ads.ScriptsLoaded <= ads.ScriptsWaitingUnload)
169 {
170 // Remove from internal list
171 appDomains.Remove(ads);
172
173 // Unload
174 AppDomain.Unload(ads.CurrentAppDomain);
175 }
176 }
177 }
178 }
179 }
180
181 public IScript LoadScript(string FileName, out AppDomain ad)
182 {
183 // Find next available AppDomain to put it in
184 AppDomainStructure FreeAppDomain = GetFreeAppDomain();
185
186 IScript mbrt = (IScript)
187 FreeAppDomain.CurrentAppDomain.CreateInstanceFromAndUnwrap(
188 FileName, "SecondLife.Script");
189
190 FreeAppDomain.ScriptsLoaded++;
191 ad = FreeAppDomain.CurrentAppDomain;
192
193 return mbrt;
194 }
195
196
197 // Increase "dead script" counter for an AppDomain
198 public void StopScript(AppDomain ad)
199 {
200 lock (freeLock)
201 {
202 // Check if it is current AppDomain
203 if (currentAD.CurrentAppDomain == ad)
204 {
205 // Yes - increase
206 currentAD.ScriptsWaitingUnload++;
207 return;
208 }
209
210 // Lopp through all AppDomains
211 foreach (AppDomainStructure ads in new ArrayList(appDomains))
212 {
213 if (ads.CurrentAppDomain == ad)
214 {
215 // Found it
216 ads.ScriptsWaitingUnload++;
217 break;
218 }
219 }
220 }
221
222 UnloadAppDomains(); // Outsite lock, has its own GetLock
223 }
224
225 // If set to true then threads and stuff should try
226 // to make a graceful exit
227 public bool PleaseShutdown
228 {
229 get { return _PleaseShutdown; }
230 set { _PleaseShutdown = value; }
231 }
232 private bool _PleaseShutdown = false;
233 }
234}
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