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diff --git a/OpenSim/Region/ScriptEngine/Common/ScriptEngineBase/AppDomainManager.cs b/OpenSim/Region/ScriptEngine/Common/ScriptEngineBase/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 OpenSim 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;
32
33namespace OpenSim.Region.ScriptEngine.Common.ScriptEngineBase
34{
35 public class AppDomainManager : iScriptEngineFunctionModule
36 {
37 //
38 // This class does AppDomain handling and loading/unloading of scripts in it.
39 // It is instanced in "ScriptEngine" and controlled from "ScriptManager"
40 //
41 // 1. Create a new AppDomain if old one is full (or doesn't exist)
42 // 2. Load scripts into AppDomain
43 // 3. Unload scripts from AppDomain (stopping them and marking them as inactive)
44 // 4. Unload AppDomain completely when all scripts in it has stopped
45 //
46
47 private int maxScriptsPerAppDomain = 1;
48
49 /// <summary>
50 /// Internal list of all AppDomains
51 /// </summary>
52 private List<AppDomainStructure> appDomains = new List<AppDomainStructure>();
53
54 /// <summary>
55 /// Structure to keep track of data around AppDomain
56 /// </summary>
57 private class AppDomainStructure
58 {
59 /// <summary>
60 /// The AppDomain itself
61 /// </summary>
62 public AppDomain CurrentAppDomain;
63
64 /// <summary>
65 /// Number of scripts loaded into AppDomain
66 /// </summary>
67 public int ScriptsLoaded;
68
69 /// <summary>
70 /// Number of dead scripts
71 /// </summary>
72 public int ScriptsWaitingUnload;
73 }
74
75 /// <summary>
76 /// Current AppDomain
77 /// </summary>
78 private AppDomainStructure currentAD;
79
80 private object getLock = new object(); // Mutex
81 private object freeLock = new object(); // Mutex
82
83 private ScriptEngine m_scriptEngine;
84 //public AppDomainManager(ScriptEngine scriptEngine)
85 public AppDomainManager(ScriptEngine scriptEngine)
86 {
87 m_scriptEngine = scriptEngine;
88 ReadConfig();
89 }
90
91 public void ReadConfig()
92 {
93 maxScriptsPerAppDomain = m_scriptEngine.ScriptConfigSource.GetInt("ScriptsPerAppDomain", 1);
94 }
95
96 /// <summary>
97 /// Find a free AppDomain, creating one if necessary
98 /// </summary>
99 /// <returns>Free AppDomain</returns>
100 private AppDomainStructure GetFreeAppDomain()
101 {
102 // Console.WriteLine("Finding free AppDomain");
103 lock (getLock)
104 {
105 // Current full?
106 if (currentAD != null && currentAD.ScriptsLoaded >= maxScriptsPerAppDomain)
107 {
108 // Add it to AppDomains list and empty current
109 appDomains.Add(currentAD);
110 currentAD = null;
111 }
112 // No current
113 if (currentAD == null)
114 {
115 // Create a new current AppDomain
116 currentAD = new AppDomainStructure();
117 currentAD.CurrentAppDomain = PrepareNewAppDomain();
118 }
119
120 // Console.WriteLine("Scripts loaded in this Appdomain: " + currentAD.ScriptsLoaded);
121 return currentAD;
122 }
123 }
124
125 private int AppDomainNameCount;
126
127 /// <summary>
128 /// Create and prepare a new AppDomain for scripts
129 /// </summary>
130 /// <returns>The new AppDomain</returns>
131 private AppDomain PrepareNewAppDomain()
132 {
133 // Create and prepare a new AppDomain
134 AppDomainNameCount++;
135 // TODO: Currently security match current appdomain
136
137 // Construct and initialize settings for a second AppDomain.
138 AppDomainSetup ads = new AppDomainSetup();
139 ads.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory;
140 ads.DisallowBindingRedirects = true;
141 ads.DisallowCodeDownload = true;
142 ads.LoaderOptimization = LoaderOptimization.MultiDomainHost;
143 ads.ShadowCopyFiles = "false"; // Disable shadowing
144 ads.ConfigurationFile = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;
145
146
147 AppDomain AD = AppDomain.CreateDomain("ScriptAppDomain_" + AppDomainNameCount, null, ads);
148 m_scriptEngine.Log.Info("[" + m_scriptEngine.ScriptEngineName + "]: AppDomain Loading: " +
149 AssemblyName.GetAssemblyName("OpenSim.Region.ScriptEngine.Common.dll").ToString());
150 AD.Load(AssemblyName.GetAssemblyName("OpenSim.Region.ScriptEngine.Common.dll"));
151
152 // Return the new AppDomain
153 return AD;
154 }
155
156 /// <summary>
157 /// Unload appdomains that are full and have only dead scripts
158 /// </summary>
159 private void UnloadAppDomains()
160 {
161 lock (freeLock)
162 {
163 // Go through all
164 foreach (AppDomainStructure ads in new ArrayList(appDomains))
165 {
166 // Don't process current AppDomain
167 if (ads.CurrentAppDomain != currentAD.CurrentAppDomain)
168 {
169 // Not current AppDomain
170 // Is number of unloaded bigger or equal to number of loaded?
171 if (ads.ScriptsLoaded <= ads.ScriptsWaitingUnload)
172 {
173 // Remove from internal list
174 appDomains.Remove(ads);
175//#if DEBUG
176 //Console.WriteLine("Found empty AppDomain, unloading");
177 //long m = GC.GetTotalMemory(true); // This force a garbage collect that freezes some windows plateforms
178//#endif
179 // Unload
180 AppDomain.Unload(ads.CurrentAppDomain);
181//#if DEBUG
182 //m_scriptEngine.Log.Info("[" + m_scriptEngine.ScriptEngineName + "]: AppDomain unload freed " + (m - GC.GetTotalMemory(true)) + " bytes of memory");
183//#endif
184 }
185 }
186 }
187 }
188 }
189
190 public IScript LoadScript(string FileName)
191 {
192 // Find next available AppDomain to put it in
193 AppDomainStructure FreeAppDomain = GetFreeAppDomain();
194
195#if DEBUG
196 m_scriptEngine.Log.Info("[" + m_scriptEngine.ScriptEngineName + "]: Loading into AppDomain: " + FileName);
197#endif
198 IScript mbrt =
199 (IScript)
200 FreeAppDomain.CurrentAppDomain.CreateInstanceFromAndUnwrap(FileName, "SecondLife.Script");
201 //Console.WriteLine("ScriptEngine AppDomainManager: is proxy={0}", RemotingServices.IsTransparentProxy(mbrt));
202 FreeAppDomain.ScriptsLoaded++;
203
204 return mbrt;
205 }
206
207
208 /// <summary>
209 /// Increase "dead script" counter for an AppDomain
210 /// </summary>
211 /// <param name="ad"></param>
212 //[Obsolete("Needs fixing, needs a real purpose in life!!!")]
213 public void StopScript(AppDomain ad)
214 {
215 lock (freeLock)
216 {
217#if DEBUG
218 m_scriptEngine.Log.Info("[" + m_scriptEngine.ScriptEngineName + "]: Stopping script in AppDomain");
219#endif
220 // Check if it is current AppDomain
221 if (currentAD.CurrentAppDomain == ad)
222 {
223 // Yes - increase
224 currentAD.ScriptsWaitingUnload++;
225 return;
226 }
227
228 // Lopp through all AppDomains
229 foreach (AppDomainStructure ads in new ArrayList(appDomains))
230 {
231 if (ads.CurrentAppDomain == ad)
232 {
233 // Found it
234 ads.ScriptsWaitingUnload++;
235 break;
236 }
237 }
238 }
239
240 UnloadAppDomains(); // Outsite lock, has its own GetLock
241 }
242
243 /// <summary>
244 /// If set to true then threads and stuff should try to make a graceful exit
245 /// </summary>
246 public bool PleaseShutdown
247 {
248 get { return _PleaseShutdown; }
249 set { _PleaseShutdown = value; }
250 }
251 private bool _PleaseShutdown = false;
252 }
253}
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