From 1ae73931da62409a36b9c448ac35537dfe3745eb Mon Sep 17 00:00:00 2001
From: Tedd Hansen
Date: Sat, 18 Aug 2007 22:33:06 +0000
Subject: Added (theoretical) AppDomain cleanup code.

---
 .../ScriptEngine/DotNetEngine/AppDomainManager.cs  | 106 +++++++++++++++++----
 1 file changed, 89 insertions(+), 17 deletions(-)

(limited to 'OpenSim')

diff --git a/OpenSim/Region/ScriptEngine/DotNetEngine/AppDomainManager.cs b/OpenSim/Region/ScriptEngine/DotNetEngine/AppDomainManager.cs
index 7941ea2..f80ebac 100644
--- a/OpenSim/Region/ScriptEngine/DotNetEngine/AppDomainManager.cs
+++ b/OpenSim/Region/ScriptEngine/DotNetEngine/AppDomainManager.cs
@@ -10,7 +10,10 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine
 {
     public class AppDomainManager
     {
-        private int MaxScriptsPerAppDomain = 10;
+        private int MaxScriptsPerAppDomain = 1;
+        /// <summary>
+        /// List of all AppDomains
+        /// </summary>
         private List<AppDomainStructure> AppDomains = new List<AppDomainStructure>();
         private struct AppDomainStructure
         {
@@ -27,8 +30,12 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine
             /// </summary>
             public int ScriptsWaitingUnload;
         }
+        /// <summary>
+        /// Current AppDomain
+        /// </summary>
         private AppDomainStructure CurrentAD;
-        private object GetLock = new object();
+        private object GetLock = new object(); // Mutex
+        private object FreeLock = new object(); // Mutex
 
                 private ScriptEngine m_scriptEngine;
         public AppDomainManager(ScriptEngine scriptEngine)
@@ -36,17 +43,28 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine
             m_scriptEngine = scriptEngine;
         }
 
+        /// <summary>
+        /// Find a free AppDomain, creating one if necessary
+        /// </summary>
+        /// <returns>Free AppDomain</returns>
         internal AppDomain GetFreeAppDomain()
         {
+            FreeAppDomains();
             lock(GetLock) {
-                // No current or current full?
-                if (CurrentAD.CurrentAppDomain == null || CurrentAD.ScriptsLoaded >= MaxScriptsPerAppDomain)
+                // Current full?
+                if (CurrentAD.ScriptsLoaded >= MaxScriptsPerAppDomain)
+                {
+                    AppDomains.Add(CurrentAD);
+                    CurrentAD = new AppDomainStructure();   
+                }
+                // No current
+                if (CurrentAD.CurrentAppDomain == null)
                 {
                     // Create a new current AppDomain
                     CurrentAD = new AppDomainStructure();
                     CurrentAD.ScriptsWaitingUnload = 0; // to avoid compile warning for not in use
                     CurrentAD.CurrentAppDomain = PrepareNewAppDomain();
-                    AppDomains.Add(CurrentAD);
+                    
 
                 }
 
@@ -58,6 +76,10 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine
         }
 
         private int AppDomainNameCount;
+        /// <summary>
+        /// Create and prepare a new AppDomain for scripts
+        /// </summary>
+        /// <returns>The new AppDomain</returns>
         private AppDomain PrepareNewAppDomain()
         {
             // Create and prepare a new AppDomain
@@ -80,20 +102,20 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine
                 AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;
 
             AppDomain AD = AppDomain.CreateDomain("ScriptAppDomain_" + AppDomainNameCount, null, ads);
-            foreach (Assembly a in AppDomain.CurrentDomain.GetAssemblies())
-            {
-                //Console.WriteLine("Loading: " + a.GetName(true));
-                try
-                {
-                    //AD.Load(a.GetName(true));
+            //foreach (Assembly a in AppDomain.CurrentDomain.GetAssemblies())
+            //{
+            //    //Console.WriteLine("Loading: " + a.GetName(true));
+            //    try
+            //    {
+            //        //AD.Load(a.GetName(true));
                     
-                }
-                catch (Exception e)
-                {
-                    //Console.WriteLine("FAILED load");
-                }
+            //    }
+            //    catch (Exception e)
+            //    {
+            //        //Console.WriteLine("FAILED load");
+            //    }
                 
-            }
+            //}
 
             //Console.WriteLine("Assembly file: " + this.GetType().Assembly.CodeBase);
             //Console.WriteLine("Assembly name: " + this.GetType().ToString());
@@ -106,5 +128,55 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine
 
         }
 
+        /// <summary>
+        /// Unload appdomains that are full and have only dead scripts
+        /// </summary>
+        private void FreeAppDomains()
+        {
+            lock (FreeLock)
+            {
+                foreach (AppDomainStructure ads in new System.Collections.ArrayList(AppDomains))
+                {
+                    if (ads.CurrentAppDomain != CurrentAD.CurrentAppDomain)
+                    {
+                        // Not current AppDomain
+                        if (ads.ScriptsLoaded == ads.ScriptsWaitingUnload)
+                        {
+                            AppDomains.Remove(ads);
+                            AppDomain.Unload(ads.CurrentAppDomain);
+                        }
+                    }
+                } // foreach
+            } // lock
+        }
+
+        /// <summary>
+        /// Increase "dead script" counter for an AppDomain
+        /// </summary>
+        /// <param name="ad"></param>
+        [Obsolete("Needs optimizing!!!")]
+        public void StopScriptInAppDomain(AppDomain ad)
+        {
+            lock (FreeLock)
+            {
+                if (CurrentAD.CurrentAppDomain == ad)
+                {
+                    CurrentAD.ScriptsWaitingUnload++;
+                    return;
+                }
+
+                foreach (AppDomainStructure ads in new System.Collections.ArrayList(AppDomains))
+                {
+                    if (ads.CurrentAppDomain == ad)
+                    {
+                        AppDomainStructure ads2 = ads;
+                        ads2.ScriptsWaitingUnload++;
+                        AppDomains.Remove(ads);
+                        AppDomains.Add(ads2);
+                        return;
+                    }
+                } // foreach
+            } // lock
+        }
     }
 }
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