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using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Threading;
using System.Runtime.Remoting;
using System.IO;
using OpenSim.Region.Environment.Scenes;
using OpenSim.Region.Environment.Scenes.Scripting;
using OpenSim.Region.ScriptEngine.DotNetEngine.Compiler.LSL;
using OpenSim.Region.ScriptEngine.Common;
using libsecondlife;
namespace OpenSim.Region.ScriptEngine.DotNetEngine
{
public class AppDomainManager
{
private int maxScriptsPerAppDomain = 1;
/// <summary>
/// Internal list of all AppDomains
/// </summary>
private List<AppDomainStructure> appDomains = new List<AppDomainStructure>();
/// <summary>
/// Structure to keep track of data around AppDomain
/// </summary>
private class AppDomainStructure
{
/// <summary>
/// The AppDomain itself
/// </summary>
public AppDomain CurrentAppDomain;
/// <summary>
/// Number of scripts loaded into AppDomain
/// </summary>
public int ScriptsLoaded;
/// <summary>
/// Number of dead scripts
/// </summary>
public int ScriptsWaitingUnload;
}
/// <summary>
/// Current AppDomain
/// </summary>
private AppDomainStructure currentAD;
private object getLock = new object(); // Mutex
private object freeLock = new object(); // Mutex
//private ScriptEngine m_scriptEngine;
//public AppDomainManager(ScriptEngine scriptEngine)
public AppDomainManager()
{
//m_scriptEngine = scriptEngine;
}
/// <summary>
/// Find a free AppDomain, creating one if necessary
/// </summary>
/// <returns>Free AppDomain</returns>
private AppDomainStructure GetFreeAppDomain()
{
Console.WriteLine("Finding free AppDomain");
lock (getLock)
{
// Current full?
if (currentAD != null && currentAD.ScriptsLoaded >= maxScriptsPerAppDomain)
{
// Add it to AppDomains list and empty current
appDomains.Add(currentAD);
currentAD = null;
}
// No current
if (currentAD == null)
{
// Create a new current AppDomain
currentAD = new AppDomainStructure();
currentAD.CurrentAppDomain = PrepareNewAppDomain();
}
Console.WriteLine("Scripts loaded in this Appdomain: " + currentAD.ScriptsLoaded);
return currentAD;
} // lock
}
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
AppDomainNameCount++;
// TODO: Currently security match current appdomain
// Construct and initialize settings for a second AppDomain.
AppDomainSetup ads = new AppDomainSetup();
ads.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory;
ads.DisallowBindingRedirects = false;
ads.DisallowCodeDownload = true;
ads.ShadowCopyFiles = "true"; // Enabled shadowing
ads.ConfigurationFile = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;
AppDomain AD = AppDomain.CreateDomain("ScriptAppDomain_" + AppDomainNameCount, null, ads);
// Return the new AppDomain
return AD;
}
/// <summary>
/// Unload appdomains that are full and have only dead scripts
/// </summary>
private void UnloadAppDomains()
{
lock (freeLock)
{
// Go through all
foreach (AppDomainStructure ads in new System.Collections.ArrayList(appDomains))
{
// Don't process current AppDomain
if (ads.CurrentAppDomain != currentAD.CurrentAppDomain)
{
// Not current AppDomain
// Is number of unloaded bigger or equal to number of loaded?
if (ads.ScriptsLoaded <= ads.ScriptsWaitingUnload)
{
Console.WriteLine("Found empty AppDomain, unloading");
// Remove from internal list
appDomains.Remove(ads);
#if DEBUG
long m = GC.GetTotalMemory(true);
#endif
// Unload
AppDomain.Unload(ads.CurrentAppDomain);
#if DEBUG
Console.WriteLine("AppDomain unload freed " + (m - GC.GetTotalMemory(true)) + " bytes of memory");
#endif
}
}
} // foreach
} // lock
}
public OpenSim.Region.ScriptEngine.DotNetEngine.Compiler.LSL.LSL_BaseClass LoadScript(string FileName)
{
// Find next available AppDomain to put it in
AppDomainStructure FreeAppDomain = GetFreeAppDomain();
Console.WriteLine("Loading into AppDomain: " + FileName);
LSL_BaseClass mbrt = (LSL_BaseClass)FreeAppDomain.CurrentAppDomain.CreateInstanceFromAndUnwrap(FileName, "SecondLife.Script");
//Console.WriteLine("ScriptEngine AppDomainManager: is proxy={0}", RemotingServices.IsTransparentProxy(mbrt));
FreeAppDomain.ScriptsLoaded++;
return mbrt;
}
/// <summary>
/// Increase "dead script" counter for an AppDomain
/// </summary>
/// <param name="ad"></param>
//[Obsolete("Needs fixing, needs a real purpose in life!!!")]
public void StopScript(AppDomain ad)
{
lock (freeLock)
{
Console.WriteLine("Stopping script in AppDomain");
// Check if it is current AppDomain
if (currentAD.CurrentAppDomain == ad)
{
// Yes - increase
currentAD.ScriptsWaitingUnload++;
return;
}
// Lopp through all AppDomains
foreach (AppDomainStructure ads in new System.Collections.ArrayList(appDomains))
{
if (ads.CurrentAppDomain == ad)
{
// Found it
ads.ScriptsWaitingUnload++;
break;
}
} // foreach
} // lock
UnloadAppDomains(); // Outsite lock, has its own GetLock
}
}
}
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