//-----------------------------------------------------------------------------------------------
// private methods
//-----------------------------------------------------------------------------------------------
/// <summary>
/// Written by Abhishek Kumar on March 05, 2007
/// purpose: to initiate the central Application Domain that
/// all Grid Threads will be run on.
///
/// Police and permissions will also be set.
/// ADV: a crash in this App Domain(because of poor code in GThread)
/// does not affect eduGRID's Framework i.e. the Alchemi executor is maintained steady even in error
///
/// initially Alchemi created separate app domains for each Gthread it received.
/// now, instead, we create 1 appdomain and run all gthreads on it
/// the Bot Logic resides in this app domain.
/// (this saves the overhead of initializing bot logic for every Gthread (or every query))
/// </summary>
private void initialize_GridThreadExecutor()
{
if (GridThreadExecutor == null)
{
string appDir = GetApplicationDirectory(_CurTi.ApplicationId);
AppDomainSetup info = new AppDomainSetup();
info.PrivateBinPath = appDir;
GridThreadApplicationDomain = AppDomain.CreateDomain("Central_AppDomain", null, info);
// ***
// http://www.dotnetthis.com/Articles/DynamicSandboxing.htm
PolicyLevel domainPolicy = PolicyLevel.CreateAppDomainLevel();
AllMembershipCondition allCodeMC = new AllMembershipCondition();
// TODO: 'FullTrust' in the following line needs to be replaced with something like 'AlchemiGridThread'
// This permission set needs to be defined and set automatically as part of the installation.
PermissionSet internetPermissionSet = domainPolicy.GetNamedPermissionSet("FullTrust");
PolicyStatement internetPolicyStatement = new PolicyStatement(internetPermissionSet);
CodeGroup allCodeInternetCG = new UnionCodeGroup(allCodeMC, internetPolicyStatement);
domainPolicy.RootCodeGroup = allCodeInternetCG;
GridThreadApplicationDomain.SetAppDomainPolicy(domainPolicy);
GridThreadExecutor = (AppDomainExecutor)GridThreadApplicationDomain.CreateInstanceFromAndUnwrap(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Alchemi.Executor.dll"), "Alchemi.Executor.AppDomainExecutor");
}
if (!GridThreadExecutor.Initialized)
{
try
{
GridThreadExecutor.initialize();
}
catch (Exception ex)
{
throw new Exception("Error during initialization of GridThreadExecutor");
}
}
}
