private static ScriptEnvironmentSetup GetSetupInformation()
{
#if FULL
ScriptEnvironmentSetup result;
// setup provided by app-domain creator:
result = ScriptEnvironmentSetup.GetAppDomainAssociated(AppDomain.CurrentDomain);
if (result != null)
{
return(result);
}
// setup provided in a configuration file:
// This will load System.Configuration.dll which costs ~350 KB of memory. However, this does not normally
// need to be loaded in simple scenarios (like running the console hosts). Hence, the working set cost
// is only paid in hosted scenarios.
ScriptConfiguration config = System.Configuration.ConfigurationManager.GetSection(ScriptConfiguration.Section) as ScriptConfiguration;
if (config != null)
{
// TODO:
//return config;
}
#endif
// default setup:
return(new ScriptEnvironmentSetup(true));
}
/// <summary>
/// Creates a new local <see cref="ScriptDomainManager"/> unless it already exists.
/// Returns either <c>true</c> and the newly created environment initialized according to the provided setup information
/// or <c>false</c> and the existing one ignoring the specified setup information.
/// </summary>
internal static bool TryCreateLocal(ScriptEnvironmentSetup setup, out ScriptDomainManager manager)
{
bool new_created = false;
if (_singleton == null)
{
if (setup == null)
{
setup = GetSetupInformation();
}
lock (_singletonLock) {
if (_singleton == null)
{
ScriptDomainManager singleton = new ScriptDomainManager(setup);
Utilities.MemoryBarrier();
_singleton = singleton;
new_created = true;
}
}
}
manager = _singleton;
return(new_created);
}
/// <summary>
/// Initializes environment according to the setup information.
/// </summary>
private ScriptDomainManager(ScriptEnvironmentSetup setup)
{
Debug.Assert(setup != null);
// create local environment for the host:
_environment = new ScriptEnvironment(this);
// create PAL (default always available):
_pal = setup.CreatePAL();
// let setup register providers listed on it:
setup.RegisterProviders(this);
// initialize snippets:
_snippets = new Snippets();
// create a local host unless a remote one has already been created:
_host = setup.CreateScriptHost(_environment);
}
