private static void _LoadGraphEngineExtensions()
{
// Sometimes even if the assembly is tagged with the import extension attribute,
// the extension assembly still won't get loaded. To alleviate this, we acquire
// all currently loaded assemblies (including the one that calls into Trinity.Core and references the extension),
// and forcibly enumerate its custom attributes. When the import extension
// attribute is enumerated, it will trigger CLR to load its assembly, and thus
// AppDomain.CurrentDomain.GetAssemblies will contain the extension assembly.
Log.WriteLine(LogLevel.Info, "Loading Graph Engine Extensions.");
AssemblyUtility.LoadReferences();
AssemblyUtility.ForAllAssemblies(_ => _.GetCustomAttributes().ToList());
}
/// <returns>E_SUCCESS or E_FAILURE</returns>
private static TrinityErrorCode _ScanForTSLStorageExtension()
{
Log.WriteLine(LogLevel.Info, "Scanning for TSL storage extension.");
var loaded_tuple = AssemblyUtility
.ForAllAssemblies(_LoadTSLStorageExtension)
.Where(_ => _.Item1 != null && _.Item2 != null)
.OrderByDescending(_ => _.Item3)
.FirstOrDefault();
if (loaded_tuple == default(Tuple <IGenericCellOperations, IStorageSchema, int>))
{
Log.WriteLine(LogLevel.Info, "No TSL storage extension loaded.");
_RegisterTSLStorageExtension(new DefaultGenericCellOperations(), new DefaultStorageSchema());
return(TrinityErrorCode.E_FAILURE);
}
else
{
Log.WriteLine(LogLevel.Info, "TSL storage extension loaded.");
_RegisterTSLStorageExtension(loaded_tuple.Item1, loaded_tuple.Item2);
return(TrinityErrorCode.E_SUCCESS);
}
}