private PluginInfo[] LoadPlugins()
{
var pluginFolder = GetPluginFolder();
var pluginFolderSettingsName = $"{nameof(Plugin)}:{nameof(Plugin.Folder)}";
if (string.IsNullOrWhiteSpace(pluginFolder))
{
_logger.Info($"'{pluginFolderSettingsName}' setting not configured. No plugins will be loaded.");
return(new PluginInfo[0]);
}
if (!Directory.Exists(pluginFolder))
{
_logger.Warn($"Plugin folder '{pluginFolder}' does not exist. No plugins will be loaded.");
_logger.Warn(
$"To configure plugins update the '{pluginFolderSettingsName}' setting with either an absolute path, a path relative to the 'Ed-Fi-ODS-Implementation\\Application\\EdFi.Ods.WebApi\', or a path relative to the deployed EdFi.Ods.WebApi executable.");
return(new PluginInfo[0]);
}
try
{
_logger.Info($"Loading plugins from: '{pluginFolder}'");
var assemblyFiles = AssemblyLoaderHelper.FindPluginAssemblies(pluginFolder);
// IMPORTANT: Load the plug-in assembly into the Default context
return(assemblyFiles
.Select(
assemblyFile => new PluginInfo
{
AssemblyFileName = assemblyFile,
Assembly = AssemblyLoadContext.Default.LoadFromAssemblyPath(assemblyFile)
})
.ToArray());
}
finally
{
// LoadPluginAssemblies method creates a pluginFinderAssemblyContext and loads assembles in it to
// determine plugins to load in the app domain. Need to force a garbage collection to unload
// the pluginFinderAssemblyContext immediately or else assemblies loaded in this context will
// be in the current app domain.
GC.Collect();
}
}