static IEnumerable <DataLoaderPlugin <T> > CreateDataLoaders <T>(Assembly assembly)
{
int count = 0;
foreach (Type type in assembly.GetTypes())
{
if (typeof(DataLoaderPlugin <>).IsAssignableFromGeneric(type))
{
Type[] typeArgs = { typeof(T) };
Type constructed = type.MakeGenericType(typeArgs);
DataLoaderPlugin <T> result = Activator.CreateInstance(constructed) as DataLoaderPlugin <T>;
if (result != null)
{
count++;
yield return(result);
}
}
}
if (count == 0)
{
string availableTypes = string.Join(",", assembly.GetTypes().Select(t => t.FullName));
throw new ApplicationException(
$"Can't find any type which implements DataLoaderPlugin<T> in {assembly} from {assembly.Location}.\n" +
$"Available types: {availableTypes}");
}
}
static void Main(string[] args)
{
try
{
if (args.Length == 1 && args[0] == "/d")
{
Console.WriteLine("Waiting for any key...");
Console.ReadLine();
}
string[] pluginPaths = new string[]
{
@"plugins\JsonLoader\bin\Debug\netcoreapp3.1\JsonLoader.dll",
@"plugins\CsvLoader\bin\Debug\netcoreapp3.1\CsvLoader.dll",
};
IEnumerable <DataLoaderPlugin <User> > userLoaders = pluginPaths.SelectMany(pluginPath =>
{
Assembly pluginAssembly = LoadPlugin(pluginPath);
return(CreateDataLoaders <User>(pluginAssembly));
}).ToList();
try
{
string selectedLoader = args[0];
Console.WriteLine($"-- {selectedLoader} --");
DataLoaderPlugin <User> loader = userLoaders.FirstOrDefault(l => l.Name == selectedLoader);
if (loader == null)
{
Console.WriteLine("No such loader is known.");
return;
}
string dataDir = Path.GetFullPath(Path.Combine(GetRootDirectory(), args[1].Replace('\\', Path.DirectorySeparatorChar)));
List <User> users = loader.LoadData(dataDir).ToList();
showSample <User>(users, 10);
Console.WriteLine("Total number of users: " + users.Count);
}
catch (Exception e)
{
Console.WriteLine(e);
Console.WriteLine("Loaders: ");
foreach (DataLoaderPlugin <User> loader in userLoaders)
{
Console.WriteLine($"{loader.Name.ToUpper()}\t - {loader.Description}\t - Usage: {loader.Name} [DATADIR]");
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}