public bool IsAuthenticationRequired(ICommandBase command)
{
if (commandTypePermissions.Value.TryGetValue(command.GetType(), out var info))
{
return(info.IsAuthenticationRequired);
}
throw new ArgumentException(
$"Unknown command type passed to IsAuthenticationRequired: {command.GetType().FullName}");
}
public IReadOnlyCollection <Permission> GetCommandPermissions(ICommandBase command)
{
if (commandTypePermissions.Value.TryGetValue(command.GetType(), out var permissions))
{
return(permissions);
}
throw new ArgumentException(
$"Unknown command type to GetCommandPermissions for: {command.GetType().FullName}");
}
public Task SendAsync(ICommandBase command, CancellationToken cancellationToken)
{
Type genericCommandType = command.GetType().GetInterfaces().FirstOrDefault(
x => x.IsConstructedGenericType && x.GetGenericTypeDefinition() == typeof(ICommand <>));
Type handlerType;
if (genericCommandType != null)
{
handlerType = typeof(ICommandHandler <,>).MakeGenericType(command.GetType(),
genericCommandType.GetGenericArguments()[0]);
return(InvokeHandleAsync(handlerType, command, cancellationToken));
}
handlerType = typeof(ICommandHandler <>).MakeGenericType(command.GetType());
return(InvokeHandleAsync(handlerType, command, cancellationToken));
}
public Task SendAsync(ICommandBase command, CommandExecutionOptions executionOptions,
CancellationToken cancellationToken = default(CancellationToken))
{
var commandBus = commandRouter.FindRoute(command.GetType())
?? throw new ArgumentException($"No route to a command bus found for command type {command.GetType()}");
return(commandBus.SendAsync(command, executionOptions, cancellationToken));
}
private Task InvokeHandleAsync(Type handlerType, ICommandBase command, CancellationToken cancellationToken)
{
Type commandType = command.GetType();
object listener = serviceLocator.Get(handlerType);
var handleMethod = listener.GetType()
.GetRuntimeMethod(nameof(ICommandHandler <ICommand> .HandleAsync), new[] { commandType, typeof(CancellationToken) });
return((Task)handleMethod.Invoke(listener, new object[] { command, cancellationToken }));
// TODO test with contravariant handlers
}
public Task <object> ProcessAsync(ICommandBase command, CommandBusMiddlewareDelegate executionHandler,
ICommandBus commandBus, CommandExecutionOptions executionOptions, CancellationToken cancellationToken)
{
var processMethod = GetType().GetRuntimeMethods().Single(x => x.Name == "ProcessInternalAsync");
var boundProcessMethod = processMethod.MakeGenericMethod(command.GetType());
return((Task <object>)boundProcessMethod.Invoke(this, new object[]
{
command, executionHandler, commandBus, executionOptions, cancellationToken
}));
}
private async Task <TResult> InvokeHandleAsync <TResult>(Type handlerType, ICommandBase command, CommandExecutionOptions executionOptions,
CancellationToken cancellationToken)
{
CommandBusMiddlewareDelegate executionHandler = async processedCommand =>
{
if (processedCommand == null)
{
throw new ArgumentNullException(nameof(processedCommand));
}
if (!command.GetType().IsInstanceOfType(processedCommand))
{
throw new ArgumentException(
$"Command passed back to command bus from a middleware is not of its original type {command.GetType()}");
}
Type commandType = command.GetType();
object listener = serviceLocator.Get(handlerType);
var handleMethod = listener.GetType()
.GetRuntimeMethod(nameof(ICommandHandler <ICommand> .HandleAsync),
new[] { commandType, typeof(CancellationToken) });
var resultTask = (Task)handleMethod.Invoke(listener, new object[] { command, cancellationToken });
if (resultTask is Task <TResult> resultObjectTask)
{
return(await resultObjectTask);
}
else
{
await resultTask;
return(null);
}
};
object result = await pipeline.ProcessAsync(command, executionHandler, this,
executionOptions, cancellationToken);
return((TResult)result);
// TODO test with contravariant handlers
}
/*
* Return.
*/
public void ReturnCommand(ICommandBase command)
{
if (command == null)
{
return;
}
var commandType = command.GetType();
var usedInstances = GetCommandUsedInstances(commandType, false);
if (usedInstances == null || !usedInstances.Remove(command))
{
return;
}
GetCommandAvailableInstances(commandType, false).Push(command);
}
private CommandLog(ICommandBase command, Exception exception, bool operationSuccess)
: base(exception, operationSuccess)
{
this.SerializedCommand = command.ToSerialize();
this.CommandType = command.GetType().Name;
}