/// <summary>
/// Register a downstream handler. Should start with the handler closest to the application and end with the handler which actually dispatches the message to the command handler.
/// </summary>
/// <param name="handler">The handler</param>
public void RegisterDownstream(IDownstreamHandler handler)
{
if (handler == null) throw new ArgumentNullException("handler");
var newContext = new DownstreamContext(handler);
if (_downstreamHandlers.Count > 0)
_downstreamHandlers[_downstreamHandlers.Count - 1].SetNext(newContext);
_downstreamHandlers.Add(newContext);
}
public void Destination_IsInvoked()
{
var handler = Substitute.For<IUpstreamHandler>();
var downHandler = Substitute.For<IDownstreamHandler>();
var pipeline = new Decoupled.Pipeline.Pipeline();
var context = new DownstreamContext(downHandler);
var msg = Substitute.For<IUpstreamMessage>();
pipeline.Add(context);
pipeline.Add(new UpstreamContext(handler));
pipeline.Start();
context.SendUpstream(msg);
handler.Received().HandleUpstream(Arg.Any<IUpstreamContext>(), msg);
}
public void DestinationIsNotSet()
{
var upContext = new UpstreamContext(new ForwardingUpHandler());
var destination = Substitute.For<IUpstreamHandler>();
var downHandler = Substitute.For<IDownstreamHandler>();
var downContext = new DownstreamContext(downHandler);
var pipeline = new Decoupled.Pipeline.Pipeline();
var msg = Substitute.For<IUpstreamMessage>();
pipeline.Add(downContext);
pipeline.Add(upContext);
pipeline.Add(new UpstreamContext(destination));
pipeline.Start();
upContext.Invoke(msg);
destination.Received().HandleUpstream(Arg.Any<IUpstreamContext>(), msg);
}
/// <summary>
/// Add a new downstream handler (from the invoker down to the command handler)
/// </summary>
/// <param name="context">Context for the handler</param>
public void Add(DownstreamContext context)
{
if (context == null) throw new ArgumentNullException("context");
if (_fixed)
throw new InvalidOperationException(
"The pipeline may not be modified after Start() has been called.");
if (context.IsLast)
context.SetNext(_myDownContext);
_downstream.Add(context);
}
/// <summary>
/// Initializes a new instance of the <see cref="Pipeline" /> class.
/// </summary>
public Pipeline()
{
_myUpContext = new UpstreamContext(this);
_myDownContext = new DownstreamContext(this);
}
/// <summary>
/// Sets the next handler (which this will forward messages to)
/// </summary>
/// <param name="next">The next.</param>
public void SetNext(DownstreamContext next)
{
if (next == null) throw new ArgumentNullException("next");
_next = next;
}
/// <summary>
/// Initializes a new instance of the <see cref="Pipeline" /> class.
/// </summary>
public Pipeline()
{
_myUpContext = new UpstreamContext(this);
_myDownContext = new DownstreamContext(this);
}
/// <summary>
/// Sets the downstream handler which this one will send upstream messages to
/// </summary>
/// <param name="down">Down.</param>
/// <exception cref="System.ArgumentNullException">down</exception>
public void SetDownstream(DownstreamContext down)
{
if (down == null) throw new ArgumentNullException("down");
_down = down;
}
