private static void Main(string[] args)
{
var routingSlip = new RoutingSlip(new WorkItem[]
{
new WorkItem <ReserveCarActivity>(new WorkItemArguments {
{ "vehicleType", "Compact" }
}),
new WorkItem <ReserveHotelActivity>(new WorkItemArguments {
{ "roomType", "Suite" }
}),
new WorkItem <ReserveFlightActivity>(new WorkItemArguments {
{ "destination", "DUS" }
})
});
// imagine these being completely separate processes with queues between them
_processes = new ActivityHost[]
{
new ActivityHost <ReserveCarActivity>(Send),
new ActivityHost <ReserveHotelActivity>(Send),
new ActivityHost <ReserveFlightActivity>(Send)
};
// hand off to the first address
Send(routingSlip.ProgressUri, routingSlip);
Console.ReadLine();
}
public override bool Compensate(WorkLog item, RoutingSlip routingSlip)
{
var reservationId = item.Result["reservationId"];
Console.WriteLine("Cancelled flight {0}", reservationId);
return(true);
}
private static void Send(Uri uri, RoutingSlip routingSlip)
{
// this is effectively the network dispatch
foreach (var process in _processes)
{
if (process.AcceptMessage(uri, routingSlip))
{
break;
}
}
}
public void ProcessBackwardMessage(RoutingSlip routingSlip)
{
if (!routingSlip.IsInProgress)
{
return;
}
// UndoLast can put new work on the routing slip
// and return false to go back on the forward
// path
if (routingSlip.UndoLast())
{
// recursion stands for passing context via message
// the routing slip can be fully serialized and passed
// between systems
this._send(routingSlip.CompensationUri, routingSlip);
}
else
{
this._send(routingSlip.ProgressUri, routingSlip);
}
}
public void ProcessForwardMessage(RoutingSlip routingSlip)
{
if (routingSlip.IsCompleted)
{
return;
}
// if the current step is successful, proceed
// otherwise go to the Unwind path
if (routingSlip.ProcessNext())
{
// recursion stands for passing context via message
// the routing slip can be fully serialized and passed
// between systems.
this._send(routingSlip.ProgressUri, routingSlip);
}
else
{
// pass message to unwind message route
this._send(routingSlip.CompensationUri, routingSlip);
}
}
public abstract bool Compensate(WorkLog item, RoutingSlip routingSlip);
public abstract bool AcceptMessage(Uri uri, RoutingSlip routingSlip);