Building a routing slip

Developers are discouraged from directly implementing the RoutingSlip message type and should instead use a RoutingSlipBuilder to create a routing slip. The RoutingSlipBuilder encapsulates the creation of the routing slip and includes methods to add activities, activity logs, and variables to the routing slip. For example, to create a routing slip with two activities and an additional variable, a developer would write:

var builder = new RoutingSlipBuilder(NewId.NextGuid());
builder.AddActivity("DownloadImage", "rabbitmq://localhost/execute_downloadimage", 
    new
    {
        ImageUri = new Uri("http://images.google.com/someImage.jpg")
    });
builder.AddActivity("FilterImage", "rabbitmq://localhost/execute_filterimage");
builder.AddVariable("WorkPath", "\\dfs\work");

var routingSlip = builder.Build();

Each activity requires a name for display purposes and a URI specifying the execution address. The execution address is where the routing slip should be sent to execute the activity. For each activity, arguments can be specified that are stored and presented to the activity via the activity arguments interface type specify by the first argument of the Activity interface. The activities added to the routing slip are combined into an Itinerary, which is the list of activities to be executed, and stored in the routing slip.

Managing the inventory of available activities, as well as their names and execution addresses, is the responsibility of the application and is not part of the MassTransit Courier. Since activities are application specific, and the business logic to determine which activities to execute and in what order is part of the application domain, the details are left to the application developer.

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