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The result of the final function is assigned to the Response property so that the framework or handler can use it when building any response message. The RouteData object gets passed in to each final function, providing it with any context it needs to respond to the request. The RouteData object is an instance of a class implementing the IRouteData interface:īool NoMatchingFinalFunction

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What the engine does provide however is a set of results and flags in the form of the RouteData object that any framework or middleware is free to make use of as it likes. This affords the maximum amount of flexibility, for example although a final function is mandatory when we use the Superscribe Owin Handler, when using Superscribe with Web Api we rely on it's internal pipeline to service the request and route to a controller/action accordingly. It is worth noting that the Route Engine never responds to requests directly, it is up to the framework or handler middleware to perform that task. Var justHelloRoute = new ConstantNode("Hello")

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Zip function to combine the two 'Hello' nodes into one: The following snippet shows how we can assign one, and demonstrates the behavior of the. This is because the "Hello" node itself does not provide a Final Function, and the Superscribe Handler has no other way of responding to the request. "/Hello" -> 405 - No final function was configured for this method When running using the Superscribe Handler middleware for Owin, the samples above create an app that will respond to '/' and '/Hello/World', but not 'Hello':

Superscribe music software code#

it will combine any equivilent nodes (See the next code block for an example).

Finally, the Zip function performs a similar function to.

Slash returns the child "World" node but we want to create an edge in the base node that points to the "Hello" node.

The Base function returns the topmost parent of a node.

The Slash function creates an edge between two nodes and then returns the child node.

The ConstantNode as it's name suggests, will only match a route segment that is identical to the value passed to it in the constructor.

Slash, Zip and Base, as well as a new subclass of GraphNode, the ConstantNode. The above sample introduces some of the methods that the GraphNode class provides. (new FinalFunction("GET", o => "Hello World")) Var helloRoute = new ConstantNode("Hello").Slash(new ConstantNode("World")) To respond to the uri in the link, we need to add some more nodes to our graph: In this case we have configured Superscribe to respond to a GET request to '/', returning a message and a link. Multiple final functions can be supplied, each responding to a different HTTP method. All other nodes in Superscribe derive from this class, and is the building block of all route definitions.įor example, if we want to respond to a request to '/', we need to provide the base node with a Final Function:Į(new FinalFunction("GET", o => to SuperscribeĪ Final Function is associated with an HTTP method and executed when routing finishes at a particular node. Base property of the Route Engine, and is an instance of type GraphNode. Within each instance of a RouteEngine there is a Base node that represents the root '/' url and is also the parent for any susequent route definitions. Graph Based Routing definitions are constructed using strongly typed nodes and then stored as a graph.

Usually - as in most examples on this site - only one is needed (although it is possible to transfer control from one to another when moving between frameworks or application layers). You can have as many instances of IRouteEngine as you like, and they will operate indenpendently. Var engine = OwinRouteEngineFactory.Create() Var engine = RouteEngineFactory.Create() You can obtain an instance using the static factory classes provided, as follows: There are currently two Route Engine implementations, one for WebApi, and one for Owin. Superscribe's features are all accessed via an instance of a class that implements IRouteEngine. As a result, this section should be considered required reading before continuing to the later topics The IRouteEngine interface However, to work with Superscribe effectively and to lessen any learning curves, it is useful to understand what is going on behind the scenes. In practice you won't want to write routes using the Fluent API, as they won't look very nice and will be quite verbose instead you'll be using the simple-syntax wherever possible. Defining routes using superscribe's fluent interface