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Tommi Reiman 2017-11-11 16:52:32 +02:00
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# Different Routers
Reitit ships with several different implementations for the `Router` protocol, originally based on the [Pedestal](https://github.com/pedestal/pedestal/tree/master/route) implementation. `router` selects the most suitable implementation by inspecting the expanded routes. The implementation can be set manually using `:router` option, see [configuring routers](advanced/configuring_routers.md).
Reitit ships with several different implementations for the `Router` protocol, originally based on the [Pedestal](https://github.com/pedestal/pedestal/tree/master/route) implementation. `router` function selects the most suitable implementation by inspecting the expanded routes. The implementation can be set manually using `:router` option, see [configuring routers](advanced/configuring_routers.md).
| router | description |
| ------------------------------|-------------|
| `:linear-router` | Matches the routes one-by-one starting from the top until a match is found. Works with any kind of routes.
| `:lookup-router` | Fast router, uses hash-lookup to resolve the route. Valid if no paths have path or catch-all parameters.
| `:mixed-router` | Creates internally a `:linear-router` and a `:lookup-router` and used them to effectively get best-of-both-worlds. Valid if there are no [Route conflicts](../basics/route_conflicts.md).
| `::single-static-path-router` | Fastest possible router: valid only if there is one static route.
| `:prefix-tree-router` | TODO: https://github.com/julienschmidt/httprouter#how-does-it-work
| `:linear-router` | Matches the routes one-by-one starting from the top until a match is found. Works with any kind of routes. Slow, but works with all route trees.
| `:lookup-router` | Fast router, uses hash-lookup to resolve the route. Valid if no paths have path or catch-all parameters and there are no [Route conflicts](../basics/route_conflicts.md).
| `:mixed-router` | Creates internally a `:prefix-tree-router` and a `:lookup-router` and used them to effectively get best-of-both-worlds. Valid only if there are no [Route conflicts](../basics/route_conflicts.md).
| `::single-static-path-router` | Super fast router: sting-matches the route. Valid only if there is one static route.
| `:prefix-tree-router` | Router that creates a [prefix-tree](https://en.wikipedia.org/wiki/Radix_tree) out of an route table. Much faster than `:linear-router`. Valid only if there are no [Route conflicts](../basics/route_conflicts.md).
The router name can be asked from the router
The router name can be asked from the router:
```clj
(require '[reitit.core :as r])
(def router
(r/router
[["/ping" ::ping]
["/api/:users" ::users]]))
(r/router-name router)
; :mixed-router
```

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@ -5,7 +5,7 @@ Namespace `reitit.spec` contains [clojure.spec](https://clojure.org/about/spec)
**NOTE:** Use of specs requires to use one of the following:
* `[org.clojure/clojurescript "1.9.660"]` (or higher)
* `[org.clojure/clojure "1.9.0-beta2"]` (or higher)
* `[org.clojure/clojure "1.9.0-RC1"]` (or higher)
* `[clojure-future-spec "1.9.0-alpha17"]` (if Clojure 1.8 is used)
## Example