The simplest way to try Dispatch is to clone the Twine example application from github.
git clone https://github.com/n8han/dispatch-twine.git
If you don’t have git available, you can download and extract the project’s current zip archive.
Twine is built with sbt 0.10. If you haven’t yet setup sbt, now
is a good time to do that. Once you have
sbt on your executable search
path, you can enter its interactive console for the Twine project.
cd dispatch-twine sbt
In sbt’s console, call the
On the first run this task will download Dispatch dependencies and
compile the Twine app. After that, you should see a message welcoming
you to the console and a friendly
First, import the main Dispatch classes and objects into scope.
Then, we’ll need an HTTP executor to carry out our requests.
val h = new Http
Requests are described with
dispatch.Request objects, and one way to
construct them is with a URL.
val req = url("http://www.scala-lang.org/")
This works because you’ve imported an object called
url from the
dispatch package, and the object is itself a function that creates
Now, we have an executor and a request. Dispatch needs to know how to handle the request.
val handler = req >>> System.out
With this complete request-response handler, Dispatch can execute the request. Assuming you have a network connection, that is.
And that was the source of the Scala home page. Of course, we don’t usually assign all these component parts to values unless we need to reuse them. Typically, the handler above would be written in one line.
h(url("http://www.scala-lang.org/") >>> System.out)
If you can’t wait to see more Dispatch verbs like
>>>, here’s a
colorful cheat sheet.