Akka HTTP is a toolkit for building REST APIs using Scala or Java. It provides an efficient, non-blocking I/O model and leverages the Actor system from Akka.
1. Define routes : Use the high-level routing DSL to define your API’s endpoints, specifying HTTP methods (GET, POST, etc.), paths, and request handling logic.
Example :
val route =
path("users" / IntNumber) { userId =>
get {
complete(getUser(userId))
} ~
put {
entity(as[User]) { user =>
complete(updateUser(userId, user))
}
}
}
2. Handle requests : Implement request handling logic in separate functions, typically involving actors for processing and returning results asynchronously.
Example :
def getUser(userId: Int): Future[HttpResponse] = {
// Interact with actor(s) to fetch data
}
def updateUser(userId: Int, user: User): Future[HttpResponse] = {
// Interact with actor(s) to update data
}?
3. Generate responses : Convert results into appropriate HTTP responses, including status codes and JSON serialization.
Example :
implicit val userFormat = jsonFormat3(User)
val jsonResponse = HttpResponse(entity = HttpEntity(ContentTypes.`application/json`, user.toJson.toString()))?
4. Start server : Bind the defined routes to a specific interface and port, starting the HTTP server.
Example :
Http().newServerAt("localhost", 8080).bind(route)?
