Web without framework
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This document provides feedback on a web application developed in Scala. It discusses using Scala and Akka for both the backend and frontend, with communication between them via websockets. The architecture proposed uses Scala.js to compile Scala code to JavaScript, allowing Actors implemented in Scala to manage the state of the user interface built with HTML, CSS, and JavaScript. Calling between Scala and JavaScript code is done through JSExport annotations. The benefits are a unified codebase and development paradigm across backend and frontend, while challenges include setting up the build and understanding JavaScript signatures when calling from Scala.
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msg match {
case Stats(data) =>
fsm ! UIStats(data)
case DSLStatement(ast) =>
fsm ! UINewDSL(ast)
case Customers(cust) =>
fsm ! UICustomerList(cust)
}
webSocket.onclose = { (event: CloseEvent) ⇒
fsm ! UIResetToPageNotInitialized
jQuery("#closedConnectionModal").modal("show")
}
webSocket
}
class UIManagerActor(modal: ModalComponent) extends Actor with FSM[UIState, UIData] {
def common: StateFunction = {
// common code for all states
case Event(msg@UICustomerList(cust), data) =>
logReceived(msg)
modal.buildModalCustomerSelection(cust, data.socket.get)
modal.buildModalFilesSelection(List.empty, data.socket.get)
stay()
}](https://image.slidesharecdn.com/webwithoutframework-161107132752/85/Web-without-framework-10-320.jpg)
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- 1. FEED BACK ON A WEB APPLICATION IN SCALA 28 october 2015 - Nicolas Jorand {{ SOFTSHAKE }}
- 2. TEAM • Software developper started with Java and then evolve to Scala • Currently working on reactive solution using Akka. • Some Knowledge of HTML, CSS and JavaScript Well 2 guys !
- 3. PROJECT • Perform data cleansing on csv file received by customers. • Not technical user • Get all the rules from the users to eventually process automatically the files. • Development time boxed to 20 days
- 4. USER INTERFACE ? • Input is CSV • Data manipulation evolving constantly • Output is CSV WHAT DO WE REALLY NEED ? • Use Excel as UI Never fits the needs Learning curve / Dev time HTMLTable DSL / Ace HTMLTable How to industrialise • Existing mapping tool • Framework (goJS, jointJS )
- 5. DEMO
- 6. UI WEB FRAMEWORK ? Evaluate, Read forums Do some tests Got it ! Learning curve 6 month later… StackOverflow Infinite Loop
- 7. DEV, NOT DESIGNER • How to get it responsive !! • Use a nice template (SmartAdmin) • How to integrate with web framework
- 8. WHAT I WOULD LIKE • Take the template and code the functionalities • Use only one language for back and front • User actions are events, just use the Actor Model. • Need a state at the UI level, the Finite State Machine (FSM)
- 9. ARCHITECTURE SmartAdmin Browser Ace Akka.js uPickle Scala.js Akka uPickle Scala.js Web Server Akka Files Processing Apache Commons CSV Asynchronous Blocking JSON Akka messages
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- 12. PRO / CONS • Code Isomorphe • Same paradigm • Type Safe • Team Building • Setup (No pattern) • Create UI components • Debug Actor on client • Understand JS signature
- 13. Questions ?