Scala Reactive Programming

Lagom Service Descriptor

In Lagom Framework, we use the Service Descriptor to define the Lagom API interface. We define this Service Descriptor by overriding the descriptor function, which is defined in the service interface.

The service trait is defined with that descriptor function and some utilities, as shown here:

package com.lightbend.lagom.scaladsl.api 
trait Service {   
  def descriptor: Descriptor 
} 
 
object Service { 
  
  def named(name: String): Descriptor = Descriptor(name) 
 
  def call[Request, Response](method: ScalaMethodServiceCall[Request,   Response]): Call[Request, Response]  
   
  def namedCall[Request, Response](name: String, method: ScalaMethodServiceCall[Request, Response]): Call[Request, Response] def pathCall[Request, Response](pathPattern: ...