About the repo

• GraphQL kotlin spring boot server for demoing Kotlin co-routines

Demo Setup

• Requires java 11.0.3 or higher
• mvn clean install
• git fetch --tags to pull down all the tags
• mvn spring-boot:run will start up server and playground can be accessed at http://localhost:8080/playground
• GraphQL query:

query {
  propertyResults {
    properties {
      id
      neighborhoodName
      name
    }
    filters {
      filterType
      options
    }
  }
}

Session details

Downstream calls

Workshop

During the session we will demo how to convert PropertyResults downstream calls to lazy co-routines

• step-0 Non lazy version of downstream services (git checkout step-0)
• step-1 Duplicate downstream calls (git checkout step-1)
• step-2 Converting PropertyResults to lazy (git checkout step-2)

Hands-on coding assignment

• Steps needed to convert PropertyResults.properties to lazy
  • Pull down latest from master. This will set us up till step-2
  • Convert Property data class fields to function equivalent
  • Convert propertyContentResponse in PropertyResultsService to a lazy Coroutine
  • Pass in Deferred propertyContentResponse and a Deferred gaiaNeighborhoodResponse to PropertiesAdapter.adapt and Property
  • await on deferred responses at the appropriate place in Property class