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Scale

alt text

An example of Akka HTTP 2.5.1 library usage for building a REST service. The service itself takes median salary for the requested job title or related jobs from Glassdoor API.

What's implemented

application.conf

Since Glassdoor provides information only for registered application we need to add keys to apps configuration. To get keys go to Glassdoor API page to register your application. Configuration in your app.conf file will look like this

glassdoor {
  partner-id = "111111"
  key =	"asdffff111"
}

build.sbt

If you want to use it as an external library by calling a service directly or adding the routes

"com.github.danymarialee" %% "scale" % "1.0.0"

Usage by getting the code from github

sbt
> run

Then you'll see something like

[info] Running up.scale.Main 
[scale-service-akka.actor.default-dispatcher-5] INFO akka.event.slf4j.Slf4jLogger - Slf4jLogger started

Now you cal call the service to get median salary

curl http://localhost:9000/salary?job_title=driver

=>

{
   "data": {
       "title": "driver",
       "payMedian": 31000,
       "payCurrencyCode": "USD"
   },
   "code": 0
}

Or for related job titles

curl http://localhost:9000/salary/related?job_title=driver

=>

{
    "data": [
       {
         "title": "truck driver",
         "payMedian": 46000,
         "payCurrencyCode": "USD"
       },
       {
         "title": "delivery driver",
         "payMedian": 39000,
         "payCurrencyCode": "USD"
       },
       {
         "title": "bus driver",
         "payMedian": 26500,
         "payCurrencyCode": "USD"
       }
    ],
    "code": 0
}

Usage by calling with SalaryService

The SalaryService requires

  • ExecutionContext
  • ActorSystem
  • Materializer

Those are implicits => means need to be in the scope

import up.scale.services.SalaryService

val service = new SalaryService()

val exact = service.getJob("writer") // => Job
val related = service.getRelated("writer") // => List[Job]

Domain

case class Job(title: String, payMedian: Double, payCurrencyCode: String)

Testing

sbt
> test

=>

[test-salary-service-akka.actor.default-dispatcher-4] INFO akka.event.slf4j.Slf4jLogger - Slf4jLogger started
[info] SalaryServiceTest:
[info] The salary service
[info] - should return one job
[info] - should return related jobs
[info] GlassdoorResourceTest:
[info] The salary service
[info] - should return one job
[info] - should return related jobs
[info] - should return error from external service for related jobs request
[info] - should reject salary because of missing parameter job_title
[info] - should reject related salaries because of missing parameter job_title
[info] - should leave GET requests to other paths unhandled
[info] Run completed in 4 seconds, 102 milliseconds.
[info] Total number of tests run: 8
[info] Suites: completed 2, aborted 0
[info] Tests: succeeded 8, failed 0, canceled 0, ignored 0, pending 0
[info] All tests passed.
[success] Total time: 5 s, completed May 17, 2017 5:43:56 PM

If you have any questions my Twitter handle @besseifunction

Have fun!

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