codacy-badger/primenumbers-http4s-scala

Simple Scala/http4s-based web service for prime number checking.

Learning Objectives

• Show how CPU-intensive computation can be off-loaded from a mobile app to the cloud, by comparison to a mobile device, an unlimited resource for computation and storage.

• End-to-end example of continuous integration (CI), continuous deployment/delivery (CD), and DevOps in Scala.

See also the corresponding mobile app.

How to use

Test with

$ sbt test

Run with

$ sbt run

or

$ sbt stage
$ ./target/universal/stage/bin/primenumbers-http4s-scala

or deploy to a suitable APaaS provider, such as Heroku.

Then, http://host/n returns

• 200 OK if n is prime
• 404 Not Found otherwise

Sample prime numbers to try

• 1013
• 10007
• 100003
• 1000003
• 10000169
• 100000007

Sample non-prime numbers to try

• 999989

References

• Jason Christensen's OOPSLA 2009 presentation
• James Earl Douglas's SBTB 2014 presentation
• James Earl Douglas's Scala CI/CD/DevOps example: Travis, Coveralls, and Heroku