Ramon Buckland rbuckland
rbuckland
/ return-type-varies
Last active
August 29, 2015 14:16
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| def doWork[A: Numeric, B: Numeric](values: Seq[Option[A]], op: String): Option[B] = { | |
| import spire.implicits._ | |
| val v = values.flatten | |
| if (v.isEmpty) { | |
| None | |
| } else { | |
| op match { | |
| case "sum" => Some(v.qsum) // returns A | |
| case "avg" | "avg" => Some(v.qsum / v.length) // returns Double | |
| case "max" => Some(v.qmin) // A |
rbuckland
/ long-double.scala
Created
February 25, 2015 23:21
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| scala> val x:Double = Long.MaxValue // x: Double = 9.223372036854776E18 (9223372036854775807) | |
| scala> x == Long.MaxValue // Boolean = true | |
| scala> x.longValue == Long.MaxValue // Boolean = true | |
| scala> val y = 1234567890123456789L // y: Long = 1234567890123456789 // less than Long.MaxValue | |
| scala> y < x // Boolean = true | |
| scala> val z:Double = y // z: Double = 1.23456789012345677E18 | |
| scala> z == y // Boolean = true | |
| scala> z.longValue == y // Boolean = false // why ? MaxValue fits in the Double |
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| def safeSum[A: Numeric](as: Seq[A]):Option[A] = | |
| if (as.isEmpty) None else Some(as.qsum) | |
| def safeDiv[A: Numeric](a:Option[A], b:Option[A]):Option[Double] = (a,b) match { | |
| case (None,_) | (_,Some(0)) | (_,None) => None | |
| case (Some(x),Some(y)) => Some((x / y).toDouble()) | |
| } | |
| /** |
rbuckland
/ AddNewRegistrationSpec.scala
Created
April 23, 2014 20:25
JacksonUnmarshallingSpec for Spray. Just making sure that it is all still working.
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| package com.soqqo.luap.web.marshalling | |
| import org.scalatest.FlatSpec | |
| import org.scalatest.matchers.ShouldMatchers | |
| import io.straight.fw.spray.marshalling.JacksonUnmarshaller | |
| import com.soqqo.luap.messages.AddNewAccountTenantRegistration | |
| import spray.httpx.unmarshalling._ | |
| import spray.util._ | |
| import spray.http._ | |
| import spray.http.MediaTypes.`application/json` |
rbuckland
/ sealed-abstract-case-class-copy for Command messages.scala
Last active
September 30, 2021 10:36
Sometimes you just want to call the copy method for the same "parameters", but not care about what underlying type it is.Because case class .copy() methods are auto generated per case class, you can't call copy on the abstract class, so this approach uses some scala foo to generate a scala Function that generates the correct magic for you.
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| package com.soqqo.luap.messages | |
| import com.soqqo.luap.messages.ContextMetaData | |
| import com.soqqo.luap.messages.NoContextMetaData | |
| import com.soqqo.luap.messages.RegisterNewPerson | |
| import io.straight.fw.model.Uuid | |
| import scala.reflect.api.JavaUniverse | |
| import scala.reflect.api | |
| import io.straight.fw.jackson.JacksonBindingSupport._ | |
| import scala.Some |
rbuckland
/ CampusMessages.scala
Created
April 22, 2014 20:49
Sample to show / explain CommandMessage Enrichment of MetatData
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| import org.joda.time.DateTime | |
| import com.soqqo.luap.model.common.Address | |
| import io.straight.fw.model.Uuid | |
| import java.util.Date | |
| import akka.actor.ActorRef | |
| /* | |
| * file: CampusMessages.scala | |
| */ |
rbuckland
/ H2DatabaseGenerator.scala
Created
April 1, 2014 19:24
Creates a ZIP file from an XLS Spreadsheet uploaded to the client.Uses some magic foo and a spinkling of fun - see this at http://ete.straight.io
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| /** | |
| * @author rbuckland | |
| */ | |
| trait H2DatabaseGenerator extends CommonHttpService { | |
| val generateH2DbRoute = pathPrefix("h2generator") { | |
| // headerValueByName("Upload-File-Name") { filename => | |
| // headerValueByName("DatabaseName") { dbname => |
rbuckland
/ SbtConfigurationforHeroku.scala
Last active
March 12, 2016 11:39
This is some configuration I have used to run a a Scala base SBT webapp on Heroku. It mirrors that Java Maven way of using jetty-runner. The Heroku suggestion of using "sbt-start-script" is just bad.
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| /* | |
| This is some configuration I have used to run a a Scala base SBT webapp on Heroku. | |
| Heroku suggest using startscript. But this doesn;t work on Mac OSX *readline, it also uses an embedded jetty verison, and it uses the jetty distribution. | |
| Instead, Heroku suggest using jetty-runner with Java Maven projects (and I liked that a lot) so I am replicating that setup here. | |
| In short: | |
| 1. Ensure you have the xsbt-web-plugin |
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