Created
March 28, 2017 16:35
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Stream a Json array
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| { | |
| val akkaStream = "com.typesafe.akka" %% "akka-stream" % "2.4.17" | |
| val akkaStreamJson = "de.knutwalker" %% "akka-stream-json" % "3.2.0" | |
| val jawn = "org.spire-math" %% "jawn-parser" % "0.10.4" | |
| } |
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| import akka.NotUsed | |
| import akka.stream.scaladsl.Flow | |
| import akka.util.ByteString | |
| import jto.validation._ | |
| import play.api.libs.json._ | |
| object JsonStreaming { | |
| implicit val facade: jawn.Facade[JsValue] = | |
| new jawn.SimpleFacade[JsValue] { | |
| def jnull() = JsNull | |
| def jfalse() = JsBoolean(false) | |
| def jtrue() = JsBoolean(true) | |
| def jnum(s: String) = JsNumber(BigDecimal(s)) | |
| def jint(s: String) = JsNumber(BigDecimal(s)) | |
| def jstring(s: String) = JsString(s) | |
| def jarray(vs: List[JsValue]) = JsArray(vs) | |
| def jobject(vs: Map[String, JsValue]) = JsObject(vs.toSeq) | |
| } | |
| def flow[A](implicit r: RuleLike[JsValue, A]): Flow[ByteString, VA[A], NotUsed] = { | |
| de.knutwalker.akka.stream.JsonStreamParser.flow(jawn.AsyncParser.UnwrapArray).map(r.validate) | |
| } | |
| } |
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