Kryo Macros

Scala macros that generate com.esotericsoftware.kryo.Serializer implementations in compile time, based on compile time reflection.

Features and limitations

• On top level only case classes are supported
• Fields of case classes can be other case classes, Scala collections, options, primitive or AnyVal types & classes, Scala enums, standard types & classes: String, Either, BigDecimal, java.time.Instant, scala.concurrent.duration.FiniteDuration, org.joda.time.DateTime
• Fields can be annotated as transient or just be not defined in constructor to avoid parsing and serializing
• For nested structures need to generate serializers for all case classes
• Implicitly defined mapping helpers are supported for ADT structures, simple alternative mappings, etc.
• Manual serializers can be used in generated code when defined as implicits

How to use

Add the following resolver

resolvers += Resolver.bintrayRepo("evolutiongaming", "maven")

Add the library to your dependencies list

libraryDependencies += "com.evolutiongaming" %% "kryo-macros" % "1.1.5"

Generate some serializers for your case classes

import com.evolutiongaming.kryo.Serializer

case class Player(name: String)

val serializer = Serializer.make[Player]

That's it! You have generated a com.esotericsoftware.kryo.Serializer implementation for your Player. You must know what to do with it if you are here :)

To see generated code just add the following line to your sbt build file

scalacOptions += "-Xmacro-settings:print-serializers"

For more examples, please, check out SerializerMacroSpec

How to develop

Run tests and check coverage for both Scala versions

sbt clean +coverage +test +coverageReport

Run benchmarks

sbt -no-colors clean 'benchmark/jmh:run -prof gc .*SerializerBenchmark.*' >results.txt