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scala_guide.md

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170 lines (128 loc) · 5.03 KB
title Scala Serialization Guide
sidebar_position 4
id scala_guide
license Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Fory supports all scala object serialization:

  • case class serialization supported
  • pojo/bean class serialization supported
  • object singleton serialization supported
  • collection serialization supported
  • other types such as tuple/either and basic types are all supported too.

Scala 2 and 3 are both supported.

Install

To add a dependency on Fory scala for scala 2 with sbt, use the following:

libraryDependencies += "org.apache.fory" % "fory-scala_2.13" % "0.10.3"

To add a dependency on Fory scala for scala 3 with sbt, use the following:

libraryDependencies += "org.apache.fory" % "fory-scala_3" % "0.10.3"

Quict Start

case class Person(name: String, id: Long, github: String)
case class Point(x : Int, y : Int, z : Int)

object ScalaExample {
  val fory: Fory = Fory.builder().withScalaOptimizationEnabled(true).build()
  // Register optimized fory serializers for scala
  ScalaSerializers.registerSerializers(fory)
  fory.register(classOf[Person])
  fory.register(classOf[Point])

  def main(args: Array[String]): Unit = {
    val p = Person("Shawn Yang", 1, "https://github.com/chaokunyang")
    println(fory.deserialize(fory.serialize(p)))
    println(fory.deserialize(fory.serialize(Point(1, 2, 3))))
  }
}

Fory creation

When using fory for scala serialization, you should create fory at least with following options:

import org.apache.fory.Fory
import org.apache.fory.serializer.scala.ScalaSerializers

val fory = Fory.builder().withScalaOptimizationEnabled(true).build()

// Register optimized fory serializers for scala
ScalaSerializers.registerSerializers(fory)

Depending on the object types you serialize, you may need to register some scala internal types:

fory.register(Class.forName("scala.Enumeration.Val"))

If you want to avoid such registration, you can disable class registration by ForyBuilder#requireClassRegistration(false). Note that this option allow to deserialize objects unknown types, more flexible but may be insecure if the classes contains malicious code.

And circular references are common in scala, Reference tracking should be enabled by ForyBuilder#withRefTracking(true). If you don't enable reference tracking, StackOverflowError may happen for some scala versions when serializing scala Enumeration.

Note that fory instance should be shared between multiple serialization, the creation of fory instance is not cheap.

If you use shared fory instance across multiple threads, you should create ThreadSafeFory instead by ForyBuilder#buildThreadSafeFory() instead.

Serialize case object

case class Person(github: String, age: Int, id: Long)
val p = Person("https://github.com/chaokunyang", 18, 1)
println(fory.deserialize(fory.serialize(p)))
println(fory.deserializeJavaObject(fory.serializeJavaObject(p)))

Serialize pojo

class Foo(f1: Int, f2: String) {
  override def toString: String = s"Foo($f1, $f2)"
}
println(fory.deserialize(fory.serialize(Foo(1, "chaokunyang"))))

Serialize object singleton

object singleton {
}
val o1 = fory.deserialize(fory.serialize(singleton))
val o2 = fory.deserialize(fory.serialize(singleton))
println(o1 == o2)

Serialize collection

val seq = Seq(1,2)
val list = List("a", "b")
val map = Map("a" -> 1, "b" -> 2)
println(fory.deserialize(fory.serialize(seq)))
println(fory.deserialize(fory.serialize(list)))
println(fory.deserialize(fory.serialize(map)))

Serialize Tuple

val tuple = Tuple2(100, 10000L)
println(fory.deserialize(fory.serialize(tuple)))
val tuple = Tuple4(100, 10000L, 10000L, "str")
println(fory.deserialize(fory.serialize(tuple)))

Serialize Enum

Scala3 Enum

enum Color { case Red, Green, Blue }
println(fory.deserialize(fory.serialize(Color.Green)))

Scala2 Enum

object ColorEnum extends Enumeration {
  type ColorEnum = Value
  val Red, Green, Blue = Value
}
println(fory.deserialize(fory.serialize(ColorEnum.Green)))

Serialize Option

val opt: Option[Long] = Some(100)
println(fory.deserialize(fory.serialize(opt)))
val opt1: Option[Long] = None
println(fory.deserialize(fory.serialize(opt1)))