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Initial implementation.
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‎.github/workflows/ci.yml

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name: CI
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on:
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push:
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branches:
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- main
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pull_request:
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branches:
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- main
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jobs:
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test:
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runs-on: ubuntu-latest
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strategy:
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fail-fast: false
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matrix:
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scalaversion: ["2.11.12", "2.12.13", "2.13.5"]
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steps:
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- uses: actions/checkout@v2
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- uses: olafurpg/setup-scala@v10
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with:
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java-version: "[email protected]"
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- uses: coursier/cache-action@v5
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- uses: actions/checkout@v2
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with:
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repository: scala-js/scala-js
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ref: e38b86aef95ac074fe84e7fda3e22e08a723a91b
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path: ./scalajs-nightly
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- name: publishLocal Scala.js nightly
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run: |
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sbt ";ir2_12/publishLocal;linkerInterface2_12/publishLocal;linker2_12/publishLocal;testAdapter2_12/publishLocal;sbtPlugin/publishLocal"
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sbt ";compiler2_11/publishLocal;library2_11/publishLocal;testInterface2_11/publishLocal;testBridge2_11/publishLocal;jUnitRuntime2_11/publishLocal;jUnitPlugin2_11/publishLocal"
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sbt ";compiler2_12/publishLocal;library2_12/publishLocal;testInterface2_12/publishLocal;testBridge2_12/publishLocal;jUnitRuntime2_12/publishLocal;jUnitPlugin2_12/publishLocal"
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sbt ";compiler2_13/publishLocal;library2_13/publishLocal;testInterface2_13/publishLocal;testBridge2_13/publishLocal;jUnitRuntime2_13/publishLocal;jUnitPlugin2_13/publishLocal"
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working-directory: ./scalajs-nightly
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- name: Test JVM
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run: sbt "++${{ matrix.scalaversion }}" testSuiteJVM/test
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- name: Test JS
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run: sbt "++${{ matrix.scalaversion }}" testSuiteJS/test
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- name: Doc generation
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run: sbt "++${{ matrix.scalaversion }}" root/doc
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- name: Header check
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run: sbt "++${{ matrix.scalaversion }}" root/headerCheck testSuiteJVM/test:headerCheck testSuiteJS/test:headerCheck

‎.gitignore

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target/

‎build.sbt

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inThisBuild(Def.settings(
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crossScalaVersions := Seq("2.12.13", "2.11.12", "2.13.5"),
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scalaVersion := crossScalaVersions.value.head,
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version := "1.0.0-SNAPSHOT",
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organization := "org.scala-js",
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scalacOptions ++= Seq(
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"-encoding", "utf-8",
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"-deprecation",
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"-feature",
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"-Xfatal-warnings",
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),
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// Licensing
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homepage := Some(url("https://github.com/scala-js/scala-js-weakreferences")),
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startYear := Some(2013),
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licenses += (("Apache-2.0", url("https://www.apache.org/licenses/LICENSE-2.0"))),
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scmInfo := Some(ScmInfo(
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url("https://github.com/scala-js/scala-js-weakreferences"),
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"scm:git:[email protected]:scala-js/scala-js-weakreferences.git",
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Some("scm:git:[email protected]:scala-js/scala-js-weakreferences.git"))),
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// Publishing
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publishMavenStyle := true,
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publishTo := {
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val nexus = "https://oss.sonatype.org/"
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if (version.value.endsWith("-SNAPSHOT"))
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Some("snapshots" at nexus + "content/repositories/snapshots")
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else
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Some("releases" at nexus + "service/local/staging/deploy/maven2")
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},
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pomExtra := (
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<developers>
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<developer>
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<id>sjrd</id>
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<name>Sébastien Doeraene</name>
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<url>https://github.com/sjrd/</url>
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</developer>
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<developer>
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<id>gzm0</id>
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<name>Tobias Schlatter</name>
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<url>https://github.com/gzm0/</url>
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</developer>
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</developers>
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),
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pomIncludeRepository := { _ => false },
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))
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val commonSettings = Def.settings(
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// sbt-header configuration
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headerLicense := Some(HeaderLicense.Custom(
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s"""scalajs-weakreferences (${homepage.value.get})
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|
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|Copyright EPFL.
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|
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|Licensed under Apache License 2.0
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|(https://www.apache.org/licenses/LICENSE-2.0).
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|
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|See the NOTICE file distributed with this work for
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|additional information regarding copyright ownership.
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|""".stripMargin
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)),
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)
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lazy val root: Project = project.in(file("."))
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.enablePlugins(ScalaJSPlugin)
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.settings(commonSettings: _*)
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.settings(
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name := "scalajs-weakreferences",
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Compile / packageBin / mappings ~= {
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_.filter(!_._2.endsWith(".class"))
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},
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exportJars := true,
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)
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lazy val testSuite = crossProject(JSPlatform, JVMPlatform)
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.in(file("test-suite"))
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.jsConfigure(_.enablePlugins(ScalaJSJUnitPlugin))
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.settings(commonSettings: _*)
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.settings(
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testOptions += Tests.Argument(TestFramework("com.novocode.junit.JUnitFramework"), "-v", "-a"),
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)
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.jsConfigure(_.dependsOn(root))
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.jvmSettings(
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libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % "test",
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)

‎project/build.properties

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sbt.version=1.5.2

‎project/plugins.sbt

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addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.6.0-SNAPSHOT")
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addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.0.0")
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addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.6.0")

‎src/main/scala/java/lang/ref/Reference.scala

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/*
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* scalajs-weakreferences (https://github.com/scala-js/scala-js-weakreferences)
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*
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* Copyright EPFL.
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*
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* Licensed under Apache License 2.0
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* (https://www.apache.org/licenses/LICENSE-2.0).
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*
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* See the NOTICE file distributed with this work for
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* additional information regarding copyright ownership.
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*/
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package java.lang.ref
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import scala.scalajs.js
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/* The JavaDoc says that the methods are concrete in `Reference`, and not
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* overridden in `WeakReference`. To mimic this setup, and since
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* `WeakReference` is the only implemented subclass, we actually implement the
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* behavior of `WeakReference` in `Reference`.
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*/
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abstract class Reference[T] private[ref] (referent: T, queue: ReferenceQueue[_ >: T]) {
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private[this] var weakRef = new js.WeakRef(referent)
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private[ref] var enqueued: Boolean = false
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if (queue != null)
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queue.register(this, referent)
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def get(): T =
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if (weakRef == null) null.asInstanceOf[T]
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else weakRef.deref().getOrElse(null.asInstanceOf[T])
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def clear(): Unit = {
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if (queue != null)
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queue.unregister(this)
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weakRef = null
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}
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def isEnqueued(): Boolean =
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enqueued
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def enqueue(): Boolean = {
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if (queue != null && queue.enqueue(this)) {
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queue.unregister(this)
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true
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} else {
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false
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}
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}
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}

‎src/main/scala/java/lang/ref/ReferenceQueue.scala

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/*
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* scalajs-weakreferences (https://github.com/scala-js/scala-js-weakreferences)
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*
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* Copyright EPFL.
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*
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* Licensed under Apache License 2.0
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* (https://www.apache.org/licenses/LICENSE-2.0).
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*
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* See the NOTICE file distributed with this work for
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* additional information regarding copyright ownership.
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*/
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package java.lang.ref
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import scala.scalajs.js
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class ReferenceQueue[T] {
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import ReferenceQueue._
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private[this] var first: Node[T] = null
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private[this] var last: Node[T] = null
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private[this] val finalizationRegistry = {
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new js.FinalizationRegistry[T, Reference[_ <: T], Reference[_ <: T]]({
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(ref: Reference[_ <: T]) => enqueue(ref)
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})
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}
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private[ref] def register(ref: Reference[_ <: T], referent: T): Unit =
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finalizationRegistry.register(referent, ref, ref)
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private[ref] def unregister(ref: Reference[_ <: T]): Unit =
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finalizationRegistry.unregister(ref)
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private[ref] def enqueue(ref: Reference[_ <: T]): Boolean = {
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if (ref.enqueued) {
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false
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} else {
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ref.enqueued = true
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val newNode = new Node[T](ref, null)
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if (last == null)
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first = newNode
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else
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last.next = newNode
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last = newNode
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true
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}
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}
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def poll(): Reference[_ <: T] = {
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val result = first
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if (result != null) {
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first = result.next
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result.ref
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} else {
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null
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}
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}
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// Not implemented because they have a blocking contract:
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//def remove(timeout: Long): Reference[_ <: T] = ???
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//def remove(): Reference[_ <: T] = ???
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}
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private object ReferenceQueue {
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private final class Node[T](val ref: Reference[_ <: T], var next: Node[T])
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}

‎src/main/scala/java/lang/ref/WeakReference.scala

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/*
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* scalajs-weakreferences (https://github.com/scala-js/scala-js-weakreferences)
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*
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* Copyright EPFL.
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*
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* Licensed under Apache License 2.0
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* (https://www.apache.org/licenses/LICENSE-2.0).
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*
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* See the NOTICE file distributed with this work for
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* additional information regarding copyright ownership.
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*/
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package java.lang.ref
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class WeakReference[T](referent: T, q: ReferenceQueue[_ >: T])
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extends Reference[T](referent, q) {
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def this(referent: T) = this(referent, null)
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}

‎test-suite/shared/src/test/scala/org/scalajs/testsuite/javalib/lang/ref/WeakReferenceTest.scala

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/*
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* scalajs-weakreferences (https://github.com/scala-js/scala-js-weakreferences)
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*
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* Copyright EPFL.
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*
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* Licensed under Apache License 2.0
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* (https://www.apache.org/licenses/LICENSE-2.0).
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*
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* See the NOTICE file distributed with this work for
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* additional information regarding copyright ownership.
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*/
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package org.scalajs.testsuite.javalib.lang.ref
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import java.lang.ref._
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import java.lang.StringBuilder
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import org.junit.Test
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import org.junit.Assert._
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class WeakReferenceTest {
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@Test def allOperationsWithoutQueue(): Unit = {
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val obj = new StringBuilder("foo")
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val ref = new WeakReference(obj)
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assertSame(obj, ref.get())
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assertEquals(false, ref.enqueue())
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assertEquals(false, ref.isEnqueued())
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ref.clear()
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assertNull(ref.get())
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assertEquals(false, ref.isEnqueued())
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}
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@Test def explicitEnqueue(): Unit = {
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val obj = new StringBuilder("foo")
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val queue = new ReferenceQueue[Any]
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val ref = new WeakReference(obj, queue)
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assertSame(obj, ref.get())
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assertNull(queue.poll())
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assertFalse(ref.isEnqueued())
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assertTrue(ref.enqueue())
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assertTrue(ref.isEnqueued())
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assertSame(ref, queue.poll())
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assertNull(queue.poll())
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assertSame(obj, ref.get())
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assertFalse(ref.enqueue())
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}
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@Test def clearDoesNotEnqueue(): Unit = {
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val obj = new StringBuilder("foo")
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val queue = new ReferenceQueue[Any]
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val ref = new WeakReference(obj, queue)
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assertSame(obj, ref.get())
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assertNull(queue.poll())
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assertFalse(ref.isEnqueued())
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ref.clear()
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assertNull(ref.get())
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assertFalse(ref.isEnqueued())
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assertNull(queue.poll())
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// Can still enqueue after that
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assertTrue(ref.enqueue())
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assertTrue(ref.isEnqueued())
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assertSame(ref, queue.poll())
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}
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@Test def twoWeakReferencesOverTheSameObjectInQueue(): Unit = {
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val obj = new StringBuilder("foo")
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val queue = new ReferenceQueue[Any]
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val ref1 = new WeakReference(obj, queue)
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val ref2 = new WeakReference(obj, queue)
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assertSame(obj, ref1.get())
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assertSame(obj, ref2.get())
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ref1.enqueue()
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ref2.enqueue()
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val polled1 = queue.poll()
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val polled2 = queue.poll()
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assertTrue(polled1 == ref1 || polled1 == ref2)
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assertTrue(polled2 == ref1 || polled2 == ref2)
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assertNotSame(polled1, polled2)
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assertNull(queue.poll())
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}
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}

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