Initial implementation

.gitignore

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 target/
 .project
 .classpath
+.cache
+.target/
+*~
+.#*
+.*.swp
+.DS_Store
+.codefellow
+.ensime*
+.eprj
+.history
+.idea

COPYING

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LICENSE

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+Licensed under Public Domain (CC0)
+
+To the extent possible under law, the person who associated CC0 with
+this code has waived all copyright and related or neighboring
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README.md

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+## Reactive Streams
+
+This project consists of a set of interfaces and a TCK defining Reactive Streams. The textual description of the semantics verified by the TCK can be found in `tck/src/main/resources/spec.txt`.
+
+### Legal
+
+This project is a collaboration between Netflix, Twitter, RedHat, Pivotal and Typesafe. The code is offered to the Public Domain in order to allow free use by interested parties who want to create compatible implementations. For details see `COPYING`.

build.sbt

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+organization := "org.asyncrx"
+
+version := "0.1-SNAPSHOT"
+
+licenses := Seq("CC0" -> url("http://creativecommons.org/publicdomain/zero/1.0/"))
+
+homepage := Some(url("https://groups.google.com/forum/?hl=en#!forum/reactive-streams"))
+
+scalaVersion := "2.10.3"
+
+lazy val spi = project
+
+lazy val tck = project.dependsOn(spi)

project/build.properties

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+sbt.version=0.13.1

spi/build.sbt

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+organization := "asyncrx"
+
+name := "reactive-streams-spi"

spi/src/main/scala/asyncrx/api/Processor.scala

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+package asyncrx.api
+
+/**
+ * A Processor is a stand-alone representation of a transformation for
+ * elements from In to Out types. Implementations of this API will provide
+ * factory methods for creating Processors and connecting them to
+ * [[Producer]] and [[Consumer]].
+ */
+trait Processor[In, Out] extends Consumer[In] with Producer[Out]

spi/src/main/scala/asyncrx/api/Producer.scala

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+package asyncrx
+package api
+
+/**
+ * A Producer is the logical source of elements of a given type. 
+ * The underlying implementation is done by way of a [[asyncrx.spi.Publisher]].
+ * This interface is the user-level API for a source while a Publisher is the
+ * SPI.
+ * 
+ * Implementations of this interface will typically offer domain- or language-specific
+ * methods for transforming or otherwise interacting with the produced stream of elements.
+ */
+trait Producer[T] {
+
+  /**
+   * Get the underlying Publisher for this Producer. This method should only be used by
+   * implementations of this API.
+   */
+  def getPublisher: spi.Publisher[T]
+}
+
+/**
+ * A Consumer is the logical sink of elements of a given type.
+ * The underlying implementation is done by way of a [[asyncrx.spi.Subscriber]].
+ * This interface is the user-level API for a sink while a Subscriber is the SPI.
+ * 
+ * Implementations of this interface will typically offer domain- or language-specific
+ * methods for transforming or otherwise interacting with the stream of elements.
+ */
+trait Consumer[T] {
+
+  /**
+   * Get the underlying Subscriber for this Consumer. This method should only be used by
+   * implementations of this API.
+   */
+  def getSubscriber: spi.Subscriber[T]
+}

spi/src/main/scala/asyncrx/spi/Publisher.scala

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+package asyncrx.spi
+
+/**
+ * A Subscription models the relationship between a [[Publisher]] and a [[Subscriber]].
+ * The Subscriber receives a Subscription so that it can ask for elements to be delivered
+ * using [[Subscription#requestMore]]. The Subscription can be disposed of by canceling it.
+ */
+trait Subscription {
+
+  /**
+   * Cancel this subscription. The [[Publisher]] to which produced this Subscription 
+   * will eventually stop sending more elements to the [[Subscriber]] which owns
+   * this Subscription. This may happen before the requested number of elements has
+   * been delivered, even if the Publisher would still have more elements.
+   */
+  def cancel(): Unit
+
+  /**
+   * Request more data from the [[Publisher]] which produced this Subscription.
+   * The number of requested elements is cumulative to the number requested previously.
+   * The Publisher may eventually publish up to the requested number of elements to
+   * the [[Subscriber]] which owns this Subscription.
+   */
+  def requestMore(elements: Int): Unit
+}
+
+/**
+ * A Publisher is a source of elements of a given type. One or more [[Subscriber]] may be connected
+ * to this Publisher in order to receive the published elements, contingent on availability of these
+ * elements as well as the presence of demand signaled by the Subscriber via [[Subscription#requestMore]].
+ */
+trait Publisher[T] {
+
+  /**
+   * Subscribe the given [[Subscriber]] to this Publisher. A Subscriber can at most be subscribed once
+   * to a given Publisher, and to at most one Publisher in total.
+   */
+  def subscribe(subscriber: Subscriber[T]): Unit
+}
+
+/**
+ * A Subscriber receives elements from a [[Publisher]] based on the [[Subscription]] it has.
+ * The Publisher may supply elements as they become available, the Subscriber signals demand via 
+ * [[Subscription#requestMore]] and elements from when supply and demand are both present.
+ */
+trait Subscriber[T] {
+
+  /**
+   * The [[Publisher]] generates a [[Subscription]] upon [[Publisher#subscribe]] and passes
+   * it on to the Subscriber named there using this method. The Publisher may choose to reject
+   * the subscription request by calling [[#onError]] instead.
+   */
+  def onSubscribe(subscription: Subscription): Unit
+
+  /**
+   * The [[Publisher]] calls this method to pass one element to this Subscriber. The element
+   * must not be <code>null</code>. The Publisher must not call this method more often than
+   * the Subscriber has signaled demand for via the corresponding [[Subscription]].
+   */
+  def onNext(element: T): Unit
+
+  /**
+   * The [[Publisher]] calls this method in order to signal that it terminated normally.
+   * No more elements will be forthcoming and none of the Subscriber’s methods will be
+   * called hereafter.
+   */
+  def onComplete(): Unit
+
+  /**
+   * The [[Publisher]] calls this method to signal that the stream of elements has failed
+   * and is being aborted. The Subscriber should abort its processing as soon as possible.
+   * No more elements will be forthcoming and none of the Subscriber’s methods will be
+   * called hereafter.
+   * 
+   * This method is not intended to pass validation errors or similar from Publisher to Subscriber
+   * in order to initiate an orderly shutdown of the exchange; it is intended only for fatal
+   * failure conditions which make it impossible to continue processing further elements.
+   */
+  def onError(cause: Throwable): Unit
+}

tck/build.sbt

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+organization := "asyncrx"
+
+name := "reactive-streams-tck"
+
+libraryDependencies += "org.testng" % "testng" % "5.14.10"