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Version 3.5.2 (October 8, 2026)

This is a bug-fixing release for the 3.5.x series.

Fixes:

  • Monix 3.5.1 failed on any JDK older than 27, including the supported minimum of 17, with UnsupportedClassVersionError (class file version 71.0), because the Java classes in its artifacts were compiled for JDK 27, the version used by the release workflow; Java sources are now compiled with -source and -target set to 17 (#2085, #2086).

This release was made possible by the work and feedback of:

  • Alexandru Nedelcu (@alexandru)
  • Kenji Yoshida (@xuwei-k)

Version 3.5.1 (October 7, 2026)

This is a bug-fixing release for the 3.5.x series.

Fixes:

  • Observable.fromInputStream and Observable.fromInputStreamUnsafe now emit a chunk as soon as no more bytes are currently available from the underlying InputStream, instead of blocking until the buffer fills up (#1479, #2082).
  • The Reactive Streams bridges (Observer.toReactiveSubscriber, Subscriber.toReactiveSubscriber, Subject.toReactiveProcessor) and Task.parSequenceUnordered now derive their buffer and batching sizes from Platform.recommendedBatchSize instead of the scheduler's ExecutionModel#recommendedBatchSize, which is effectively unbounded for ExecutionModel.SynchronousExecution and resulted in unbounded buffers with no backpressure (#1670, #2081).

Build and publishing:

  • Automatic snapshot releases from main were disabled; publishing now happens by triggering the manual-publish workflow.
  • The build was updated to sbt 1.13.0, with sbt plugin updates such as Scala.js 1.22.0 and sbt-mima 1.2.1; runtime dependencies are unchanged.

This release was made possible by the work and feedback of:

  • Alexandru Nedelcu (@alexandru)
  • Jakub Pinowski (@Pinioo)
  • Kamil Podsiadło (@kpodsiad)
  • Kenji Yoshida (@xuwei-k)
  • Roman Janusz (@ghik)
  • Tomasz Godzik (@tgodzik)

Version 3.5.0 (August 24, 2026)

This is the first Monix release since 3.4.1. It updates the supported runtime and Scala versions and includes several concurrency and scheduler fixes.

Breaking changes:

  • JDK 17 is now the minimum supported runtime and build target.
  • JDK 21 is now part of the validated support matrix.
  • Scala 2.12 support is dropped.
  • The supported Scala versions are now 2.13.18 and 3.3.7.
  • Legacy sun.misc.Unsafe-based internals were removed in favor of JDK VarHandle-based implementations.

Fixes and improvements:

  • Scheduled task failures are now reported to the configured UncaughtExceptionReporter by ScheduledExecutorService-backed schedulers and the Scala.js AsyncScheduler (#2036).
  • Forked Trampoline executions no longer share mutable, non-thread-safe queues across threads, preventing dropped or stuck tasks and memory consistency errors (#2031).
  • Zip2Observable through Zip6Observable now synchronize completion and error signaling at their call sites, avoiding re-entrant synchronization and stale reads (#2040).
  • DynamicWorkerThreadFactory delegates maximum thread-count management to ForkJoinPool (#1589).
  • Invalid-state errors from MapTaskObservable now include the mapping function to improve diagnostics (#2030).
  • Scala.js scheduling now uses MacrotaskExecutor (#1522).

Modules and dependencies:

  • Added the monix-execution-atomic module (#1561).
  • Updated Cats to 2.13.0 and Cats Effect to 2.5.5.
  • Updated Scala.js to 1.21.0 and JCTools to 4.0.6.
  • Published artifacts now declare the semver-spec version scheme.

Build and publishing:

  • Maven Central publishing now uses the Central Portal, including automatic snapshot publication from main.
  • Scaladoc JARs omit bundled fonts and Inkuire assets to reduce their size.

This release was made possible by the work and feedback of:

  • Alexandru Nedelcu (@alexandru)
  • Mikołaj Bul (@mikkolaj)
  • Bartłomiej Kozak (@halotukozak)
  • Łukasz Petka (@lpetka)
  • Roman Janusz
  • Arman Bilge (@armanbilge)
  • Kenji Yoshida

Version 3.4.1 (May 7, 2022)

This is a minor bug-fixing release for the 3.x series.

Updated dependencies (#1554):

  • Scala compiler updated to 2.12.15, 2.13.8 and 3.1.2;
  • Typelevel Cats updated to 2.7.0;
  • Typelevel Cats-Effect updated to 2.5.4;
  • Updated compiler and sbt plugins to latest versions;

Fixes:

  • Trampoline.trampolineContext no longer ignores its parent BlockContext (#1544)
  • Only include JCTools in executionShadedJCTools (#1514)

This release was made possible by the work and feedback of:

  • Alexandru Nedelcu (@alexandru)
  • Gabriele Petronella (@gabro)
  • Roman Janusz (@ghik)

Version 3.4.0 (May 14, 2021)

The release is binary and source compatible with 3.x series, and was cross-built for the following Scala and ScalaJS versions:

  • Scala 2.12, 2.13 and 3.0
  • Scala.js 1.5.1

WARN: we're dropping compatibility with Scala 2.11 and ScalaJS 0.6.x. If you still need those you'll have to stay on version 3.3.0.

Changes in this release:

  • Dropped support for Scala 2.11 and Scala.js 0.6.x
  • Dependency updates:
    • Cats 2.6.1
    • Cats-Effect 2.5.1
    • JCTools 3.3.0
  • Adds support for Scala 3 (#1326, #1327, #1328, #1329, #1344, #1323)
  • Adds Observable.whileBusyAggregateEvents (#1320)
  • Fix tracing in Coeval and Task via a more accurate filter (#1353)
  • Adds Observable.throttleLatest (#1396)
  • Implement pagination for Observable (#1381)

This release was made possible by the work and feedback of:

  • Alexandru Nedelcu (@alexandru)
  • Dominik Wosiński (@Wosin)
  • Lars Hupel (@larsrh)
  • Luke Stephenson (@lukestephenson)
  • Oleg Pyzhcov (@oleg-py)
  • Pau Alarcón (@paualarco)
  • Piotr Gawryś (@Avasil)

Version 3.3.0 (Nov 7, 2020)

The release is binary and source compatible with 3.x.x line. It is released for the following Scala and ScalaJS versions:

  • Scala 2.11: ScalaJS 0.6.x
  • Scala 2.12: ScalaJS 0.6.x and 1.3.x
  • Scala 2.13: ScalaJS 0.6.x and 1.3.x

Note that most likely, this is going to be the last release on ScalaJS 0.6.x. We can consider doing backports on-demand.

Highlights

Better Stack Traces

This release includes a highly requested feature of better stack traces for Task and Coeval! Big thanks to @RaasAhsan and @djspiewak for providing the original implementation that we have ported.

They are enabled by default, but it is configurable. Refer to Stack Traces section for more details.

We have measured about 10-30% performance hit in CACHED mode (the default) in microbenchmarks. If you have any performance tests, we would greatly appreciate any reports! If the hit is too big, you can disable the stack traces with -Dmonix.eval.stackTracingMode=none.

For the following code:

package test.app

import monix.eval.Task
import monix.execution.Scheduler
import cats.implicits._
import scala.concurrent.duration._

object TestTracingApp extends App {
  implicit val s = Scheduler.global

  def customMethod: Task[Unit] =
    Task.now(()).guarantee(Task.sleep(10.millis))

  val tracingTestApp: Task[Unit] = for {
    _ <- Task.shift
    _ <- Task.unit.attempt
    _ <- (Task(println("Started the program")), Task.unit).parTupled
    _ <- customMethod
    _ <- if (true) Task.raiseError(new Exception("boom")) else Task.unit
  } yield ()

  tracingTestApp.onErrorHandleWith(ex => Task(ex.printStackTrace())).runSyncUnsafe
}

The default (cached) stack trace is going to be:

java.lang.Exception: boom
        at test.app.TestTracingApp$.$anonfun$tracingTestApp$5(TestTracingApp.scala:36)
        at guarantee @ test.app.TestTracingApp$.customMethod(TestTracingApp.scala:29)
        at flatMap @ test.app.TestTracingApp$.$anonfun$tracingTestApp$4(TestTracingApp.scala:35)
        at parTupled @ test.app.TestTracingApp$.$anonfun$tracingTestApp$2(TestTracingApp.scala:34)
        at parTupled @ test.app.TestTracingApp$.$anonfun$tracingTestApp$2(TestTracingApp.scala:34)
        at flatMap @ test.app.TestTracingApp$.$anonfun$tracingTestApp$2(TestTracingApp.scala:34)
        at flatMap @ test.app.TestTracingApp$.$anonfun$tracingTestApp$1(TestTracingApp.scala:33)
        at flatMap @ test.app.TestTracingApp$.delayedEndpoint$test$app$TestTracingApp$1(TestTracingApp.scala:32)

Before 3.3.0 and with stack traces disabled, stack traces are a mess:

java.lang.Exception: boom
        at test.app.TestTracingApp$.$anonfun$tracingTestApp$5(TestTracingApp.scala:36)
        at monix.eval.internal.TaskRunLoop$.startFull(TaskRunLoop.scala:188)
        at monix.eval.internal.TaskRestartCallback.syncOnSuccess(TaskRestartCallback.scala:101)
        at monix.eval.internal.TaskRestartCallback$$anon$1.run(TaskRestartCallback.scala:118)
        at monix.execution.internal.Trampoline.monix$execution$internal$Trampoline$$immediateLoop(Trampoline.scala:66)
        at monix.execution.internal.Trampoline.startLoop(Trampoline.scala:32)
        at monix.execution.schedulers.TrampolineExecutionContext$JVMNormalTrampoline.super$startLoop(TrampolineExecutionContext.scala:142)
        at monix.execution.schedulers.TrampolineExecutionContext$JVMNormalTrampoline.$anonfun$startLoop$1(TrampolineExecutionContext.scala:142)
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
        at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:94)
        at monix.execution.schedulers.TrampolineExecutionContext$JVMNormalTrampoline.startLoop(TrampolineExecutionContext.scala:142)
        at monix.execution.internal.Trampoline.execute(Trampoline.scala:40)
        at monix.execution.schedulers.TrampolineExecutionContext.execute(TrampolineExecutionContext.scala:57)
        at monix.execution.schedulers.BatchingScheduler.execute(BatchingScheduler.scala:50)
        at monix.execution.schedulers.BatchingScheduler.execute$(BatchingScheduler.scala:47)
        at monix.execution.schedulers.AsyncScheduler.execute(AsyncScheduler.scala:31)
        at monix.eval.internal.TaskRestartCallback.onSuccess(TaskRestartCallback.scala:72)
        at monix.eval.internal.TaskRunLoop$.startFull(TaskRunLoop.scala:183)
        at monix.eval.internal.TaskRestartCallback.syncOnSuccess(TaskRestartCallback.scala:101)
        at monix.eval.internal.TaskRestartCallback.onSuccess(TaskRestartCallback.scala:74)
        at monix.eval.internal.TaskSleep$SleepRunnable.run(TaskSleep.scala:71)
        at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402)
        at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
        at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
        at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
        at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

Better Task => Future interop when using Local

Running Task isolates Local, which was not available in the Future, resulting in runToFuture. This release enables it and unblocks compelling use cases, such as reading proper request context in Akka HTTP Directive. We've created an AkkaHTTP Example that demonstrates it.

Latest behavior is:

implicit val s: Scheduler = Scheduler.Implicits.traced

val local = Local(0)

for {
  _  <- Task(local.update(1)).runToFuture
  value <- Future(local.get)
} yield println(s"Local value in Future $value")

println(s"Local value on the current thread = $value")

// => Local value on the current thread = 0
// => Local value in Future = 1

Task still isolates the Local, but the Future continuation keeps the same reference and can read it. Before the change, Local would be 0 in the Future.

More information about Local can be found in the new Local documentation.

Relevant updates

  • #1205: Observable.mergePrioritizedList
  • #1209: Bring back Observable.transform and Transformer alias
  • #1198: Fix flatMapIterable calling recursively itself
  • #1213: Propagate Local isolation in runToFuture
  • #1217: Fix performance regression in bufferSliding
  • #1244: Add support for compression: Gzip and deflate
  • #1262: Fix bug in Task.runSyncUnsafe related to ContextSwitch
  • #1265: Implement Observable#bufferWhile and bufferWhileInclusive
  • #1267: Implement Asynchronous Stack Traces for Task
  • #1276: Add Task/Coeval convenience methods like .when
  • #1282: Add 'as' in Task and Coeval
  • #1284: Add left/right builders for Task and Coeval
  • #1286: Add none/some builders for Task and Coeval
  • #1291: tapEval, tapError methods at Task and Coeval
  • #1293: removing no-op onComplete() in Observable.takeByTimespan
  • #1299: Fix a bug in Local.value
  • #1307: Observable.fromIteratorBuffered

People who made this release possible

  • Adrian (@adrian-salajan)
  • Alexandru Nedelcu (@alexelcu)
  • ctoomey (@ctoomey)
  • Dmitro Pochapsky (@pchpsky)
  • Georgy Khotyan (@GKhotyan)
  • James Yoo (@jyoo980)
  • Kasper Kondzielski (@ghostbuster91)
  • Pau Alarcón (@paualarco)
  • Piotr Gawryś (@Avasil)
  • Sandeep Kota (@sandeepkota)
  • tafit3 (@tafit3)
  • Vladyslav (@VladPodilnyk)

Version 3.2.2 (June 4, 2020)

The release is binary and source compatible with 3.x.x line. It is released for the following Scala and ScalaJS versions:

  • Scala 2.11: ScalaJS 0.6.x
  • Scala 2.12: ScalaJS 0.6.x and 1.0.x
  • Scala 2.13: ScalaJS 0.6.x and 1.0.x

Relevant updates:

  • #1197: Fixes a memory leak in bracket, introduced in 3.2.0
  • #1195: Fixes non-deterministic behavior in Observable.zip of sources different size
  • #1190: Now Observable.groupBy correctly signals error as a failed stream instead of normal completion
  • #1188: Fixes an issue in ForeachAsyncConsumer where it wasn't properly propagaing errors in some cases
  • #1187: Fixes an issue where Observable.doAfterSubscribe was not executing its finalizer
  • #1186: Observable.interval method now schedules the first tick asynchronously
  • #1184: Huge performance improvement in CharsReader, InputStream and LinesReaderObservable
  • #1154: Observable.fromInputStream and fromCharsReader now respects the chunkSize
  • #1181: Fix MatchError in Iterant.fromReactivePublisher

People who made this release possible:

  • Akosh Farkash (@aakoshh)
  • Alexander (@ppressives)
  • fnqista (@fnqista)
  • Kasper Kondzielski (@ghostbuster91)
  • Pau Alarcón (@paualarco)
  • Piotr Gawryś (@Avasil)
  • Vasily Kirichenko (@vasily-kirichenko)
  • Viktor Lövgren (@vlovgr)

Version 3.2.1 (April 30, 2020)

Bug fix release, fixing a critical issue with ScalaJS 1.0.x #1666 and a corner case with Bracket #1175

Version 3.2.0 (April 26, 2020)

The release is binary and source compatible with 3.x.x line. It is released for the following Scala and ScalaJS versions:

  • Scala 2.11: ScalaJS 0.6.x
  • Scala 2.12: ScalaJS 0.6.x and 1.0.x
  • Scala 2.13: ScalaJS 0.6.x and 1.0.x

Relevant updates:

  • #1087: Bracket should not evaluate "use" if Task was canceled during "acquire"
  • #1098: Allow to pass Long in Observable.drop(n)
  • #1101: Canceled tasks in Half-Open state should return to Open state in CircuitBreaker
  • #1107: Add CommutativeApplicative[Task.Par] instance
  • #1106 and #1125: Add Observable.concatMapIterable
  • #1117: SyncEffect instance for Coeval
  • #1120: Cancel should always wait for the finalizer
  • #1126: bufferIntrospective should signal Stop upstream when it is back-pressured
  • #1135: Observable.intervalAtFixedRate under-millisecond interval fix
  • #1132: Add Iterant.withFilter
  • #1129: Add Observable.withFilter
  • #1145: Deprecate gather, gatherN, gatherUnordered in favor of parSequence, parSequenceN, parSequenceUnordered
  • #1152: Add Consumer.toList

People that made this release possible:

  • Allan Timothy Leong (@allantl)
  • Eugene Platonov (@jozic)
  • Fabien Chaillou (@fchaillou)
  • Gabriel Claramunt (@gclaramunt)
  • Mantas Indrašius (@mantasindrasius)
  • TapanVaishnav (@TapanVaishnav)
  • najder-k (@najder-k)
  • Oleg Pyzhcov (@oleg-py)
  • Pau Alarcón (@paualarco)
  • Piotr Gawryś (@Avasil)
  • Ross A. Baker (@rossabaker)
  • Viet Yen Nguyen (@nguyenvietyen)
  • Viktor Dychko (@dychko)

Version 3.1.0 (November 8, 2019)

The release is binary and source compatible with 3.0.0.

Important updates:

  • #1008: Fixed stack safety issue of Observable.combineLatestList for big lists
  • #1010: flatMapLoop for Task and Coeval
  • #1012: ConcurrentQueue.isEmpty
  • #1014: Observable.timeoutOnSlowDownstreamTo
  • #1016: Observable.takeUntilEval
  • #1057: Fix default scheduleOnce implementation
  • #1062: Solves a memory leak which sometimes occurred when using Task with localContextPropagation and non-TracingScheduler
  • #1063: Ensure async boundary in TaskCreate if LCP is enabled
  • #1064 and #1070: Earlier cancelation in Observable.mapParallel if any task fails
  • #1065: Add mapAccumulate to Observable

People that made this release possible:

  • Alexandru Nedelcu (@alexandru)
  • Allan Timothy Leong (@allantl)
  • fdilg (@fdilg)
  • Jan Bracker (@jbracker)
  • Moritz Bust (@busti)
  • mudsam (@mudsam)
  • Oleg Pyzhcov (@oleg-py)
  • Paweł Kiersznowski (@pk044)
  • Piotr Gawryś (@Avasil)
  • tanaka takaya (@takayahilton)
  • TapanVaishnav (@TapanVaishnav)

Version 3.0.0 (September 11, 2019)

Important updates:

  • #875 and #1022: Update to Cats and Cats-Effect 2.0.0
  • #1018: Update Minitest to 2.7.0

Chores:

  • #996: improve Observable.publishSelector scaladoc
  • #1017: disable Scalafmt checks in build
  • #1006: Update sbt to 1.3.0
  • #1013: Update sbt-sonatype to 3.6

People that made this release possible:

  • Alexandru Nedelcu (@alexandru)
  • Oleg Pyzhcov (@oleg-py)
  • Piotr Gawryś (@Avasil)
  • The Cats and Cats-Effect contributors that worked on and released 2.0.0

Version 3.0.0-RC5 (August 29, 2019)

Bug fix release:

  • #991 (PR #993): NullPointerException in Task when used in combination with Local
  • #992 (PR #998): hide InterceptableRunnable exposed accidentally, refactor it for efficiency
  • #997: bumped Scala version to 2.12.9 and Scala.js to 0.6.28

This release is binary compatible with 3.0.0-RC4.

Version 3.0.0-RC4 (August 25, 2019)

Last release before 3.0.0 which will be released as soon as Cats-Effect 2.0.0 is available. At the time of writing release notes, it is only waiting on Cats 2.0.0 which is about to release next RC which will become stable version if no critical issues are discovered.

Any other development for this release is now frozen except if we discover critical bugs like memory leaks. All other changes will target 3.1.0.

3.0.0 will be binary and source compatible with 3.0.0-RC4 for Scala 2.12. Monix itself will be also binary compatible for 2.11 but it will have a dependency on Cats-Effect which is not. See Cats-Effect release notes for more details.

We wish we could release 3.0.0 already but if we released now, we would have to release 4.0.0 for Cats-Effect 2.0 because of 2.11 incompatibility there so we decided to hold on. It was a rough road but currently we have multiple active maintainers that can do releases going forward, instead of just Alex so we hope it can give you a confidence for the future! :) Note that Cats-Effect 2.0 is very small release and mostly targeted at support for Scala 2.13 and bug fixes - the upgrade should be limited to bumping version without changing a single line of code.

This release depends on Cats-Effect 1.4.0 and Cats 1.6.1

This release is binary compatible with 3.0.0-RC3 on Scala 2.12. On Scala 2.11 there is an incompatibility caused by introduction of Scheduler.features:

exclude[ReversedMissingMethodProblem]("monix.execution.Scheduler.features")

Main changes

Local

There are several fixes related to Local usage.

  • Using TracingScheduler will also automatically enable local context propagation in Task so running it with runToFutureOpt or setting env variable is no longer a necessity.
  • Local.isolate has a overload for isolating Future which is safer than regular Local.isolate.

The Local model since 3.0.0-RC3 shares by default. To isolate modifications of Local by other concurrently running Future, you have to call Local.isolate.

In case of Task, there is a TaskLocal.isolate version. It is automatically called whenever you run Task so if your use case is setting correlationId or similar, it probably won't require any explicit isolation because your HTTP library will most likely run the Task per request.

Task Builders

There are two major improvements:

  • Now all Task builders (Task.create, Task.async, Task.fromFuture etc.) will return a Task that continues on default Scheduler which is the one supplied during execution unless overriden by executeOn.
  • Callback in Task.create is now thread-safe against contract violation (calling it more than once) so does not require synchronization on the user side.

Sub-project: monix-execution

  • PR #946: Expose less implementation details in Local

  • PR #948: Make Task.memoize play well with Local

  • PR #953: Make default scheduler remove cancelled tasks

  • PR #960: Scheduler.features

  • PR #971: Callback tryOnSuccess/tryOnFailure

  • PR #973: Fix Local.isolate corner case

  • PR #977: Use type classes instead of overloads in Local.isolate/bind

Sub-project: monix-eval

  • PR #913: Optimize Task.guarantee

  • PR #921 & PR #917: Callbacks in Task.create are now thread-safe and always return to the main Scheduler.

  • PR #933: Adds >> syntax to Task

  • PR #935: Adds >> syntax to Coeval

  • PR #934: Implement doOnFinish in terms of guaranteeCase

  • PR #951: Add void to Task + Coeval

  • PR #952: Implement ContextShift.evalOn in terms of Task.executeOn

  • PR #954: Add gatherN + wanderN

  • PR #972: Rename Task.forkAndForget to Task.startAndForget

Sub-project: monix-reactive

  • PR #906: Fix race in MapParallelOrderedObservable

  • PR #918: switchMap should wait for last child to complete

  • PR #919: propagate cancellation to tasks in async Consumers

  • PR #932: Remove try-catch for EvalOnceObservable implementation

  • PR #941: Added some polymorphic methods for Observable

  • PR #945: Add collectWhile observable

  • PR #958: Add Observable.throttle

  • PR #963: Added fromAsyncStateActionF

  • PR #970: Observable.unfold

  • PR #989: Observable.unfoldEval and Observable.unfoldEvalF

Sub-project: monix-tail

  • PR #965: fixes resource handling in Iterant.repeat, adds Iterant.retryIfEmpty

Chores

Thanks

People that made this release possible, in alphabetical order:

  • Alexandru Nedelcu (@alexandru)
  • Allan Timothy Leong (@allantl)
  • BambooTuna (@BambooTuna)
  • Carlo (@entangled90)
  • Oleg Pyzhcov (@oleg-py)
  • Paul K (@pk044)
  • Piotr Gawryś (@Avasil)
  • Rahil Bohra (@rahilb)
  • Richard Tarczaly (@arlequin-nyc)
  • Ryo Fukumuro (@rfkm)
  • TapanVaishnav (@TapanVaishnav)
  • Valentin Willscher (@valenterry)

Version 3.0.0-RC3 (June 16, 2019)

This release depends on Cats-Effect 1.3.1 and Cats 1.6.1.

The next planned release will target Cats-Effect 2.0.0 with Scala 2.13 support.

NOTE: this release IS NOT binary compatible with 3.0.0-RC2, as it contains some API changes, but it should be source compatible (with @deprecated symbols where the case).

Sub-project: monix-execution

This sub-project no longer depends on cats-effect and there are various improvement to Local aimed at fixing interop with Future. Note that you might have to call Local.isolate to disable any sharing between tasks.

  • PR #775: Simplified FutureUtils materialize & dematerialize

  • PR #790: improve fixed rate scheduling on JS

  • PR #803: Eagerly null out dequeued elements in ChunkedArrayQueue

  • PR #822: remove dependency on cats-effect from monix-execution

  • PR #773: change Cancelable.empty type to Cancelable

  • PR #887: Shared locals with binds

  • PR #888: Fix uncaught exception reporting for Scheduler

Sub-project: monix-catnap

  • PR #778: Adds ConcurrentChannel

  • PR #784: More concurrent tests for MVar/Semaphore

  • PR #865: Adding FunctionK values for Task, Coeval

Sub-project: monix-eval

  • PR #802: encapsulate local ctx on task execution

  • PR #807: Improve encapsulation test, encapsulate locals on ContextShift

  • PR #838: Add taskified variants of timeout combinators

  • PR #839: TaskLocal should propagate when used with Bracket Methods

  • PR #849: Specify exception on timeout

  • PR #887: Shared locals with binds

  • PR #865: Adding FunctionK values for Task, Coeval

Sub-project: monix-reactive

  • PR #759: Add Contravariant Observer and Subscriber

  • PR #760: add Observable.filterEval

  • PR #774: Add FunctorFilter instances for Iterant&Observable

  • PR #779: fork blocking i/o observable ops

  • PR #794: Acquire lock per subscription instead of observable-wide lock

  • PR #801: Observable buffers refactoring

  • PR #819: Extend ObservableLike with filterNot method

  • PR #831: SerializableSuite to no longer test Future for serializability

  • PR #834: Observable.reduce should emit for single item source

  • PR #846: Ensure mapParallelOrdered runs in parallel

  • PR #872: Add observable take while inclusive

  • PR #895: Fix memory leak in MapParalle 10BC8 lOrderedObservable

Sub-project: monix-tail

  • PR #778: Adds Iterant.channel, Iterant#consume

  • PR #826: add Iterant.uncons operation

Chores

  • PR #766: Update sbt-unidoc to 0.4.2

  • PR #766: Update sbt-pgp to 1.1.2

  • PR #768: Update sbt-mima-plugin to 0.3.0

  • PR #769: Update sbt-git to 1.0.0

  • PR #770: Update jctools-core to 2.1.2

  • PR #771: Update kind-projector to 0.9.8

  • PR #772: Update sbt-jmh to 0.3.4

  • PR #771: Update kind-projector to 0.9.9

  • PR #783: Use globally accessible (rather than local) source paths in JS source maps (#781)

  • PR #785: Update sbt-scalajs, scalajs-compiler, scalajs-library... to 0.6.26

  • PR #788: Update cats-effect, cats-effect-laws to 1.1.0

  • PR #796: fix scalacOptions

  • PR #797: Scala 2.12.8

  • PR #798: Update intervalWithFixedDelay scaladoc

  • PR #805: Rename keysBuffer to os in groupBy's parameters

  • PR #808: Update Copyright to 2019

  • PR #810: sbt 1.2.8 (was 1.1.0)

  • PR #812: Update Minitest to 2.3.2

  • PR #813: Disable code coverage

  • PR #818: Update Cats-Effect to 1.2.0

  • PR #820: Update cats-laws to 1.5.0

  • PR #821: Update cats-laws to 1.6.0

  • PR #823: Scala 2.13 support

  • PR #821: Update sbt-header to 5.1.0

  • PR #827: Remove comments from .jvmopts

  • PR #833: Fix build for 2.13.0-M5 by deactivating Mima for it

  • PR #840: Add adopters list seed

  • PR #842: Fixed deprecation docs for Task#coeval

  • PR #843: Remove dead code from tests

  • PR #844: Update sbt-header to 5.2.0

  • PR #847: Update ExecutionModel.scala

  • PR #850: Increase rate in AsyncSchedulerSuite

  • PR #854: fix apparently erronous code involving Unit companion

  • PR #855: Update sbt-jmh to 0.3.5

  • PR #857: Make benchmarks compile

  • PR #859: Update sbt-scalajs, scalajs-compiler to 0.6.27

  • PR #867: Update kind-projector to 0.10.0

  • PR #869: fix compile errors with latest Scala 2.13

  • PR #874: Update cats-effect, cats-effect-laws to 1.3.0

  • PR #878: Compile Benchmarks in CI

  • PR #879: Do on subscription cancel scaladoc fix

  • PR #889: Update cats-effect, cats-effect-laws to 1.3.1

  • PR #894: Add UnsafeBecauseImpure Annotation to foreach.

  • PR #896: Update cats-laws to 1.6.1

  • PR #898: Reformating via Scalafmt

  • PR #899: Fix autoCancelableRunLoops comment.

  • PR #901: avoid deprecated unicode arrow chars

  • PR #902: reformat build files

Thanks

People that made this release possible, in alphabetical order:

  • Alexandru Nedelcu (@alexandru)
  • Allan Timothy Leong (@allantl)
  • Daniel Neades (@djneades)
  • Dawid Dworak (@ddworak)
  • Eugene Platonov (@jozic)
  • Itamar Ravid (@iravid)
  • Jorge (@jvican)
  • Jorge Branco (@jorgedfbranco)
  • Kenji Yoshida (@xuwei-k)
  • Luke Stephenson (@lukestephenson)
  • Matthew de Detrich (@mdedetrich)
  • Mikhail Chugunkov (@poslegm)
  • Oleg Pyzhcov (@oleg-py)
  • Ota Hauptmann (@Otah)
  • Piotr Gawryś (@Avasil)
  • Roman Tkalenko (@tkroman)
  • Ryo Fukumuro (@rfkm)
  • Sam Guymer (@guymers)
  • Seth Tisue (@SethTisue)
  • Tanaka Takaya (@takayahilton)
  • Yann Simon (@yanns)

And special thanks to our top contributor in this release: https://github.com/fthomas/scala-steward :)

Version 3.0.0-RC2 (Nov 6, 2018)

Cats-Effect Updates

Supporting Cats-Effect 1.0.0 has been a massive amount of work:

  • PR #659 Cats Effect 1.0.0-RC update
  • PR #681: Cats-Effect 1.0.0-RC2 update
  • PR #686: Cats-Effect 1.0.0-RC3 update, Task conversions
  • PR #716: Updates to Cats-Effect 1.0.0

Also related, but mentioned below:

  • Iterant's encoding had to change due to the new contract of Cats-Effect's type classes, in a massive change of internals that also improved its performance and safety (#683)

Sub-project: monix-execution

Several features, deprecations and refactorings happened in monix-execution, mentioned under the changes for monix-catnap below:

  • monix.execution.misc.AsyncVar was refactored, to have an interface in line with the MVar in Cats-Effect and moved to monix.execution.AsyncVar (#753)
  • monix.execution.misc.AsyncSemaphore was also refactored and enhanced, with an interface resembling that of Cats-Effect's Semaphore and moved to monix.execution.Semaphore (#754)
  • monix.execution.AsyncQueue was added (#757)
  • monix.execution.Callback was added (#740)
  • monix.execution.FutureUtils and CancelableFuture can now take care of the conversions of Scala's Future to and from Java's CompletableFuture (#761)

Other features:

  • PR #675: Switches to stdlib NonFatal
  • PR #738: Adds CancelablePromise
  • PR #765: Changes TrampolineScheduler's internal stack back to a queue

Sub-project: monix-catnap

This is a new project introduced that currently depends on only monix-execution and Cats/Cats-Effect and whose purpose is to provide abstractions built on top of Cats-Effect's type classes.

  • PR #744: Adds monix.catnap.CircuitBreaker and LiftFuture
  • PR #753: Adds generic monix.catnap.MVar and monix.execution.AsyncVar refactoring
  • PR #756: Makes MVar fork on async take for fairness
  • PR #754: Adds generic monix.catnap.Semaphore and monix.execution.AsyncSemaphore refactoring
  • PR #757: Adds monix.execution.AsyncQueue and monix.catnap.ConcurrentQueue
  • PR #762: Fixes issue typelevel/cats-effect#403, also added monix.catnap.cancelables.SingleAssignCancelableF

Also mentioned below, as part of other features:

  • Added monix.catnap.CancelableF and monix.catnap.cancelables.BooleanCancelableF (#726)

Note: the new FutureLift type class provides some of the functionality of the now deprecated monix-java8.

Sub-project: monix-eval

Major removals (with deprecation symbols kept around):

  • monix.eval.TaskSemaphore, replaced by the generic monix.catnap.Semaphore
  • monix.eval.MVar, replaced by the generic monix.catnap.MVar
  • monix.eval.TaskCircuitBreaker, replaced by the generic monix.catnap.CircuitBreaker

This was done because having these implementations specialized for Task doesn't make sense and the new implementations are better and have more features.

Features:

  • PR #626: Adds forever for Task
  • PR #636: Adds join to the fork documentation
  • PR #639: Makes Coeval.value empty-parens to indicate side effects
  • PR #638: Fixes Task.foreach waiting / error reporting
  • PR #634: Adds ability to specify custom options on Effect[Task]
  • PR #655: Handles InterruptedException in NonFatal
  • PR #660: Makes TaskApp scheduler and options defs
  • PR #664: Fixes Task.map2 not executing things in sequence
  • PR #661: Makes mapBoth always execute tasks in parallel
  • PR #669 Adds uncancelable to example
  • PR #647: Changes internal encoding for Task.Async (major!)
  • PR #670: Task gets smarter about forking and async boundaries
  • PR #652: Uses TaskLocal#local in TaskLocal#bindL and TaskLocal#bindClear
  • PR #679: Fixes Task.bracket, onCancelRaiseError; introduce Task.ContextSwitch
  • PR #706: Adds SemigroupK[Task] instance
  • PR #715: Implements Task timed method
  • PR #724: Makes Task auto-cancelable by defaul (major!)
  • PR #725: Adds runtime check to TaskLocal to make it safer
  • PR #726: Changes Task to sequence (back-pressure) async finalizers (major!)
  • PR #732: Adds guarantee and guaranteeCase methods on Task and Coeval
  • PR #740: Moves Callback to monix.execution, Task runAsync refactor, rename to runToFuture (major!)
  • PR #761: Expands FutureLift to take care of CompletableFuture

Sub-project: monix-reactive

Observable suffered an API refactoring, changing the convention for operators that take Task or F[_] : Effect values as arguments:

  • operators using Task now use the Eval suffix instead of Task, or no special suffix at all
  • operators using F[_] : Sync parameters use an F suffix
  • the F suffixed operators previously signalled operators that kept the Observable context (e.g. findF), however all of them have been renamed

See PR #729 for details.

Features:

  • PR #610: Adds scan0, flatScan0, flatScan0DelayErrors, scanEval0, scanMap0 on Observable
  • PR #641: Reference bufferTumbling instead of buffer in scaladoc
  • PR #646: Fixes ack.future called when Ack is null
  • PR #657: Adds a few missing tests to Observable methods
  • PR #684: Simplifies logic in TakeLastOperator.onNext
  • PR #704: Introduces Observable.doOnStartTask and Observable.doOnStartEval
  • PR #723: Adds Alternative instance for Observable
  • PR #654: Makes Observable#++'s argument lazy
  • PR #729: Adds Observable.bracket, Iterant/Task API refactorings, fixes (major!)
  • PR #741: Adds cats Profunctor instance for Subject
  • PR #739: Adds operator bufferTimedWithPressure with sizeOf on Observable
  • PR #743: Improvs Observable.collect to avoid double evaluation
  • PR #749: Adds Profunctor and Contravariant instance for Consumer
  • PR #750: Fixes handling start/end of Long range in RangeObservable
  • PR #558: Adds Observable.mapParallelOrdered

Sub-project: monix-tail

The Iterant encoding suffered a major change, with all operators described for Iterant being changed for it. This was done because:

  1. the old encoding couldn't be supported under the auto-cancelable model promoted by Cats-Effect 1.0.0
  2. the new encoding is safer and has better performance too

Features:

  • PR #683: Iterant, version 2 (major)
  • PR #614: Adds scan0, scanEval0, scanMap0 on Iterant
  • PR #622: Adds mapBatch for Iterant
  • PR #629: Fixes IterantBuildersSync methods to not require implicit F: Sync[F]
  • PR #631: Renames toGenerator to toBatch in Cursor
  • PR #633: Fixes eagerness of .bracket on Last nodes
  • PR #621: Changes behavior of Batch#fromArray, fromAnyArray
  • PR #656: Makes Iterant's ++ take a lazy (by-name) parameter
  • PR #662: Adds Iterant.fromReactivePublisher
  • PR #709: Removes unused function from EvalOnNextAck
  • PR #707: Add Iterant.lastOptionL
  • PR #746: Fix Iterant.fromReactivePublisher
  • PR #755: Remove the Sync[Iterant] instance

Sub-project deprecation: monix-java8

The functionality in monix-java8 was implemented directly in:

  1. monix.execution.FutureUtils
  2. monix.execution.CancelableFuture
  3. monix.catnap.FutureLift

The monix-java8 sub-project is still provided, but is deprecated and will soon be removed.

Chores

  • PR #653: Update Monix's rootdoc, the landing page for the ScalaDoc
  • PR #671: Optionally allow forcing a build on Java 9+
  • PR #677: Add Starting Point section to CONTRIBUTING.md
  • PR #693: Fix micro doc typo in monix.execution.misc.InlineMacros
  • PR #699: Add Concat and Scope to Iterant's description
  • PR #640: Add sbt-doctest, to verify code examples in ScalaDoc
  • PR #705: Fix all ScalaDocs (except Task's) in monix.eval
  • PR #717: Change to Scala's Code of Conduct
  • PR #720: Add @Avasil to the Code of Conduct
  • PR #718: Fix Task ScalaDocs
  • PR #736: Update doctest plugin version
  • PR #763: Fix Observable doc mentioning cats.Eq

Thanks

People that made this release possible, in alphabetical order:

  • Alexandru Nedelcu (@alexandru)
  • Eduardo Barrientos (@kdoomsday)
  • Eugene Platonov (@jozic)
  • Jakub Kozłowski (@kubukoz)
  • Jamie Wilson (@jfwilson)
  • Joe Ferris (@jferris)
  • Jules Ivanic (@guizmaii)
  • Kacper Gunia (@cakper)
  • Kamil Kloch (@kamilkloch)
  • Loránd Szakács (@lorandszakacs)
  • Oleg Pyzhcov (@oleg-py)
  • Piotr Gawryś (@Avasil)
  • Raas A (@RaasAhsan)
  • Seth Tisue (@SethTisue)
  • Yohann B (@ybr)
  • jendakol (@jendakol)
  • volth (@volth)

Version 3.0.0-RC1 (May 18, 2018)

[https://typelevel.org/cats-effect/ Cats Effect] integration:

  • PR #598: Integrates cats.effect.Timer and IO.cancelable
  • PR #600: Add Sync & Async instances for Iterant
  • PR #607: implement ConcurrentEffect[Task] (upgrade to cats-effect 0.10)
  • PR #609: update Cats to 1.1.0 & Cats Effect to 0.10

Features for monix-execution:

  • PR #527 (#517, #525 and #526): removes macros, replacing them with plain extension methods, removes SerialCancelable#orderedUpdate
  • PR #556: SchedulerService.awaitTermination and fix concurrency tests
  • PR #584 (#221): add conversions module for the Java 8 CompletableFuture

Features for monix-eval:

  • PR #507: add onErrorRestartLoop for Task and Coeval
  • PR #533 (#523): add Task.fork operator, deprecate old Task.fork and executeWithFork, renamed to executeAsync
  • PR #530 (#520): add Task.forkAndForget
  • PR #537 (#535): Make MVar constructors return Task
  • PR #540 (#539): make all Task abstractions referentially transparent
  • PR #545 (#538): add newtype for Task.Par, using same encoding used in cats-effect
  • PR #547 (#542): add Task.runSyncUnsafe
  • PR #550: add Task.sleep, refactor the implementation of delayExecution and delayResult and deprecate delayExecutionWith and delayResultBySelector
  • PR #482 (#477): add the .cancelable operator on Task
  • PR #561: Bracket for Task / Coeval, Task.cancelable and Task.onCancelRaiseError
  • PR #596: add Fiber interface, refactor memoize for Task and Coeval
  • PR #602: TaskLocal should expose Local
  • PR #603: Changed implementation TaskLocal#bind in terms of Task#bracket

Features for monix-reactive:

  • PR #511 (#269): add monix.reactive.subjects.Var type
  • PR #528: add Observable.scanMap operator
  • PR #536 (#459): add a NonEmptyParallel for Observable using combineLatest

Features for monix-tail:

  • PR #503 (#487): add Iterant.liftF builder for lifting monadic values
  • PR #510 (#500): add Iterant.takeEveryNth operator
  • PR #504 (#499): add Iterant.switchIfEmpty operator
  • PR #509 (#495): add Iterant.dropLast operator
  • PR #508 (#501): add Iterant.intersperse operator
  • PR #512 (#496): add Iterant.dropWhileWithIndex operator
  • PR #514 (#497): add Iterant.takeWhileWithIndex operator
  • PR #523 (#519): add Iterant.scanMap operator
  • PR #518 (#516): add Iterant[Task].intervalAtFixedRate
  • PR #524 (#498): add Iterant.interleave
  • PR #549 (#548): add Iterant.fromStateAction and fromStateActionL
  • PR #567 (related to #563): completedL should handle F[_] errors, mapEval should not
  • PR #569 (related to #563): Iterant fold left operators (yielding F[_]) need to handle errors thrown in F[_]
  • PR #566 (#562): improve safety of attempt & onErrorHandleWith on Iterant
  • PR #578 (#570): add Iterant#sumL method
  • PR #579 (#577): make Iterant#reduceL and headOptionL left folds handle errors from F[_] context
  • PR #575 (##571 and #572): add Iterant.repeat (method and builder)
  • PR #583 (#549): add Iterant.fromStateAction builder
  • PR #582 (#573 and #574): add repeatEval/repeatEvalF for Iterant & repeatEvalF for Observable
  • PR #554 (#479): add Iterant#bracket operator
  • PR #581 (#559): handle broken nodes in Iterant.skipSuspendL
  • PR #589: improve handling of broken batches/cursors in Iterant.attempt
  • PR #591 (#580): improve strictness of Eq of Iterant, fix doOnFinish on Last

Bug fixes:

  • PR #552 (#483): MVar is stack unsafe, triggering stack overflow on put
  • PR #543 (#541): Observable.take(0) shouldn't subscribe to the source at all
  • PR #496 (#468): race condition for Observable in concatenation operators
  • PR #568: in Iterant.toReactivePublisher the cancel should be made by request()
  • PR #592 (#590): potential nontermination in Observable.zip[Map]

Chores:

  • PR #502: update sbt to 1.1
  • PR #488: add note about execution model for Observable.fromInputStream
  • PR #531 (related to #513): add automatic header creation on compilation
  • PR #557: disable automatic publishing, too dangerous
  • PR #546 (related to #513): add scalafmt.conf configuration
  • PR #565: correct small typo in doc of Task#executeOn
  • PR #576: fix comment mentioning A 10BC8 kka instead of Monix
  • PR #588: update copyright headers for Scala 2.11 source files
  • PR #605: Make concurrent Atomic tests more resilient to timeouts

Version 2.3.3 (Jan 21, 2018)

Release is binary backwards compatible with series 2.3.x.

Bug fixes:

  • Issue #468: Observables created using concat don't get canceled (critical)
  • Issue #483: stack overflow error on MVar.put
  • Issue #541: observable.take(0) shouldn't subscribe to the source at all
  • Issue #475: Observable.fromAsyncStateAction does not protect against exceptions thrown in use code

Issue #468 in particular is pretty serious as it can lead to resource leaks. Read the pull request for more details.

Upgrade to 2.3.3 is recommended!

Version 3.0.0-M3 (Jan 7, 2017)

Final milestone release before the RC and the final and stable 3.0.0.

Special thanks to Leandro Bolivar for implementing propagation of "local vars" (aka Local and TaskLocal, the equivalents of ThreadLocal, but for usage with Future and Task).

This release also lands a long awaited feature for Task: pure cancellation, aka Task.cancel. It's building on top of the current Task implementation, however it changes the API — e.g. in order to keep Task pure, the chooseFirstOf operator is now gone, being replaced with an equivalent racePair that operates with tasks and pure functions.

The other highlight of the release are the performance improvements for Task, an on-going process to make sure that Monix's Task remains the best implementation in Scala's ecosystem.

We now depend on Cats 1.0.1 and cats-effect 0.8.

Full list of PRs:

  • PR #464: updates dependencies, Scala to 2.12.4 and 2.11.12, JCTools to 2.1.1, Minitest to 2.0.0, Scala.js to 0.6.21
  • PR #462: Fix for timeoutTo to cancel source task directly after timeout
  • PR #444: Add localContextPropagation to Task.Options, implement tracing Local vars
  • PR 470: increase test coverage
  • PR #473: Fix issue where fromAsyncStateAction is not safe for user code
  • PR #485 and PR #489: Updates Cats to 1.0.1 and cats-effect to 0.8
  • PR #474: Task / Coeval Run-loop Optimizations, First Batch
  • PR #492: Second batch of optimizations
  • PR #494: Task.cancel as a pure action, along with .start, .race and .uncancelable

Version 3.0.0-M2 (Nov 9, 2017)

The highlight of this release is the upgrade to Cats 1.0-RC1, bringing a cats.Parallel[Task, Task] instance that replaces the need for Task.nondeterminism, now removed.

List of changes:

  • PR #437: Added Iterant.zipWithIndex
  • PR #439: Added Iterant.dump
  • PR #441: Observable.mapParallelUnordered needs configurable overflow strategy
  • PR #445: Added ShiftedRunnable in monix.execution
  • PR #443: Iterant maxByL and minByL ops
  • PR #442: small fixes in takeWhileNotCanceled and runAsyncGetFirst docs
  • PR #450: Minor test description fix
  • PR #458: Updates to cats 1.0-RC1 and cats-effect 0.5, along with redesigning that integration, e.g. added cats.Parallel instance, Iterant.parZip and Iterant.parZipMap

Version 3.0.0-M1 (Sep 15, 2017)

This is a major release that breaks both binary and source compatibility. The major themes of this release:

  1. deep integration with Typelevel Cats
  2. the Iterant data type in a new monix-tail sub-project
  3. API refactoring, eliminated deprecations
  4. major improvements to Observable, Task and CancelableFuture

Typelevel Cats integration:

  • PR #370: introduced Cats and cats-effect as direct dependencies
  • PR #377: added Cats related conversions, along with naming changes for consistency (e.g. renamed Coeval.Attempt to Coeval.Eager)
  • PR #387: updated Cats to 1.0.0-MF, removed deprecated functions and classes
  • PR #397: standardizes on Cats-related naming, removes Coeval's Comonad implementation
  • PR #398: re-adds instances for CoflatMap
  • PR #427: adds conversions from Cats to Observable

New monix-tail sub-project, exposing monix.tail.Iterant[F[_], A]:

  • PR #280: introduces Iterant[F[_], A] for pull-based streaming based on Task / Coeval
  • PR #396: adds the Iterant.scan operator
  • PR #403: adds Iterant.foldWhileLeftL and Iterant.foldWhileLeftEvalL operators
  • PR #404: adds Iterant existsL, forallL, changes Observable.foldWhileL (breaking change)
  • PR #402: adds Iterant.foldRightL operator
  • PR #405: adds Iterant ops - findL, foldL, maxL, minL, reduceL
  • PR #407: adds Iterant ops - countL, distinctUntilChanged, distinctUntilChangedByKey
  • PR #412: adds scanEval on both Iterant and Observable
  • PR #411: another naming consistency change between Observable and Iterant
  • PR #413: Iterant.bufferSliding, bufferTumbling and batched operators
  • PR #417 and PR #418: Reactive Streams implementation for Iterant

Improvements for monix-execution and CancelableFuture:

  • PR #390: changes for flatMap on CancelableFuture to cancel all involved futures (thanks to @larsrh)
  • PR #395: adds Cats type class implementations for CancelableFuture
  • PR #431: improvements to CancelableFuture to get rid of memory leak, also adding utils like CancelableFuture.async
  • PR #432: further fixes to CancelableFuture, since describing a cancellable flatMap is a hard problem
  • PR #418: adds flip convenience method to AtomicBoolean (thanks to @Wogan)

Improvements for monix-reactive and Observable:

  • PR #391: makes Observable concatenation (++) stack safe
  • PR #408: changes for Iterant and Cats consistency (make use of Eq and Order type classes, add foldF and foldL, remove distinct and distinctByKey)
  • PR #368: added the Observable.intersperse operator (thanks to @omainegra)
  • PR #384: added contramap method to Callback (thanks to @Wogan)
  • PR #425: gets rid of ObservableLike, makes Observable an abstract class where the operators are final, Pipe no longer has Observable's operators, just transform

Improvements for monix-eval, Task and Coeval:

  • PR #410: Task and Coeval performance optimisations
  • PR #422: adds Task.shift, an innovation inspired by cats.effect.IO
  • PR #424: Task refactoring, gets rid of Task.OnFinish type alias
  • PR #430: Coeval and Task refactoring to the run methods for consistency, introduced map2, map3...map6 on both Task and Coeval, renamed zipMap* to parMap2, parMap3... parMap6 for Task

Administrative and build changes:

Version 2.3.1 (Sep 20, 2017)

Release is binary backwards compatible with series 2.3.x.

This is a service release, fixing a minor issue in AsyncScheduler and upgrading Scala.js:

  • PR #436: adds reusable ShiftedRunnable, leaving no room for error in BatchingScheduler types by usage of TrampolinedRunnable; also upgrades Scala.js to 0.6.20

Version 2.3.1 (Sep 20, 2017)

Release is binary backwards compatible with series 2.3.x.

This is a service release, fixing a minor issue in AsyncScheduler and upgrading Scala.js:

  • PR #436: adds reusable ShiftedRunnable, leaving no room for error in BatchingScheduler types by usage of TrampolinedRunnable; also upgrades Scala.js to 0.6.20

Version 2.3.0 (May 3, 2017)

Release is binary backwards compatible with series 2.2.x.

List of changes:

  • Issue #340: Optimization of TaskSemaphore
  • Issue #349: Replace usage of scala.util.control.NonFatal in handling fatal exceptions to monix.execution.misc.NonFatal
  • Issue #347: Add Task.deferAction builder
  • Issue #339: Add Observable.observeOn method
  • Issue #338: Cancelable refs built with Cancelable.collection should use Cancelable.cancelAll in its implementation
  • Issue #350: Change BackPressure buffer implementation to be more fair and ensure that it doesn't lose events
  • Issue #353: Refactor Coeval / Task run-loop to introduce optimized attempt / materialize implementations and add transform / transformWith methods making use of this
  • Issue #355: Add Coeval.run method
  • Issue #356: Add Coeval#attempt and Task#attempt methods
  • Issue #358: Deprecate materializeAttempt and dematerializeAttempt on Task and Coeval
  • Issue #359: Rename Coeval.Attempt#isFailure to Coeval.Attempt#isError
  • Issue #348: Add Consumer#transformInput method
  • Issue #352 / PR #361: No back-pressure when converting from org.reactivestreams.Publisher to Observable
  • Issue #362: Replace [T] generic param to [A], as a convention, everywhere
  • PR #341, PR #344, PR #346, Commit 9357ba, etc: Update dependencies (Scalaz 7.2.11, Scala 2.11.11, Scala 2.12.2, Scala.js 0.6.16)

Administrative:

  • Issue #354: Enable Mima and Unidoc error reporting in Travis build
  • PR #351: Specify that Monix is now a Typelevel project with full membership

Version 2.2.3 (Mar 10, 2017)

Critical bug fix release related to Scala 2.12:

  • Bug #330: Ack.Continue.transformWith and Ack.Stop.transformWith are not stack-safe

Most (probably all) functionality in Monix is not affected, because Monix rarely flatMaps Continue references and we have had extensive tests for it. However this bug can be dangerous for people that have implemented the communication protocol (as described in the docs) by themselves.

Version 2.2.2 (Feb 22, 2017)

New Features:

  • Issue #306: Circuit Breaker for Task
  • Issue #312: Add Task.memoizeOnSuccess and Coeval.memoizeOnSuccess
  • Issue #313: Add Task.deferFutureAction builder
  • Issue #325: Add SingleAssignmentCancelable.plusOne
  • Issue #319: Move and redesign exceptions in monix.execution
  • Issue #314: Task.sequence should have lazy behavior in evaluating the given sequence

Bug fixes:

  • Bug #268: Optimise the unsubscribe logic in PublishSubject
  • Bug #308: Fix NPE on AsyncSubject.unsubscribe
  • Bug #315: The MapTaskObservable internal object is exposed (ScalaDoc)
  • Bug #321: Observable.concatMap and mapTask cannot be canceled if the source has already completed
  • Documentation fixes: #307, #309, #311, #316 and #317

Build:

  • enabled the Scala Migration Manager (MiMa) in build.sbt to check for backwards compatibility problems
  • Issue #322: Switch projects which use CrossVersion.full/"org.scala-lang" to CrossVersion.patch/scalaOrganization.value

Version 2.2.1 (Jan 27, 2017)

Unfortunately we have to push an emergency fix:

Version 2.2.0 (Jan 25, 2017)

In addition to the changes from the 2.2.0-M1 milestone:

Version 2.2.0-M1 (Jan 4, 2017)

Version 2.2.0-M1 is a milestone release, released for feedback and testing purposes.

  • Issue #281: Fix performance regression in Task.flatMap
  • Issue #284: Move ExecutionModel to monix.execution
  • Issue #285: Rename Task.runAsync(f: Try[A] => Unit) to Task.runOnComplete
  • Issue #286: Add Task.runSyncMaybe
  • Issue #287: Add Scheduler.forkJoin builder
  • Issue #266: Add SchedulerService interface in monix.execution.schedulers
  • Issue #288: Task.create should not force async boundary
  • Issue #289: Observable.foreach should not fork
  • Issue #291: Add Observable.takeEveryNth operator
  • Issue #292: Optimize Observable.concatMap
  • Issue #294: Optimize Observable.bufferSliding
  • Issue #295: Add Observable.publishSelector, Observable.pipeThroughSelector
  • Issue #296: Add Task.deferFuture builder

Version 2.1.2 (Dec 19, 2016)

Version 2.1.2 is a minor release, binary compatible with 2.1.x, upgrading Scala to 2.12.1 and fixing a bug in Observable.bufferSliding.

  • Bug #275: Observable.bufferSliding is broken

Version 2.1.1 (Nov 22, 2016)

Version 2.1.1 is a minor release, binary compatible with 2.1.0, fixing the compatibility with older Android versions.

The gist is that older Android versions are incompatible with our usage of sun.misc.Unsafe. And this might also be true of other platforms as well, like the upcoming Java 9.

Therefore we are doing two things:

  1. we introduce new monix.execution.atomic.Atomic implementations that make use of AtomicFieldUpdater classes, for those platforms that do not support sun.misc.Unsafe; hopefully this will perform well on top of Java 9, see this post by Aleksey Shipilёv: https://shipilev.net/blog/2015/faster-atomic-fu/\
  2. in our usage of JCTools, since these rely heavily on sun.misc.Unsafe, we fallback to implementations from org.jctools.queues.atomic, as these are safe to use

The issues being addressed:

  • Bug #269: Observable throws NoSuchFieldException (via jctools) on Android
  • Issue #270: Add support for platforms that do not have sun.misc.Unsafe (with the corresponding PR #272)

Version 2.1.0 (Nov 9, 2016)

Version 2.1.0 is a major release that is not compatible with the previous 2.0.x series.

Issues addressed:

  • Issue #226: Add Task.Options with an autoCancelableRunLoops property
  • Issue #227: Add executeWithFork, executeWithModel and asyncBoundary operators on Task
  • Issue #232: Async Task instances should execute with TrampolinedRunnable everywhere we can
  • Issue #236: Task and Coeval need foreach and foreachL
  • Issue #237: Introduce monix.execution.misc.ThreadLocal
  • Issue #238: Add Coeval.Attempt.get
  • Issue #239: Task.flatMap loops should not be auto-cancelable by default
  • Issue #240: Change type class encoding, provide optimal Observable.tailRecM, upgrade Cats to 0.8.x
  • Issue #251: Provide instances for Scalaz Catchable
  • Issue #241: TestScheduler's exposed state should return the State and not Atomic[State]
  • Issue #243: Add the TrampolineScheduler for the JVM, in addition to Javascript
  • Issue #256: Refine extension methods on Scheduler
  • Issue #264: AtomicNumber classes need getAndAdd optimisation
  • Issue #262: Add TaskSemaphore and AsyncSemaphore
  • Issue #263: Add Observable.mapTask and Observable.mapFuture
  • Issue #205: Add Observable.mapAsync for parallel mapping over Observable
  • Issue #261: Optimize the performance of the Observable buffers
  • Issue #254 Rename Observable.runWith to Observable.consumeWith
  • Issue #242: Add Scheduler.cached builder for the JVM

Version 2.0.6 (Nov 2, 2016)

  • Upgrade Scala to 2.12.0 final release
  • Upgrade Scalaz to 7.2.7
  • Upgrade Minitest to 0.27

Version 2.0.5 (Oct 23, 2016)

  • Bug #247: Avoid runtime reflection
  • Bug #248: Reset overflow counter on None onOverflow result
  • Updates Scala.js to 0.6.13 and Scala to 2.12.0-RC2

Version 2.0.4 (Oct 10, 2016)

  • Bug #244: AsyncScheduler.scheduleAtFixedRate and scheduleWithFixedDelay (on the JVM) have incorrect behavior

Version 2.0.3 (Oct 3, 2016)

  • Bug #230: Deadlock when blocking threads due to LocalBatchingExecutor (affects Task usage)

Version 2.0.2 (Sat 25, 2016)

  • Issue #224: IllegalStateException logged in parallel consumer, when streaming gets canceled due to a subscriber triggering an error

Version 2.0.1 (Sat 10, 2016)

  • Issue #218: Upgrade Cats to 0.7.2, Scalaz to 7.2.6 and support Scala 2.12.0-RC1

Version 2.0.0 (Aug 31, 2016)

  • Issue #216: Change type class design in monix.types to an encoding inspired by the Scato and Scalaz 8, cleaning up the available types; also enable 2.12.0-M5 support, although releases are not automatic, because Cats doesn't yet support Scala 2.12

Version 2.0-RC13 (Aug 19, 2016)

Emergency bug fix:

  • Issue #215: the instance created by Task.gatherUnordered keeps state and has problems running (with runAsync) a second time

Version 2.0-RC12 (Aug 19, 2016)

Bug fixes:

  • Issue #211: CompositeCancelable.remove wasn't working after the changes in RC10, fixed it in RC11 and now added some more tests
  • Issue #213: Fixes Task / Coeval memoize operation

Enhancements:

  • Issue #212: Upgraded Cats to version 0.7.0
  • PR #214: optimize Task, refactorings, some deprecations (details below)

Details on PR #214:

  • Upgraded the Cats dependency to version 0.7.0. Had some trouble with that (see cats#1329), but it is now functional
  • Renamed eval to evalAlways across the board (in Task, Coeval and Observable), but kept evalAlways with the @deprecated sign, so upgrade should be smooth. The reason is that evalAlways is an often used operation and deserves a shorter name
  • For Scalaz converts introduced Task.delay as an alias of Task.eval, Task.suspend as an alias of Task.defer and Task.async as an alias of Task.create
  • Renamed Task.eval(Coeval) to Task.coeval(Coeval) and Observable.eval(Coeval) to Observable.coeval(Coeval) in order to avoid a conflict
  • Removed Task.both because it is just an alias for Task.mapBoth. Judging in retrospective, we probably should've added it a @deprecated warning instead; on the other hand both and mapBoth are so close that the IDE will probably suggest mapBoth (at least IntelliJ IDEA does)
  • Refactor the Task internals again, for optimizations and simplifications:
    • Simplified the internal states, e.g. instead of having Now, Error, Always and Once, we now have a single Delay(coeval), thus reusing the Coeval type for computing asynchronous values
    • Get rid of the Task.Attempt type, it never made any sense that one. People can use Coeval.Attempt if they need a Try alternative (and convert to Task if they end up needing a Task)
    • Introduced Scheduler.executeAsync and Scheduler.executeLocal as extension methods powered by macros, for zero-overhead, because building Runnable instances is too annoying
    • Used Scheduler.executeLocal and LocalRunnable in key points in the Task implementation to reduce forking
    • Made Task.gather be based on Task.gatherUnordered and it is now way faster
  • Moved everything from monix.types.shims to monix.types

Version 2.0-RC11 (Aug 19, BF85 2016)

Bug fixes:

  • Issue #207: Task flatMap loop isn't cancelable
  • Issue #210: Fixed CompositeCancelable.remove, a bug introduced in the last release (RC10)

Enhancements:

  • Issue #208: Uniquely name threads generated from ThreadFactory
  • Issue #210: Refactorings for performance and coherence reasons, described below

Issue #210 changes for the monix-execution sub-project:

  • introduced the CallbackRunnable interface for marking Runnable instances that could be executed on the current thread, on a local trampoline, as an optimization
  • introduced LocalBatchingExecutor, a mixin for schedulers that can execute CallbackRunnable locally, using a trampoline
  • made AsyncScheduler for the JVM be able to execute CallbackRunnable instances by inheriting from LocalBatchingExecutor; but not on top of Javascript
  • fixed critical bug in CompositeCancelable that was introduced in the last release

Issue #210 changes for the monix-eval sub-project:

  • optimized Task.fromFuture to the point that it has near zero overhead

  • optimized Task.gather, Task.gatherUnordered, Task.sequence

  • Task.gather now forces asynchronous execution for the given tasks

  • Task.gatherUnordered also forces asynchronous execution

  • optimized the Task trampoline in general

  • introduced Callback.async wrapper and asyncApply extension method

  • renamed Task.zipWith to Task.zipMap (rename across the board, also for Observable)

  • added Task.executeOn for overriding the Scheduler

  • added Task.fork overload with a scheduler override

  • added Task.async as an alias of Task.create

Issue #210 changes for the monix-types sub-project:

  • moved all shims to monix.types.shims, in order to differentiate them from type classes that are not shims
  • added the Deferrable type class, to express lazy evaluation concerns (e.g. evalOnce, evalAlways, defer, memoize)
  • added the Evaluable type class, for computations that will eventually produce a value

Issue #210 changes for the monix-reactive project:

  • for foldLeft methods, make the seed be just a normal by-name parameter instead of a Coeval, because otherwise it isn't compatible with other type classes / interfaces
  • affected methods are foldLeft, foldLeftAsync
  • rename zipWith to zipMap
  • rename combineLatestWith to combineLatestMap
  • add Observable.fromAsyncStateAction
  • fix Consumer.foldLeftAsync

Version 2.0-RC10 (Aug 10, 2016)

Enhancements:

  • Issue #200: Add an executeNow extension method for Scheduler, taking a by-name callback, as initializing Runnable instances is too annoying
  • Issue #201: Fixes and optimizes Task.gatherUnordered - as an edge-case, it wasn't stack safe and it has been optimized to be more efficient
  • Issue #202: Added asyncOnSuccess and asyncOnError as extension methods for Callback and made Task.create safe by forcing an asynchronous boundary when calling the callback (onSuccess/onError); also optimizes Task.chooseFirstOfList and TestScheduler
  • Issue #203: Changed the onOverflow function signature for OverflowStrategy types supporting it - it can now return an Option and if it returns None, then we don't signal any messages downstream, thus making it easier to just log that overflow happened without extra tricks

Version 2.0-RC9 (Jul 31, 2016)

Bug fixes:

  • Issue #193: Task Applicative instance doesn't run the tasks in parallel
  • Issue #194: Task.mapBoth is not stack-safe

Enhancements:

  • Issue #196: Add the Consumer.create builder
  • Issue #166: Generalize Task.sequence, Task.gather and Task.gatherUnordered for arbitrary collections

Misc:

  • updated Scala.js version to 0.6.11
  • updated Cats version to 0.6.1
  • changed PGP signing key
  • increased timeout on the reactive streams publisher tests

Version 2.0-RC8 (Jun 29, 2016)

Critical bug fix:

  • BUG #181: the default operators on CancelableFuture are triggering StackOverflow exceptions

New Features:

  • Issue #184: introducing the Consumer type, a factory of subscribers that makes it easier to specify reusable and composable consumers and for example, it makes it possible, out of the box, to load-balance the workload between multiple subscribers in parallel; see the description
  • Issue #186 (related to issue #168): adds the Observable.interleave2 operator, similar with the one in FS2 (former scalaz-streams)
  • Issue #180: the Observer.feed function now has an overload that does not take a cancelable, because it's awkward coming up with one if it isn't needed; there's also a onNextAll extension for both Observer and Subscriber which can push a whole collection of events
  • Issue #187: integrates the MonadCombine type class from Cats, being similar to the Scalaz MonadPlus, as somehow this was missed in the initial integration
  • Issue #177 reviews exposed traits and abstract classes, making sure they inherit from Serializable
  • Issue #85: small change, clarifies the ScalaDoc on the RefCountCancelable type
  • Issue #162: implements the Observable.takeUntil(trigger: Observable[Any]) operator, an operator that takes from the source until another observable triggers an event
  • Issue #189: for Observable operators that return a single item (e.g. sumF, foldLeftF, etc.) adds variants that do the same thing, but return Task results instead, so now we have foldLeftL, sumL, etc. that return tasks
  • Issue #190: changes many observable operators, that were taking by-name parameters or initial state parameters (e.g. headOrElseF, foldLeftF, etc), to take Coeval params instead, in order to have fine control over the evaluation model
  • Issue #191: introduces by default an implicit conversion from Any to Coeval.Now, to make it easier to use Coeval as function parameters - the default will thus simply be strict evaluation, strictness being usually the default in Scala

Version 2.0-RC7 (Jun 21, 2016)

Bug fixes:

  • BUG #170: Task.materializeAttempt doesn't work for BindAsync, leading to onErrorHandleWith not working with errors triggered in flatMap on async tasks

New Features:

  • Issue #171: Add Scheduler builder on the JVM that allows specifying just the ExecutionModel, falling back global otherwise
  • Issue #174: Scalaz integration (in addition to the Cats integration) for FP goddess
  • Issue #175: Reintroduce all of project Sincron into monix-execution, which means that now monix-execution exposes Atomic references. This project was split from Monix, but the decision didn't make sense and the exposed functionality is super useful and in the spirit of monix-execution
  • Issue #176: now that we have Task, we introduce TaskApp, a safe App type that allows one to specify pure programs

Version 2.0-RC6 (Jun 15, 2016)

Breaking changes:

  • Issue #157: Renaming Observable.doOnCancel to doOnSubscriptionCancel because its meaning has changed since Monifu 1.x and it will cause pain
  • Issue #160 (breaking change): Revamp the buffer operators on Observable
  • Issue #161 (breaking change): Revamp the ConcurrentSubject and Pipe constructors

Bug fixes and enhancements:

  • Bug #153: already fixed in 2.0-RC5 for Task, but now also fixed for Coeval
  • Issue #155: Coeval enhancements and fixes
  • Issue #156: Adding Observable.doOnTerminate for executing a piece of logic when onComplete or onError happens, or when the subscriber stops the streaming with Stop
  • Issue #158: Observable.fromIterator takes now an optional onFinish callback for resource deallocation, because the Iterator interface doesn't provide a close() that could be used
  • Issue #163: added Observable.fromInputStream, fromCharsReader and fromLinesReader for reading from java.io.InputStream, java.io.Reader and java.io.BufferedReader data sources
  • Issue #164: Add Observable.executeOn, as alternative to observeOn
  • Issue #165: Simplification of the Cats integration

Version 2.0-RC5 (May 31, 2016)

Critical bug fix:

  • Bug 153 - Task.sequence and Task.gather return a shared mutable.ListBuffer

Version 2.0-RC4 (May 31, 2016)

  • Issue #89 - reintroducing a minimal Cats integration, along with tests based on cats-laws. We are splitting monix.type into its own sub-project and monix-cats depends on it. This ensures that the pick what you use approach also works with monix-cats, as people wanting just Task should not get Observable, yet Observable needs integration as well.
  • Issue #149 - documentation related fixes
    • Improved the description of Task
    • Task.unit is now a final val
    • Task.never now shares the reference instead of building a new instance every time
    • Exposing Task.unsafeStartNow and Task.unsafeStartAsync, as otherwise Task.unsafeCreate is useless. So we should expose all of them, or none at all.
    • FutureUtils.Extensions.dematerialize was named "materialize" (WTF!) and is renamed
    • Task should inherit just from Serializable and not from Product
  • Issue #150 - add a new Task.doOnFinish operator that executes once a task is finished.
  • Issue #151 - changing Future.sequence to be ordered in both execution and effects
  • Issue #152 - introduce Task.gather which behaves like the previous sequence and Task.gatherUnordered which doesn't do ordering for results either.

Version 2.0-RC3

  • Issue #147 - Make BehaviorSubject and ReplaySubject remove subscribers that triggered Stop while connecting, thus freeing the memory sooner, otherwise the GC cannot free the subscriber because its reference is kept captive until the next Subject.onNext
  • Remove tut and site from project/plugins, as the documentation will be handled in the monix.io repository
  • Re-enable code coverage in Travis and fix the build to actually test Scala 2.10.6

Version 2.0-RC2

Minor release with a single bug fix:

Version 2.0-RC1

Feature freeze. There's lots of interesting stuff to work on, but I'd rather have a stable 2.0 release first.

Bug fix:

  • Issue #143 - on RefCountObservable cancel and stop should be idempotent

Version 2.0-M2

The theme and the big issue of this release has been redesigning Task's implementation and introducing Coeval. See Issue #141 for details.

List of changes:

  • Issue #88: the Task implementation has been redesigned from scratch
  • Issue #89: Cats integration has been tried and yielded very positive results, but is being delayed
  • Issue #96 and issue 99: add MulticastStrategy for safer building of multicast Observables
  • Issue #127: Introduce operators onErrorHandle and onErrorHandleWith
  • Issue #128: operators materialize, dematerialize and memoize for Task (and Coeval)
  • Issue #113: Introduce the bufferIntrospective operator
  • Issue #123: underlying protocol changes, did some fixes for the work that already happened for M1
  • Issue #131: renamed Ack.Cancel to Ack.Stop in order to differentiate it as a verb from Cancelable.cancel, because in version 2.0 they are two different actions (and it's more semantically correct this way)
  • Issue #132: introduced the Observable.onCancelTriggerError operator
  • Issue #133: introduced the Observable.doOnDownstreamStop and doOnCancel (which is one reason for #131)
  • Issue #134: New operator Observable.switchIfEmpty
  • Issue #136: Clarify reactive streams, initiated monix.execution.rstreams for reusable subscription types and added the ReactivePublisher type class for things that can be converted to org.reactivestreams.Publisher (both Observable and Task are instances)
  • Issue #140: Add type class hierarchy, to be integrated with both Cats and Scalaz
  • Issue #141: reimplement Task from scratch, introduce Coeval, introduce Scheduler.executionModel

Version 2.0-M1

Milestone release for version 2.0, supplied as a preview. The final 2.0 release should not have major changes compared to this first milestone, but API breakage may still happen.

This version is not production ready. Use at your own risk.

List of changes:

  • Issue #60 - initiated the docs sub-project with tutorials type-checked as part of the test process
  • Issue #88 - add Monix's own Task, an alternative to Future and the Scalaz Task
  • Issue #89 - initial integration with Cats
  • Issue #90 - remove functionality that isn't relevant to the purpose of Monix and be supported
  • Issue #91 - project rename and reorganization (epic API breakage)
  • Issue #93 - renamed Observable.onSubscribe to Observable.unsafeSubscribeFn, because it shouldn't be used directly, unless you really, really know what you're doing
  • Issue #94 - fixed comments style to ScalaDoc
  • Issue #96 - removed Observable.create because it is unsafe
  • Issue #100 - enhanced the Scheduler interface
  • Issue #102 - brought back sun.misc.Unsafe (actually this was done in separate project, as part of issue #104)
  • Issue #104 - separated the Atomic implementations in the Sincron
  • Issue #106 - enabled code coverage reports
  • Issue #111 - improved test coverage
  • Issue #114 - initiated the benchmarks sub-project to track performance issues
  • Issue #115 - Cancelable.cancel now returns Unit and not Boolean
  • Issue #118 - Fix materialize, add dematerialize
  • Issue #119 - Introduced Pipe, renamed Channel in ConcurrentSubject, renamed SynchronousObserver in SyncObserver, renamed SynchronousSubscriber in SyncSubscriber
  • Issue #121 - Clarified the contract for synchronous pipelines, got rid of the hacks from internal, replacing them with macro-driven extensions for Future[Ack]
  • Issue #123 - Changed the protocol of Observable.subscribe, back-pressuring onComplete and onError is now optional and Observable.unsafeSubscribeFn needs to return a usable Cancelable instead of Unit (big internal change)
  • Issue #125 - Modified contract of AsyncScheduler, added a new ExecutorScheduler

Version 1.2

  • Issue #113 - Introduce the bufferIntrospective operator

Version 1.1

  • Issue #125 - Modify contract of AsyncScheduler, and add a new Scheduler type based entirely on Java's ScheduledExecutor
  • Update versions of sbt dependencies
  • Documentation changes (fixed missing argument in Observable docs, add code of conduct mention)
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