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CHANGELOG.MD

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Version History

3.2.0 (17-08-2024)

  • add new API methods defaulting to Virtual Threads but allowing setting max parallelism

3.1.0 (01-05-2024)

  • use a dedicated dispatcher Virtual Thread to control parallelism
  • reject illegal RejectedExecutionHandlers at best-effort basis

3.0.0 (30-01-2024)

  • full Virtual Thread support with new API methods
  • deprecated methods removed
  • module-info

2.6.1 (01-05-2024)

  • Fixes a regression which caused undesired pollution of the provided executor

2.6.0 (27-01-2023)

  • Dispatcher no longer relies on its own thread to dispatch tasks, but uses caller thread
  • default parallelism can't be smaller than 4

2.5.0 (11-02-2021)

  • fixed a bug causing lack of eager consumption of items when processed using streaming collectors
  • optimized batching logic when collection size is equal to parallelism

2.4.1 (22-11-2020)

  • removed redundant JMH artifacts from the jar
  • add missing project metadata to the MANIFEST.MF file

2.4.0 (26-09-2020)

  • removed a redundant intermediate CompletableFuture instance creation
  • streaming collectors offload the work to the calling thread instead of creating a new thread

2.3.3 (25-04-2020)

  • fixed potential concurrency issue when dispatcher thread gets interrupted before it starts waiting on Semaphore#acquire
  • ensured progress when poison pill can't be added to the working queue

2.3.2 (27-02-2020)

  • fixed unwanted lazy semantics when parallelism == 1

2.3.1 (22-02-2020)

  • fixed ParallelCollectors.Batching visibility issues

2.3.0 (09-02-2020)

  • introduced ParallelCollectors#toFuture
  • fixed the issue with improper ordering of batched streams
  • introduced multiple performance improvements

2.2.0 (19-01-2020)

Introduced multiple performance improvements:

  • avoiding excessive allocations
  • optimizing edge cases where parallelism == 1

2.1.0 (11-12-2019)

Introduced a new subset of drop-in replacement collectors ParallelCollectors.Batching.

These implement a different task-splitting strategy where operations are performed in batches and not separately (one object in a thread pool's worker queue represents a batch of operations to be performed by a single thread):

ParallelCollectors.Batching:

  • parallel(...)
  • parallelToStream(...)
  • parallelToOrderedStream(...)

2.0.0 (20-11-2019)

Redesigned and simplified the public-facing API to enable reuse of java.util.stream.Collector instances for providing custom reduction strategies which enabled reduction of the public API from 13 methods to just 4:

  • CompletableFuture<List<T>> parallel(Function, Collector, Executor, parallelism)

  • CompletableFuture<Stream<T>> parallel(Function, Executor, parallelism)

  • Stream<T> parallelToStream(Function, Executor, parallelism)

  • Stream<T> parallelToOrderedStream(Function, Executor, parallelism)

1.2.1 (17-11-2019)

  • Adjusted visibility modifiers of some API methods

1.2.0 (16-11-2019)

  • Added new parallel methods that are interoperable with java.util.stream.Collectors
  • Simplified internal implementations
  • Deprecated parallelTo(List/Set/Map/Collection) methods in favor of the above one

1.1.0 (24-06-2019)

  • Introduced interruptions/short-circuiting of tasks when at least one exceptional completion happens
  • Deprecated parallelMap and parallelMapOrdered and replaced them with parallel and parallelOrdered

1.0.3 (09-06-2019)

  • Reimplemented CompletionOrderSpliterator with throughput in mind

1.0.2 (03-06-2019)

  • Fixed improperly configured CompletionOrderSpliterator

1.0.1 (02-05-2019)

  • Removal of redundant/unused code

1.0.0 (30-04-2019)

  • Removed deprecated methods
  • Introduced limited default parallelism (used to be unlimited)
  • Introduced new API methods: parallelMap/parallelMapOrdered

0.3.0 (05-04-2019)

  • Introduced a new API method: paralleltoStream
  • Introduced a new API method: paralleltoStreamOrdered

0.2.0 (30-03-2019)

  • Introduced a new API method ParallelCollectors.parallelToListOrdered supporting user-provided List implementations
  • Introduced a new API method ParallelCollectors.parallelToMap

0.1.2 (26-03-2019)

  • Internal exception handling improvements

0.1.1 (24-03-2019)

  • Internal structure improvements
  • Thread-safety improvements

0.1.0 (17-03-2019)

  • Introduced a new API method ParallelCollectors.parallelToListOrdered

0.0.3 (21-02-2019)

  • Improved performance
  • Improved internal implementation
  • Relaxed generic type parameters in a backward-compatible manner

0.0.2 (02-02-2019)

  • Fixed the issue with lack of short-circuiting when an exception gets thrown (#140)

0.0.1 (30-01-2019)

  • Changes to the naming convention from inParallelTo* to parallelTo*
  • Improved UnboundedParallelCollector implementation
  • Improved JavaDocs

0.0.1-RC3 (28-01-2019)

  • Moved ThrottlingParallelCollector's dispatcher thread to Collector#finisher
  • ThrottlingParallelCollector migrated to use ConcurrentLinkedQueues exclusively
  • Added exception-handling-related tests
  • Optimized empty Stream handling

0.0.1-RC2 (28-01-2019)

  • Improved documentation
  • Improved internal implementations

0.0.1-RC1 (27-01-2019)

  • Initial release providing basic functionality