squadron 4.3.8

Multithreading and worker thread pool for Dart / Flutter, to offload CPU-bound and heavy I/O tasks to Isolate or Web Worker threads.

4.3.8

• Downgrade meta version to ^1.8.0 to match flutter_test requirements (fix for https://github.com/d-markey/squadron/issues/18).

4.3.7

• Ensure uniqueness of cancellation token IDs across workers (breaking change for classes implementing/deriving from CancellationToken: id is now a String).

4.3.6

• Downgrade meta version to ^1.8.0 to match flutter_test requirements.
• Fix pool scheduler algorithm to ensure worker availability before dispatching tasks.

4.3.5

• Add UseLogger annotation to have package squadron_builder generate the associated code in worker threads.

4.3.4

• Add notifications when a worker is added or removed. Interested components can register listeners (callbacks) for these notifications.
• Disable automatic log-forwarding between workers and their parents. It is possible to restore this behaviour manually by using [ParentSquadronLogger] as a logger during initialization of the platform worker.
• Split logging logic between message formatting vs. emitting.

4.3.3

• Rename SquadronSerializer to SquadronMarshaller.
• Update dev dependencies.

4.3.2

• WorkerResponse: if result is an Iterable but not a List, call toList() to get results before serializing the response back to the caller.
• SerializeWith: annotation used to indicate how to marshal data to/from a service running in a Worker. See also SquadronSerializer class.

4.3.1

• CancellationToken: provide Future<bool> isCancelled({bool throwIfCancelled = false}) to make it easier to check cancellation token status in worker services.

4.3.0

• ValueWrapper: check future hasn't already completed before calling complete() or completeError().

4.2.0

• Add baseUrl parameter to SquadronService annotation.

4.1.0

• Now with annotations to support code generation. To be used with package squadron-builder.

4.0.0

• Breaking changes: all deprecated artefacts have been removed.
• Breaking change: LocalSquadronLogger has been deleted.
• Breaking change: the args and token arguments of methods send() and stream() are now named argument.
• Breaking change: removed the optional id parameter that was passed to Worker constructors.
• Breaking change: disabled message inspection for Web channels. In previous versions, Squadron would inspect each piece of data exchanged via _JsChannels to identify objects whose ownership must be transfered to the receiving end (the transfer argument in postMessage). However most of the time, the request / response objects are usually made of List, Map, and base types, all of which can cross thread boundaries "as-is". This behavior is now controlled by optional parameters inspectRequest and inspectResponse of methods Worker.execute() and Worker.stream(), defaulting to false thus disabling message inspection. Passing true will activate message inspection for request and/or response and will be necessary when the message contains an object whose ownership must be transfered to the receiving end, typicaly a MessagePort. Basic testing found message transfer time improvement around ~5-10% for large payloads, e.g. a List containing many Map items (note that in Web scenarios, JSON serialization could prove a more efficient alternative). It should have little to no effect on smaller messages. Start requests will always be processed with inspectRequest = true and inspectResponse = true.
• Fixed issue with workers on native platforms: ensure all ReceivePorts are closed upon Isolate termination.
• Support logging accross workers (which made LocalSquadronLogger obsolete).
• Added support to reset the Squadron singleton.
• Reworked examples & unit tests.

3.4.0

• Rewritten streaming implementations (fix for https://github.com/d-markey/squadron/issues/8).
• Added unit tests.

3.3.2

• Implemented a LocalLogger to have Web workers log messages from the main window (effectively logging via Dart debugger if present).
• Removed import of dart:isolate from _worker_runner.dart.
• Made coverage a dev dependency.
• Added a tool to extract coverage metrics during Github Dart workflow.
• Updates badges to include coverage metrics and platform info.

3.3.1

• Fixed streaming from LocalWorker.
• Added tests for LocalWorker.
• Improved cancellation handling.
• Added tests to improve test coverage.

3.3.0

• Implemented LocalWorker, a worker-like class living in the same thread as its owner and available for inter-worker messaging. For instance, in a Flutter app, instantiating a LocalWorker in the main thread enables other workers to (indirectly) call Flutter APIs that are otherwise not available in the context of a secondary thread.
• LocalWorker uses the same concepts and approach as Workers, such as the operations map and the WorkerService interface.

3.2.2

• Document types and release mode (special thanks to SwissCheese5).
• More error handling at communication points.
• Use lower log levels for internal Squadron log messages.
• Added test coverage.

3.2.1

• Document the new logging feature.
• Make sendRequest() async in browser Channel (implementation closer to that of native Channel).
• Add a timestamp to pool workers to record the time when it was assigned its last task.
• Sort pool workers to distribute tasks to those that have the largest capacity and the oldest timestamp.
• Add command property to WorkerException.
• Reorganized the test folder.
• Recompiled test Web workers.

3.2.0

• Added a logging mechanism to facilitate debugging Squadron's internals.
• Reworked connection flow between main program and worker.
• Reworked task scheduling.
• Fixed issue https://github.com/d-markey/squadron/issues/3.
• Added tests for logging and workers failing to initialize.

3.1.4

• Implemented cancellation token to enable worker task notification that cancellation has occured.
• Implemented TimeOutToken, CancellableToken and CompositeToken.
• Updated README.md.
• Added unit tests.

3.1.0

• Several minor changes (some possibly breaking changes but easy to fix).
• Split library into squadron_service.dart (worker services only), squadron_worker.dart (worker services and workers without pool) vs. squadron.dart (worker services, workers and pools).
• Split Channel into Channel (used to send a WorkerRequest) and WorkerChannel (used to send a WorkerResponse).
• Added ConcurrencySettings to eventually replace minWorkers, maxWorkers and maxParallel.
• Added WorkerPool.execute() (will eventually replace WorkerPool.compute()).
• Added WorkerPool.scheduleTask() to schedule a ValueTask. Result will be accessible from future ValueTask.value.
• Added WorkerPool.scheduleStream() to schedule a StreamTask. Results will be accessible from stream StreamTask.stream.
• ValueTask and StreamTask provide information on task execution (eg. status, wait time, execution time...).
• Added WorkerPool.cancel() to support worker task cancellation.
• Updated README.md.
• Added unit tests.

3.0.0

• Split library into squadron_service.dart (worker services only), squadron.dart (worker services and workers without pool) vs. squadron_pool.dart (worker services, workers and pools).
• Moved connect() and process() from Worker to WorkerService.
• Provided the run() function to facilitate implementation of platform workers.
• Adapted tests and examples.
• Updated README.md.

2.0.2

• Single test code base for both platforms.
• Added BitCoin service to test live network access from workers (courtesy of coindesk.com).
• Added PiDigits service (related to https://github.com/d-markey/squadron/issues/1).
• Retaining attempts based on manually operating a browser to run tests in /web (different test code base) and /test/browser-tests (same test code base).

2.0.1

• Remove dependency on js package.

2.0.0

• This version supports workers running in Isolates as well as Web Workers.
• Platform implementations are now more straightforward thanks to Worker.connect() and Worker.process().
• See examples on how to scaffold services, Squadron Workers and platform workers.
• Added tests for Web Workers (run with dart run build_runner serve -r and point your browser to http://localhost:8080/index.html).

1.0.2

• Added support for minimum count of workers in pool.
• Make sure Isolate is killed when the worker is stopped.
• Keep track of stats from stopped workers.
• Update tests & examples (proper error handling, command map, worker monitoring).

1.0.1

• Improve error handling.
• Improve documentation.
• Add unit tests.

1.0.0

• Initial version.