async_queue

New Features

• addJob now returns a Future — await the result of any individual job without relying on listeners. Works alongside previousResult without conflict.
• Automatic retry on job exceptions — jobs that throw are automatically retried up to retryTime times. Manual retry() still works for custom logic.
• onError callback — dedicated error handler on AsyncQueue and AsyncQueue.autoStart constructors, called with (error, jobLabel) on each failure.
• Priority queue — addJob accepts a priority parameter (default 0). Higher priority jobs are placed closer to the front. Same-priority jobs maintain FIFO order.
• Pause / Resume — pause() halts processing after the current job finishes without losing queued jobs. resume() continues. Adds isPaused getter and queuePaused/queueResumed events.
• Retry with delay — addJob accepts a retryDelay Duration to wait between retry attempts. Works with both auto-retry and manual retry().
• Job timeout — addJob accepts a timeout Duration. Jobs exceeding the timeout throw TimeoutException, triggering auto-retry like any other exception.
• isRunning getter — exposes queue running state.
• add QueueEventType.jobError, QueueEventType.queuePaused, QueueEventType.queueResumed events

Bug Fixes

• fix post-increment bug in duplicate label tracking (value was never actually incremented)
• fix null crash when retry() is called on an empty queue
• fix _previousResult leaking across separate start() runs
• fix addJobThrow label parameter type from String? to Object? to match addJob
• fix _isForcedStop flag now properly cleared after start() loop exits instead of immediately in stop()
• fix failed nodes after auto-retry limit never being removed from queue (caused infinite loop)

Code Cleanup

• sync AsyncQueueInterface signatures with actual implementation
• remove dead commented-out code (list(), getJobInfo()) from source and interface
• remove unused imports and stray print() calls from tests

Tests

• add test coverage for addJob returning Future (result, chaining, autoStart, previousResult, closed queue)
• add test coverage for AsyncQueue.autoStart() (execution order, late adds, events, stop)
• add tests for onError callback, priority ordering, pause/resume, retry delay, and job timeout
• add meaningful job label assertions in event tests
• clean up async_queue_info_test.dart with actual assertions

• fix wrong job label on QueueEventType.newJobAdded

• fix issue that queue listener return wrong job label

• add Flutter example
• add allowDuplicate default to true.
• add throwIfDuplicate default to false.
• change AsyncJob = Function(PreviousResult previousResult). This allows you to access the previous job's result when adding new job.
• remove list, getJobInfo, and addNode from version 2.0.0-dev.1 as not needed.
• hide AsyncNode
• remove JobInfo
• change job label type from String to Object
• add current running job label CurrentJobUpdater to notify every time a job is running

• change job label type from String to Object
• add current running job label CurrentJobUpdater to notify every time a job is running

• add Flutter example
• add allowDuplicate default to true.
• add throwIfDuplicate default to false.
• change AsyncJob = Function(PreviousResult previousResult). This allows you to access the previous job's result when adding new job.
• remove list, getJobInfo, and addNode from version 2.0.0-dev.1 as not needed.
• hide AsyncNode
• remove JobInfo

• option to add the job that failed back in to the queue. (last position)
• expose [AsyncNode]
• [addNode] on [AsyncQueue]

• option to add label and description when adding job
• [label] need to be unique unless [DuplicatedLabelException] will throw.
• in [AsyncQueue.addJob] if provide retryTime = -1 will make the job retry infinitely until it success. You still have to explicitly call retry. Be careful when using this option.
• emit event when job hits its max retry limit [QueueEventType.retryLimitReached]
• add [AsyncQueue.list] and [AsyncQueue.getJobInfo] to retrieve the jobs info event when queue finished
• add [AsyncQueue.clear] to clear the info list and also stop the queue if it's running

• add stop() to stop and remove all remaining jobs in the queue
• add retry() to retry the job, default to 1 time, but user can set as many time as they want
• remove {bool forceStop = false} in close() since we now have stop method
• fix typo
• add test cases

• add Flutter use cases into README

• [breaking change] remove beforeListener and afterListener. One listener will emit event with type.
• add close({bool forceStop = false}) close the queue so that no more job can be added. [forceStop] if true, all remain jobs will be canceled
• addJobThrow Add new job in to the queue if the queue is closed, throw [ClosedQueueException]
• add test cases

• (Normal Queue) Add multiple jobs into queue before firing
• (Auto Queue) Firing job as soon as any job is added to the queue
• (Both) Option to add queue listener that happens before or after execute every job