traits_futures.background_iteration module

Background task that sends results from an iteration.

class traits_futures.background_iteration.BackgroundIteration

Bases: traits.has_traits.HasStrictTraits

Object representing the background iteration to be executed.

args = Tuple()

Positional arguments to be passed to the callable.

callable = Callable()

The callable to be executed. This should return something iterable.

future(cancel)

Return a Future for the background task.

Parameters

cancel – Zero-argument callable, returning no useful result. The returned future’s cancel method should call this to request cancellation of the associated background task.

Returns

future – Future object that can be used to monitor the status of the background task.

Return type

IterationFuture

kwargs = Dict(Str())

Named arguments to be passed to the callable.

task()

Return a background callable for this task specification.

Returns

task – Callable accepting arguments send and cancelled. The callable can use send to send messages and cancelled to check whether cancellation has been requested.

Return type

IterationTask

traits_futures.background_iteration.GENERATED = 'generated'

Message sent whenever the iteration yields a result. The message argument is the result generated.

class traits_futures.background_iteration.IterationFuture

Bases: traits_futures.base_future.BaseFuture

Foreground representation of an iteration executing in the background.

result_event = Event()

Event fired whenever a result arrives from the background iteration.

class traits_futures.background_iteration.IterationTask(callable, args, kwargs)

Bases: traits_futures.base_future.BaseTask

Iteration to be executed in the background.

run()

Run the body of the background task.

Returns

any – May return any object. That object will be delivered to the future’s result attribute.

Return type

object

traits_futures.background_iteration.submit_iteration(executor, callable, *args, **kwargs)

Submit an iteration to an executor.

Parameters

• executor (TraitsExecutor) – Executor to submit the task to. This argument should always be passed by position rather than by name. Future versions of the library may enforce this restriction.

• callable – Callable returning an iterator when called with the given arguments. This argument should always be passed by position rather than by name. Future versions of the library may enforce this restriction.

• *args – Positional arguments to pass to the callable.

• **kwargs – Named arguments to pass to the callable.

Returns

future – Object representing the state of the background iteration.

Return type

IterationFuture