CurrentAction

class Util.CurrentAction()

This class encapsulates execution of a single action at a time. You set the action to execute, which waits on the currently executing action and kills any pending ones.

This class can be thought of as an Action queue that limits to 1 action running at a time, and if any new actions are pushed into it, the queue’s pending actions are cleared. (The actively running action will not get cancelled.)

Constructors

constructor()

Methods

clear()
isIdle()
set()
waitForIdle()

Constructors

CurrentAction.constructor(suppressFailures)

Arguments

suppressFailures (boolean()) – Controls whether or not thrown action errors cause waitForIdle to throw.

Creates a new CurrentAction.

Return type: CurrentAction

Methods

clear

CurrentAction.clear()

Clears and discards any pending actions. If an action is currently being executed, it remains unaffected by this.

Return type: void

isIdle

CurrentAction.isIdle()

Queries the idle state of this object.

Returns: true if there are no executing actions and false otherwise.
Return type: boolean

set

CurrentAction.set(action)

Arguments

action (ActionLike()) – None

Sets the action to execute to the one supplied.

If this object is idle, then the action is immediately executed, and this object is no longer as long as the action is running.

Otherwise if the object is not idle, then action becomes pended and will execute after the current one finishes. If an action is already pended, then the prior pending action is replaced by the newly supplied action and is discarded.

Return type: void

waitForIdle

CurrentAction.waitForIdle()

Creates Promise that can be used to wait for this object to become idle.

If this object was created with suppressFailures, then the returned Promise never throws. Otherwise action failures (from this.set) propagate to the returned Promise.

Returns: The idle Promise.
Return type: Promise <void>