Class MatrixScheduler<T>

Type Parameters

Hierarchy

  • MatrixScheduler

Constructors

constructor

Properties

activeQueues procFn queueAlgorithm queues retryAlgorithm

Methods

getQueueForEvent peekNextEvent processQueue queueEvent removeEventFromQueue removeNextEvent setProcessFunction startProcessingQueues QUEUE_MESSAGES RETRY_BACKOFF_RATELIMIT

Constructors

constructor

  • Construct a scheduler for Matrix. Requires setProcessFunction to be provided with a way of processing events.

    Type Parameters

    Parameters

    • retryAlgorithm: ((event: null | MatrixEvent, attempts: number, err: MatrixError) => number) = MatrixScheduler.RETRY_BACKOFF_RATELIMIT

      Optional. The retry algorithm to apply when determining when to try to send an event again. Defaults to RETRY_BACKOFF_RATELIMIT.

        • (event: null | MatrixEvent, attempts: number, err: MatrixError): number

        • Retries events up to 4 times using exponential backoff. This produces wait times of 2, 4, 8, and 16 seconds (30s total) after which we give up. If the failure was due to a rate limited request, the time specified in the error is waited before being retried.

          See

          retryAlgorithm

          Parameters

          • event: null | MatrixEvent
          • attempts: number

            Number of attempts that have been made, including the one that just failed (ie. starting at 1)

          • err: MatrixError

          Returns number

    • queueAlgorithm: ((event: MatrixEvent) => null | string) = MatrixScheduler.QUEUE_MESSAGES

      Optional. The queuing algorithm to apply when determining which events should be sent before the given event. Defaults to QUEUE_MESSAGES.

        • (event: MatrixEvent): null | string

        • Queues m.room.message events and lets other events continue concurrently.

          See

          queueAlgorithm

          Parameters

          Returns null | string

    Returns MatrixScheduler<T>

Properties

Private activeQueues

activeQueues: string[] = []

Private procFn

procFn: null | ProcessFunction<T> = null

Readonly queueAlgorithm

queueAlgorithm: ((event: MatrixEvent) => null | string) = MatrixScheduler.QUEUE_MESSAGES

Type declaration

    • (event: MatrixEvent): null | string

    • The queuing algorithm to apply to events. This function must be idempotent as it may be called multiple times with the same event. All queues created are serviced in a FIFO manner. To send the event ASAP, return null which will not put this event in a queue. Events that fail to send that form part of a queue will be removed from the queue and the next event in the queue will be sent.

      Returns

      The name of the queue to put the event into. If a queue with this name does not exist, it will be created. If this is null, the event is not put into a queue and will be sent concurrently.

      Parameters

      Returns null | string

Private Readonly queues

queues: Record<string, IQueueEntry<T>[]> = {}

Readonly retryAlgorithm

retryAlgorithm: ((event: null | MatrixEvent, attempts: number, err: MatrixError) => number) = MatrixScheduler.RETRY_BACKOFF_RATELIMIT

Type declaration

    • (event: null | MatrixEvent, attempts: number, err: MatrixError): number

    • The retry algorithm to apply when retrying events. To stop retrying, return -1. If this event was part of a queue, it will be removed from the queue.

      Returns

      The number of milliseconds to wait before trying again. If this is 0, the request will be immediately retried. If this is -1, the event will be marked as NOT_SENT and will not be retried.

      Parameters

      • event: null | MatrixEvent

        The event being retried.

      • attempts: number

        The number of failed attempts. This will always be >= 1.

      • err: MatrixError

        The most recent error message received when trying to send this event.

      Returns number

Methods

getQueueForEvent

  • Retrieve a queue based on an event. The event provided does not need to be in the queue.

    Returns

    A shallow copy of events in the queue or null. Modifying this array will not modify the list itself. Modifying events in this array will modify the underlying event in the queue.

    See

    MatrixScheduler.removeEventFromQueue To remove an event from the queue.

    Parameters

    Returns null | MatrixEvent[]

Private peekNextEvent

Private processQueue

  • Parameters

    • queueName: string

    Returns void

queueEvent

  • Queue an event if it is required and start processing queues.

    Returns

    A promise if the event was queued, which will be resolved or rejected in due time, else null.

    Parameters

    Returns null | Promise<T>

removeEventFromQueue

  • Remove this event from the queue. The event is equal to another event if they have the same ID returned from event.getId().

    Returns

    True if this event was removed.

    Parameters

    Returns boolean

Private removeNextEvent

setProcessFunction

  • Set the process function. Required for events in the queue to be processed. If set after events have been added to the queue, this will immediately start processing them.

    Parameters

    • fn: ProcessFunction<T>

      The function that can process events in the queue.

    Returns void

Private startProcessingQueues

Static QUEUE_MESSAGES

  • Queues m.room.message events and lets other events continue concurrently.

    See

    queueAlgorithm

    Parameters

    Returns null | string

Static RETRY_BACKOFF_RATELIMIT

  • Retries events up to 4 times using exponential backoff. This produces wait times of 2, 4, 8, and 16 seconds (30s total) after which we give up. If the failure was due to a rate limited request, the time specified in the error is waited before being retried.

    See

    retryAlgorithm

    Parameters

    • event: null | MatrixEvent
    • attempts: number

      Number of attempts that have been made, including the one that just failed (ie. starting at 1)

    • err: MatrixError

    Returns number

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