Class SequenceHandler<TIn, TOut>

A composite handler that will try to run all supporting handlers sequentially and return the value of the last supported handler. The canHandle check of this handler will always succeed.

Type Parameters

  • TIn = void

  • TOut = void

Hierarchy

Constructors

Properties

Methods

Constructors

Properties

handlers: AsyncHandler<TIn, TOut>[]

Methods

  • Checks if the input can be handled by this class. If it cannot handle the input, rejects with an error explaining why.

    Parameters

    • input: TIn

      Input that could potentially be handled.

    Returns Promise<void>

    A promise resolving if the input can be handled, rejecting with an Error if not.

  • Handles the given input. This may only be called if canHandle did not reject. When unconditionally calling both in sequence, consider handleSafe instead.

    Parameters

    • input: TIn

      Input that needs to be handled.

    Returns Promise<undefined | TOut>

    A promise resolving when handling is finished.

  • Helper function that first runs canHandle followed by handle. Throws the error of canHandle if the data cannot be handled, or returns the result of handle otherwise.

    Parameters

    • input: TIn

      Input data that will be handled if it can be handled.

    Returns Promise<undefined | TOut>

    A promise resolving if the input can be handled, rejecting with an Error if not.