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databricks.labs.dqx.actions.destinations.callback

Callback alert destination for DQX actions.

Delivers DQX alert messages by invoking an in-process Python callable. This destination is not persistable; the serializer skips it with a warning when persisting destination configurations to storage.

DQCallbackAlertDestination Objects​

class DQCallbackAlertDestination(AlertDestination)

In-process callback destination that invokes a Python callable on delivery.

Useful for testing and for scenarios where alert handling must occur in the same process (e.g. raising exceptions, writing to an in-memory buffer, or triggering a custom side effect).

This destination is intentionally not persistable. The serializer skips instances of this class with a warning rather than attempting to persist the callback field. It is still a valid runtime destination.

Attributes:

  • type - Discriminator literal, always "callback".
  • name - Logical name for this destination instance.
  • callback - Python callable invoked by deliver. Must accept an AlertMessage and an ActionContext and return None.

deliver​

def deliver(message: AlertMessage, context: ActionContext,
            _services: ActionServices) -> None

Invoke callback with message and context.

The _services parameter is unused by this destination because delivery is entirely in-process; it is accepted to satisfy the AlertDestination interface.

Arguments:

  • message - Immutable alert message payload assembled by StandardMessageBuilder.
  • context - Immutable snapshot of run-time state for the DQX run.