MachineCollection creates a new typed [statemachines.Collection] for callbacks.

NewCallback creates a new callback in the STANDBY state from given params.

NewWorkflowClosedTrigger creates a WorkflowClosed trigger variant.

StateMachineType is a unique type identifier for this state machine.

Callback state machine.

EventAttemptFailed is triggered when an attempt is failed with a retryable error.

EventFailed is triggered when an attempt is failed with a non retryable error.

EventRescheduled is triggered when the callback is meant to be rescheduled after backing off from a previous attempt.

EventScheduled is triggered when the callback is meant to be scheduled for the first time - when its Trigger condition is met.

EventSucceeded is triggered when an attempt succeeds.

HTTPCaller is a method that can be used to invoke HTTP requests.