# Package net.corda.node.services.events

- Class Summary
  Class | Description
  --- | ---
  NodeSchedulerService | A first pass of a simple `interface SchedulerService` that works with `class MutableClock`s for testing, demonstrations and simulations that also encompasses the Vault observer for processing transactions.
  ScheduledActivityObserver | This observes the vault and schedules and unschedules activities appropriately based on state production and consumption.