# Package net.corda.node.services.api

- Interface Summary
  Interface | Description
  --- | ---
  AcceptsFileUpload | A service that implements AcceptsFileUpload can have new binary data provided to it via an HTTP upload.
  CheckpointStorage | Thread-safe storage of fiber checkpoints.
  MessagingServiceBuilder<T extends MessagingServiceInternal> | This class lets you start up a `interface MessagingService`. Its purpose is to stop you from getting access to the methods on the messaging service interface until you have successfully started up the system. One of these objects should be the only way to obtain a reference to a `interface MessagingService`. Startup may be a slow process: some implementations may let you cast the returned future to an object that lets you get status info.
  MessagingServiceInternal |
  RegulatorService | Placeholder interface for regulator services.
  SchemaService | A configuration and customisation point for Object Relational Mapping of contract state objects.

- Class Summary
  Class | Description
  --- | ---
  AbstractNodeService | Abstract superclass for services that a node can host, which provides helper functions.
  Checkpoint |
  MonitoringService | Provides access to various metrics and ways to notify monitoring services of things, for sysadmin purposes. This is not an interface because it is too lightweight to bother mocking out.
  ServiceHubInternal |
  ServiceHubInternalKt |