Package org.apache.hadoop.lib.server

Interface Service

All Known Implementing Classes:
BaseService, FileSystemAccessService, GroupsService, InstrumentationService, SchedulerService
@Private public interface Service
Service interface for components to be managed by the Server class.

  • Method Details

    • init

      void init(Server server) throws ServiceException
      Initializes the service. This method is called once, when the Server owning the service is being initialized.
      Parameters:
      server - the server initializing the service, give access to the server context.
      Throws:
      ServiceException - thrown if the service could not be initialized.

    • postInit

      void postInit() throws ServiceException
      Post initializes the service. This method is called by the Server after all services of the server have been initialized.
      Throws:
      ServiceException - thrown if the service could not be post-initialized.

    • destroy

      void destroy()
      Destroy the services. This method is called once, when the Server owning the service is being destroyed.

    • getServiceDependencies

      Class[] getServiceDependencies()
      Returns the service dependencies of this service. The service will be instantiated only if all the service dependencies are already initialized.
      Returns:
      the service dependencies.

    • getInterface

      Class getInterface()
      Returns the interface implemented by this service. This interface is used the Server when the Server.get(Class) method is used to retrieve a service.
      Returns:
      the interface that identifies the service.

    • serverStatusChange

      void serverStatusChange(Server.Status oldStatus, Server.Status newStatus) throws ServiceException
      Notification callback when the server changes its status.
      Parameters:
      oldStatus - old server status.
      newStatus - new server status.
      Throws:
      ServiceException - thrown if the service could not process the status change.