@Public

Package org.apache.hadoop.service

Support for services.

Interface Summary

Interface	Description
Service	Service LifeCycle.
ServiceStateChangeListener	Interface to notify state changes of a service.

Class Summary

Class	Description
AbstractService	This is the base implementation class for services.
CompositeService	Composition of services.
CompositeService.CompositeServiceShutdownHook	JVM Shutdown hook for CompositeService which will stop the give CompositeService gracefully in case of JVM shutdown.
LifecycleEvent	A serializable lifecycle event: the time a state transition occurred, and what state was entered.
LoggingStateChangeListener	This is a state change listener that logs events at INFO level
ServiceOperations	This class contains a set of methods to work with services, especially to walk them through their lifecycle.
ServiceOperations.ServiceListeners	Class to manage a list of ServiceStateChangeListener instances, including a notification loop that is robust against changes to the list during the notification process.
ServiceStateModel	Implements the service state model.

Enum Summary

Enum	Description
Service.STATE	Service states

Exception Summary

Exception	Description
ServiceStateException	Exception that can be raised on state change operations, whose exit code can be explicitly set, determined from that of any nested cause, or a default value of LauncherExitCodes.EXIT_SERVICE_LIFECYCLE_EXCEPTION.