Package org.apache.hadoop.lib.service.scheduler

Class SchedulerService

java.lang.Object

org.apache.hadoop.lib.server.BaseService

org.apache.hadoop.lib.service.scheduler.SchedulerService

All Implemented Interfaces:

Service, Scheduler

@Private
public class SchedulerService
extends BaseService
implements Scheduler

Field Summary

Fields

Modifier and Type	Field	Description
static final String	CONF_THREADS
static final String	PREFIX

Constructor Summary

Constructors

Constructor	Description
SchedulerService()

Method Summary

Modifier and Type	Method	Description
void	destroy()	Destroy the services.
Class	getInterface()	Returns the interface implemented by this service.
Class[]	getServiceDependencies()	Returns the service dependencies of this service.
void	init()	Initializes the server.
void	schedule(Runnable runnable, long delay, long interval, TimeUnit unit)
void	schedule(Callable<?> callable, long delay, long interval, TimeUnit unit)

Methods inherited from class org.apache.hadoop.lib.server.BaseService

getPrefix, getPrefixedName, getServer, getServiceConfig, init, postInit, serverStatusChange

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

PREFIX

public static final String PREFIX

See Also:

• Constant Field Values

CONF_THREADS

public static final String CONF_THREADS

See Also:

• Constant Field Values

Constructor Details

SchedulerService

public SchedulerService()

Method Details

init

public void init()
          throws ServiceException

Description copied from class: BaseService

Initializes the server.

This method is called by BaseService.init(Server) after all service properties (properties prefixed with

Specified by:

init in class BaseService

Throws:

ServiceException - thrown if the service could not be initialized.

destroy

public void destroy()

Description copied from class: BaseService

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

This method does a NOP.

Specified by:

destroy in interface Service

Overrides:

destroy in class BaseService

getServiceDependencies

public Class[] getServiceDependencies()

Description copied from class: BaseService

Returns the service dependencies of this service. The service will be instantiated only if all the service dependencies are already initialized.

This method returns an empty array (size 0)

Specified by:

getServiceDependencies in interface Service

Overrides:

getServiceDependencies in class BaseService

Returns:

an empty array (size 0).

getInterface

public Class getInterface()

Description copied from interface: Service

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.

Specified by:

getInterface in interface Service

Returns:

the interface that identifies the service.

schedule

public void schedule(Callable<?> callable,
 long delay,
 long interval,
 TimeUnit unit)

Specified by:

schedule in interface Scheduler

schedule

public void schedule(Runnable runnable,
 long delay,
 long interval,
 TimeUnit unit)

Specified by:

schedule in interface Scheduler