org.apache.oozie.service
Class SchedulerService

java.lang.Object
  org.apache.oozie.service.SchedulerService

All Implemented Interfaces:

Service

public class SchedulerService
extends Object
implements Service

This service executes scheduled Runnables and Callables at regular intervals.

It uses a java.util.concurrent.ScheduledExecutorService.

The SCHEDULER_THREADS configuration property indicates how many threads the scheduler will use to run scheduled commands.

Nested Class Summary

static class

SchedulerService.Unit

Field Summary

static String	CONF_PREFIX
static String	SCHEDULER_THREADS

Fields inherited from interface org.apache.oozie.service.Service

DEFAULT_LOCK_TIMEOUT, lockTimeout, USE_XCOMMAND

Constructor Summary

SchedulerService()

Method Summary

void	destroy() Destroy the scheduler service.
Class<? extends Service>	getInterface() Return the public interface for scheduler service.
int	getSchedulableThreads(org.apache.hadoop.conf.Configuration conf) Return the number of threads configured with the Scheduler Service
ScheduledExecutorService	getScheduler() Return the java.util.concurrent.ScheduledExecutorService instance used by the SchedulerService.
void	init(Services services) Initialize the scheduler service.
void	schedule(Callable<Void> callable, long delay, long interval, SchedulerService.Unit unit) Schedule a Callable for execution.
void	schedule(Runnable runnable, long delay, long interval, SchedulerService.Unit unit) Schedule a Runnable for execution.
void	schedule(Runnable runnable, long delay, SchedulerService.Unit unit) Schedule a Runnable for execution.

Methods inherited from class java.lang.Object

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

Field Detail

CONF_PREFIX

public static final String CONF_PREFIX

See Also:

Constant Field Values

SCHEDULER_THREADS

public static final String SCHEDULER_THREADS

See Also:

Constant Field Values

Constructor Detail

SchedulerService

public SchedulerService()

Method Detail

init

public void init(Services services)

Initialize the scheduler service.

Specified by:

init in interface Service

Parameters:

services - services instance.

destroy

public void destroy()

Destroy the scheduler service.

Specified by:

destroy in interface Service

getInterface

public Class<? extends Service> getInterface()

Return the public interface for scheduler service.

Specified by:

getInterface in interface Service

Returns:

SchedulerService.

getScheduler

public ScheduledExecutorService getScheduler()

Return the java.util.concurrent.ScheduledExecutorService instance used by the SchedulerService.

Returns:

the scheduled executor service instance.

getSchedulableThreads

public int getSchedulableThreads(org.apache.hadoop.conf.Configuration conf)

Return the number of threads configured with the Scheduler Service

Parameters:

conf -

Returns:

int num threads

schedule

public void schedule(Callable<Void> callable,
                     long delay,
                     long interval,
                     SchedulerService.Unit unit)

Schedule a Callable for execution.

Parameters:

callable - callable to schedule for execution.

delay - delay for first execution since scheduling.

interval - interval between executions.

unit - scheduling unit.

schedule

public void schedule(Runnable runnable,
                     long delay,
                     long interval,
                     SchedulerService.Unit unit)

Schedule a Runnable for execution.

Parameters:

runnable - Runnable to schedule for execution.

delay - delay for first execution since scheduling.

interval - interval between executions.

unit - scheduling unit.

schedule

public void schedule(Runnable runnable,
                     long delay,
                     SchedulerService.Unit unit)

Schedule a Runnable for execution.

Parameters:

runnable - Runnable to schedule for execution.

delay - the time from now to delay execution.

unit - scheduling unit.