Package org.apache.hadoop.lib.service.instrumentation

Class InstrumentationService

java.lang.Object

org.apache.hadoop.lib.server.BaseService

org.apache.hadoop.lib.service.instrumentation.InstrumentationService

All Implemented Interfaces:

Service, Instrumentation

@Private
public class InstrumentationService
extends BaseService
implements Instrumentation

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.lib.service.Instrumentation

Instrumentation.Variable<T>

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
InstrumentationService()

Method Summary

Modifier and Type	Method	Description
void	addCron(String group, String name, Instrumentation.Cron cron)
void	addSampler(String group, String name, int samplingSize, Instrumentation.Variable<Long> variable)
void	addVariable(String group, String name, Instrumentation.Variable<?> variable)
org.apache.hadoop.lib.service.instrumentation.InstrumentationService.Cron	createCron()
Class	getInterface()	Returns the interface implemented by this service.
Map<String,Map<String,?>>	getSnapshot()
void	incr(String group, String name, long count)
void	init()	Initializes the server.
void	postInit()	Post initializes the service.

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

destroy, getPrefix, getPrefixedName, getServer, getServiceConfig, getServiceDependencies, init, 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_TIMERS_SIZE

public static final String CONF_TIMERS_SIZE

See Also:

• Constant Field Values

Constructor Details

InstrumentationService

public InstrumentationService()

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.

postInit

public void postInit()
              throws ServiceException

Description copied from class: BaseService

Post initializes the service. This method is called by the Server after all services of the server have been initialized.

This method does a NOP.

Specified by:

postInit in interface Service

Overrides:

postInit in class BaseService

Throws:

ServiceException - thrown if the service could not be post-initialized.

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.

createCron

public org.apache.hadoop.lib.service.instrumentation.InstrumentationService.Cron createCron()

Specified by:

createCron in interface Instrumentation

incr

public void incr(String group,
 String name,
 long count)

Specified by:

incr in interface Instrumentation

addCron

public void addCron(String group,
 String name,
 Instrumentation.Cron cron)

Specified by:

addCron in interface Instrumentation

addVariable

public void addVariable(String group,
 String name,
 Instrumentation.Variable<?> variable)

Specified by:

addVariable in interface Instrumentation

addSampler

public void addSampler(String group,
 String name,
 int samplingSize,
 Instrumentation.Variable<Long> variable)

Specified by:

addSampler in interface Instrumentation

getSnapshot

public Map<String,Map<String,?>> getSnapshot()

Specified by:

getSnapshot in interface Instrumentation