org.apache.lens.server
Class EventServiceImpl

java.lang.Object
  org.apache.hive.service.AbstractService
      org.apache.lens.server.EventServiceImpl

All Implemented Interfaces:

org.apache.hive.service.Service, LensEventService

public class EventServiceImpl
extends org.apache.hive.service.AbstractService
implements LensEventService

Implementation of LensEventService

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hive.service.Service

org.apache.hive.service.Service.STATE

Field Summary

static org.apache.commons.logging.Log

LOG The Constant LOG.

Fields inherited from interface org.apache.lens.server.api.events.LensEventService

NAME

Constructor Summary

EventServiceImpl(String name)
Instantiates a new event service impl.

Method Summary

<T extends LensEvent> void	addListenerForType(LensEventListener<? super T> listener, Class<T> eventType) Add a listener for the given event type.
Map<Class<? extends LensEvent>,List<LensEventListener>>	getEventListeners()
<T extends LensEvent> Collection<LensEventListener>	getListeners(Class<T> eventType) Get all listeners of a particular type.
void	init(org.apache.hadoop.hive.conf.HiveConf hiveConf)
void	notifyEvent(LensEvent evt) Process an event, and notify all listeners interested in this event.
void	removeListener(LensEventListener listener) Remove this listener instance from all subscribed event types.
<T extends LensEvent> void	removeListenerForType(LensEventListener<? super T> listener, Class<T> eventType) Remove listener for a given event type.
void	start()
void	stop()

Methods inherited from class org.apache.hive.service.AbstractService

getHiveConf, getName, getServiceState, getStartTime, register, unregister

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.apache.commons.logging.Log LOG

The Constant LOG.

Constructor Detail

EventServiceImpl

public EventServiceImpl(String name)

Instantiates a new event service impl.

Parameters:

name - the name

Method Detail

init

public void init(org.apache.hadoop.hive.conf.HiveConf hiveConf)

Specified by:

init in interface org.apache.hive.service.Service

Overrides:

init in class org.apache.hive.service.AbstractService

removeListener

public void removeListener(LensEventListener listener)

Description copied from interface: LensEventService

Remove this listener instance from all subscribed event types.

Specified by:

removeListener in interface LensEventService

Parameters:

listener - the listener

notifyEvent

public void notifyEvent(LensEvent evt)
                 throws LensException

Description copied from interface: LensEventService

Process an event, and notify all listeners interested in this event.

Specified by:

notifyEvent in interface LensEventService

Parameters:

evt - object

Throws:

LensException - the lens exception

getListeners

public <T extends LensEvent> Collection<LensEventListener> getListeners(Class<T> eventType)

Description copied from interface: LensEventService

Get all listeners of a particular type.

Specified by:

getListeners in interface LensEventService

Parameters:

eventType - the change type

Returns:

all the listeners

start

public void start()

Specified by:

start in interface org.apache.hive.service.Service

Overrides:

start in class org.apache.hive.service.AbstractService

stop

public void stop()

Specified by:

stop in interface org.apache.hive.service.Service

Overrides:

stop in class org.apache.hive.service.AbstractService

getEventListeners

public Map<Class<? extends LensEvent>,List<LensEventListener>> getEventListeners()

addListenerForType

public <T extends LensEvent> void addListenerForType(LensEventListener<? super T> listener,
                                                     Class<T> eventType)

Description copied from interface: LensEventService

Add a listener for the given event type. Use this method to register if the same class is expected to receive events of different types

Specified by:

addListenerForType in interface LensEventService

Parameters:

listener - the listener

eventType - the event type

removeListenerForType

public <T extends LensEvent> void removeListenerForType(LensEventListener<? super T> listener,
                                                        Class<T> eventType)

Description copied from interface: LensEventService

Remove listener for a given event type.

Specified by:

removeListenerForType in interface LensEventService

Parameters:

listener - the listener

eventType - the event type