org.apache.hadoop.yarn.event

クラス AsyncDispatcher

java.lang.Object

org.apache.hadoop.service.AbstractService

org.apache.hadoop.yarn.event.AsyncDispatcher

すべての実装されたインタフェース:

Closeable, AutoCloseable, Service, Dispatcher

@InterfaceAudience.Public
 @InterfaceStability.Evolving
public class AsyncDispatcher
extends AbstractService
implements Dispatcher

Dispatches Events in a separate thread. Currently only single thread does that. Potentially there could be multiple channels for each event type class and a thread pool can be used to dispatch the events.

フィールドのサマリー

フィールド

修飾子とタイプ	フィールドと説明
protected Map<Class<? extends Enum>,EventHandler>	eventDispatchers

インタフェースから継承されたフィールド org.apache.hadoop.yarn.event.Dispatcher

DEFAULT_DISPATCHER_EXIT_ON_ERROR, DISPATCHER_EXIT_ON_ERROR_KEY

コンストラクタのサマリー

コンストラクタ

コンストラクタと説明
AsyncDispatcher()
AsyncDispatcher(BlockingQueue<Event> eventQueue)

メソッドのサマリー

修飾子とタイプ	メソッドと説明
protected void	dispatch(Event event)
EventHandler	getEventHandler()
protected boolean	isDrained()
protected boolean	isEventThreadWaiting()
void	register(Class<? extends Enum> eventType, EventHandler handler)
protected void	serviceInit(Configuration conf) All initialization code needed by a service.
protected void	serviceStart() Actions called during the INITED to STARTED transition.
protected void	serviceStop() Actions called during the transition to the STOPPED state.
void	setDrainEventsOnStop()

クラスから継承されたメソッド org.apache.hadoop.service.AbstractService

close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, noteFailure, putBlocker, registerGlobalListener, registerServiceListener, removeBlocker, setConfig, start, stop, toString, unregisterGlobalListener, unregisterServiceListener, waitForServiceToStop

クラスから継承されたメソッド java.lang.Object

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

フィールドの詳細

eventDispatchers

protected final Map<Class<? extends Enum>,EventHandler> eventDispatchers

コンストラクタの詳細

AsyncDispatcher

public AsyncDispatcher()

AsyncDispatcher

public AsyncDispatcher(BlockingQueue<Event> eventQueue)

メソッドの詳細

serviceInit

protected void serviceInit(Configuration conf)
                    throws Exception

クラスからコピーされた説明: AbstractService

All initialization code needed by a service. This method will only ever be called once during the lifecycle of a specific service instance. Implementations do not need to be synchronized as the logic in AbstractService.init(Configuration) prevents re-entrancy. The base implementation checks to see if the subclass has created a new configuration instance, and if so, updates the base class value

オーバーライド:

serviceInit クラス内 AbstractService

パラメータ:

conf - configuration

例外:

Exception - on a failure -these will be caught, possibly wrapped, and wil; trigger a service stop

serviceStart

protected void serviceStart()
                     throws Exception

クラスからコピーされた説明: AbstractService

Actions called during the INITED to STARTED transition. This method will only ever be called once during the lifecycle of a specific service instance. Implementations do not need to be synchronized as the logic in AbstractService.start() prevents re-entrancy.

オーバーライド:

serviceStart クラス内 AbstractService

例外:

Exception - if needed -these will be caught, wrapped, and trigger a service stop

setDrainEventsOnStop

public void setDrainEventsOnStop()

serviceStop

protected void serviceStop()
                    throws Exception

クラスからコピーされた説明: AbstractService

Actions called during the transition to the STOPPED state. This method will only ever be called once during the lifecycle of a specific service instance. Implementations do not need to be synchronized as the logic in AbstractService.stop() prevents re-entrancy. Implementations MUST write this to be robust against failures, including checks for null references -and for the first failure to not stop other attempts to shut down parts of the service.

オーバーライド:

serviceStop クラス内 AbstractService

例外:

Exception - if needed -these will be caught and logged.

dispatch

protected void dispatch(Event event)

register

public void register(Class<? extends Enum> eventType,
                     EventHandler handler)

定義:

register インタフェース内 Dispatcher

getEventHandler

public EventHandler getEventHandler()

定義:

getEventHandler インタフェース内 Dispatcher

isEventThreadWaiting

protected boolean isEventThreadWaiting()

isDrained

protected boolean isDrained()