org.apache.iotdb.db.query.control

类 QueryTimeManager

java.lang.Object

org.apache.iotdb.db.query.control.QueryTimeManager

所有已实现的接口:

IService

public class QueryTimeManager
extends Object
implements IService

This class is used to monitor the executing time of each query. Once one is over the threshold, it will be killed and return the time out exception.

方法概要

限定符和类型	方法和说明
static boolean	checkQueryAlive(long queryId) Check given query is alive or not.
void	clear()
ServiceType	getID() Get the name of the the service.
static QueryTimeManager	getInstance()
QueryContext	getQueryContext(long queryId)
Map<Long,QueryContext>	getQueryContextMap()
void	killQuery(long queryId)
void	registerQuery(QueryContext context)
void	start() Start current service.
void	stop() Stop current service.
AtomicBoolean	unRegisterQuery(long queryId, boolean fullQuit) UnRegister query when query quits because of getting enough data or timeout.

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.iotdb.db.service.IService

shutdown, waitAndStop

方法详细资料

registerQuery

public void registerQuery(QueryContext context)

killQuery

public void killQuery(long queryId)

unRegisterQuery

public AtomicBoolean unRegisterQuery(long queryId,
                                     boolean fullQuit)

UnRegister query when query quits because of getting enough data or timeout. If getting enough data, we only remove the timeout task. If the query is full quit because of timeout or EndQuery(), we remove them all.

参数:

fullQuit - True if timeout or endQuery()

checkQueryAlive

public static boolean checkQueryAlive(long queryId)

Check given query is alive or not. We only throw the queryTimeoutRunTimeException once. If the runTimeException is thrown in main thread, it will quit directly while the return value will be used to ask sub query threads to quit. Else if it's thrown in one sub thread, other sub threads will quit by reading the return value, and main thread will catch and throw the same exception by reading the ExceptionBatchData.

返回:

True if alive.

getQueryContextMap

public Map<Long,QueryContext> getQueryContextMap()

clear

public void clear()

getQueryContext

public QueryContext getQueryContext(long queryId)

getInstance

public static QueryTimeManager getInstance()

start

public void start()

从接口复制的说明: IService

Start current service.

指定者:

start 在接口中 IService

stop

public void stop()

从接口复制的说明: IService

Stop current service. If current service uses thread or thread pool, current service should guarantee to putBack thread or thread pool.

指定者:

stop 在接口中 IService

getID

public ServiceType getID()

从接口复制的说明: IService

Get the name of the the service.

指定者:

getID 在接口中 IService

返回:

current service name