Package org.apache.iotdb.db.query.control

Class QueryTimeManager

java.lang.Object

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

All Implemented Interfaces:

org.apache.iotdb.commons.service.IService

public class QueryTimeManager
extends java.lang.Object
implements org.apache.iotdb.commons.service.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.

Method Summary

Modifier and Type	Method	Description
static boolean	checkQueryAlive(long queryId)	Check given query is alive or not.
void	clear()
org.apache.iotdb.commons.service.ServiceType	getID()
static QueryTimeManager	getInstance()
QueryContext	getQueryContext(long queryId)
java.util.Map<java.lang.Long,QueryContext>	getQueryContextMap()
void	killQuery(long queryId)
void	registerQuery(QueryContext context)
void	start()
void	stop()
java.util.concurrent.atomic.AtomicBoolean	unRegisterQuery(long queryId, boolean fullQuit)	UnRegister query when query quits because of getting enough data or timeout.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.iotdb.commons.service.IService

shutdown, waitAndStop

Method Detail

registerQuery

public void registerQuery(QueryContext context)

killQuery

public void killQuery(long queryId)

unRegisterQuery

public java.util.concurrent.atomic.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.

Parameters:

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.

Returns:

True if alive.

getQueryContextMap

public java.util.Map<java.lang.Long,QueryContext> getQueryContextMap()

clear

public void clear()

getQueryContext

public QueryContext getQueryContext(long queryId)

getInstance

public static QueryTimeManager getInstance()

start

public void start()

Specified by:

start in interface org.apache.iotdb.commons.service.IService

stop

public void stop()

Specified by:

stop in interface org.apache.iotdb.commons.service.IService

getID

public org.apache.iotdb.commons.service.ServiceType getID()

Specified by:

getID in interface org.apache.iotdb.commons.service.IService