Package org.apache.iotdb.db.queryengine.execution.driver

Class DataDriver

java.lang.Object

org.apache.iotdb.db.queryengine.execution.driver.Driver

org.apache.iotdb.db.queryengine.execution.driver.DataDriver

All Implemented Interfaces:

IDriver

@NotThreadSafe
public class DataDriver
extends Driver

One DataDriver is responsible for one FragmentInstance which is for data query, which may contains several series.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.iotdb.db.queryengine.execution.driver.Driver

Driver.State

Field Summary

Fields inherited from class org.apache.iotdb.db.queryengine.execution.driver.Driver

driverBlockedFuture, driverContext, exclusiveLock, LOGGER, QUERY_EXECUTION_METRICS, QUERY_METRICS, root, sink, state

Constructor Summary

Constructors

Constructor	Description
DataDriver(Operator root, DriverContext driverContext, long estimatedMemorySize)

Method Summary

Modifier and Type	Method	Description
long	getEstimatedMemorySize()
protected boolean	init(com.google.common.util.concurrent.SettableFuture<?> blockedFuture)	do initialization.
protected void	releaseResource()	release resource this driver used.

Methods inherited from class org.apache.iotdb.db.queryengine.execution.driver.Driver

close, failed, getDriverContext, getDriverTaskId, getSink, isFinished, isHighestPriority, processFor, setDriverTaskId, setHighestPriority

Methods inherited from class java.lang.Object

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

Constructor Details

DataDriver

public DataDriver(Operator root,
 DriverContext driverContext,
 long estimatedMemorySize)

Method Details

init

protected boolean init(com.google.common.util.concurrent.SettableFuture<?> blockedFuture)

Description copied from class: Driver

do initialization.

Specified by:

init in class Driver

Returns:

true if init succeed, false otherwise

releaseResource

protected void releaseResource()

Description copied from class: Driver

release resource this driver used.

Specified by:

releaseResource in class Driver

getEstimatedMemorySize

public long getEstimatedMemorySize()