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

Class Driver

java.lang.Object

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

All Implemented Interfaces:

IDriver

Direct Known Subclasses:

DataDriver, SchemaDriver

public abstract class Driver
extends java.lang.Object
implements IDriver

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	Driver.State

Field Summary

Fields

Modifier and Type	Field	Description
protected java.util.concurrent.atomic.AtomicReference<com.google.common.util.concurrent.SettableFuture<?>>	driverBlockedFuture
protected DriverContext	driverContext
protected org.apache.iotdb.db.mpp.execution.driver.Driver.DriverLock	exclusiveLock
protected static org.slf4j.Logger	LOGGER
protected Operator	root
protected ISinkHandle	sinkHandle
protected java.util.concurrent.atomic.AtomicReference<Driver.State>	state

Constructor Summary

Constructors

Constructor	Description
Driver(Operator root, ISinkHandle sinkHandle, DriverContext driverContext)

Method Summary

Modifier and Type	Method	Description
void	close()	clear resource used by this fragment instance
void	failed(java.lang.Throwable t)	fail current driver
FragmentInstanceId	getInfo()	the id information about this IDriver.
ISinkHandle	getSinkHandle()
protected abstract boolean	init(com.google.common.util.concurrent.SettableFuture<?> blockedFuture)	do initialization
boolean	isFinished()	Used to judge whether this IDriver should be scheduled for execution anymore
com.google.common.util.concurrent.ListenableFuture<?>	processFor(io.airlift.units.Duration duration)	run the IDriver for {@param duration} time slice, the time of this run is likely not to be equal to {@param duration}, the actual run time should be calculated by the caller
protected abstract void	releaseResource()	release resource this driver used

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

protected static final org.slf4j.Logger LOGGER

root

protected final Operator root

sinkHandle

protected final ISinkHandle sinkHandle

driverContext

protected final DriverContext driverContext

driverBlockedFuture

protected final java.util.concurrent.atomic.AtomicReference<com.google.common.util.concurrent.SettableFuture<?>> driverBlockedFuture

state

protected final java.util.concurrent.atomic.AtomicReference<Driver.State> state

exclusiveLock

protected final org.apache.iotdb.db.mpp.execution.driver.Driver.DriverLock exclusiveLock

Constructor Detail

Driver

public Driver(Operator root,
              ISinkHandle sinkHandle,
              DriverContext driverContext)

Method Detail

isFinished

public boolean isFinished()

Description copied from interface: IDriver

Used to judge whether this IDriver should be scheduled for execution anymore

Specified by:

isFinished in interface IDriver

Returns:

true if the IDriver is done or terminated due to failure, otherwise false.

init

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

do initialization

Returns:

true if init succeed, false otherwise

releaseResource

protected abstract void releaseResource()

release resource this driver used

processFor

public com.google.common.util.concurrent.ListenableFuture<?> processFor(io.airlift.units.Duration duration)

Description copied from interface: IDriver

run the IDriver for {@param duration} time slice, the time of this run is likely not to be equal to {@param duration}, the actual run time should be calculated by the caller

Specified by:

processFor in interface IDriver

Parameters:

duration - how long should this IDriver run

Returns:

the returned ListenableFuture is used to represent status of this processing if isDone() return true, meaning that this IDriver is not blocked and is ready for next processing. Otherwise, meaning that this IDriver is blocked and not ready for next processing.

getInfo

public FragmentInstanceId getInfo()

Description copied from interface: IDriver

the id information about this IDriver.

Specified by:

getInfo in interface IDriver

Returns:

a FragmentInstanceId instance.

close

public void close()

Description copied from interface: IDriver

clear resource used by this fragment instance

Specified by:

close in interface IDriver

failed

public void failed(java.lang.Throwable t)

Description copied from interface: IDriver

fail current driver

Specified by:

failed in interface IDriver

Parameters:

t - reason cause this failure

getSinkHandle

public ISinkHandle getSinkHandle()

Specified by:

getSinkHandle in interface IDriver

Returns:

get SinkHandle of current IDriver