org.apache.lens.server.api.driver.hooks

Class NoOpDriverQueryHook

java.lang.Object

org.apache.lens.server.api.driver.hooks.NoOpDriverQueryHook

All Implemented Interfaces:

DriverQueryHook

Direct Known Subclasses:

ChainedDriverQueryHook, QueryCostBasedQueryHook, UserBasedQueryHook

public class NoOpDriverQueryHook
extends Object
implements DriverQueryHook

Constructor Summary

Constructors

Constructor and Description
NoOpDriverQueryHook()

Method Summary

Modifier and Type	Method and Description
LensDriver	getDriver()
void	postDriverSelection(AbstractQueryContext ctx) Called just after driver has been selected to execute a query.
void	postEstimate(AbstractQueryContext ctx) Called just after a successful estimate operation is tried on this driver
void	postRewrite(AbstractQueryContext ctx) Called just after a successful rewrite operation is tried on this driver
void	preEstimate(AbstractQueryContext ctx) Called just before estimate operation is tried on this driver Note : Estimate operation will be skipped if rewrite operation fails for this driver
void	preLaunch(QueryContext ctx) Called just before launching the query on the selected driver.
void	preRewrite(AbstractQueryContext ctx) Called just before rewrite operation is tried on this driver
void	setDriver(LensDriver driver) This setter method is called by the driver once hook instance is created.

Methods inherited from class java.lang.Object

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

Constructor Detail

NoOpDriverQueryHook

public NoOpDriverQueryHook()

Method Detail

setDriver

public void setDriver(LensDriver driver)

Description copied from interface: DriverQueryHook

This setter method is called by the driver once hook instance is created. This driver information can be used while extracting driver specific information form the QueryContext.

Specified by:

setDriver in interface DriverQueryHook

preRewrite

public void preRewrite(AbstractQueryContext ctx)
                throws LensException

Description copied from interface: DriverQueryHook

Called just before rewrite operation is tried on this driver

Specified by:

preRewrite in interface DriverQueryHook

Throws:

LensException

postRewrite

public void postRewrite(AbstractQueryContext ctx)
                 throws LensException

Description copied from interface: DriverQueryHook

Called just after a successful rewrite operation is tried on this driver

Specified by:

postRewrite in interface DriverQueryHook

Throws:

LensException

preEstimate

public void preEstimate(AbstractQueryContext ctx)
                 throws LensException

Description copied from interface: DriverQueryHook

Called just before estimate operation is tried on this driver Note : Estimate operation will be skipped if rewrite operation fails for this driver

Specified by:

preEstimate in interface DriverQueryHook

Throws:

LensException

postEstimate

public void postEstimate(AbstractQueryContext ctx)
                  throws LensException

Description copied from interface: DriverQueryHook

Called just after a successful estimate operation is tried on this driver

Specified by:

postEstimate in interface DriverQueryHook

Throws:

LensException

postDriverSelection

public void postDriverSelection(AbstractQueryContext ctx)
                         throws LensException

Description copied from interface: DriverQueryHook

Called just after driver has been selected to execute a query.

Specified by:

postDriverSelection in interface DriverQueryHook

Throws:

LensException

preLaunch

public void preLaunch(QueryContext ctx)
               throws LensException

Description copied from interface: DriverQueryHook

Called just before launching the query on the selected driver.

Specified by:

preLaunch in interface DriverQueryHook

Throws:

LensException

getDriver

@Generated(value="lombok")
public LensDriver getDriver()