io.druid.query

Class TimewarpOperator<T>

java.lang.Object

io.druid.query.TimewarpOperator<T>

All Implemented Interfaces:

PostProcessingOperator<T>

public class TimewarpOperator<T>
extends Object
implements PostProcessingOperator<T>

TimewarpOperator is an example post-processing operator that maps current time to the latest period ending withing the specified data interval and truncates the query interval to discard data that would be mapped to the future.

Constructor Summary

Constructors

Constructor and Description
TimewarpOperator(org.joda.time.Interval dataInterval, org.joda.time.Period period, org.joda.time.DateTime origin)

Method Summary

Modifier and Type	Method and Description
protected long	computeOffset(long t) Map time t into the last `period` ending within `dataInterval`
QueryRunner<T>	postProcess(QueryRunner<T> baseQueryRunner)
QueryRunner<T>	postProcess(QueryRunner<T> baseRunner, long now)

Methods inherited from class java.lang.Object

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

Constructor Detail

TimewarpOperator

public TimewarpOperator(org.joda.time.Interval dataInterval,
                        org.joda.time.Period period,
                        org.joda.time.DateTime origin)

Parameters:

dataInterval - interval containing the actual data

period - time will be offset by a multiple of the given period until there is at least a full period ending within the data interval

origin - origin to be used to align time periods (e.g. to determine on what day of the week a weekly period starts)

Method Detail

postProcess

public QueryRunner<T> postProcess(QueryRunner<T> baseQueryRunner)

Specified by:

postProcess in interface PostProcessingOperator<T>

postProcess

public QueryRunner<T> postProcess(QueryRunner<T> baseRunner,
                                  long now)

computeOffset

protected long computeOffset(long t)

Map time t into the last `period` ending within `dataInterval`

Parameters:

t - the current time to be mapped into `dataInterval`

Returns:

the offset between the mapped time and time t