com.yahoo.bard.webservice.table.resolver

Class VolatileTimeComparator

java.lang.Object

com.yahoo.bard.webservice.table.resolver.VolatileTimeComparator

All Implemented Interfaces:

Comparator<PhysicalTable>

public class VolatileTimeComparator
extends Object
implements Comparator<PhysicalTable>

Comparator that prefers tables that contain more data in volatile requested intervals.

Constructor Summary

Constructors

Constructor and Description
VolatileTimeComparator(QueryPlanningConstraint requestConstraint, PartialDataHandler partialDataHandler, VolatileIntervalsService volatileIntervalsService) Builds a table comparator that compares tables based on how much data there is in their volatile intervals.

Method Summary

Modifier and Type	Method and Description
int	compare(PhysicalTable left, PhysicalTable right) Performs a comparison based on how much data each table has within their volatile intervals.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

VolatileTimeComparator

public VolatileTimeComparator(QueryPlanningConstraint requestConstraint,
                              PartialDataHandler partialDataHandler,
                              VolatileIntervalsService volatileIntervalsService)

Builds a table comparator that compares tables based on how much data there is in their volatile intervals.

Parameters:

requestConstraint - Contains the request constraints extracted from DataApiRequest and TemplateDruidQuery

partialDataHandler - A service for computing partial data information

volatileIntervalsService - A service to extract the intervals in a query that are volatile with respect to a given table

Method Detail

compare

public int compare(PhysicalTable left,
                   PhysicalTable right)

Performs a comparison based on how much data each table has within their volatile intervals.

Specified by:

compare in interface Comparator<PhysicalTable>

Parameters:

left - The first table

right - The second table

Returns:

negative if left has more data in its volatile segment than right