com.yahoo.bullet.querying.aggregations.grouping

Class CachingGroupData

java.lang.Object

com.yahoo.bullet.querying.aggregations.grouping.GroupData

com.yahoo.bullet.querying.aggregations.grouping.CachingGroupData

All Implemented Interfaces:

Serializable

public class CachingGroupData
extends GroupData

This class exists to optimize how the GroupDataSummary updates the summary for each record update. It stores a partialCopy of the BulletRecord so that the existing GroupData in the summary can just GroupData.consume(BulletRecord) it. It also can only be initialized with already created group fields, field aliases, and metrics. This helps us not have to keep recreating group fields, fields aliases, and metrics for every single record.

See Also:

Serialized Form

Field Summary

Fields inherited from class com.yahoo.bullet.querying.aggregations.grouping.GroupData

fieldAliases, groupFields, metrics

Constructor Summary

Constructors

Constructor and Description
CachingGroupData(Map<String,String> groupFields, Map<String,String> fieldAliases, Map<GroupOperation,Number> metrics) Constructor that initializes the CachingGroupData with an existing Map of GroupOperation to values and a Map of Strings that represent the group fields.

Method Summary

Modifier and Type	Method and Description
static CachingGroupData	copy(GroupData other) Creates a full copy of another GroupData.
CachingGroupData	partialCopy() Creates a partial copy of itself.

Methods inherited from class com.yahoo.bullet.querying.aggregations.grouping.GroupData

combine, combine, consume, getAsBulletRecord, getAsBulletRecord, getMetricsAsBulletRecord, getResultName, makeInitialMetrics

Methods inherited from class java.lang.Object

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

Constructor Detail

CachingGroupData

public CachingGroupData(Map<String,String> groupFields,
                        Map<String,String> fieldAliases,
                        Map<GroupOperation,Number> metrics)

Constructor that initializes the CachingGroupData with an existing Map of GroupOperation to values and a Map of Strings that represent the group fields. These arguments are not copied.

Parameters:

groupFields - The mappings of field names to their values that represent this group.

fieldAliases - The mappings of field names to their new names.

metrics - the non-null Map of metrics for this object.

Method Detail

partialCopy

public CachingGroupData partialCopy()

Creates a partial copy of itself. Only the metrics are copied, not the group.

Returns:

A copied CachingGroupData.

copy

public static CachingGroupData copy(GroupData other)

Creates a full copy of another GroupData.

Parameters:

other - The other GroupData to copy. If not-null, must have groups and metrics.

Returns:

A CachingGroupData copy of the GroupData or null if it was null.