Package org.apache.ignite.internal.processors.query.stat

Class StatisticsUtils

java.lang.Object

org.apache.ignite.internal.processors.query.stat.StatisticsUtils

public class StatisticsUtils
extends Object

Utilities to convert statistics from/to messages, validate configurations with statistics and so on.

Constructor Summary

Constructors

Constructor	Description
StatisticsUtils()

Method Summary

Modifier and Type	Method	Description
static int	compareVersions(StatisticsObjectConfiguration cfg, Map<String,Long> versions)	Test if secified statistics configuration is fit to all required versions.
static int	compareVersions(ObjectStatisticsImpl stat, Map<String,Long> versions)	Test if specified statistics are fit to all required versions.
static StatisticsTarget	statisticsTarget(StatisticsKeyMessage msg)	Create statistics target from statistics key message.
static ColumnStatistics	toColumnStatistics(GridKernalContext ctx, StatisticsColumnData data)	Convert statistics column data message to column statistics object.
static BigDecimal	toDecimal(Object obj)
static StatisticsKeyMessage	toMessage(String schema, String obj, String... colNames)	Build stats key message.
static StatisticsColumnData	toMessage(ColumnStatistics stat)	Convert ColumnStatistics to StaticColumnData message.
static StatisticsObjectData	toObjectData(StatisticsKeyMessage keyMsg, StatisticsType type, ObjectStatisticsImpl stat)	Build statistics object data from values.
static ObjectPartitionStatisticsImpl	toObjectPartitionStatistics(GridKernalContext ctx, StatisticsObjectData objData)	Convert StatsObjectData message to ObjectPartitionStatistics.
static ObjectStatisticsImpl	toObjectStatistics(GridKernalContext ctx, StatisticsObjectData data)	Convert statistics object data message to object statistics impl.

Methods inherited from class java.lang.Object

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

Constructor Detail

StatisticsUtils

public StatisticsUtils()

Method Detail

toMessage

public static StatisticsColumnData toMessage(ColumnStatistics stat)
                                      throws IgniteCheckedException

Convert ColumnStatistics to StaticColumnData message.

Parameters:

stat - Column statistics to convert.

Returns:

Converted stats column data message.

Throws:

IgniteCheckedException - In case of errors.

toColumnStatistics

public static ColumnStatistics toColumnStatistics(GridKernalContext ctx,
                                                  StatisticsColumnData data)

Convert statistics column data message to column statistics object.

Parameters:

ctx - Kernal context.

data - Statistics column data message to convert.

Returns:

ColumnStatistics object.

toObjectData

public static StatisticsObjectData toObjectData(StatisticsKeyMessage keyMsg,
                                                StatisticsType type,
                                                ObjectStatisticsImpl stat)
                                         throws IgniteCheckedException

Build statistics object data from values.

Parameters:

keyMsg - Statistics key.

type - Statistics type.

stat - Object statistics to convert.

Returns:

Converted StatsObjectData message.

Throws:

IgniteCheckedException - In case of errors.

toMessage

public static StatisticsKeyMessage toMessage(String schema,
                                             String obj,
                                             String... colNames)

Build stats key message.

Parameters:

schema - Schema name.

obj - Object name.

colNames - Column names or null.

Returns:

Statistics key message.

toObjectPartitionStatistics

public static ObjectPartitionStatisticsImpl toObjectPartitionStatistics(GridKernalContext ctx,
                                                                        StatisticsObjectData objData)
                                                                 throws IgniteCheckedException

Convert StatsObjectData message to ObjectPartitionStatistics.

Parameters:

ctx - Kernal context to use during conversion.

objData - StatsObjectData to convert.

Returns:

Converted ObjectPartitionStatistics.

Throws:

IgniteCheckedException - In case of errors.

toObjectStatistics

public static ObjectStatisticsImpl toObjectStatistics(GridKernalContext ctx,
                                                      StatisticsObjectData data)

Convert statistics object data message to object statistics impl.

Parameters:

ctx - Kernal context to use during conversion.

data - Statistics object data message to convert.

Returns:

Converted object statistics.

statisticsTarget

public static StatisticsTarget statisticsTarget(StatisticsKeyMessage msg)

Create statistics target from statistics key message.

Parameters:

msg - Source statistics key message;

Returns:

StatisticsTarget.

compareVersions

public static int compareVersions(ObjectStatisticsImpl stat,
                                  Map<String,Long> versions)

Test if specified statistics are fit to all required versions. It means that specified statistics contains all columns with at least versions from specified map.

Parameters:

stat - Statistics to check. Can be null.

versions - Map of column name to required version.

Returns:

positive value if statistics versions bigger than specified in versions map, negative value if statistics version smaller than specified in version map, zero it they are equals.

compareVersions

public static int compareVersions(StatisticsObjectConfiguration cfg,
                                  Map<String,Long> versions)

Test if secified statistics configuration is fit to all required versions. It means that specified statistics configuraion contains all columns with at least versions from specified map.

Parameters:

cfg - Statistics configuraion to check. Can be null.

versions - Map of column name to required version.

Returns:

true if it is, talse otherwise.

toDecimal

public static BigDecimal toDecimal(Object obj)