Package com.illumon.iris.db.v2.snapshot

Class SnapshotUtils

java.lang.Object

com.illumon.iris.db.v2.snapshot.SnapshotUtils

public class SnapshotUtils
extends Object

Constructor Summary

Constructors

Constructor	Description
SnapshotUtils()

Method Summary

Modifier and Type	Method	Description
static void	copyDataColumns(Map<String,? extends ChunkSource.WithPrev> srcColumns, Index srcIndex, Map<String,? extends WritableSource> destColumns, Index destIndex, boolean usePrev)	For each name in srcColumns, copy all the data at srcColumns.get(name) (with a range of rows defined by srcIndex) to a column indicated by destColumns.get(name) (with a range of rows defined by destIndex).
static void	copyStampColumns(Map<String,? extends ColumnSource> stampColumns, long stampKey, Map<String,? extends WritableSource> destColumns, long destKey)	Like the above, but with a singleton destination.
static void	copyStampColumns(Map<String,? extends ColumnSource> stampColumns, long stampKey, Map<String,? extends WritableSource> destColumns, Index destIndex)	For each name in stampColumns: - identify a stamp source (namely 'stampColumns.get(name)') - a row in that stamp source (namely 'stampKey') - a stamp dest (namely the column identified by 'destColumns.get(name)') - a bunch of destination rows (namely all the rows defined in 'destIndex') Then "spray" that single source value over those destination values.
static <T> Map<String,T>	createColumnSourceMap(Map<String,? extends ColumnSource> columns, BiFunction<Class,Class,T> factory)	Creates a new columnSourceMap based on 'columns'.

Methods inherited from class java.lang.Object

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

Constructor Details

SnapshotUtils

public SnapshotUtils()

Method Details

createColumnSourceMap

public static <T> Map<String,T> createColumnSourceMap(Map<String,? extends ColumnSource> columns, BiFunction<Class,Class,T> factory)

Creates a new columnSourceMap based on 'columns'.

copyStampColumns

public static void copyStampColumns(@NotNull Map<String,? extends ColumnSource> stampColumns, long stampKey, @NotNull Map<String,? extends WritableSource> destColumns, @NotNull Index destIndex)

For each name in stampColumns: - identify a stamp source (namely 'stampColumns.get(name)') - a row in that stamp source (namely 'stampKey') - a stamp dest (namely the column identified by 'destColumns.get(name)') - a bunch of destination rows (namely all the rows defined in 'destIndex') Then "spray" that single source value over those destination values.

Parameters:

stampColumns - The stamp columns that serve as the source data

stampKey - The source key

destColumns - The destination columns we are "spraying" to

destIndex - The keys in destColumns we want to write to

copyStampColumns

public static void copyStampColumns(@NotNull Map<String,? extends ColumnSource> stampColumns, long stampKey, @NotNull Map<String,? extends WritableSource> destColumns, long destKey)

Like the above, but with a singleton destination. For each name in stampColumns: - identify a stamp source (namely 'stampColumns.get(name)') - a row in that stamp source (namely 'stampKey') - a stamp dest (namely the column identified by 'destColumns.get(name)') - a row in the destination (namely 'destKey') Then copy the source value to the destination value.

Parameters:

stampColumns - The stamp columns that serve as the source data

stampKey - The source key

destColumns - The destination columns we are writing to to

destKey - The key in destColumns we want to write to

copyDataColumns

public static void copyDataColumns(@NotNull Map<String,? extends ChunkSource.WithPrev> srcColumns, @NotNull Index srcIndex, @NotNull Map<String,? extends WritableSource> destColumns, @NotNull Index destIndex, boolean usePrev)

For each name in srcColumns, copy all the data at srcColumns.get(name) (with a range of rows defined by srcIndex) to a column indicated by destColumns.get(name) (with a range of rows defined by destIndex).

Parameters:

srcColumns - The stamp columns that serve as the source data

srcIndex - The keys in the srcColumns we are reading from

destColumns - The destination columns we are writing to

destIndex - The keys in destColumns we want to write to