com.netflix.hollow.tools.history

Class HollowHistoricalStateCreator

java.lang.Object

com.netflix.hollow.tools.history.HollowHistoricalStateCreator

public class HollowHistoricalStateCreator
extends java.lang.Object

Used to create a historical HollowDataAccess, even in the absence of a HollowHistory.

Constructor Summary

Constructors

Constructor and Description
HollowHistoricalStateCreator()
HollowHistoricalStateCreator(HollowHistory totalHistory)

Method Summary

Modifier and Type	Method and Description
HollowHistoricalStateDataAccess	copyButRemapOrdinals(HollowHistoricalStateDataAccess previous, OrdinalRemapper ordinalRemapper)
HollowHistoricalStateDataAccess	createBasedOnNewDelta(long version, HollowReadStateEngine stateEngine) Create a HollowDataAccess for the prior state of the supplied HollowReadStateEngine after a delta has been applied.
HollowHistoricalStateDataAccess	createConsistentOrdinalHistoricalStateFromDoubleSnapshot(long version, HollowReadStateEngine previous) Create a HollowDataAccess for a HollowHistory.
HollowHistoricalStateDataAccess	createHistoricalStateFromDoubleSnapshot(long version, HollowReadStateEngine previous, HollowReadStateEngine current, DiffEqualityMappingOrdinalRemapper ordinalRemapper) Create a HollowDataAccess for a historical state after a double snapshot occurs, without a HollowHistory.

Methods inherited from class java.lang.Object

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

Constructor Detail

HollowHistoricalStateCreator

public HollowHistoricalStateCreator()

HollowHistoricalStateCreator

public HollowHistoricalStateCreator(HollowHistory totalHistory)

Method Detail

createBasedOnNewDelta

public HollowHistoricalStateDataAccess createBasedOnNewDelta(long version,
                                                             HollowReadStateEngine stateEngine)

Create a HollowDataAccess for the prior state of the supplied HollowReadStateEngine after a delta has been applied.

Parameters:

version - The state's version

stateEngine - The current HollowReadStateEngine to which a delta has been applied.

Returns:

a data access for history

createConsistentOrdinalHistoricalStateFromDoubleSnapshot

public HollowHistoricalStateDataAccess createConsistentOrdinalHistoricalStateFromDoubleSnapshot(long version,
                                                                                                HollowReadStateEngine previous)

Create a HollowDataAccess for a HollowHistory. Remap ordinal spaces for all prior historical versions in the HollowHistory for consistency.

Parameters:

version - the version

previous - the prior read state

Returns:

the data access for a history

createHistoricalStateFromDoubleSnapshot

public HollowHistoricalStateDataAccess createHistoricalStateFromDoubleSnapshot(long version,
                                                                               HollowReadStateEngine previous,
                                                                               HollowReadStateEngine current,
                                                                               DiffEqualityMappingOrdinalRemapper ordinalRemapper)

Create a HollowDataAccess for a historical state after a double snapshot occurs, without a HollowHistory.

Parameters:

version - the version

previous - the previous state

current - the current state

ordinalRemapper - the ordinal remapper

Returns:

the data access for a history

copyButRemapOrdinals

public HollowHistoricalStateDataAccess copyButRemapOrdinals(HollowHistoricalStateDataAccess previous,
                                                            OrdinalRemapper ordinalRemapper)