com.networknt.eventuate.common

Interface SnapshotStrategy

public interface SnapshotStrategy

A strategy for creating snapshots of a

Method Summary

Modifier and Type	Method and Description
Class<?>	getAggregateClass() The aggregate class that this is a strategy for
Optional<Snapshot>	possiblySnapshot(Aggregate aggregate, Optional<Int128> snapshotVersion, List<EventWithMetadata> oldEvents, List<Event> newEvents) Possibly generate a snapshot
Aggregate	recreateAggregate(Class<?> clasz, Snapshot snapshot, MissingApplyEventMethodStrategy missingApplyEventMethodStrategy) Recreate an aggregate from a snapshot

Method Detail

getAggregateClass

Class<?> getAggregateClass()

The aggregate class that this is a strategy for

Returns:

the aggregate class

possiblySnapshot

Optional<Snapshot> possiblySnapshot(Aggregate aggregate,
                                    Optional<Int128> snapshotVersion,
                                    List<EventWithMetadata> oldEvents,
                                    List<Event> newEvents)

Possibly generate a snapshot

Parameters:

aggregate - - the updated aggregate

snapshotVersion - - the version of the snapshot, if any, that the aggregate was created from

oldEvents - - the old events that were used to recreate the aggregate

newEvents - - the new events generated as a result of executing a command

Returns:

an optional snapshot

recreateAggregate

Aggregate recreateAggregate(Class<?> clasz,
                            Snapshot snapshot,
                            MissingApplyEventMethodStrategy missingApplyEventMethodStrategy)

Recreate an aggregate from a snapshot

Parameters:

clasz - the aggregate class

snapshot - the snapshot

missingApplyEventMethodStrategy - missing apply event method strategy

Returns:

the aggregate