eventium-core Changelog

0.2.1 (Unreleased)

Additions

• snapshotEventHandler -- EventHandler that auto-updates a VersionedProjectionCache on each event.
• snapshotGlobalEventHandler -- same for GlobalProjectionCache.
• applyCommandHandlerWithCache -- like applyCommandHandler but loads from cache and updates after write.
• Eventium.ReadModel module:
  • ReadModel record type for queryable persistent views driven by the global event stream.
  • runReadModel, rebuildReadModel, combineReadModels combinators.

0.2.0 (Unreleased)

See the root changelog for full details.

Breaking changes

• Record field prefixes removed from all core types. Fields accessed via OverloadedRecordDot (e.g. projection.seed, event.metadata). NoFieldSelectors and DuplicateRecordFields enabled as default extensions.
• StreamEvent now has 4 fields (added EventMetadata).
• CommandHandler gained an err type parameter; commandHandlerHandler renamed to decide.
• ProcessManager is now pure: react returns [ProcessManagerEffect]. ProcessManagerEffect only supports IssueCommand (removed EmitEvent).
• EventPublisher: removed synchronousEventBusWrapper; added publishingEventStoreWriter and synchronousPublisher.
• PollingPeriodSeconds (Double) replaced by PollingIntervalMillis (Int).
• Codec wrapper argument order changed (codec comes first).
• Removed Eventium.ReadModel.Memory.

Internal

• Absorbed x-sum-type-boilerplate into Eventium.TH.SumType.
• Dropped persistent-template dependency.

Additions

• Eventium.TH.SumType module: constructSumType, sumTypeConverter, partialSumTypeConverter (previously from x-sum-type-boilerplate).
• NoFieldSelectors, DuplicateRecordFields, OverloadedRecordDot default extensions.
• EventMetadata, emptyMetadata.
• lenientCodecEventStoreReader, lenientCodecProjection.
• runProjectionSubscription, eventHandlerMapMaybe.
• CommandDispatcher newtype with mkCommandDispatcher and fireAndForgetDispatcher.
• CommandDispatchResult (CommandSucceeded | CommandFailed Text).
• IssueCommandWithCompensation effect for saga compensation workflows.
• processManagerEventHandler for wiring a ProcessManager to an EventHandler.
• Eventium.CommandDispatcher module: AggregateHandler, mkAggregateHandler, commandHandlerDispatcher for list-based multi-aggregate command routing.
• embeddedCommandHandler returns Right [] for non-matching commands (was DecodeError exception).

0.1.0

Initial release.