Release Notes 0.5.0

Eventsourced is a library that adds scalable actor state persistence and at-least-once message delivery guarantees to Akka. Its relation to event-sourcing is described here.

Documentation

• Installation
• User guide
  • Overview
  • First steps
  • Examples
• API docs
• Reference application

Mailing lists

• eventsourced
• eventsourced-dev

Repositories

• Releases repository
• Snapshots repository

Changes

Since 0.5-M2

Snapshots:

• Snapshotting is currently supported by the following journals (others to follow in upcoming releases)
  • HBase journal: saves snapshots to a configurable Hadoop FileSystem
  • LevelDB journal: saves snapshots to the local filesystem
  • Journal.IO journal: saves snapshots to the local filesystem
  • In-memory journal: keeps snapshots in-memory only
• Redesigned recovery API to include snapshot-based recovery.

Journals:

• New MongoDB journal using the ReactiveMongo driver
• Throttled replay discontinued for LevelDB journal (#87)

Channels:

• Standalone channel usage

Bug fixes:

• Erroneous sequence number recovery with Journal.IO journal (#95)
• Erroneous sequence number recovery with HBase journal (#74)

Since 0.5-M1

Journals:

• New journals (fully functional but not sufficiently tested yet for production use)
  • DynamoDB journal
  • HBase journal
  • MongoDB journal (using Casbah)
• Journal implementation support further extended
  • AsynchronousWriteReplaySupport. Support trait for journals that make concurrent, asynchronous writes to the storage backend. Usually implemented by journals that communicate with a distributed datastore.
  • SynchronousWriteReplaySupport. Support trait for journals that make sequential, synchronous writes to the storage backend. Mainly used with local storage backends that do not provide an asynchronous API.

Channels:

• New reliable request-reply channel and usage example
• Reliable channel enhancements
  • Sender references are now persisted (#50)
  • Redelivery policy enhancements (#39)

Message:

• timestamp field added and set by journal for input messages (#54)

Project:

• Eventsourced is now a multi-module project (#29)
• Target JVM version set to 1.6 (#38)
• Upgrades
  • Scala 2.10.1
  • Akka 2.1.2
  • Journal.IO 1.3
  • leveldbjni 1.6

Bug fixes:

• Redelivery counter of reliable channel not reset on confirmation (#45)
• Restart counter of reliable channel not reset on successful delivery (#51)
• Sequence-structured LevelDB journal recovery/replay doesn't work properly (#48)

Since 0.4.1

Journals:

• Journal config APIs
  • LeveldbJournalProps
  • JournalioJournalProps
• Throttled replay (LevelDB journal only)
• LeveldbJournal now running on Windows too (#23)

Processors and channels:

• Channel config API extensions
  • ReliableChannelProps (incl. more redelivery options)
  • DefaultChannelProps
• Automatically deregister stopped processors and channels from EventsourcingExtension

Message:

• senderMessageId field removed from Message (#44, see also idempotency)

Misc:

• Custom serialization
• Non-blocking recovery

Project:

• OSGi metadata (#34)
• Upgrades
  • Scala 2.10.0
  • Akka 2.1.0
• Further examples
  • Eventsourced state machines
  • Eventsourced actor clustering
• Documentation
  • User guide enhancements
  • FAQ page started

Contributors

• 2beaucoup (documentation fixes)
• Alex Henning Johannessen (preparation work for a project site, documentation fixes)
• Dmitry Kulikov (build enhancements, fix compiler warnings, code cleanup)
• Duncan DeVore (MongoDB Casbah journal, MongoDB Reactive journal)
• Raman Gupta (configurable dispatchers for journals, OSGi metadata)
• Scott Clasen (DynamoDB journal)
• Stig Brautaset (documentation fixes)
• Valerian (documentation fixes)

Many thanks to all contributors!