Europe Virtual ALT.NET - EventStore v3

Europe Virtual ALT.NET, 25 October 2011 Jonathan OliverUsing and Abusing

 Founder: SmartyStreets (smartystreets.com) Founder, co-host: Distributed Podcast Committer, NServiceBus & Autofac Project owner, CQRS EventStore

 Finances the EventStore project Started in 2006 (as Qualified Address) All your street address are belong to us My personal guinea pig Fully geo-distributed

 Messaging SOA DDD CQRS (strict definition) Event Sourcing CQRS Architecture

 Hand-crafted SQL and stored procedures Canonical data model Application integration via shared database Generated DAL

 Temporal database design Messaging Breakthrough—Putting DBs in their place Greg Young—InfoQ and DevTeach Videos

 Capturing business intent Rebuild state from events Rewind, pause, fast-forward Build alternate models Immutable data is crazy scalable Complete audit

 It’s not a framework—I hate frameworks It doesn’t permeate your code You can swap it out and/or build your own Nothing existed at the time—March 2009 Implementation reflects the developer

 Goal: technology is an implementation detail Transactions typically exist in SQL land Lots of interesting alternatives appearing Momentum around NoSQL increasing Two-phase commit virtually non-existent

 Absorbing transactions Cross-resource transactional consistency Commits Exposing a robust, easy-to-use model

“Repository” App / Service Layer Dispatcher / Bus EventStore“ISession” commit Event Stream commit“ISessionFactory” Event Store Pipeline Hooks“NHibernate Magic” Persistence Engine SerializerDisk, DB, Memory, etc. Durable Storage (Snapshotting and some advanced capabilities have been ommitted)

Transaction #1 Message Handler EventStore Async Dispatch Scheduler commit ack•Optimistic Concurrency• Idempotency/De-duplication DiskTransaction #2 Dispatch Messaging Wire Protocol Scheduler Technology Mark as dispatchedTransaction #3 EventStore Disk

 Streams vs. Aggregates Usage Example Implementation

 Pipes and filters Filter out, modify, up-convert Select, Precommit, and Postcommit Implementation

 Synchronous vs. Asynchronous Any bus, broker, or messaging technology Any serialization mechanism Production example Implementation

 XML, JSON/BSON, Protocol Buffers, Thrift, MessagePack, Avro Serialization pipeline Implementation

 The primary storage engine Easy to understand Great management tools Proven, mature implementation 10+ flavors (SQL Server, MySQL, SQLite, etc.) Code

 Easy alternative for .NET Great commercial support Great management tools Responsive community + Oren/Ayende Gotcha: 2PC and repeatable reads

 Highly robust engine Established as a primary NoSQL engine Lots of management tools Code

 CouchDB Amazon Azure Oracle Redis Cassandra .NET System.IO APIs

 Completely optional Avoiding additional dependencies Can use StructureMap, Autofac, Ninject, etc.

 Spike code that worked too well Simple, opinionated “DDDD” framework Purposefully minimalistic “Essence” to be merged into EventStore

Blog: blog.jonathanoliver.comTwitter jonathan_oliverGitHub github.com/joliver

Europe Virtual ALT.NET - EventStore v3

by Jonathan Oliver

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