Ismael Celis
@ismaelcelis.com
really good series on durable execution and workflows jack-vanlightly.com/blog/2025/6/...
Coordinated Progress – Part 1 – Seeing the System: The Graph — Jack Vanlightly
At some point, we’ve all sat in an architecture meeting where someone asks, “ Should this be an event? An RPC? A queue? ”, or “ How do we tie this process together across our microservices? Should it ...
jack-vanlightly.com
November 25, 2025 at 11:47 AM
really good series on durable execution and workflows jack-vanlightly.com/blog/2025/6/...
“Papá, yo ya sabo hablar español!”
November 24, 2025 at 6:14 PM
“Papá, yo ya sabo hablar español!”
This 👇
The moment when you have to name the fact that actually happens opens a magic box in your head that unveils edge cases, impacts on other parts of the system, or unknowns that you have to ask the client. It really changes the way you think and communicates with others.
dudulski.pl/2025/11/23/w...
dudulski.pl/2025/11/23/w...
~/When Event Sourcing clicked for me
Jan Dudulski personal site
dudulski.pl
November 23, 2025 at 6:28 PM
This 👇
If you’re just learning about Event Sourcing, you’ll come across the concept of an “aggregate root” (or you might already know it from DDD). This will lead you down the wrong mental model and only cause confusion. Luckily, the core ideas being masked by aggregates are rather simple!
November 21, 2025 at 2:17 PM
If you’re just learning about Event Sourcing, you’ll come across the concept of an “aggregate root” (or you might already know it from DDD). This will lead you down the wrong mental model and only cause confusion. Luckily, the core ideas being masked by aggregates are rather simple!
The Arazzo spec, for describing API workflows, looks interesting spec.openapis.org/arazzo/lates...
The Arazzo Specification v1.0.1
The Arazzo Specification provides a mechanism that can define sequences of calls and their dependencies to be woven together and expressed in the context of delivering a particular outcome or set of o...
spec.openapis.org
November 21, 2025 at 12:43 PM
The Arazzo spec, for describing API workflows, looks interesting spec.openapis.org/arazzo/lates...
I did a two-day introduction to Event Sourcing and Event Modelling workshop at a UK bank and… I think it went well?
November 20, 2025 at 8:57 PM
I did a two-day introduction to Event Sourcing and Event Modelling workshop at a UK bank and… I think it went well?
Quite a few messaging/event-sourcing toolkits treat the ability to re-play events as an edge case and leave implementation mostly up to you (and it's the hardest part!). But the underlying property is the ability to have autonomous components, which IMO is the killer feature.
November 18, 2025 at 1:07 PM
Quite a few messaging/event-sourcing toolkits treat the ability to re-play events as an edge case and leave implementation mostly up to you (and it's the hardest part!). But the underlying property is the ability to have autonomous components, which IMO is the killer feature.
Optimising Sourced's real-time connections
November 18, 2025 at 9:58 AM
Optimising Sourced's real-time connections
Cohesion: "things that change together, go together"
Procedural cohesion: "things that form part of the same workflow, go together".
Logical cohesion: "things that implement the same technical pattern, go together".
The last one makes the most initial sense, but provides the least value.
Procedural cohesion: "things that form part of the same workflow, go together".
Logical cohesion: "things that implement the same technical pattern, go together".
The last one makes the most initial sense, but provides the least value.
November 17, 2025 at 5:59 PM
Cohesion: "things that change together, go together"
Procedural cohesion: "things that form part of the same workflow, go together".
Logical cohesion: "things that implement the same technical pattern, go together".
The last one makes the most initial sense, but provides the least value.
Procedural cohesion: "things that form part of the same workflow, go together".
Logical cohesion: "things that implement the same technical pattern, go together".
The last one makes the most initial sense, but provides the least value.
“Dad, why would anyone want to have an EATEN MESS for pudding?!”
November 15, 2025 at 1:11 PM
“Dad, why would anyone want to have an EATEN MESS for pudding?!”
Health-wise, I’m pretty sure the haggis and the black pudding in this breakfast cancel each other out.
November 14, 2025 at 10:16 AM
Health-wise, I’m pretty sure the haggis and the black pudding in this breakfast cancel each other out.
The English countryside is lovely but it always strikes me as missing something at first, and then I realise it’s the looming mountains all around I grew up with.
November 13, 2025 at 11:22 AM
The English countryside is lovely but it always strikes me as missing something at first, and then I realise it’s the looming mountains all around I grew up with.
On my way to Edinburgh for this evening’s Durable Messaging in Ruby talk at ScotRUG
November 13, 2025 at 10:55 AM
On my way to Edinburgh for this evening’s Durable Messaging in Ruby talk at ScotRUG
Good talk on eventual consistency www.youtube.com/watch?v=8ybq...
Keynote: You Keep Using That Word - Sam Newman | MQ Summit 2025
YouTube video by Code Sync
www.youtube.com
November 12, 2025 at 3:29 PM
Good talk on eventual consistency www.youtube.com/watch?v=8ybq...
Reposted by Ismael Celis
🌸 Hanami 2.3 is here, and it’s racked and ready!
This is our biggest release yet. Rack 3, resource routes, and so much more.
hanamirb.org/blog/2025/11...
This is our biggest release yet. Rack 3, resource routes, and so much more.
hanamirb.org/blog/2025/11...
Hanami 2.3: Racked and Ready
Our biggest release yet. Rack 3, resource routes, and so much more.
hanamirb.org
November 12, 2025 at 1:20 PM
🌸 Hanami 2.3 is here, and it’s racked and ready!
This is our biggest release yet. Rack 3, resource routes, and so much more.
hanamirb.org/blog/2025/11...
This is our biggest release yet. Rack 3, resource routes, and so much more.
hanamirb.org/blog/2025/11...
@matthewford.bsky.social great to hear you on Code with Jason!
November 12, 2025 at 9:37 AM
@matthewford.bsky.social great to hear you on Code with Jason!
Today in #ruby and #eventsourcing : test an entire workflow composed of multiple reactors sending messages to each other, all in-memory, and assert the full workflow as the trail of events left behind. No databases hurt in the process.
November 11, 2025 at 11:14 PM
Today in #ruby and #eventsourcing : test an entire workflow composed of multiple reactors sending messages to each other, all in-memory, and assert the full workflow as the trail of events left behind. No databases hurt in the process.
I think this is a pretty nice way to test event-sourced projectors
November 11, 2025 at 2:58 PM
I think this is a pretty nice way to test event-sourced projectors
I'll be at today's London Ruby User Group meet-up, speaking about Event Sourcing, eventual consistency and durable messaging patterns. Show up if interested! lrug.org
LRUG | London Ruby User Group
The London Ruby User Group (LRUG) meets on the 2nd Monday of the month for talking and socialising (about Ruby).
lrug.org
November 10, 2025 at 10:25 AM
I'll be at today's London Ruby User Group meet-up, speaking about Event Sourcing, eventual consistency and durable messaging patterns. Show up if interested! lrug.org
Reposted by Ismael Celis
Are you ready for the Scottish Ruby User Group this week? We're to be joined by the fabulous @ismaelcelis.com to talk durable messaging, event sourcing and more! Also: you can just hang out with other Rubyists. Sign up and we'll see you on Thursday! www.meetup.com/scotrug/even...
Durable messaging and related patterns in Ruby, for fun and profit, Thu, Nov 13, 2025, 6:00 PM | Meetup
Hallowe'en is almost upon us - get ready for [the Samhuinn celebrations](https://beltane.org/about-samhuinn/) maybe carve yourself a neep as tradition suggests. And then? W
www.meetup.com
November 9, 2025 at 10:51 PM
Are you ready for the Scottish Ruby User Group this week? We're to be joined by the fabulous @ismaelcelis.com to talk durable messaging, event sourcing and more! Also: you can just hang out with other Rubyists. Sign up and we'll see you on Thursday! www.meetup.com/scotrug/even...
I need to shave off 16 minutes from this talk somehow, without it losing meaning.
November 9, 2025 at 12:37 PM
I need to shave off 16 minutes from this talk somehow, without it losing meaning.
Autonomous components communicating by reading and appending messages to a log. This temporal decoupling is what enables the logical boundaries that most micro-services fail to achieve. Blocking direct calls = temporal coupling.
November 9, 2025 at 12:50 AM
Autonomous components communicating by reading and appending messages to a log. This temporal decoupling is what enables the logical boundaries that most micro-services fail to achieve. Blocking direct calls = temporal coupling.
Re-playability and autonomy, two faces of the same coin.
November 9, 2025 at 12:31 AM
Re-playability and autonomy, two faces of the same coin.
Playing with Given, When, Then helpers to test event-sourced Actors.
GIVEN these previous events
WHEN I dispatch a new command
THEN I expect these new events
Pure, behaviour tests, no database in sight.
GIVEN these previous events
WHEN I dispatch a new command
THEN I expect these new events
Pure, behaviour tests, no database in sight.
November 8, 2025 at 6:09 PM
Playing with Given, When, Then helpers to test event-sourced Actors.
GIVEN these previous events
WHEN I dispatch a new command
THEN I expect these new events
Pure, behaviour tests, no database in sight.
GIVEN these previous events
WHEN I dispatch a new command
THEN I expect these new events
Pure, behaviour tests, no database in sight.
Sourced's durable workflows are just event-sourced reactors under the hood, so they can participate in "conversations" with other actors just as well. This example holiday booking runs and retries steps sequentially.
November 8, 2025 at 12:19 PM
Sourced's durable workflows are just event-sourced reactors under the hood, so they can participate in "conversations" with other actors just as well. This example holiday booking runs and retries steps sequentially.