"almost my entire career I've heard people talking about event-driven architectures and event driven systems and things of that kind and it's always been a little bit odd as to what what actually do pe..."

"cuz I dug into other things instead but it really kind of came to a head late last year um at Fort Works we've been doing quite a lot of event-driven stuff and various people came to roughly the same ..."

"bit more Precision into what we're talking about and so we thought that's important that we describe this and say a bit more to the rest of the world about some of our thoughts and I hope really hard ..."

"time gradually revealing what they are so to begin the first one let's imagine some example system that might be had by an insurance company and in this insurance system we have our customers and our ..."

"that a lot of people don't really like very much so one way we can get around this coupling is we can say instead of doing that let's try and reverse things around I don't mind my insurance quoting sy..."

"and this is an approach that um we in our discussion whoops giving you a slideway there in our discussion we referred to as event notification we're using events as a notification system uh notificati..."

"dependencies now I've talked about this in terms of events and I've stressed this dependency switch that it does but it also does something else it bottles it sort of takes everything to do with the c..."

"has its own benefits if once we can do that so we're actually getting a second benefit here which is this bottling it up into a into a thing into an object or I don't have to hesitate about using obje..."

"insurance for this customer that's the customer management system saying it knows what ought to be done and it's telling some remote system here's what you should do when I phrase it in terms of event..."

"happen then I want to name it in terms of a command now I mean you can get all the way over way you could have your insurance quoting system might ex insist on sending a communication an email to the ..."

"attractive ability um and it easily allows you to do all sorts of interesting things without changing what's going on but when anything sounds like it's really nice there's always a butt isn't that an..."

"tradeoffs so that's the first thing event notification and that I would probably say is the most common that people say when they're event driven they're using an event notification mechanism um somew..."

"of time if I'm saying here's the address change then there's less traffic required because I only need to go in if I can care about an address change and then I can take this to The Logical um final c..."

"consistency so this is a less common pattern um I don't know what the proportions are I would say a lot of the time that I see event notification I don't see event State trans based State transfer but..."

"understand it well enough they think they could explain it to somebody else a few okay I'm not going to ask you to come up on stage and do it don't worry okay here's how I explain event sourcing and s..."

"finger magig that captures the details of a change and we pop that first class finger Mig the event into some kind of separate storage area then we process that event and we process the event to do ex..."

"is Version Control if you use git you use subversion Mercurial even if you use CVS and I have it was a long time ago but I used it you've used an Event Source system hell I use sccs you know shows how..."

"snapshots a common thing in accounting is to say at the end of a year or something would would say we're going to close out the year we calculate all the balances for the end of the year and then we k..."

"good things is actually one of the most intriguing the idea of using a memory image this basically says if our long-term record of what the state of a system is a l of events actually I should walk ov..."

"systems that have large amounts of nonvolatile main memory um because so much of our of our systems have been built under this assumption that we've only got so much memory we have to park everything ..."

"and you have to think through how to get through those so those definitely do add complexity and you get other complexity that typically comes along for the ride one of the trigger for doing this talk..."

"to use asyn new invent approach even though it seems common that people confuse that another issue is versioning versioning can get quite complicated in invent Source system because of this ability to..."

"that book so events sourcing is like most things a tradeoff there are pros and cons there are some really nice advantages there are complexities involved I do find it surprising that more people haven..."

"difficult to do that because of course a rename function method uh function cap capability for that would work with JavaScript is not going to work with Java is not going to work with python so I have..."

"store more than one of these if you look carefully at the slide you might notice we have a slight problem the code isn't quite right the total is wrong what happens to me fixing this bug I've got to b..."

"worked in um the the canonical style that I that I saw back in the '90s when doing this was we would store the external event and then actually all the changes to the application state would be accoun..."

"to go part good part of the discussion we had at this Workshop was this question of what's more important the internal or the input event um and as I said I do think it's it's certainly important to b..."

"use the command component command model when you're making an update you always read using something else I mean you might do some read in the middle of processing the command uh will do some reads bu..."

"a bit confused because I've heard people say well I we think cqrs should be used everywhere because it's really useful to have different uh models for reading things and populating different models bu..."