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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Event Sourcing</title>
<meta name="description" content="A framework for easily creating beautiful presentations using HTML">
<meta name="author" content="Hakim El Hattab">
<meta name="apple-mobile-web-app-capable" content="yes" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/infosupport.css" id="theme">
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document.getElementsByTagName( 'head' )[0].appendChild( link );
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<script>
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}
</script>
<!--Add support for earlier versions of Internet Explorer -->
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
<style>
.reveal .slides > section p {
text-align: center;
}
.reveal .slides > section .left {
float:left;
width:50%;
}
.reveal .slides > section .right {
float:right;
width:50%;
}
</style>
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
<link rel="stylesheet" href="plugin/d3js/tessellation.css">
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section>
<h2>Event Sourcing </h2>
<p><img src="img/webscale.png" style="height:450px;"/></p>
<footer style="padding-top:25px;">
<small>Bob van den Berge</small>
</footer>
</section>
<section>
<h2>Doel</h2>
<p>Concept 'Event Sourcing' helder</p>
</section>
<section>
<section>
<h2>Wat is Event Sourcing?</h2>
<blockquote class="fragment" data-fragment-index="0">Using an object's <strong>history</strong> to reconstitute its <strong>state</strong></blockquote>
<aside class="notes">
<ul>
<li>Rekening, sommatie van events</li>
<li>Hail the column</li>
<li>Discussie over facts, niet resultaat</li>
<li>Bewijzen van staat</li>
<li>Reden dat het populair is</li>
<li>State is view van je history</li>
</ul>
</aside>
</section>
<section>
<p><img src="img/State%201.svg" /></p>
<aside class="notes">
<ul>
<li>Huidige model</li>
<li>Andere manieren</li>
<li>Rapportering</li>
<li>Only from now</li>
</ul>
</aside>
</section>
<section>
<img src="img/State%203.svg" />
<aside class="notes">
<ul>
<li>Event opslaan als staat</li>
<li>Events are facts, immutable</li>
<li>Unknown future requirements</li>
</ul>
</aside>
</section>
<section>
<div class="left" style="width:40%;">
<img src="img/State%203.svg" style="padding:70px 0;"/>
</div>
<div class="left" style="width:5%;">
<img src="img/jsonBoxConnector.png" style="height:260px;padding:4px 0 0 0;"/>
</div>
<div class="right" style="width:55%;">
<pre>
{
'user_id': 3,
'type': 'ArtikelToegevoegd',
'timestamp': '<script type="text/javascript">document.write(Date.now());</script>',
'data':
{
'artikel': 'Toetsenbord'
}
}
</pre>
</div>
</section>
<section>
<h2>Event Store</h2>
<div class="left" >
<img src="img/Event%20Store.svg"/>
</div>
<div class="right" >
<ul>
<li class="fragment" data-fragment-index="0">List of immutable events</li>
<li class="fragment" data-fragment-index="1">Append only</li>
</ul>
<p class="fragment" data-fragment-index="3" style="font-style: italic;">You can't change history!</p>
</div>
</section>
<section>
<h2>Immutability</h2>
<p>Geen update/delete</p>
<ul>
<li class="fragment" data-fragment-index="0">Performance door caching</li>
<li class="fragment" data-fragment-index="1">Audit logging</li>
<li class="fragment" data-fragment-index="2">Simple backups</li>
<li class="fragment" data-fragment-index="3">Bescherming tegen media decay/bit rot</li>
<li class="fragment" data-fragment-index="4">Disk space</li>
</ul>
<aside class="notes">
<ul>
<li>Multi-kopie, altijd laatste versie</li>
<li>Audit: kan met hashen</li>
<li>Backup: alleen delta</li>
<li>Beschermin: checksum</li>
<li>Space: hoeveel is 1GB?</li>
</ul>
</aside>
</section>
<section data-transition="slide-in none">
<h2>Compensating transaction</h2>
<p>Wat als je iets verkeerd doet?</p>
<img src="img/CT/Compensating%20Transactions%20V1.svg"/>
</section>
<section data-transition="none">
<h2>Compensating transaction</h2>
<p>Wat als je iets verkeerd doet?</p>
<img src="img/CT/Compensating%20Transactions%20V2.svg"/>
</section>
<section data-transition="none">
<h2>Compensating transaction</h2>
<p>Wat als je iets verkeerd doet?</p>
<img src="img/CT/Compensating%20Transactions%20V3.svg"/>
</section>
<section data-transition="none">
<h2>Compensating transaction</h2>
<p>Wat als je iets verkeerd doet?</p>
<img src="img/CT/Compensating%20Transactions%20V4.svg"/>
</section>
<section data-transition="none">
<h2>Compensating transaction</h2>
<p>Wat als je iets verkeerd doet?</p>
<img src="img/CT/Compensating%20Transactions%20V5.svg"/>
</section>
<section data-transition="none">
<h2>Compensating transaction</h2>
<p>Wat als je iets verkeerd doet?</p>
<img src="img/CT/Compensating%20Transactions%20V6.svg"/>
<aside class="notes">
<ul>
<li>Shows intent, rekening</li>
</ul>
</aside>
</section>
<section data-transition="slide-in none">
<h2>Projections</h2>
<blockquote class="fragment" data-fragment-index="0">Current state is a left-fold of previous behaviours.</blockquote>
</section>
<section data-transition="none">
<h2>Projections</h2>
<img src="img/replay/Step%201.svg" style="width:100%;"/>
<aside class="notes">
<ul>
<li>Query by id only</li>
</ul>
</aside>
</section>
<section data-transition="none">
<h2>Projections</h2>
<img src="img/replay/Step%202.svg" style="width:100%;"/>
</section>
<section data-transition="none">
<h2>Projections</h2>
<img src="img/replay/Step%203.svg" style="width:100%;"/>
</section>
<section data-transition="none">
<h2>Projections</h2>
<img src="img/replay/Step%204.svg" style="width:100%;"/>
</section>
<section data-transition="none">
<h2>Projections</h2>
<img src="img/replay/Step%205.svg" style="width:100%;"/>
</section>
<section data-transition="none">
<h2>Projections</h2>
<img src="img/replay/Step%205.1.svg" style="width:100%;"/>
</section>
<section data-transition="none">
<h2>Projections</h2>
<img src="img/replay/Step%205.2.svg" style="width:100%;"/>
</section>
<section data-transition="none">
<h2>Projections</h2>
<img src="img/replay/Step%205.3.svg" style="width:100%;"/>
</section>
<section data-transition="none">
<h2>Projections</h2>
<img src="img/replay/Step%206.svg" style="width:100%;"/>
</section>
<section data-transition="none">
<h2>Projections</h2>
<img src="img/replay/Step%207.svg" style="width:100%;"/>
</section>
<section data-transition="none">
<h2>Projections</h2>
<img src="img/replay/Step%208.svg" style="width:100%;"/>
</section>
<section data-transition="none">
<h2>Projections</h2>
<img src="img/replay/Step%209.svg" style="width:100%;"/>
</section>
<section data-transition="none">
<h2>Projections</h2>
<img src="img/replay/Step%2010.svg" style="width:100%;"/>
<aside class="notes">
<ul>
<li>Debugging, stop rewing replay</li>
<li>Testing</li>
</ul>
</aside>
</section>
<section>
<h2>Service Architectuur</h2>
<img src="img/Architecture%20V1.svg" />
<aside class="notes">
<ul>
<li>SQL Server log for db</li>
<li>Immutable</li>
</ul>
</aside>
</section>
<section>
<h2>Wat is het niet?</h2>
<ul>
<li>Holy grail</li>
<li>Top level architecture</li>
</ul>
</section>
</section>
<section>
<h1>Voordelen</h1>
<ul>
<li class="fragment" data-fragment-index="0">Lijst van immutable events</li>
<li class="fragment" data-fragment-index="1">Realtime BI</li>
<li class="fragment" data-fragment-index="2">Debugability/Testability</li>
<li class="fragment" data-fragment-index="3">Performance (append only)</li>
<li class="fragment" data-fragment-index="4">Geen object <-> relational database mappings</li>
<li class="fragment" data-fragment-index="5">Scalable (read models)</li>
<li class="fragment" data-fragment-index="6">Temporal queries</li>
<li class="fragment" data-fragment-index="7">Selective/Occassional synchronisation</li>
</ul>
</section>
<section>
<h1>Nadelen</h1>
<ul style="padding-bottom:280px;">
<li class="fragment" data-fragment-index="0">Complex</li>
<li class="fragment" data-fragment-index="1">Event log groeit snel</li>
</ul>
<aside class="notes">
<ul>
<li>Complex in business way, not technical</li>
<li>Disk space cheap</li>
</ul>
</aside>
</section>
<section>
<section>
<h1>Patterns</h1>
<p class="fragment" data-fragment-index="0">Alleen gebruiken als noodzakelijk!</p>
</section>
<section data-transition="slide-in none">
<h2>Snapshotting</h2>
<img src="img/Snapshotting%201.svg" />
</section>
<section data-transition="none slide-out">
<h2>Snapshotting</h2>
<img src="img/Snapshotting%202.svg" />
</section>
<section data-transition="slide-in none">
<h2 style="margin: 0;">Read models</h2>
<p style="margin:0;">Optimized query handling</p>
<img class="fragment" data-fragment-index="0" src="img/Readmodels%20V1.svg" />
</section>
<section data-transition="none slide-out">
<h2 style="margin: 0;">Read models</h2>
<p style="margin:0;">Optimized query handling</p>
<img src="img/Readmodels%20V2.svg" />
<aside class="notes">
<ul>
<li>Immediate vs Eventual Consistency</li>
<li>Projections</li>
<li>Cache, dus selective rebuild</li>
<li>Consumer driven subscription (Blog)</li>
<li>Server driven subscription (AMQP)</li>
</ul>
</aside>
</section>
<section data-transition="none">
<h2 style="margin: 0;">Read models</h2>
<p style="margin:0;">Server driven subscription</p>
<img src="img/Readmodels%20V3.svg" />
<aside class="notes">
<ul>
<li>2 problems (control channel, replay)</li>
<li>Blog example</li>
</ul>
</aside>
</section>
<section data-transition="none">
<h2 style="margin: 0;">Read models</h2>
<p style="margin:0;">Server driven subscription</p>
<img src="img/Readmodels%20V4.svg" />
<aside class="notes">
<ul>
<li>2 problems (control channel, replay)</li>
<li>Blog example</li>
</ul>
</aside>
</section>
<section data-transition="none slide-out">
<h2 style="margin: 0;">Read models</h2>
<p style="margin:0;">Consumer driven subscription</p>
<img src="img/Readmodels%20V2.svg" />
<aside class="notes">
<ul>
<li>ATOM: Where now, where is first</li>
<li>Replay on top 50</li>
<li>Consumer remembers position, not producer</li>
</ul>
</aside>
</section>
<section>
<h2>Versioning</h2>
<p>In-memory upgrade mechanism</p>
<div>
<div class="left" style="width:48%;padding: 25px 0;">
<pre>
{
'user_id': 3,
'type': 'ArtikelToegevoegd',
'timestamp': '<script type="text/javascript">document.write(Date.now());</script>',
'data': {
'artikel': 'Toetsenbord'
}
}
</pre>
</div>
<div class="right">
<pre class="fragment" data-fragment-index="0" >
{
'user_id': 3,
'type': 'ArtikelToegevoegd',
'version': 2,
'timestamp': '<script type="text/javascript">document.write(Date.now());</script>',
'data': {
'artikel': 'Toetsenbord',
'platform': 'Desktop'
}
}
</pre>
</div>
</div>
<aside class="notes">
<ul>
<li>In event store</li>
</ul>
</aside>
</section>
<section>
<h2>Versioning</h2>
<img src="img/Event%20upgrader.svg" />
</section>
<section>
<h2>Versioning</h2>
<p>Event merging/Splitting up</p>
<div>
<div class="left" style="width:48%;">
<pre>
{
'type': 'MouseDown'
}
</pre>
<pre>
{
'type': 'MouseUp'
}
</pre>
</div>
<div class="right" style="padding:70px 0;">
<pre class="fragment" data-fragment-index="0" >
{
'type': 'Clicked'
}
</pre>
</div>
</div>
</section>
<section>
<h2>Versioning</h2>
<img src="img/Event%20Versioning.png" />
</section>
<section data-transition="slide-in none">
<h2>TWK mutaties</h2>
<img src="img/twk/TWK%20Mutaties%20V1.svg"/>
</section>
<section data-transition="none">
<h2>TWK mutaties</h2>
<img src="img/twk/TWK%20Mutaties%20V2.svg"/>
</section>
<section data-transition="none">
<h2>TWK mutaties</h2>
<img src="img/twk/TWK%20Mutaties%20V3.svg"/>
</section>
<section data-transition="none">
<h2>TWK mutaties</h2>
<img src="img/twk/TWK%20Mutaties%20V4.svg"/>
</section>
<section data-transition="none">
<h2>TWK mutaties</h2>
<img src="img/twk/TWK%20Mutaties%20V5.svg"/>
</section>
<section data-transition="none">
<h2>TWK mutaties</h2>
<img src="img/twk/TWK%20Mutaties%20V6.svg"/>
</section>
<section data-transition="none">
<h2>TWK mutaties</h2>
<img src="img/twk/TWK%20Mutaties%20V7.svg"/>
</section>
<section data-transition="none">
<h2>Concurrency</h2>
<img class="fragment" data-fragment-index="0" src="img/concurrency/Concurrency%20V1.svg"/>
</section>
<section data-transition="none">
<h2>Concurrency</h2>
<img src="img/concurrency/Concurrency%20V2.svg"/>
</section>
<section data-transition="none">
<h2>Concurrency</h2>
<img src="img/concurrency/Concurrency%20V3.svg"/>
</section>
<section data-transition="none">
<h2>Concurrency</h2>
<img src="img/concurrency/Concurrency%20V4.svg"/>
</section>
<section data-transition="none">
<h2>Concurrency</h2>
<img src="img/concurrency/Concurrency%20V5.svg"/>
<aside class="notes">
<ul>
<li>Only reject failures</li>
<li>GIT</li>
</ul>
</aside>
</section>
</section>
<section>
<h2>Wanneer Event Sourcing?</h2>
<ul>
<li>Rich domain models</li>
<li>Non-CRUD behaviour</li>
<li>Auditing</li>
<li>Monitoring/ Realtime BI</li>
<li>Domain is inherently event driven</li>
</ul>
</section>
<section>
<h2>Producten</h2>
<ul>
<li>GetEventStore (by Greg Young)</li>
<li>NEventStore</li>
<li>Kafka</li>
</ul>
</section>
<section>
<h2>Future</h2>
<ul>
<li>Code changes?</li>
<li>N-temporal queries</li>
<li>Client side Event Sourcing
<ul>
<li>Occasionally connected system</li>
</ul>
</li>
</ul>
<aside class="notes">
<ul>
<li>Changes: belastingaangifte</li>
<li>N-Temp: jij weet nu wat?</li>
<li>GIT: in Tunnel</li>
</ul>
</aside>
</section>
<section>
<h1>Bedankt!</h1>
</section>
</div>
</div>
<script src="lib/js/head.min.js"></script>
<script src="js/reveal.js"></script>
<script src="plugin/d3js/d3.v3.min.js"></script>
<script src="plugin/d3js/tessellation.js"></script>
<script>
// Full list of configuration options available at:
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Reveal.initialize({
controls: true,
progress: true,
history: true,
center: true,
theme: Reveal.getQueryHash().theme, // available themes are in /css/theme
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// Optional reveal.js plugins
dependencies: [
{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },
{ src: 'plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: 'plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: 'plugin/highlight/highlight.min.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },
{ src: 'plugin/zoom-js/zoom.js', async: true },
{ src: 'plugin/notes/notes.js', async: true }
]
});
Reveal.addEventListener( 'ready', function( event ) {
tesselationInit();
} );
</script>
</body>
</html>