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<!doctype html>
<html lang="en" xmlns="http://www.w3.org/1999/html" xmlns="http://www.w3.org/1999/html">
<head>
<meta charset="utf-8">
<title>PJUG 07.2014 / JaVers talk</title>
<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">
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/nap.css" id="theme">
<!-- For syntax highlighting -->
<link rel="stylesheet" href="lib/css/googlecode.css">
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</script>
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div id="slides-footer"><img src="img/javers_big.png" width="200px"/></div>
<div class="slides">
<section>
<img src="img/javers_big.png">
<h3>Paweł Szymczyk</h3>
<h3>Bartosz Walacik</h3>
javers.org
</section>
<section>
<h2>javers project</h2>
<ul>
<li>Open source library</li>
<li>Technology agnostic</li>
<li>Based on Reflection & JSON</li>
<li><code>https://github.com/javers/javers</code></li>
<li><code>javers.org</code></li>
<li><code>compile 'org.javers:javers-core:0.7.0'</code></li>
</ul>
</section>
<section>
<h2>What Javers can do for you?</h2>
<ul>
<li>Find diff between two graphs of objects</li>
<li>Data audit</li>
</ul>
</section>
<section>
<h2>Allegro category tree - Use Case </h2>
</section>
<section>
<h1>Show time!</h1>
<pre><code>
git clone https://github.com/javers/javers-demo.git
gradlew bootRun
</code></pre>
Requires mongod at localhost, Java8
</section>
<section>
<h2>Javers Domain</h2>
</section>
<section>
<h2>Commit</h2>
<pre><code>
package org.javers.core.commit
...
public final class Commit {
private final CommitId id;
private final List<CdoSnapshot> snapshots;
private final String author;
private final LocalDateTime commitDate;
private final Diff diff;
...
}
</code></pre>
</section>
<section>
<h2>Snapshot</h2>
<pre><code>
package org.javers.core.metamodel.object;
...
public final class CdoSnapshot extends Cdo {
private CommitId commitId;
private final Map<Property, Object> state;
...
}
</code></pre>
</section>
<section>
<h2>Diff</h2>
<pre><code>
package org.javers.core.diff;
...
public class Diff implements Visitable<ChangeVisitor>{
private final List<Change> changes;
...
}
</code></pre>
</section>
<section>
<h2>Change</h2>
<pre><code>
package org.javers.core.diff;
...
public abstract class Change implements Visitable<ChangeVisitor> {
private final GlobalCdoId affectedCdoId;
private transient Optional<Object> affectedCdo;
...
}
</code></pre>
</section>
<section>
<h1>OJM</h1>
</section>
<section>
<h2>Client model mapping</h2>
<p>User classes are mapped to:</p>
<ul>
<li><code>Entity</code></li>
<li><code>ValueObject</code></li>
<li><code>Value</code></li>
</ul>
<p/>
<p>Java types are mapped to:</p>
<ul>
<li><code>Primitive</code></li>
<li><code>Value</code> (ex <code>BigDecimal</code>)</li>
<li><code>Array, Set, List, Map</code></li>
</ul>
</section>
<section>
<h3>Looking for early adopters</h3>
<img src="img/clients.jpg">
</section>
<section>
<h3>Looking for contributors</h3>
<div>Javers needs you!</div>
<img src="img/javers-needs-you.png">
</section>
<section>
<h2>Profits for contributors</h2>
<ul>
<li>Knowledge sharing</li>
<li>Build your <code>Karma</code></li>
<li>No UI, no servers, no deployments </li>
<li>We choose technology stack: <br/> <code><b>Spock</b>, Groovy, Pico, Gson, Gradle, MongoDB</code></li>
</ul>
</section>
<section>
<h3>Javers Team</h3>
<img src="img/stars3.jpg">
</section>
<section>
<img src="img/spock.jpg" height="500" />
</section>
<section>
<img src="img/stars4r.jpg"/>
</section>
<section>
<h2>How do we work?</h2>
</section>
<section>
<h3>BDD</h3>
<pre><code>def "should append newObjects to diff"() {
given:
def left = buildLiveGraph(dummyUser().withName("1")
.build())
def right = buildLiveGraph(dummyUser().withName("1").withDetails(5)
.build())
when:
def changes = new NewObjectAppender()
.getChangeSet(new GraphPair(left, right))
then:
changes.size() == 1
assertThat(changes[0]).isNewObject()
}</code></pre>
</section>
<section>
<h3>Pair programming via hangouts</h3>
<img src="img/remote.png" />
</section>
<section>
<h3>Code review</h3>
<img src="img/github.png" />
</section>
<!--<section>-->
<!--<h3>Code review on github</h3>-->
<!--</section>-->
<section>
<h2>About project</h2>
<ul>
<li>Src in Java 7</li>
<li>Tests in Spock, Groovy</li>
<li>11 kloc src</li>
<li>8 klock test</li>
<li>420 BDD tests</li>
<li>87% coverage</li>
</ul>
</section>
<section>
<h2>Dziękujemy za uwagę!</h2>
<h2>Q & A ... </h2>
<br/>
<h3>Contact us</h3>
<table id="slimTable">
<tr>
<td>Paweł Szymczyk</td>
<td><a href="http://javers.org">javers.org</a></td>
<td><a>@p_szymczyk</a></td>
</tr>
<tr>
<td>Bartosz Walacik</td>
<td><a href="http://javers.org">javers.org</a></td>
<td><a>@BartoszWalacik</a></td>
</tr>
</table>
<br/>
<br/>
<small><a href="https://github.com/javers/wjug-talk">http://github.com/javers/wjug-talk</a></small>
</section>
</div>
</div>
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