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---
layout: default
title: "The CloudKeeper DSL and Runtime System"
---
{% include common-svg.svg %}
<!-- Main jumbotron for a primary marketing message or call to action -->
<div class="jumbotron">
<div class="container">
<div class="row">
<div class="col-sm-2 vcenter">
<img class="img-responsive fill-width" src="assets/cloudkeeper-logo.svg"/>
</div><!--
no whitespace
--><div class="col-sm-10 vcenter">
<h1>CloudKeeper<br><small>Dataflow programming on the JVM</small></h1>
</div>
</div>
<p>
CloudKeeper is a domain-specific language and runtime system for implementing and running dataflows on the Java Virtual Machine. Designed to facilitate “programming in the large”, CloudKeeper is entirely general-purpose and abstracts away concerns such as data transfer, serialization, scheduling, checkpointing, and package/dependency management.
</p>
<p><a class="btn btn-primary btn-lg" href="{{ '/language' | prepend: site.baseurl }}" role="button">Learn more »</a></p>
</div>
</div>
<!-- Marketing messaging and featurettes
================================================== -->
<!-- Wrap the rest of the page in another container to center all the content. -->
<div class="container marketing">
<div class="row featurette">
<div class="col-md-7 vcenter-md">
<h2 class="featurette-heading">Programming in the Large. <span class="text-muted">Declarative Style.</span></h2>
<p class="lead">
The functional units in CloudKeeper dataflows are called <em>modules</em>, and they have in- and out-<em>ports</em>.
Orchestrate domain logic by simply instantiating modules and creating connections between ports.
</p>
</div><!--
no whitespace
--><div class="col-md-5 vcenter-md">
<svg class="center-block img-responsive" xmlns="http://www.w3.org/2000/svg" width="330px" viewBox="0 10 330 205">
<defs>
<circle id="port" r="10"/>
<marker id="connection-marker" viewBox="0 0 28 12" refX="34" refY="6" markerUnits="userSpaceOnUse"
markerWidth="15" markerHeight="6" orient="auto">
<path d="M 0 0 L 16 6 L 0 12 z"/>
</marker>
</defs>
<rect id="M" class="module" x="15" y="15" rx="7" ry="7" width="300" height="195"/>
<path id="a->i" class="connection" d="M15 82.5 C 75 15, 135 15, 195 45"/>
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<polyline id="m->r" class="connection" points="270 90 315 112.5"/>
<polyline id="p->s" class="connection" points="270 165 315 142.5"/>
<use id="a" class="inport" x="15" y="82.5" xlink:href="#port"/>
<use id="b" class="inport" x="15" y="112.5" xlink:href="#port"/>
<use id="c" class="inport" x="15" y="142.5" xlink:href="#port"/>
<use id="q" class="outport" x="315" y="82.5" xlink:href="#port"/>
<use id="r" class="outport" x="315" y="112.5" xlink:href="#port"/>
<use id="s" class="outport" x="315" y="142.5" xlink:href="#port"/>
<rect id="N" class="module submodule" x="75" y="45" rx="7" ry="7" width="75" height="90"/>
<use id="d" class="inport" x="75" y="75" xlink:href="#port"/>
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<use id="f" class="outport" x="150" y="60" xlink:href="#port"/>
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<use id="i" class="inport" x="195" y="45" xlink:href="#port"/>
<use id="j" class="inport" x="195" y="75" xlink:href="#port"/>
<use id="k" class="inport" x="195" y="105" xlink:href="#port"/>
<use id="l" class="outport" x="270" y="60" xlink:href="#port"/>
<use id="m" class="outport" x="270" y="90" xlink:href="#port"/>
<rect id="Q" class="module submodule" x="195" y="135" rx="7" ry="7" width="75" height="60"/>
<use id="n" class="inport" x="195" y="150" xlink:href="#port"/>
<use id="o" class="inport" x="195" y="180" xlink:href="#port"/>
<use id="p" class="outport" x="270" y="165" xlink:href="#port"/>
</svg>
</div>
</div>
<hr class="featurette-divider">
<div class="row featurette">
<div class="col-md-5 col-md-push-7 col-lg-6 col-lg-push-6 vcenter-md">
<h2 class="featurette-heading">Scalable. <span class="text-muted">Write once, run everywhere.</span></h2>
<p class="lead">
Debug dataflows in a single JVM on a laptop, and deploy in the cloud – without changing a single line of code. CloudKeeper abstracts away low-level details such as serialization, data movement, check-pointing, scheduling, or dependency/package management.
</p>
</div><!--
no whitespace
--><div class="col-md-7 col-md-pull-5 col-lg-6 col-lg-pull-6 vcenter-md">
{% highlight java %}
@CompositeModulePlugin("Analyzes DNA")
public abstract class GenomeAnalysisModule
extends CompositeModule<GenomeAnalysisModule> {
public abstract InPort<FASTQ> dnaFragments();
public abstract OutPort<PDF> report();
AlignModule alignModule = child(AlignModule.class)
.dnaFragments().from(dnaFragments())
.reference().from(value(Constants.REFERENCE_GENOME));
StatsModule statsModule = child(StatsModule.class)
.dnaFragments().from(dnaFragments());
ReportModule reportModule = child(ReportModule.class)
.mutations().from(align.mutations())
.stats().from(stats.stats());
{ report().from(reportModule.pdf()); }
}{% endhighlight %}
</div>
</div>
<hr class="featurette-divider">
<div class="row featurette">
<div class="col-md-7 vcenter-md">
<h2 class="featurette-heading">For Engineers. <span class="text-muted">By Engineers.</span></h2>
<p class="lead">
Embed CloudKeeper dataflows into other software-engineering projects. Write dataflows textually in the CloudKeeper <em>internal domain-specific language</em> that inherits Java’s type system as well as its excellent IDE support.
</p>
</div><!--
no whitespace
--><div class="col-md-5 vcenter-md">
<img class="img-responsive img-rounded center-block" src="assets/refactor.jpg" width="500" height="300" alt="Easy refactoring in IDE"/>
</div>
</div>
<hr class="featurette-divider">
<div class="row featurette">
<div class="col-md-7 col-md-push-5 vcenter-md">
<h2 class="featurette-heading">Lightweight. <span class="text-muted">Library, not a framework.</span></h2>
<p class="lead">
Use CloudKeeper as alternative to lower-level concurrency concepts such as threads, Java executor services, actor systems, etc. CloudKeeper is modular and versatile: Keep intermediate results as in-memory Java objects, in the file system, or in a cloud-storage service. Similarly, processing of individual tasks may be as different as using an existing thread pool or a distributed resource manager like Grid Engine.
</p>
</div><!--
no whitespace
--><div class="col-md-5 col-md-pull-7 vcenter-md">
{% highlight xml %}
<dependency>
<groupId>xyz.cloudkeeper.core</groupId>
<artifactId>cloudkeeper-api</artifactId>
</dependency>
<dependency>
<groupId>xyz.cloudkeeper.core</groupId>
<artifactId>cloudkeeper-model</artifactId>
</dependency>{% endhighlight %}
</div>
</div>
</div>
<script>
$(function() {
$(".inport").tooltip({
'title': 'in-port',
'container': 'body',
'placement': 'left'
});
$(".outport").tooltip({
'title': 'out-port',
'container': 'body',
'placement': 'right'
});
$(".submodule").tooltip({
'title': 'submodule',
'container': 'body',
'placement': 'bottom'
});
});
</script>