Creating an all-purpose REST API for Cloud services using OSGi and Sling - C Ziegeler & D Bosschaert

Creating a REST API for Cloud services using OSGi and Sling
Carsten Ziegeler and David Bosschaert
© 2014 Adobe Systems Incorporated. All Rights Reserved. AAddoobbee CCoonnffddeennttiiaall..

Speakers
● David Bosschaert (davidb@apache.org)
– R&D Adobe Research Dublin
– Co-chair OSGi EEG
– Open-source and cloud enthusiast
● Carsten Ziegeler (cziegeler@apache.org)
– R&D Adobe Research Switzerland
– OSGi Board, CPEG and EEG member
– ASF member

Agenda
●A REST site
with Apache Sling
●Scale it up!
with OSGi and jclouds

Te Next Great Application
© 2014 Adobe Systems Incorporated. All Rights Reserved. Adobe Confdential.

ROA and REST
● htp://…/products.jsp?id=5643564
● htp://…/slingshot/slingshot1/public/travel/pet.(html|json)

Resource Oriented Architecture
● Every piece of information is a resource
● User home, category, item, image, comment
● Descriptive URI
● Stateless web architecture (REST)
● Request contains all relevant information
● Targets the resource
● Leverage HTTP
● GET for rendering, POST/PUT/DELETE for operations

SlingShot Content Structure
/
slingshot1 slingshot2
public
travel
home pet
images comments ratings
pet.jpg

Resource-frst Request Processing
● Request: /slingshot1/public/travel/pet/comments.10.json
● Resource: /slingshot1/public/travel/pet/comments
● Extension: json
● Selector: 10
● Method: GET
● Resource Type : slingshot/comments

Resource-frst Request processing
1. Resolve the resource
2. Resolve processing script
3. Build execution chain
4. Execute

Scripting Inside
● It’s your choice
● JSP, servlet, ESP, Scala, Sightly
● javax.script
● own script handlers
● Default servlets
● JSON, XML
● POST/update/create/delete handling
● Error handling

<sling:defineObjects/>
<div class="comment">
<%
final ValueMap attr = resource.getValueMap();
final String title = attr.get(PROPERTY_TITLE,
resource.getName());
final String description = attr.get(PROPERTY_DESCRIPTION, "");
final String userId = attr.get(PROPERTY_USER, "");
%>
<h4><%= ResponseUtil.escapeXml(userId) %> :
<%= ResponseUtil.escapeXml(title) %></h4>
<p><%= ResponseUtil.escapeXml(description) %></p>
<p><%= ResponseUtil.escapeXml(
attr.get(SlingshotConstants.PROPERTY_CREATED, "")) %></p>
</div>

Resource Providers
/
slingshot1
public
travel
home pet
images comments ratings
pet.jpg
MongoDB
FS
JCR
Apache Jackrabbit

Scale UP!
● Efectively use the cloud
● Scale up/down based on need
● start small = cheap
● No downtime
● when moving to larger machines
● No cloud-provider specifcs

Sling
OOSSGGii NNooddee
28/10/14
Sling in the cloud
Load Balancer(s)
OOSSGGii NNooddee
Sling
Director
traffic

OOSSGGii NNooddee
Sling
Sling
28/10/14
Director
OOSSGGii NNooddee
Sling
Director
provision
inspect
discover
OOSSGGii NNooddee
Sling
OOSSGGii NNooddee
jclouds
create
destroy
mmeettrriiccss
OSGi Cloud Ecosystems (RFC 183)
FrameworkNodeStatus Service

Sling
OOSSGGii NNooddee
Sling
28/10/14
Busy times
Load Balancer(s)
OOSSGGii NNooddee
Sling
Director
traffic
OOSSGGii NNooddee
OOSSGGii NNooddee
Sling

Sling
28/10/14
Quiet times
Load Balancer(s)
OOSSGGii NNooddee
Director
traffic

Sling Sling
Sling Sling
28/10/14
Really Quiet times
Load Balancer(s)
OOSSGGii NNooddee
Director
Docker
instances

Summary
● Use Sling to build your REST service
● Write your app using anything that can interact with REST
● Native app
● Javascript
● …
● Use OSGi Cloud Ecosystems, Apache jclouds and Docker to scale
● Be cloud-vendor independent!

Interested in OSGi and Cloud?
● Come to the OSGi Cloud Workshop
Wednesday October 29 at 15:15 (Seminarräume 1-3)

Innovation at Adobe
22
Links
● Apache Sling – htp://sling.apache.org
● Apache jclouds – htp://jclouds.apache.org
● SlingShot Sample application – htp://svn.apache.org/repos/asf/sling/trunk/samples/slingshot
● OSGi Cloud Ecosystems RFC 183 – htps://github.com/osgi/design/tree/master/rfcs/rfc0183

Creating an all-purpose REST API for Cloud services using OSGi and Sling - C Ziegeler & D Bosschaert

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