Apache Sling as an OSGi-powered REST middleware - Robert Munteau

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OSGi Community Event 2015 Apache Sling is an innovative web framework built on top of the Java Content Repository (JCR), that uses OSGi for its component model and fosters RESTful application design.</p> Apache Sling is designed as a set of loosely coupled OSGi bundles aggregated into a single jar or war launcher. Extensibility is internally achieved by using OSGi services. Even though Sling was initially designed for JSR-283 content repositories, building on top of the OSGi service registry allows plugging in multiple data sources - resource providers in Sling parlance. In this talk we will showcase the usage of OSGi extension points in Apache Sling which allows usage of multiple resource providers, from simple filesystem-based providers to complex ones like MongoDB or Cassandra. Running all providers at the same time allows Apache Sling to be used as a REST-based middleware for multiple data sources. This talk will present how this extensibility allows plugging in multiple data sources.

Technologie

http://robert.muntea.nu @rombert
Apache Sling as a RESTful API gateway for your NoSQL datastores
Apache Sling as a RESTful API gateway
for your NoSQL datastores
Robert Munteanu, Adobe Systems
EclipseCon Europe 2015

http://robert.muntea.nu @rombert
Who I am

$DAYJOB

Adobe Experience
Manager
 Apache Sling
 Apache Jackrabbit
 Apache Felix

FOSS

Apache Sling

MantisBT

Mylyn Connector for
MantisBT

Mylyn Connector for Review
Board

http://robert.muntea.nu @rombert
Agenda
●
Quick facts and figures
●
Meet Barry
●
Demo
●
Why is Sling such a good fit for an API gateway
●
Conclusions, Resources, Q&A

http://robert.muntea.nu @rombert
Apache Sling - History
2007
Incubation
2009
TLP
2015
Version 8
200x
Pre-Apache

http://robert.muntea.nu @rombert
High-level View of the Code
Source: OpenHub

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Level of activity
Source: OpenHub
Source: status.apache.org

http://robert.muntea.nu @rombert
Conceptual foundations
REST-based
Content-driven
OSGi-powered
Scripting InsideApache

http://robert.muntea.nu @rombert
REST-based
/content/blog/
/content/blog/{0}.html
/
BlogViewController
BlogListController
HomeController
SlingMainServlet
/
/content
/content/blog
/content/blog/hello-world

http://robert.muntea.nu @rombert
REST-based
/
/content
/content/blog
/content/blog/hello-world
[sling/redirect]
[sling/redirect]
[blog/welcome]
[blog/page]

http://robert.muntea.nu @rombert
Barry – Senior Buzzword Deliverer

http://robert.muntea.nu @rombert
Demo time!

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How is everything mapped?
/ ( root )
/content/blog/comments
/content/blog/posts
/content/blog/images

http://robert.muntea.nu @rombert
How does Sling manage this?
ResourceProvider
JCR NoSQL FS
Couchbase MongoDB
ResourceProviderFactory
Produces

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SPI → API
ResourceProviderFactory
OSGi Service Registry
ResourceResolver
Registers Gets

http://robert.muntea.nu @rombert
ResourceResolver
Resource getResource(String path);
Iterable<Resource> getChildren(Resource parent);
Iterator<Resource> findResources(String query,
String language);
Resource create(Resource parent, String name,
Map<String, Object> properties) throws
PersistenceException;
void delete(Resource resource) throws
PersistenceException;
void commit() throws PersistenceException;

http://robert.muntea.nu @rombert
How do I get to handle a Resource?
1 GET /content/blog/posts/hello_world.json
2 ResourceResolver.resolve(...)
3 ServletResolver.resolveServlet(...)3
4 servlet.doGet(...)

http://robert.muntea.nu @rombert
What do clients see out of this?
Resource res = request.getResource();
// 1. reading ...
ValueMap properties = ↵
res.getValueMap();
String title = properties.get(“jcr:title”,↵
“Missing”);
Post post = res.adaptTo(Post.class);
title = post.getTitle();

http://robert.muntea.nu @rombert
Why do we need adaptTo?
Adaptable
Resource ValueMap
Map<String,Object> Post

http://robert.muntea.nu @rombert
What do clients see out of this?
Resource res = request.getResource();
// 2. writing ...
ValueMap properties = ↵
res.adaptTo(ValueMap.class);
String title = properties.put(“jcr:title”,↵
“Hello, world”);
Post post = res.adaptTo(Post.class);
post.setTitle(“Hello, world”);
res.getResourceResolver().commit();

http://robert.muntea.nu @rombert
Oh, but there's more

http://robert.muntea.nu @rombert
More features
●
Eventing, Thread Pooling, Job Management,
Caching
●
Scripting: Groovy, Scala, JSP, Sightly, Java, Ruby,
Thymeleaf
●
Flexible resource rendering with resource types
●
Very extensible due to being internally powered
by OSGi – most extension points available to clients

http://robert.muntea.nu @rombert
Beyond the NoSQL datastores

http://robert.muntea.nu @rombert
Buzzword checklist
✔
RESTful
✔
API gateway
✔
NoSQL
✔
OSGi

http://robert.muntea.nu @rombert
Resources
●
Apache Sling – http://sling.apache.org
●
Sling NoSQL providers -
http://sling.apache.org/documentation/bundles/no
sql-resource-providers.html
●
Apache Jackrabbit Oak -
http://jackrabbit.apache.org/oak/

http://robert.muntea.nu @rombert
Resources

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Three things you will take away from the session: • How to run an effective tenant-to-tenant migration • Best practices for before, during, and after migration • Tips for using migration as a springboard to prepare for Copilot in Microsoft 365 Main ideas: Migration Overview: The presentation covers the current reality of cross-tenant migrations, the triggers, phases, best practices, and benefits of a successful tenant migration Considerations: When considering a migration, it is important to consider the migration scope, performance, customization, flexibility, user-friendly interface, automation, monitoring, support, training, scalability, data integrity, data security, cost, and licensing structure Next Wave: The next wave of change includes the launch of Copilot, which requires businesses to be prepared for upcoming changes related to Copilot and the cloud, and to consolidate data and tighten governance ShareGate: ShareGate can help with pre-migration analysis, configurable migration tool, and automated, end-user driven collaborative governance

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Apache Sling as an OSGi-powered REST middleware - Robert Munteau

1. http://robert.muntea.nu @rombert Apache Sling as a RESTful API gateway for your NoSQL datastores Apache Sling as a RESTful API gateway for your NoSQL datastores Robert Munteanu, Adobe Systems EclipseCon Europe 2015

2. http://robert.muntea.nu @rombert Who I am  $DAYJOB  Adobe Experience Manager  Apache Sling  Apache Jackrabbit  Apache Felix  FOSS  Apache Sling  MantisBT  Mylyn Connector for MantisBT  Mylyn Connector for Review Board

3. http://robert.muntea.nu @rombert Agenda ● Quick facts and figures ● Meet Barry ● Demo ● Why is Sling such a good fit for an API gateway ● Conclusions, Resources, Q&A

4. http://robert.muntea.nu @rombert Apache Sling - History 2007 Incubation 2009 TLP 2015 Version 8 200x Pre-Apache

5. http://robert.muntea.nu @rombert High-level View of the Code Source: OpenHub

6. http://robert.muntea.nu @rombert Level of activity Source: OpenHub Source: status.apache.org

7. http://robert.muntea.nu @rombert Conceptual foundations REST-based Content-driven OSGi-powered Scripting InsideApache

8. http://robert.muntea.nu @rombert REST-based /content/blog/ /content/blog/{0}.html / BlogViewController BlogListController HomeController SlingMainServlet / /content /content/blog /content/blog/hello-world

9. http://robert.muntea.nu @rombert REST-based / /content /content/blog /content/blog/hello-world [sling/redirect] [sling/redirect] [blog/welcome] [blog/page]

10. http://robert.muntea.nu @rombert Barry – Senior Buzzword Deliverer

11. http://robert.muntea.nu @rombert Demo time!

12. http://robert.muntea.nu @rombert How is everything mapped? / ( root ) /content/blog/comments /content/blog/posts /content/blog/images

13. http://robert.muntea.nu @rombert How does Sling manage this? ResourceProvider JCR NoSQL FS Couchbase MongoDB ResourceProviderFactory Produces

14. http://robert.muntea.nu @rombert SPI → API ResourceProviderFactory OSGi Service Registry ResourceResolver Registers Gets

15. http://robert.muntea.nu @rombert ResourceResolver Resource getResource(String path); Iterable<Resource> getChildren(Resource parent); Iterator<Resource> findResources(String query, String language); Resource create(Resource parent, String name, Map<String, Object> properties) throws PersistenceException; void delete(Resource resource) throws PersistenceException; void commit() throws PersistenceException;

16. http://robert.muntea.nu @rombert How do I get to handle a Resource? 1 GET /content/blog/posts/hello_world.json 2 ResourceResolver.resolve(...) 3 ServletResolver.resolveServlet(...)3 4 servlet.doGet(...)

17. http://robert.muntea.nu @rombert What do clients see out of this? Resource res = request.getResource(); // 1. reading ... ValueMap properties = ↵ res.getValueMap(); String title = properties.get(“jcr:title”,↵ “Missing”); Post post = res.adaptTo(Post.class); title = post.getTitle();

18. http://robert.muntea.nu @rombert Why do we need adaptTo? Adaptable Resource ValueMap Map<String,Object> Post

19. http://robert.muntea.nu @rombert What do clients see out of this? Resource res = request.getResource(); // 2. writing ... ValueMap properties = ↵ res.adaptTo(ValueMap.class); String title = properties.put(“jcr:title”,↵ “Hello, world”); Post post = res.adaptTo(Post.class); post.setTitle(“Hello, world”); res.getResourceResolver().commit();

20. http://robert.muntea.nu @rombert Demo time!

21. http://robert.muntea.nu @rombert Oh, but there's more

22. http://robert.muntea.nu @rombert More features ● Eventing, Thread Pooling, Job Management, Caching ● Scripting: Groovy, Scala, JSP, Sightly, Java, Ruby, Thymeleaf ● Flexible resource rendering with resource types ● Very extensible due to being internally powered by OSGi – most extension points available to clients

23. http://robert.muntea.nu @rombert Beyond the NoSQL datastores

24. http://robert.muntea.nu @rombert Buzzword checklist ✔ RESTful ✔ API gateway ✔ NoSQL ✔ OSGi

25. http://robert.muntea.nu @rombert Resources ● Apache Sling – http://sling.apache.org ● Sling NoSQL providers - http://sling.apache.org/documentation/bundles/no sql-resource-providers.html ● Apache Jackrabbit Oak - http://jackrabbit.apache.org/oak/

26. http://robert.muntea.nu @rombert Resources

Apache Sling as an OSGi-powered REST middleware - Robert Munteau

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