Effective web application development with Apache Sling

•

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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. This talk shows how Sling integrates various standard-based technologies, like OSGi and the Content Repository API for Java to create a coherent framework for web application development. We will walk through the development of a simple application with minimal effort and demonstrate how to productize the resulting application. We will pay special attention to some approaches which are not yet part of mainstream development, such as using OSGi for dependecy injection and JCR for persistence.

Logiciels

http://robert.muntea.nu @rombert
Effective Web Application Development with Apache Sling
Effective Web Application Development
with Apache Sling
Robert Munteanu, Adobe Systems
CodeCamp Iași 2016

http://robert.muntea.nu @rombert
Agenda
●
What is Apache Sling?
●
Content-Driven/RESTful applications
●
What can Sling do for me?
●
Demo
●
Wrap-up

http://robert.muntea.nu @rombert
What is Apache Sling?
●
What is Apache Sling?
●
Content-Driven/RESTful applications
●
What can Sling do for me?
●
Demo
●
Wrap-up

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

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

http://robert.muntea.nu @rombert
Library?

http://robert.muntea.nu @rombert
Application Server?

http://robert.muntea.nu @rombert
It’s Apache Sling!

http://robert.muntea.nu @rombert
What is Apache Sling?
Content-Driven
RESTful applications
Modularity
Less @Magic,
Fewer @Suprises
Open Source

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

http://robert.muntea.nu @rombert
Code statistics

http://robert.muntea.nu @rombert
Content-driven, RESTful applications
●
What is Apache Sling?
●
Content-Driven/RESTful applications
●
What can Sling do for me?
●
Demo
●
Wrap-up

http://robert.muntea.nu @rombert
What is a content-driven application?

http://robert.muntea.nu @rombert
What is a not a content-driven application?
●
HTTP proxy for anonymity
●
Bitcoin miners
●
Stock exchange trading

http://robert.muntea.nu @rombert
What does a content-driven application consist of?
Data Code

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What is a resource?
●
The smallest individually addressable unit
●
Minimally has a name
●
Key-value for properties
●
Optionally has a parent
●
Optionally has a child

http://robert.muntea.nu @rombert
What is a resource?
GET /news/sling/release-8.html HTTP/1.1

http://robert.muntea.nu @rombert
Resources – Blog post
/posts/hello_world.html
Title : Hello, world
Body: ...
Author [/users/admin]
Publish date: 2016-01-01T23:00:00Z
Comments [/comments/hello_world/resources]
Images [/comments/hello_world/assets]

http://robert.muntea.nu @rombert
Resources – User
/users/admin.json
Name: admin
Last logged in: 2012-05-13T12:00:00Z
Enabled: false

http://robert.muntea.nu @rombert
Resources – Image
/assets/cat_laser_pointer.jpg
Name: Cat following laser pointer. LOL!
Media type: image/jpeg
Contents: <binary>
Thumbs: [/assets/cat_laser_pointer/renditions]

http://robert.muntea.nu @rombert
Serving content – Controller-driven
@GetMethod
@AtLocation(“/users/{name}.html”)
public byte[] handleUser(String
name) { … }
map “users”
map “articles” as “news”
GET “images”

http://robert.muntea.nu @rombert
Serving content – Controller-driven
WelcomeController
/
UserController
/users
ArticleController
/articles

http://robert.muntea.nu @rombert
Serving content – resource-driven

http://robert.muntea.nu @rombert
Serving content – resource-driven
/ [sling:redirect]
content [my/site/listing]
news [my/site/listing]
sling-launchpad-8 [my/site/article]
sling-ide-tooling-11 [my/site/article]
assets [sling:Folder]
sling_logo.png [nt:file]

http://robert.muntea.nu @rombert
What can Sling do for me?
●
What is Apache Sling?
●
Content-Driven/RESTful applications
●
What can Sling do for me?
●
Demo
●
Wrap-up

http://robert.muntea.nu @rombert
Persistence using JCR

http://robert.muntea.nu @rombert
Modularity with OSGi
●
The solution we chose for modularity and services
●
Comes with lots of add-ons:
●
Eventing
●
Administrative console
●
Configuration
●
Hot deployment
●
etc
●
Forces application to handle the “real-world”
dynamics
●
Easy configuration using annotations

http://robert.muntea.nu @rombert
Pluggable repositories
JCR
MongoDB
Couchbase
Filesystem

http://robert.muntea.nu @rombert
Pluggable authentication
Oauth
Form
Oak
External
e.g. LDAP
Basic HTTP

http://robert.muntea.nu @rombert
Templating engines

http://robert.muntea.nu @rombert
Others …
●
Caching
●
Eventing
●
Logging
●
Health Checks
●
XSS protection
●
Validation

http://robert.muntea.nu @rombert
Developer Tools

http://robert.muntea.nu @rombert
Deployment options

http://robert.muntea.nu @rombert
Deployment Topologies - Standalone
Sling + Oak
Segment NodeStore
HTTP Frontend
(httpd, varnish, nginx, etc )

http://robert.muntea.nu @rombert
Deployment Topologies
HTTP Frontend
(httpd, varnish, nginx, etc )
Sling + Oak
Document NodeStore
MongoDB
Sling + Oak
Document NodeStore

http://robert.muntea.nu @rombert
Adminstrative web console

http://robert.muntea.nu @rombert
Demo
●
What is Apache Sling?
●
Content-Driven/RESTful applications
●
What can Sling do for me?
●
Demo
●
Wrap-up

http://robert.muntea.nu @rombert
Resources
●
https://sling.apache.org
●
https://jackrabbit.apache.org/oak/
●
http://www.slideshare.net/rombertw/
●
@rombert

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This presentation covers the following topics: What is logging? The purpose of logging: Debugging The purpose of logging: Security The purpose of logging: Stats & analytics Traditional logging Traditional logging: Advantages Traditional logging: Disadvantages The solution: Large-scale logging Large-scale logging: Core principles Large-scale logging: Solution types Large-scale logging: Cloud vs on-prem Large-scale logging: Operational complexity Large-scale logging: Security Large-scale logging: Costs Large-scale logging: On-prem comparison - Elasticsearch - Grafana Loki - VictoriaLogs On-prem comparison: Setup and operation On-prem comparison: Costs On-prem comparison: Full-text search support On-prem comparison: How to efficiently query 100TB of logs? On-prem comparison: Integration with CLI tools VictoriaLogs for large-scale logging VictoriaLogs demo instance - Ingestion rate: 3600 messages / minute - The number of log messages: 1.1 billion - Uncompressed log messages’ size: 1.5TB - Compressed log messages’ size: 23GB - Compression ratio: 47x - Memory usage: 150MB VictoriaLogs CLI integration demo - Which errors have occurred in all the apps during the last hour? - How many errors have occurred during the last hour? - Which apps generated the most of errors during the last hour? - The number of per-minute errors for the last 10 minutes - Status codes for the last hour - Non-200 status codes for the last week - Top client IPs for the last 4 weeks with 404 and 500 response status codes - Per-month stats for the given IP across all the logs Large-scale logging solution MUST provide excellent CLI integration VictoriaLogs: (temporary) drawbacks VictoriaLogs: Recap - Easy to setup and operate - The lowest RAM usage and disk space usage (up to 30x less than Elasticsearch and Grafana Loki) - Fast full-text search - Excellent integration with traditional command-line tools for log analysis - Accepts logs from popular log shippers (Filebeat, Fluentbit, Logstash, Vector, Promtail, Grafana Agent) - Open source and free to use!

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Effective web application development with Apache Sling

1. http://robert.muntea.nu @rombert Effective Web Application Development with Apache Sling Effective Web Application Development with Apache Sling Robert Munteanu, Adobe Systems CodeCamp Iași 2016

2. http://robert.muntea.nu @rombert Agenda ● What is Apache Sling? ● Content-Driven/RESTful applications ● What can Sling do for me? ● Demo ● Wrap-up

3. http://robert.muntea.nu @rombert What is Apache Sling? ● What is Apache Sling? ● Content-Driven/RESTful applications ● What can Sling do for me? ● Demo ● Wrap-up

4. http://robert.muntea.nu @rombert Modular

5. http://robert.muntea.nu @rombert RESTful

6. http://robert.muntea.nu @rombert Serve

7. http://robert.muntea.nu @rombert Library?

8. http://robert.muntea.nu @rombert Application Server?

9. http://robert.muntea.nu @rombert It’s Apache Sling!

10. http://robert.muntea.nu @rombert What is Apache Sling? Content-Driven RESTful applications Modularity Less @Magic, Fewer @Suprises Open Source

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

12. http://robert.muntea.nu @rombert Code statistics

13. http://robert.muntea.nu @rombert Content-driven, RESTful applications ● What is Apache Sling? ● Content-Driven/RESTful applications ● What can Sling do for me? ● Demo ● Wrap-up

14. http://robert.muntea.nu @rombert What is a content-driven application?

15. http://robert.muntea.nu @rombert What is a not a content-driven application? ● HTTP proxy for anonymity ● Bitcoin miners ● Stock exchange trading

16. http://robert.muntea.nu @rombert What does a content-driven application consist of? Data Code

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18. http://robert.muntea.nu @rombert What is a resource? GET /news/sling/release-8.html HTTP/1.1

19. http://robert.muntea.nu @rombert Resources – Blog post /posts/hello_world.html Title : Hello, world Body: ... Author [/users/admin] Publish date: 2016-01-01T23:00:00Z Comments [/comments/hello_world/resources] Images [/comments/hello_world/assets]

20. http://robert.muntea.nu @rombert Resources – User /users/admin.json Name: admin Last logged in: 2012-05-13T12:00:00Z Enabled: false

21. http://robert.muntea.nu @rombert Resources – Image /assets/cat_laser_pointer.jpg Name: Cat following laser pointer. LOL! Media type: image/jpeg Contents: <binary> Thumbs: [/assets/cat_laser_pointer/renditions]

22. http://robert.muntea.nu @rombert Serving content – Controller-driven @GetMethod @AtLocation(“/users/{name}.html”) public byte[] handleUser(String name) { … } map “users” map “articles” as “news” GET “images”

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24. http://robert.muntea.nu @rombert Serving content – resource-driven

25. http://robert.muntea.nu @rombert Serving content – resource-driven / [sling:redirect] content [my/site/listing] news [my/site/listing] sling-launchpad-8 [my/site/article] sling-ide-tooling-11 [my/site/article] assets [sling:Folder] sling_logo.png [nt:file]

26. http://robert.muntea.nu @rombert What can Sling do for me? ● What is Apache Sling? ● Content-Driven/RESTful applications ● What can Sling do for me? ● Demo ● Wrap-up

27. http://robert.muntea.nu @rombert Persistence using JCR

28. http://robert.muntea.nu @rombert Modularity with OSGi ● The solution we chose for modularity and services ● Comes with lots of add-ons: ● Eventing ● Administrative console ● Configuration ● Hot deployment ● etc ● Forces application to handle the “real-world” dynamics ● Easy configuration using annotations

29. http://robert.muntea.nu @rombert Pluggable repositories JCR MongoDB Couchbase Filesystem

30. http://robert.muntea.nu @rombert Pluggable authentication Oauth Form Oak External e.g. LDAP Basic HTTP

31. http://robert.muntea.nu @rombert Templating engines

32. http://robert.muntea.nu @rombert Others … ● Caching ● Eventing ● Logging ● Health Checks ● XSS protection ● Validation

33. http://robert.muntea.nu @rombert Developer Tools

34. http://robert.muntea.nu @rombert Deployment options

35. http://robert.muntea.nu @rombert Deployment Topologies - Standalone Sling + Oak Segment NodeStore HTTP Frontend (httpd, varnish, nginx, etc )

36. http://robert.muntea.nu @rombert Deployment Topologies HTTP Frontend (httpd, varnish, nginx, etc ) Sling + Oak Document NodeStore MongoDB Sling + Oak Document NodeStore

37. http://robert.muntea.nu @rombert Adminstrative web console

38. http://robert.muntea.nu @rombert Adminstrative web console

39. http://robert.muntea.nu @rombert Adminstrative web console

40. http://robert.muntea.nu @rombert Adminstrative web console

41. http://robert.muntea.nu @rombert Demo ● What is Apache Sling? ● Content-Driven/RESTful applications ● What can Sling do for me? ● Demo ● Wrap-up

42. http://robert.muntea.nu @rombert Resources ● https://sling.apache.org ● https://jackrabbit.apache.org/oak/ ● http://www.slideshare.net/rombertw/ ● @rombert