This document discusses deploying and scaling Java applications on Heroku, a platform as a service (PaaS) that hosts applications in the cloud. Some key points: - Heroku allows developers to run any programming language and focuses on innovation rather than infrastructure maintenance. - Applications are deployed as isolated units called dynos that can be scaled horizontally. Logging and metrics are centralized. - The platform provides services for load balancing, managing processes, and extending functionality through add-ons. - Best practices include building stateless, self-contained applications that can be deployed across dynos and adopt a "12 factor app" methodology.

1. Java on Heroku
Deploying and Scaling on the Cloud

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3. Cloud
Application
Trends

4. Continuous Delivery
“..reducing the cycle time between an idea and usable
software”
- Martin Fowler
“Software delivers no revenue until it is in the hands of
its users.”
-Jez Humble
“.. leads to deeper relationship between IT, their
business customer, and their final customers.”
-Jez Humble

5. Anti-Patterns

6. Monolithic > Micro apps
- Slower
Releases
Web App -1 Web App -2 - Memory footprint
- “noisy” neighbour
Scheduled MDBs EJBs
Jobs - Single
Language
Session Managers Message Listeners
Clustering M&M
App Server Core
JVM

7. Monolithic > Micro apps
+ Faster
Web App 1 Web App 2
Releases
+ Isolation
JVM / Container JVM / Container
+ Small Optimized
Apps
+ Scale independently
Message Batch
Driven apps Jobs + Composite Apps
JVM / Container JVM / Container + Polyglot Architecture
Cloud Services
Cloud icon – courtesy from The Noun Project collection

8. One language >
Polyglot
Presentation Tier
(JSP, JSF, Struts)
Business Logic Tier
(Java)
Data Tier
RDBMS
- No one size fits all
- Lower productivity

9. One platform > Polyglot
Presentation Tier Presentation Tier
(JSP, JSF,, Struts) (Rails, HTML5..)
Business Logic Tier Business Logic Tier
(Java) (Java, Scala, NodeJS)
Data Tier Data Tier
(RDBMS) RDBMS, NoSQL
+ Productivity
+ Language strengths
+ Performance

10. Application UIs > APIs
Application UI
(Browser)
Business Logic
Data Tier
- SOAP
- Single Viewport
- Stateful apps

11. Application UI > APIs
Application UI Application UI Mobile / Tablets
Devices
(Browser) (Browser) (Java,iOS)
Business Logic Business Logic API
Data Tier Data Tier
+ JSON
+ Multi-Device
+ Stateless apps
+ Monetization

12. Stateful > Stateless
Sticky State Load Balancer
App App App
Server Server Server
1 1 1
Sessio Sessio Sessio
n n n
- No continuous deployment
- Memory footprint
- Less elastic

13. Stateful > Stateless
Sticky State Load Balancer Load Balancer
App App App
Server Server Server App App App
1 1 1
Sessio Sessio Sessio
n n n
Distributed Cache
+ Continuous Deployment
+ Lower memory footprint
+ Elastic Scale

14. App Server >
HTTP
Applications
Container
- Dev / Production Parity
- Complex packaging / deployment

15. App Server >
Applications
Environment
HTTP
Component
+ simplified packaging & deployment
+ Simplified application start
+ Dev / Prod parity & Environments

16. Config > Environments
Resource Configuration
Application Code
JVM Property
JNDI Property
Multiple build artifacts by
env
Datasources

17. Config > Environments
DB_URL=jdbc://.. /DBDev
Resource Configuration
SFDC_OAUTH=DE
V App
Application Code
JVM Property
JNDI Property
Dev, Prod
Multiple build artifacts by
env
Datasources
Environment Variable:
DB_URL=jdbc://postgres….
App will access the URL with:
System.getenv(“DB_URL”)

18. Mdlwr > Cloud Services
Application Code
Email Services
Databases
Databases
- Infrastructure not
innovation
- Maintenance overheads
- Productivity

19. Mdlwr > Cloud Services
Send Grid
DB_URL
Application Code
PubNub
Email Services PUB_URL.. App
Databases
Databases
Dev, Prod
Papertrail
..URL..
+ Focus on innovation
+ Rapid prototyping
+ Lower maintenance overheads

20. INTRO TO HEROKU

21. Building Cloud Apps

22. IaaS Reduces Costs
Traditional On-Premise Infrastructure as a
Development Service
Your Apps
Software Stack Software Stack
Mobile Server Mobile Server
Web Server Web Server
Software App Server App Server
Infrastructure Hyper V Server Hyper V Server
(Slow) Security Server Security Server
Operating System Operating System
Increase server utilization
Hardware
Infrastructure Reduce server costs
(Expensive)
Ease server administration

23. Still have stack
Infrastructure as a
Service
management
Your Apps
Software Stack
Mobile Server You still manage the software stack
Web Server
Software
Infrastructure
App Server You still upgrade and patch
Hyper V Server
(Slow)
Security Server
You still manually scale, tune and back-up
Operating System
Hardware
Infrastructure
(Expensive)

24. Run Forget See Trust &
Anything Servers Everything Manage

25. Run anything
HTML5 CometD
JavaScript
Django Perl
NoSQL Apex
Ruby Groovy
Spring Roo
MongoDB
SOQL Grails Scala
Play ! Hibernate Python
Spring MVC Clojure
Java NodeJS Rails PHP

26. Run anything
pol·y·glot [pol-ee-glot]
adjective
1. able to speak or write several languages; multilingual.
2. containing, composed of, or written in several languages: a
polyglot Bible.

27. Trust & Manage Forget Servers
Elastic Load
balancing
Dyno manifold
• Virtualized Linux Dyno manifold
containers (LxC)
• Dynos are fully
isolated from
each other
• Erosion resistant

28. See
Everything
Elastic Load
balancing
Logplex
• Real time Dyno manifold
stream of all
your
application
events
• Consumable Logplex
by 3rd party
services or
syslog drains

29. See
Everything
Elastic Load
balancing
API
• Process status Dyno manifold
Control Surface
• Manage your
processes
API
• Scale up or
down your
apps Logplex
Clients:
• CLI
• Eclipse plugin
• Apps

30. Elastic Load
balancing
Addons
• Extend the Dyno manifold
Control Surface
Platform
• Pre-Installed
API
Services
• Common
Components Logplex
Addons

31. Trend You will be building
Micro apps Web app, API
service
Cloud Services PubNub, Papertrail
Environments Salesforce Oauth
Stateless Distributed sessions w/Memcache
Containerless Webapp-runner

32. 12 Factor App
http://www.12factor.net