Eberhard Wolff

Freelance Consultant / Trainer Head Technology Advisory Board

adesso AG

Eberhard Wolff - @ewolff

HISTORY & ORIGIN

Eberhard Wolff - @ewolff

History & Origin § Originally started as Ruby PaaS

§ Now: Support for Node.js, Clojure, Grails, Scala and Python

§ Acquired by Salesforce.com

Eberhard Wolff - @ewolff

Programming Model § Jetty, Tomcat or Play! web server § Worker for background activities

§ Standard Java Programming Model

Eberhard Wolff - @ewolff

Scaling / High Availability § Servers must be manually started for

scaling

§ Failed servers will be restarted

Eberhard Wolff - @ewolff

TOOLS

Eberhard Wolff - @ewolff

Command Line Tool § heroku § E.g. creates new applications § Other management functions

o  addons o  logs o  etc.

Eberhard Wolff - @ewolff

Deployment §  heroku tool creates an empty git repository § Deploy new versions with git §  Build (maven) done by Heroku §  Build automatically deployed § No specialized tools needed – git is enough §  Integration with Atlassian Bamboo or Travis

possible

§ Alternative: WAR deployment

Eberhard Wolff - @ewolff

DEMO

Eberhard Wolff - @ewolff

Code Changes Took the Spring application Converted to PostgreSQL <bean class="java.net.URI" id="dbUrl"> <constructor-arg value="#{systemEnvironment['DATABASE_URL']}" /></bean><bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> <property name="url" value="#{ 'jdbc:postgresql://' + @dbUrl.getHost() + í ':' + @dbUrl.getPort() + @dbUrl.getPath() }" /> <property name="username" value="#{ @dbUrl.getUserInfo().split(':')[0] }" /> <property name="password" value="#{ @dbUrl.getUserInfo().split(':')[1] }" /></bean>

Eberhard Wolff - @ewolff

Eberhard Wolff - @ewolff

Eberhard Wolff - @ewolff

Eberhard Wolff - @ewolff

Alternative: Eclipse PlugIn or Web

Eberhard Wolff - @ewolff

Full Stack Java EE No Java EE build pack available Would need WAR with Java EE libs Problem: JNDI DataSource

Eberhard Wolff - @ewolff

FLEXIBILITY

Eberhard Wolff - @ewolff

Flexibility § Dynos: processes run on Heroku § Procfile defines command line to start a

“Dyno” § Can be tuned and changed

§ Can create custom “Buildpack” to run entirely different environments

§ Available as Open Source e.g. for Ruby, PHP, Erlang, EmacsLisp…

Eberhard Wolff - @ewolff

Restrictions § Max source and build artifact size:

200MB § No sticky sessions § Dynos may not use more than

512MB RAM § I.e. max JVM heap about 400MB

Eberhard Wolff - @ewolff

PLATFORM AND OTHER SERVICES

Eberhard Wolff - @ewolff

Platform § Amazon Web Services § US East region § EU West beta § Proven foundation § Can use AWS resources as part of the

solution § 750h per month free

Eberhard Wolff - @ewolff

Other Services § Heroku supports Add-ons § Postgresql and memcached by

Heroku § Many 3rd party § E.g. relational databases, NoSQL

databases, logging, caches… § Configuration passed to service via

environment variables

Eberhard Wolff - @ewolff

Heroku: Highlights § Very flexible: Supports many

different environments

§ Broad range of additional services

§ Also covers build § https://github.com/ewolff/news-

application-heroku