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Dropwizard
production ready restful web services…
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... for java
… for java
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preamble
… the case for dropwizard
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Dropwizard is an exemplar for
ops-friendly, self contained, high
performing, framework-less web
service building technologies
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… written in java
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The concepts, principles &
patterns contained herein can
and should be applied to any
services you build irrespective of
technology or language
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“micro service architecture”
bit.ly/187C3Le
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The rise of real service oriented
architecture has meant that
services are now an acceptable
level of abstraction for defining
system features
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“ the world needs devops”
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develop ⇝ deploy ⇝ disaster
a typical release pipeline
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When things go smoothly our
initial reaction is one of surprise
followed by suspicion
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develop ⇝ deploy ⇝ disaster
its their fault!
they don’t get it!
what the hell is this
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news flash!
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You are not writing code for your
own gratification
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You are trying to make others
lives better
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Your code and infrastructure will
fail a lot
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You are not in competition with
other departments
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You need a shared understanding
of system behaviour
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DEAL WITH IT!
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Dropwizard provides a set of
features that enable you to build
systems capable of adapting to,
both, a changing business and
operational domain
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Dropwizard
the actual topic of the talk
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Dropwizard is a Java framework
for developing ops-friendly, high-
performance, RESTful web
services.
http://dropwizard.io
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A damn simple library for building
production-ready RESTful web
services
github.com/dropwizard/dropwizard
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It's a little bit of opinionated glue
code which bangs together a set
of libraries which have historically
not sucked
github.com/dropwizard/dropwizard
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Jetty
Jersey
Jackson
Metrics
HTTP Library
REST Library
JSON Processor
Instrumentation
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Guava Immutable Collections & Utils
Logback
Freemarker & Mustache
JodaTime
Hibernate Validator
JDBI & Liquibase
Logging
Validation
Data Access & Migration
Templating
Non-Terrible Time
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- Java is Java
- Annotations are awful
- Documentation is dispersed
The “Nobody’s Perfect”
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1. Create Configuration YML & Class
2. Create the Service
3. Create the Representation
4. Create & Register the Resource
5. Build & Run
Lets Build a Service!!!
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I could have done this with
Rails, Sinatra, Spring, Play,
Finagle, Express, Nancy.…
So What?
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The Admin Server
Metrics
Healthchecks
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class DBManager implements Managed {
public void start() { … }
public void stop() { … }
}
// register in Service.initialize()
environment.manage(myDBManager)
Managed Objects
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Commands
// register in Service.initalize()
bootstrap.addCommand(myCommand)
> java -jar app.jar dingus
class DingusCommand implements Command {
public void configure(parser) { … }
public void run(bootstrap, ns) { … }
}
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Tasks
// register in Service.run()
environment.addTask(myTask)
> curl -X POST http://server/tasks/dingus
class DingusTask implements Task {
public void execute(params, out) { … }
}
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Bundles
@Override
public void initialize(bootstrap) {
bootstrap.addBundle(
new AssetsBundle("/assets/", "/"));
}
Reusable modules of functionality
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import static com.yammer.dropwizard
.testing.JsonHelpers.*;
Testing (Fixtures)
!
jsonFixture(“fixtures/person.json”)
!
fromJson(myFixture, Person.class)
!
asJson(person)
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Testing (Resources)
client().resource(“user/1”).get(User.class)
public class MyTest extends ResourceTest {
!
@Override
protected void setUpResources() {
addResource(...);
}
}
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Views
Data Access
Authentication
Migrations
Banners
etc…
More Other Things & Stuff
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Dropwizard
production ready restful web services…