Dropwizard introduction presentation slide for TWJUG Sep. event.

1. Dropwizard
-微服務架構框架-
anthonychen

2. Once Upon a Time
Hibernate
Tomcat
Spring
JPA
Spring
MVC
Jackson
Freemarker
or
Thymeleaf
Logback

3. Dropwizard
Full Stack Framework
with microservice architecture

4. Drop...wizard?

6. Jackson
mustache
JDBI
Full Stack, RESTful and Open Source

7. Dropwizard Modules (v0.7.1)
dropwizard-assets dropwizard-jackson dropwizard-migrations
dropwizard-auth dropwizard-jdbi dropwizard-servlets
dropwizard-client dropwizard-jersey dropwizard-spdy
dropwizard-configuration dropwizard-jetty dropwizard-testing
dropwizard-core dropwizard-lifecycle dropwizard-util
dropwizard-db dropwizard-logging dropwizard-validation
dropwizard-example dropwizard-metrics-ganglial dropwizard-views-freemarker
dropwizard-forms dropwizard-metrics-graphite dropwizard-views-mustache
dropwizard-hibernate dropwizard-metrics dropwizard-views

8. Microservice
Architecture
The microservice architectural
style is an approach to
developing a single application as
a suite of small services, each
running in its own process and
communicating with lightweight
mechanisms, often an HTTP
resource API. These services are
built around business capabilities
and independently deployable by
fully automated deployment
machinery.
- Martin Fowler

9. Monolithic Micro Services
pid 1234 8GB heap
pid 5678
2GB heap
pid 5978
2GB heap
pid 1234
2GB heap
pid 9527
2GB heap

10. Scalability

11. Project Management

12. P
R
O
X
Y
Extensibility

13. Phlyty
a microframework using ZF2 components.
SleepyA RESTful framework for Go
Microservice Frameworks

14. Why
DropWizard?

15. http://www.oracle.com/us/technologies/java/gimmejava/usage-terms/index.html

16. Dropwizard - Pros
Productivity – Do one thing at a time
Do your best with what you have
Simple & Lightweight
Easy Test, Deployment and Management
Performance

17. Dropwizard - Pros
Productivity – Do one thing at a time
Do your best with what you have
Simple & Lightweight
Easy Test, Deployment and Management
Performance

18. http://www.techempower.com/benchmarks/#section=data-r9&hw=i7&test=json&f=311c-1hq8-0-0

19. http://www.techempower.com/benchmarks/#section=data-r9&hw=i7&test=db&f=311c-1hq8-0-0

20. http://www.techempower.com/benchmarks/#section=data-r9&hw=i7&test=query&f=311c-1hq8-0-0

21. Dropwizard - Cons
Frequently and Large-Scale Changes
Nano-Service Architecture
Complexity at Infrastructure Level
No Application Server
Put More Effort on Monitoring and

22. How to Start
DropWizard?

23. Overview
Resource
Application Bundle
Configuration
Representation
Environment
Views

24. Project Orginization
com.example.myapplication:
 api: Representations.
 cli: Commands
 client: Client implementation for your application
 core: Domain implementation
 jdbi: Database access classes
 health: Health Checks
 resources: Resources
 MyApplication: The application class
 MyApplicationConfiguration: configuration class

25. Configuration Class
public class BlogConfiguration extends Configuration {
@Valid
@NotNull
@JsonProperty("database")
private DataSourceFactory database = new DataSourceFactory();
public DataSourceFactory getDatabase() {
return database;
}}

26. Configuration File
(YAML)
server:
type: simple
applicationContextPath: /application
adminContextPath: /admin
database:
driverClass: com.mysql.jdbc.Driver
user: anthonychen
password: anthonychen
url: jdbc:mysql://localhost:3306/blog
validationQuery: "/* MyApplication Health Check */ SELECT 1"

27. Representation Class
public class Notification {
private String text;
public Notification(String text) {
this.text = text;
}
@JsonProperty
public String getText() {
return text;
}
@JsonProperty
public void setText(String text) {
this.text = text;
}}

28. Application Class - Bundle
public class BlogApplication extends Application<BlogConfiguration> {
public static void main(String[] args) throws Exception {
new BlogApplication().run(args);
}
@Override
public void initialize(Bootstrap<BlogConfiguration> bootstrap) {
bootstrap.addBundle(hibernateBundle);
bootstrap.addBundle(new ViewBundle());
bootstrap.addBundle(new AssetsBundle("/assets/js", "/js", null, "js"));
}}

29. Application Class – Environment
@Override
public void run(BlogConfiguration configuration, Environment environment) throws Exception {
// Crete DAOs
final ArticleDAO articleDAO = new ArticleDAO(hibernateBundle.getSessionFactory());
final UserDAO userDAO = new UserDAO(hibernateBundle.getSessionFactory());
// Create healthchecks
final SessionFactoryHealthCheck dbHealthCheck = new SessionFactoryHealthCheck(
hibernateBundle.getSessionFactory(), configuration.getDatabase().getValidationQuery()
);
// Register resources, filters and healthchecks
environment.jersey().register(new BlogResource(configuration.getSiteName(), articleDAO));
environment.jersey().register(new ArticleResource(articleDAO, userDAO));
environment.healthChecks().register("databaseHealthcheck", dbHealthCheck);
}}

30. View Layer
Freemarker - http://freemarker.org
Mustache - http://mustache.github.io

31. Health Check
public class DatabaseHealthCheck extends HealthCheck {
private final Database database;
public DatabaseHealthCheck(Database database) {
this.database = database;
}
@Override
protected Result check() throws Exception {
if (database.isConnected()) {
return Result.healthy();
} else {
return Result.unhealthy("Cannot connect to " + database.getUrl());
}
}
}

32. Demo-
A Sample Blog

33. Build - A Fat JAR
An easy maintainable, single deployable
artifact
maven-shade or maven-assembly-plugin

34. Run
Command line:
java -jar blog-sample-0.0.1-SNAPSHOT.jar server blog.yml
exec-maven-plugin

35. More
DropWizard?

36. Metric

37. AngularJS &
DropWizard

38. Spring &
DropWizard