Portland Java User Group May 15, 2012

1. Production Ready Web
Services with Dropwizard
Portland Java User Group
May 15, 2012
Sean Sullivan

2. http://twitter.com/hipsterhacker/status/193559234259075074

4. • Gilt Groupe
• Dropwizard project
• Dropwizard at Gilt

5. Gilt Groupe

6. online retailer

7. May 2011

8. April 2012

9. What does Gilt sell?

10. Apparel

14. Kids toys and apparel

16. Home furnishings

18. Food

20. Local deals

22. Travel

24. Gilt technology

25. Portland NYC Dublin

27. Service oriented architecture

28. email service
product service
shopping cart service
checkout service
payment service

29. internal “service framework”
image credit: dealwithitportland.com

30. Dropwizard

33. “Dropwizard consists mostly of glue code
to automatically connect and configure
these components”
• Jetty • logback
• Jersey • Yammer Metrics
• Jackson • Google Guava
• JDBI • Hibernate Validator

34. Dropwizard modules
• dropwizard-core • dropwizard-scala
• dropwizard-client • dropwizard-views
• dropwizard-db • dropwizard-testing
• dropwizard-auth

35. <dependencies>
<dependency>
<groupId>com.yammer.dropwizard</groupId>
<artifactId>dropwizard-core</artifactId>
<version>0.4.0</version>
</dependency>
<dependency>
<groupId>com.yammer.dropwizard</groupId>
<artifactId>dropwizard-scala</artifactId>
<version>0.4.0</version>
</dependency>
</dependencies>
Maven pom.xml

36. +
Java services extend
com.yammer.dropwizard.Service

37. +
Scala services extend
com.yammer.dropwizard.ScalaService

38. Service configuration

39. YAML + config class

40. import com.yammer.dropwizard.config.Configuration;
public class MyServiceConfiguration
extends Configuration {
// your config stuff
}

41. Other config
• com.yammer.dropwizard.config.HttpConfiguration
• com.yammer.dropwizard.config.LoggingConfiguration
• com.yammer.dropwizard.db.DatabaseConfiguration

42. Hello world

44. Compile and run
$ git clone git://github.com/sullis/dropwizard-helloworld.git
$ cd dropwizard-helloworld
$ mvn clean package
$ ./bin/dev.sh

45. http://localhost:8080/helloworld?name=Portland

46. Dropwizard at Gilt

47. gift certificate service
fraud service

48. Gift certificate demo

49. dropwizard-gilt
• Jackson ObjectMapper configuration
• Log4j appender config
• ZooKeeper registration
• MessagingManager class

50. Hibernate Validator + Scala case classes
https://groups.google.com/d/topic/dropwizard-user/sGEi3i8W1tY/discussion

51. https://twitter.com/#!/cowtowncoder/status/198167133887266816

52. SOA challenges
• deployment
• QA
• monitoring
• debugging

53. Questions?

54. THE END

55. Bonus slides

56. “Monitoring and QA are the same thing.You'd never think so until
you try doing a big SOA. But when your service says "oh yes, I'm
fine", it may well be the case that the only thing still functioning in
the server is the little component that knows how to say "I'm
fine, roger roger, over and out" in a cheery droid voice. In order to
tell whether the service is actually responding, you have to make
individual calls.The problem continues recursively until your
monitoring is doing comprehensive semantics checking of your
entire range of services and data, at which point it's
indistinguishable from automated QA”
Steve Yegge, October 2011
http://bit.ly/pityk6

57. “If you have hundreds of services, and your code MUST
communicate with other groups' code via these services, then
you won't be able to find any of them without a service-
discovery mechanism. And you can't have that without a
service registration mechanism, which itself is another service.
So Amazon has a universal service registry where you can find
out reflectively (programmatically) about every service, what
its APIs are, and also whether it is currently up, and where”
Steve Yegge, October 2011
http://bit.ly/pityk6