Dropwizard

A gentle introduction to Dropwizard - a java microservices framework

Transcript

1. A GENTLE INTRODUCTION TO DROPWIZARD Ran Tavory @rantav Gormim Totango
2. ABOUT ME • Developer developer developer • Gormim • We help developers find awesome jobs. • You should register! www.gormim.com • Totango • Previously: outbrain, google, youtube, microsoft
3. MY EXPERIENCE WITH DROPWIZARD • So far implemented 3 microsevices with DW • At Totango
4. WHAT IS DROPWIZARD? • A collection of libraries • And some glue code • Goal: • Make it easy to write (micro)services, in Java
5. MICROSERVICES, YEAH • Goal: easy to create new services • Goal: simple to use • Goal: easy to deploy • Goal: easy to monitor, manage • devops friendly
6. DROPWIZARD IS OPINIONATED* • Jetty for HTTP • Jersey for REST (JAX-RS) • Jackson for JSON • Metrics for metrics • SLF4J, Logback for logging
7. … IS OPINIONATED* • Guava b/c it’s useful • Hibernate Validator (JSR-303) for data validation • Apache HTTP Client for low level HTTP • Jersey HTTP client for high level HTTP • jDBI for relational databases • Liquibase for DB schema maintenance
8. … IS OPINIONATED* • Freemarker and Mustach for templating • Joda Time
9. *SOME MODULARITY IN PLACE • Maven artifacts: • dropwizard-core! • dropwizard-client (http client) • dropwizard-jdbi! • dropwizard-migrations (liquibase) • dropwizard-hibernate! • dropwizard-auth (HTTP basic and oauth2) • dropwizard-views- mustache and dropwizard-views- freemarker! • dropwizard-scala! • dropwizard-testing
10. GETTING STARTED • Maven • Application class • Configuration class • Representation class (optional) • Resource class (optional) • Healthcheck
11. MAVEN
12. APPLICATION CLASS
13. CONFIGURATION CLASS Reads from yml file
14. CONFIGURATION FILE Example yml file
15. REPRESENTATION CLASS
16. RESOURCE CLASS
17. REGISTER THE RESOURCE
18. HEALTHCHECK
19. HEALTHCHECK
20. RUNNING
21. RUNNING
22. ADD COOL BANNERS
23. OPS FRIENDLY • Now you can access the following URLs: • /ping • /healthcheck • /metrics • /threads
24. EXTRA • Nice test support. • Validation • Servlets, Filters • Custom Representations • HTML Views
25. EXTRA • Streaming output • Caching • Error Handling • SSL • Logging
26. EXTRA • Metrics and Metrics Reporters • Commands (CLI) • Tasks (admin HTTP interface) • Managed Objects
27. SUMMARY • Pros: • Easy, simple • Performant • ops friendly • Opinionated • No web container • Community! • Cons: • Opinionated • Eran will say more ;-)
28. REFS • https://dropwizard.github.io/dropwizard/ • http://martinfowler.com/articles/microservices.html