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Dropwizard
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Ran Tavory
October 15, 2014
Programming
3
520
Dropwizard
A gentle introduction to Dropwizard - a java microservices framework
Ran Tavory
October 15, 2014
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Transcript
A GENTLE INTRODUCTION TO DROPWIZARD Ran Tavory @rantav Gormim Totango
ABOUT ME • Developer developer developer • Gormim • We
help developers find awesome jobs. • You should register! www.gormim.com • Totango • Previously: outbrain, google, youtube, microsoft
MY EXPERIENCE WITH DROPWIZARD • So far implemented 3 microsevices
with DW • At Totango
WHAT IS DROPWIZARD? • A collection of libraries • And
some glue code • Goal: • Make it easy to write (micro)services, in Java
MICROSERVICES, YEAH • Goal: easy to create new services •
Goal: simple to use • Goal: easy to deploy • Goal: easy to monitor, manage • devops friendly
DROPWIZARD IS OPINIONATED* • Jetty for HTTP • Jersey for
REST (JAX-RS) • Jackson for JSON • Metrics for metrics • SLF4J, Logback for logging
… 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
… IS OPINIONATED* • Freemarker and Mustach for templating •
Joda Time
*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
GETTING STARTED • Maven • Application class • Configuration class
• Representation class (optional) • Resource class (optional) • Healthcheck
MAVEN
APPLICATION CLASS
CONFIGURATION CLASS Reads from yml file
CONFIGURATION FILE Example yml file
REPRESENTATION CLASS
RESOURCE CLASS
REGISTER THE RESOURCE
HEALTHCHECK
HEALTHCHECK
RUNNING
RUNNING
ADD COOL BANNERS
OPS FRIENDLY • Now you can access the following URLs:
• /ping • /healthcheck • /metrics • /threads
EXTRA • Nice test support. • Validation • Servlets, Filters
• Custom Representations • HTML Views
EXTRA • Streaming output • Caching • Error Handling •
SSL • Logging
EXTRA • Metrics and Metrics Reporters • Commands (CLI) •
Tasks (admin HTTP interface) • Managed Objects
SUMMARY • Pros: • Easy, simple • Performant • ops
friendly • Opinionated • No web container • Community! • Cons: • Opinionated • Eran will say more ;-)
REFS • https://dropwizard.github.io/dropwizard/ • http://martinfowler.com/articles/microservices.html