Dropwizard - Speaker Deck

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A GENTLE INTRODUCTION TO DROPWIZARD Ran Tavory @rantav Gormim Totango

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ABOUT ME • Developer developer developer • Gormim • We help developers ﬁnd awesome jobs. • You should register! www.gormim.com • Totango • Previously: outbrain, google, youtube, microsoft

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MY EXPERIENCE WITH DROPWIZARD • So far implemented 3 microsevices with DW • At Totango

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WHAT IS DROPWIZARD? • A collection of libraries • And some glue code • Goal: • Make it easy to write (micro)services, in Java

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MICROSERVICES, YEAH • Goal: easy to create new services • Goal: simple to use • Goal: easy to deploy • Goal: easy to monitor, manage • devops friendly

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DROPWIZARD IS OPINIONATED* • Jetty for HTTP • Jersey for REST (JAX-RS) • Jackson for JSON • Metrics for metrics • SLF4J, Logback for logging

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… 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

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… IS OPINIONATED* • Freemarker and Mustach for templating • Joda Time

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*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

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GETTING STARTED • Maven • Application class • Conﬁguration class • Representation class (optional) • Resource class (optional) • Healthcheck

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MAVEN

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APPLICATION CLASS

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CONFIGURATION CLASS Reads from yml ﬁle

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CONFIGURATION FILE Example yml ﬁle

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REPRESENTATION CLASS

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RESOURCE CLASS

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HEALTHCHECK

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HEALTHCHECK

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RUNNING

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RUNNING

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ADD COOL BANNERS

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OPS FRIENDLY • Now you can access the following URLs: • /ping • /healthcheck • /metrics • /threads

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EXTRA • Nice test support. • Validation • Servlets, Filters • Custom Representations • HTML Views

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EXTRA • Streaming output • Caching • Error Handling • SSL • Logging

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EXTRA • Metrics and Metrics Reporters • Commands (CLI) • Tasks (admin HTTP interface) • Managed Objects

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SUMMARY • Pros: • Easy, simple • Performant • ops friendly • Opinionated • No web container • Community! • Cons: • Opinionated • Eran will say more ;-)

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REFS • https://dropwizard.github.io/dropwizard/ • http://martinfowler.com/articles/microservices.html