Dropwizard

A gentle introduction to Dropwizard - a java microservices framework

Transcript

1. A GENTLE INTRODUCTION TO
   
   DROPWIZARD
   Ran Tavory
   
   @rantav
   
   Gormim
   
   Totango
   

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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
   

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

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4. 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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5. 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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6. 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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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
   

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

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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
   

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

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11. MAVEN
    

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12. APPLICATION CLASS
    

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13. CONFIGURATION CLASS
    Reads from yml file
    

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14. CONFIGURATION FILE
    Example yml file
    

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15. REPRESENTATION CLASS
    

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16. RESOURCE CLASS
    

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17. REGISTER THE RESOURCE
    

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18. HEALTHCHECK
    

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19. HEALTHCHECK
    

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20. RUNNING
    

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21. RUNNING
    

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22. ADD COOL BANNERS
    

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

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

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

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

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

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

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