Simple REST with Dropwizard
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This document provides an overview of using Dropwizard, an open-source Java framework, to build RESTful web services. It discusses REST concepts like resources and representations, REST verbs like GET and POST, and architectures for REST APIs. It then introduces Dropwizard and its components for building HTTP services with features like Jetty, Jersey, Jackson, and metrics support. The document demonstrates a sample Dropwizard TODO list application with REST endpoints and resources and discusses considerations for development, testing, and deployment.
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Simple REST with Dropwizard
- 1. Simple REST with Dropwizard Intro, Structure, Resources, Deployment Bucharest JUG #5 @ Cegeka
- 2. Andrei Savu Founder @ Axemblr.com Apache Whirr PMC member jclouds committer Connect with me on LinkedIn
- 4. REST (Representation State Transfer) Browser Analogy: Fetch representation of the current state of a resource (page) Makes extensive use of HTTP semantics
- 5. Resource & Representation Resource = the real thing Representation = server responses "A request interacts with a resource and receives a representation."
- 6. REST Verbs Match HTTP semantics: ● GET : read resources, safe, cache friendly ● POST : update resources, create ● PUT : replace entire resource, atomic ● DELETE : delete entire resource, atomic ● HEAD ● PATCH
- 7. REST Batch Operations A request can act on a single resource or a class of resources. E.g. POST /todos/1 {'email', '[email protected]'} POST /todos?email=x {'email': '[email protected]'}
- 8. REST Transport HTTP With representations as JSON or XML Negotiation with Accept & Content-Type headers Supports caching, If-Modified-Since queries
- 9. Architectures #1 Web UI Database API
- 10. Architectures #2 Web UI API Database Mobile
- 11. Architectures #3 Web UI Database Internal API Platform Queues APIs Mobile Other
- 12. Dropwizard Thanks Yammer (Coda Hale) for making it open source! Framework for JVM-based backend services "Dropwizard has out-of-the-box support for sophisticated configuration, application metrics, logging, operational tools, and much more, allowing you and your team to ship a production-quality HTTP+JSON web service in the shortest time possible."
- 13. Components ● Jetty for HTTP ● Jersey for REST ● Jackson for JSON ● Metrics for metrics ● And: guava, logback, hibernate validator, jersey client libraries, jdbi, freemarker http://dropwizard.codahale.com/getting-started/
- 14. Demo Application Structure, Configuration, Deployment
- 15. Specification "A simple todo list sample application implemented using Dropwizard as the core framework with a simple UI that consumes the REST API based on twitter bootstrap, backbone.js, jquery and jasmine." https://github.com/bucharest-jug/dropwizard-todo
- 16. REST Endpoints GET /todos | GET /todos/{id} POST /todos PUT /todos/{id} DELETE /todos | DELETE /todos/{id}
- 17. Resources: Todo List ● id : assigned by server on creation (Read Only) ● created : assigned on creation ● email: owner email address ● items: list of items
- 18. Resources: Todo Item ● title: a text description of what need to be done ● created: date time assigned on creation ● finished: date time assigned when the item was finished
- 19. To the IDE! Structure, Configuration, Testing
- 20. Production Configuration Dedicated repository with restricted access. Cool tool: etckeeper (debian)
- 21. Deployment: Start Simple Run tests on the local machine Fabric / Capistrano Supervisor / Upstart Monit Ganglia / Nagios / Cloudwatch / SNS
- 22. Deployment: Automate Continuous Integration Puppet / Chef 1-step deployment from a specific branch Ability to rebuild from a vanilla OS install Leverage cloud infrastructure for Dev & QA
- 23. Deployment: Continuous High quality test suite (unit + live + smoke) Continuous Deployment Pipeline All new code is deployed to multiple environments and production. OpenAgile Timisoara anyone?
- 24. Resources ● Demo code: https://github.com/bucharest-jug/dropwizard-todo ● All about Dropwizard: http://dropwizard.codahale.com/ ● API Grove: API management: http://apigrove.net/