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Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Spring Data REST Data Meets Hypermedia By Greg Turnquist, Roy Clarkson, Oliver Gierke

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2 Hypermedia is an adventure You only need a few tools But the results can be amazing

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Oliver Gierke • Spring Data master • Spring HATEOAS • Jürgenized • Drums, music, … 5 @olivergierke

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What is Spring Data REST? • Implements common patterns on top of repositories • Collection / Item resources • Association resources • Search resources • Supports • JPA, GemFire, Neo4j, MongoDB • Others are coming… 6

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What is Spring Data REST? • Leverages hypermedia & internet standards • HAL (draft) • ALPS (draft) • URI Templates (RFC 6570) • text/uri-list mediatype (RFC 2483) • profile link relation (RFC 6906) 8 You aren’t building a “Spring Data REST” app, but instead a RESTful standards- based app.

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9 HAL

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10 Hypertext Application Language A lean hypermedia type application/hal+json HAL Adopting HAL will make your API explorable, and its documentation easily discoverable from within the API itself. — Mike Kelly, HAL spec lead

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11 haltalk.herokuapp.com HAL

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What is Spring Data REST? • What is ALPS? 12

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Greg Turnquist • Spring Data REST • Spring Boot • Spring anything… • Getting started guides 13 Learning Spring Boot @gregturn

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Architecture 14 GET /api Spring-a-Gram MVC SQL Spring Data Spring Mobile Spring Android Spring Hateoas Spring Framework

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Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Demo: Spring-a-Gram

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Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Spring Data REST Data Meets Hypermedia By Greg Turnquist, Roy Clarkson, Oliver Gierke

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Hi, my name is Roy Clarkson 17 @royclarkson

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18 Demo Spring-a-Gram Demo

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Built with Spring components 19 Spring for Android Spring HATEOAS

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What problem are we trying to solve? 20

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Android REST client • Consistent programming model • Powerful • Extensible 21

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Spring Framework vs Spring for Android • Core • RestTemplate 22 https://github.com/spring-projects/spring-android http://projects.spring.io/spring-android

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HTTP Methods • DELETE - delete(...) • GET - getForObject(...) • HEAD - headForHeaders(...) • OPTIONS - optionsForAllow(...) • POST - postForLocation(...) • PUT - put(...) • any HTTP operation - exchange(...) and execute(...) 23

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RestTemplate Example 24 RestTemplate restTemplate = new RestTemplate();! String url = "http://example.com/hotels/{hotel}/bookings/{booking}";! String result = restTemplate.getForObject(url, String.class, "42", “21”);!

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HTTP Message Converters • MappingJackson2HttpMessageConverter - object to JSON marshaling supported via the Jackson JSON Processor • GsonHttpMessageConverter - object to JSON marshaling supported via Google Gson • SimpleXmlHttpMessageConverter - object to XML marshaling supported via the Simple XML Serializer 25

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Spring for Android 2.0.0.M1 • Generics • OkHttp • API parity • Dependency updates • Bug fixes • Based on Spring Framework 3.2.x 26

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Supported Android Versions 27 https://developer.android.com/about/dashboards/index.html

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HTTP Clients • Native • Standard J2SE facilities (UrlConnection) • HttpComponents HttpClient 4.1 • Third Party • OkHttp • HttpComponents HttpClient 4.3 28

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Generics 29 ParameterizedTypeReference> typeRef =! new ParameterizedTypeReference>() { };! ! ResponseEntity> responseEntity = ! restTemplate.exchange(url, HttpMethod.GET, requestEntity, typeRef);

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Project Roadmap • HttpComponents 4.3 • AsyncRestTemplate • Improved Spring Social integration • Improved Spring HATEOAS integration • WebSocket • Differential Sync 30

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Getting Started Guides at http://spring.io/guides • Consuming a RESTful Web Service with Spring for Android • Consuming XML from a RESTful Web Service with Spring for Android • Building Android Projects with Gradle • Building Android Projects with Maven • Installing the Android Development Environment 31

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Let’s look at some code! 32

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33 github.com/spring-projects/spring-data-rest github.com/spring-projects/spring-android github.com/SpringOne2GX-2014/spring-a-gram github.com/SpringOne2GX-2014/spring-a-gram-android Want to see more? Questions?