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Creating 3rd GenerationWeb APIs with HydraMarkus LanthalerGraz University ofTechnology

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Level 0:The Swamp of POXLevel 1: ResourcesLevel 2: HTTPVerbsLevel 3: Hypermedia Controls

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Using Web APIs is still challenging

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- Layered system

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Result: tightly coupled & brittle systems

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REST + Linked Data: a match made!?

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Semaphobia!?

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ResourceLinkFormClassOperationHydra

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{"id": "cso29ax","title": "WWW2013","description": "Presentation for dev track","is_open": true,"created_at": "2012-11-26T04:49:44Z"}http://example.com/issues/cso29axhttp://example.com/issue/{id}/comments/

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{"id": "cso29ax","title": "WWW2013","description": "Presentation for dev track","is_open": true,"created_at": "2012-11-26T04:49:44Z","comments": "/issues/cso29ax/comments/"}http://example.com/issues/cso29ax

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{"@context": "/ctx/context.jsonld","id": "cso29ax","title": "WWW2013","description": "Presentation for dev track","is_open": true,"created_at": "2012-11-26T04:49:44Z","comments": "/issues/cso29ax/comments/"}http://example.com/issues/cso29ax

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{"@context": {..."is_open": "http://example.com/vocab#isOpen","comments": {"@id": "http://example.com/vocab#comments","@type": "@id"}}}http://example.com/ctx/context.jsonld

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{"@context": "/ctx/context.jsonld","id": "cso29ax","title": "WWW2013","description": "Presentation for dev track","is_open": true,"created_at": "2012-11-26T04:49:44Z","comments": "/issues/cso29ax/comments/"}http://example.com/issues/cso29ax{"@id": "#comments","@type": "hydra:Link",...}

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{"@id": "#comments","@type": "hydra:Link","supportedOperations": [{"@id": "#create-comment","@type": "hydra:CreateResourceOperation","label": "Creates a new comment","method": "POST","expects": "#Comment","returns": "#Comment"}]}

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{"@id": "#Comment","@type": "hydra:Class","supportedProperties": [{"property": "#text","required": true,"readonly": false,"writeonly": false}]}

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Hydra Console

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© 2013, Markus Lanthaler. Some Rights Reserved.http://creativecommons.org/licenses/by-nc-sa/3.0/Thank You

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Questions?Markus Lanthalerhttp://www.markus-lanthaler.com@MarkusLanthalermail@markus-lanthaler.com

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Image Credits(1) http://www.flickr.com/photos/joeshlabotnik/3707230247/(2) http://onlyhdwallpapers.com/high-definition-wallpaper/903850/(4) http://www.flickr.com/photos/kaptainkobold/3203311346/(6) http://www.flickr.com/photos/joyoflife/1570126182/(8) http://en.wikipedia.org/wiki/The_Scream(9) http://www.vonwong.com/ (with permission)