Kim Dalsgaard. Co-owner of, and Software Designer at Trifork Athene Co-founder of Aarhus Ruby Brigade
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1 Kim Dalsgaard Co-owner of, and Software Designer at Trifork Athene Co-founder of Aarhus Ruby Brigade
2 REST in Ruby How Ruby can support a RESTful architecture
3 What is REST?
4 REST is first described in Roy Fielding s PhD dissertation
5 Architectural Styles and the Design of Network-based Software Architectures
6 REST is one of these architectural styles
7 What is an architectural style?
8 An architectural style is about constraints
9 What is the constraints for REST?
10 Key constraints Identifiable resources Uniform interface Stateless communication Resource representations Hypermedia
11 Identifiable resources A resource represents a real or virtual entity Identified by URIs Each URI adds value to the Net as a whole
12 Uniform interface GET POST PUT DELETE and some more
13 Stateless communication A server does not need to maintain state for each client Massive advantages in terms of scalability Enforces loose coupling (no shared session knowledge)
14 Resource representations Resources are always accessed through a representation Resources should be represented using well-known (standardized) content types HTTP provides content types and content negotiation
15 Hypermedia Possible state transitions are made explicit through links Links are always provided by the server, not created by the client (low coupling again)
16 REST Servers
17 How can the Ruby web frameworks help us with the REST constraints?
18 Identifiable resources - mapping of URLs to controllers and parameters
19 Uniform interface - mapping of HTTP verbs to actions
20 Stateless communication - switching off the session store
21 Resource representations - executing code according to content type
22 Hypermedia - creating URLs from objects
23 REST and Rails
24 The resource and resources methods for routing
25
26
27
28
29 The respond_to method for executing code according to content type
30
31 The magic _url methods for creating URL s from objects
32
33 The session method for turning off sessions
34
35 REST and Merb
36 The resource and resources methods for routing
37
38
39
40 The provides and display methods for rendering objects
41 The provides method for registering mimetypes to render
42 The display method for rendering objects
43
44 The url methods for creating URLs from objects
45
46 The :session_store configuration key for turning off sessions
47
48 REST Clients
49 How can the Ruby HTTP client libraries help us with the REST constraints?
50 Identifiable resources - holding resource identity
51 Uniform interface - mapping of HTTP verbs to method calls
52 Stateless communication - a server responsibility
53 Resource representations - setting the Accept header
54 Hypermedia - fetching and following URLs
55 REST and Net::HTTP
56
57 Too low level!
58 REST and rest-open-uri
59
60 URI objects holding resource identity HTTP verbs mapped to key/value pair in options Hash Low level access the Accept header No fetching and following URLs
61 REST and RestClient
62
63 Resource objects holding resource identity HTTP verbs mapped to methods Easy to set the Accept header No fetching and following URLs Buggy post method!
64 REST and ActiveResource
65
66 Base objects holding resource identity HTTP verbs mapped to alternative methods Fetching and following URLs Possible to change the serialization format
67 Links are not provided by the server, but created by the client! Too much additional protocol
68 Questions?
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