Roy fielding dissertation
Web protocols could then be used to retrieve that document. Information hiding is one of the key software engineering principles that motivates the uniform interface of REST. Because a client is restricted to the manipulation of representations rather than directly accessing the implementation of a resource, the implementation can be constructed in whatever form is desired by the naming authority without impacting the clients that may use its representations.
The key problem areas in HTTP that were identified by REST included planning for the deployment of new protocol versions, separating message parsing from HTTP semantics and the underlying transport layer TCP , distinguishing between authoritative and non-authoritative responses, fine-grained control of caching, and various aspects of the protocol that failed to be self-descriptive. HTTP does not support write-back caching. An HTTP cache cannot assume that what gets written through it is the same as what would be retrievable from a subsequent request for that resource, and thus it cannot cache a PUT request body and reuse it for a later GET response.
There are two reasons for this rule: 1 metadata might be generated behind-the-scenes, and 2 access control on later GET requests cannot be determined from the PUT request. However, since write actions using the Web are extremely rare, the lack of write-back caching does not have a significant impact on performance. Fielding also lays some disadvantages of HTTP cookie usage and frames i. Also notes its success as an open source project. A network-based API is an on-the-wire syntax, with defined semantics, for application interactions.
On the plus side, performance is only bounded by the protocol design and not by any particular implementation of that design. API Workshop - Rest Dissertation Sections: Bread Crumb Navigation Roy Fielding Abstract Quotes "Roy Fielding": My work is motivated by the desire to understand and evaluate the architectural design of network-based application software through principled use of architectural constraints, thereby obtaining the functional, performance, and social properties desired of an architecture. Summary of Dissertation via Roy Fielding In summary, this dissertation makes the following contributions to software research within the field of Information and Computer Science: a framework for understanding software architecture through architectural styles, including a consistent set of terminology for describing software architecture a classification of architectural styles for network-based application software by the architectural properties they would induce when applied to the architecture for a distributed hypermedia system REST, a novel architectural style for distributed hypermedia systems application and evaluation of the REST architectural style in the design and deployment of the architecture for the modern World Wide Web.
Chapter 1 - Software Architecture "Roy Fielding": A software architecture is an abstraction of the run-time elements of a software system during some phase of its operation. This chapter provides terminology that set the stage for later chapters. Fielding explains network latency concepts and how the style of a network application architecture influences the performance of such architectures There is great discussions on the following topics: Scalability Simplicity Modifiability Visibility Portability Reliability The overall premise of this chapter seems to point that architectural style influences architectural design CHAPTER 3 - Network-based Architectural Styles This chapter discusses many different types of architectural styles in network-based architectures.
Pipe and Filter styles is mentioned quite often in this chapter.
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The most well known pipe and filter system is a Unix Program or in compilers. Fielding formulates 3 hypothesis: The design rationale behind the WWW architecture can be described by an architectural style consisting of the set of constraints applied to the elements within the Web architecture.
Separation of concerns is the principlebehind the client-server constraints. By separating the user interface concerns from the data storage concerns, we improve the portability of the user interface across multiple platforms and improve scalability by simplifying the server components. Stateless Communication must be stateless in nature, as in the client-stateless-server CSS style, such that each request from client to server must contain all of the information necessary to understand the request, and cannot take advantage of any stored context on the server.
Session state is therefore kept entirely on the client.
Cache In order to improve network efficiency, we add cache constraints to form the client-cache-stateless-server style. Cache constraints require that the data within a response to a request be implicitly or explicitly labeled as cacheable or non-cacheable.
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Consider application state to be data that could vary by client, and per request. Resource state, on the other hand, is constant across every client who requests it. Ever had back-button issues with a web application where it went AWOL at a certain point because it expected you to do things in a certain order?
That's because it violated the statelessness principle. There are cases that don't honor the statelessness principle, such as three-legged OAuth, API call rate limiting, etc. However, make every effort to ensure that application state doesn't span multiple requests of your service s. As on the World Wide Web, clients can cache responses. Responses must therefore, implicitly or explicitly, define themselves as cacheable, or not, to prevent clients reusing stale or inappropriate data in response to further requests.
Well-managed caching partially or completely eliminates some client—server interactions, further improving scalability and performance. The uniform interface separates clients from servers. This separation of concerns means that, for example, clients are not concerned with data storage, which remains internal to each server, so that the portability of client code is improved.
Servers are not concerned with the user interface or user state, so that servers can be simpler and more scalable. Servers and clients may also be replaced and developed independently, as long as the interface is not altered. A client cannot ordinarily tell whether it is connected directly to the end server, or to an intermediary along the way.
Intermediary servers may improve system scalability by enabling load-balancing and by providing shared caches. Layers may also enforce security policies. Lists with This Book. This book is not yet featured on Listopia.
Roy Fielding - Wikipedia
Community Reviews. Showing Average rating 4. Rating details. Sort order. May 27, Max rated it really liked it Shelves: classic , programming. I wouldn't exactly call this an enjoyable read, but it was certainly worthwhile.
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Given that I work in the web industry, I'm surprised that it took me so long to get around to reading it. The academic jargon was pretty frustrating; it made the concepts slightly more confusing to understand. That's why I'm giving the paper four stars instead of five. View 2 comments. Feb 05, Doug Orleans rated it it was ok. It wasn't really what I expected; it's largely about semi-formally defining the concept of a software "architectural style", with REST as the main example defined in Chapter 5.
The definition of REST is rather abstract and nebulous; the definitions of "resource" and "representation" are good and useful, but I was expecting to see more about "hypermedia as the engine of application state" HATEOAS -- there's really just one vague paragraph about it here.
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He goes into more detail in a blog post , with some concrete examples and discussion in the comments. Oct 27, Cameron rated it really liked it. Fielding's famous doctoral dissertation defining the architectural principles of representational state transfer or REST. Essentially, Fielding offers a set of constraints for implementing web standards like HTTP and URI to achieve generality of interfaces, minimal interaction latency and maximum scalability and independence of deployed components. Although the first several chapters are academic contrasts of various architectural styles, the brilliance of REST architecture becomes readily appar Fielding's famous doctoral dissertation defining the architectural principles of representational state transfer or REST.