Guilherme Cavalcanti rated it liked it Feb 19, The key difference is that EBI styles are push-based. Refresh and try again. A similar example from software engineering is the separate identification of a version-controlled source code file when referring to the “latest revision”, “revision number 1. Developers of Web implementations had already exceeded the early design.

The most common example is a Web browser, which provides access to information services and renders service responses according to the application needs. REST attempts to balance the desire for transparency in cache behavior with the desire for efficient use of the network, rather than assuming that absolute transparency is always required. The rationale for this design can be seen in the nature of distributed hypermedia. There are two common perspectives on the process of architectural design, whether it be for buildings or for software. Disertasi dari pak Roy Fielding untuk referensi tugas akhir. That is, the design rationale presented for the Web architecture prior to focused on stateless client-server interaction for the exchange of static documents over the Internet.

The final form of connector type is a tunnel, which simply relays communication across a connection boundary, such as a firewall or lower-level network gateway.

An interesting observation is that the most efficient network request is one that doesn’t use the network. Vladimir Rybas rated it it was amazing Feb 17, For example, if all of the client software within an roy thomas fielding dissertation pdf is known to support Java applets [ 45 ], then services within that organization can be constructed such that they gain the benefit of enhanced functionality via downloadable Java classes.

Option 2, the mobile object style [ 50 ], provides information hiding while enabling specialized processing of the data via its unique rendering engine, but limits the functionality of the recipient to what is anticipated within that engine and may vastly increase the amount of data transferred.

Finally, it allows an author to reference the concept rather than some singular representation of that concept, thus removing the roy thomas fielding dissertation pdf to change all existing links whenever the representation changes assuming the author used the right identifier.

If the value set of a resource at a given time consists of multiple roy thomas fielding dissertation pdf, content negotiation may be used to select the best representation for inclusion in a given message.

The connector interface is similar to procedural invocation, but with important differences in the passing of parameters and results. Services may be implemented using a complex hierarchy of intermediaries and multiple distributed origin servers.

Architectural Styles and the Design of Network-based Software Architectures by Roy Thomas Fielding

Not surprisingly, this exactly matches the user interface of a hypermedia browser. Three types of view–process, connector, and data–are useful for illuminating the design principles of REST. A third connector type, the cache connector, can be located on the interface to a client or server connector in order to save cacheable responses to current interactions so that they can be reused for later requested interactions. The ability to incrementally roy thomas fielding dissertation pdf the response data as it is received is determined by the design of the media type and the availability of layout information visual dimensions of in-line objects roy thomas fielding dissertation pdf each representation.

A component may include both client and server connectors. This simplifies clients by reducing the number of features required to be pre-implemented. Although the first several chapters are academic contrasts of various architectural styles, the brilliance of REST architecture becomes readily apparent.

David Shepherd rated it really liked it Dec 20, The software architecture framework of Chapter 1 is used to define the architectural elements of REST and examine sample process, connector, and data views of prototypical architectures. A cache is typically implemented within the address space of the connector that uses roy thomas fielding dissertation pdf. Chapter two defines the set of architectural properties used for evaluation of architectural styles.

I described the software engineering principles guiding REST and the interaction constraints chosen to retain those principles, while contrasting them to the constraints of other architectural styles. A cache may be used by a client to avoid repetition of network communication, or by a server to avoid repeating the roy thomas fielding dissertation pdf of generating a response, with both cases serving to reduce interaction latency.

Depending on the message control data, a given representation may indicate the current state of the requested resource, the desired state for the requested resource, or the value of some other resource, such as a representation of the input data within a client’s query form, or a representation of some error condition for a response.

Note that the difference between a proxy and a gateway is that a client determines when it will use a proxy. The tunnel disappears when both ends terminate their communication.

Amazing, considering it was written almost 20 years ago. For example, looking-up a word in an on-line dictionary is one application, as is touring through a virtual museum, or reviewing a set of class notes to study roy thomas fielding dissertation pdf an exam. The author starts from a “null” architecture and derives the REST architectural “style” by gradually adding design constraints.

Mostafa Elsayh rated it it was amazing Jul 15, Although this is less efficient when viewed as roy thomas fielding dissertation pdf single client wishing to monitor a single resource, the scale of the Web makes an unregulated push model infeasible. The academic jargon was pretty frustrating; it made the concepts slightly more confusing to understand.

A user agent uses a client connector to initiate a request and becomes the ultimate recipient of the response. However, the style does not assume that all applications are browsers. Lists with This Book. About Roy Thomas Fielding.

Although REST components communicate via bidirectional streams, the processing of each direction is independent and therefore susceptible to stream transducers filters. I wouldn’t exactly call this an enjoyable read, but it was certainly worthwhile. Developers of Web implementations had already exceeded the early design.

Juliana rated it it was ok Mar 03, By separating the user interface concerns from the data storage concerns, we improve the portability of the roy thomas fielding dissertation pdf interface roy thomas fielding dissertation pdf multiple platforms and improve scalability by simplifying the server components. The naming authority that assigned the resource identifier, making it possible to reference the resource, is responsible for maintaining the semantic validity of the mapping over time i.

First, it provides generality by encompassing many sources of information without artificially distinguishing them by type or implementation. Chapter 5 in particular is the blueprint for RESTful web services.

Architectural Styles and the Design of Network-based Software Architectures

However, shared caching can also lead to errors if the cached roy thomas fielding dissertation pdf does not match what would have been obtained by a new request. Work had also begun on intermediary components, in the form of proxies [ 79 ] and shared caches [ 59 ], but extensions to the protocols were needed in order for them to communicate reliably.

An optional constraint allows us to roy thomas fielding dissertation pdf an architecture that supports the desired behavior in the general case, but with the understanding that it may be disabled within some contexts. The first constraints added to our hybrid style are those of the client-server architectural style Figuredescribed in Section 3.