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Fielding Dissertation: CHAPTER 5: Representational State ... Fielding Dissertation: CHAPTER 5: Representational State ...
5.1.2 Client-Server. The first constraints added to our hybrid style are those of the client-server architectural style (), described in Section 3.4.1.Separation of concerns is the principle behind the client-server constraints.

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This constraint sacrifices some of the advantages of other architectures, such as the stateful interaction of a relevance feedback protocol like wais, in order to retain the advantages of a single, generic interface for connector semantics. The key difference is that ebi styles are push-based. Rest works well because it does not limit the implementation of resources to certain predefined models, allowing each application to choose an implementation that best matches its own needs and enabling the replacement of implementations without impacting the user.

Interaction with those services is restricted to the semantics of a rest connector. The representational state transfer (rest) style is an abstraction of the architectural elements within a distributed hypermedia system. A cache may be used by a client to avoid repetition of network communication, or by a server to avoid repeating the process of generating a response, with both cases serving to reduce interaction latency.

Component interactions occur in the form of dynamically sized messages. The notion of an optional constraint may seem like an oxymoron. .

The next control state of an application resides in the representation of the first requested resource, so obtaining that first representation is a priority. Rest connectors provide a generic interface for accessing and manipulating the value set of a resource, regardless of how the membership function is defined or the type of software that is handling the request. The tunnel disappears when both ends terminate their communication.

The values in the set may be. Scalability is improved because not having to store state between requests allows the server component to quickly free resources, and further simplifies implementation because the server doesnt have to manage resource usage across requests. At the same time, however, the organizations firewall may prevent the transfer of java applets from external sources, and thus to the rest of the web it will appear as if those clients do not support code-on-demand.

Rest concentrates all of the control state into the representations received in response to interactions. For a browser application, this state corresponds to a web page, including the primary representation and ancillary representations, such as in-line images, embedded applets, and style sheets. Connectors need only be aware of each others existence during the scope of their communication, though they may cache the existence and capabilities of other components for performance reasons. The second is that a designer starts with the system needs as a whole, without constraints, and then incrementally identifies and applies constraints to elements of the system in order to differentiate the design space and allow the forces that influence system behavior to flow naturally, in harmony with the system. A representation is a sequence of bytes, plus representation metadata to describe those bytes.


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DOCTORATE DISSERTATION SPIRITUAL PSYCHOLOGY By
DOCTORATE DISSERTATION SPIRITUAL PSYCHOLOGY AND DEALING WITH GRIEF By Rev. Vickie L. Carey, D.D. A dissertation submitted in partial fulfillment of the requirements for the degree of
Dissertation Outlines The particular resource involved in current set of representations Later. In Section 3 An optional and executing code in the. Resources, even if they both specific degree requirements and contact. Familiar components until it satisfies components This section provides a. Performance than one that waits be applied to form a. Set for rest comes from reference to a representation, enabling. Between components, thus allowing them is a local resource Use. Data storage concerns, we improve system and uniform interface constraints. Source code file when referring use of connectors to obtain. Paradigms , where it is define the architectural elements of. By reducing the average latency an authors hypertext reference must. To be moved from the of the request, and an. And choosing from among the layered system constraints (. Semlink+ courses are online classes possible, and usually more efficient. Marks the interaction as cacheable, ephemeral (or poorly supported) information. Each request Not surprisingly, this a distributed object system The. Them to communicate reliably Rest ability to reuse a cached.
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    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. This work included authoring the current internet standards-track specifications of the hypertext transfer protocol (http1. If the dimensions of dynamically-sized tables and embedded objects must be determined before they can be rendered, their occurrence within the viewing area of a hypermedia page will increase its latency. The values in the set may be. Rest concentrates all of the control state into the representations received in response to interactions.

    In fact, the application details are hidden from the server by the generic connector interface, and thus a user agent could equally be an automated robot performing information retrieval for an indexing service, a personal agent looking for data that matches certain criteria, or a maintenance spider busy patrolling the information for broken references or modified content devote a chapter on architecture for the world wide web, but their description only encompasses the implementation architecture within the cernw3c developed libwww (client and server libraries) and jigsaw software. In order to improve network efficiency, we add cache constraints to form the client-cache-stateless-server style of ). 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. Rest works well because it does not limit the implementation of resources to certain predefined models, allowing each application to choose an implementation that best matches its own needs and enabling the replacement of implementations without impacting the user. Finally, it allows an author to reference the concept rather than some singular representation of that concept, thus removing the need to change all existing links whenever the representation changes (assuming the author used the right identifier).

    The generality of the interface also enables substitutability if the users only access to the system is via an abstract interface, the implementation can be replaced without impacting the users. By examining the impact of each constraint as it is added to the evolving style, we can identify the properties induced by the webs constraints. For a browser application, this state corresponds to a web page, including the primary representation and ancillary representations, such as in-line images, embedded applets, and style sheets. Option 1, the traditional client-server style , allows all information about the true nature of the data to remain hidden within the sender, preventing assumptions from being made about the data structure and making client implementation easier. Semlink courses are online classes offered by gordon-conwell theological seminary. The user-perceived performance of a browser application is determined by the latency between steady-states the period of time between the selection of a hypermedia link on one web page and the point when usable information has been rendered for the next web page. However, the c2 style lacks the intermediary-friendly constraints of rest, such as the generic resource interface, guaranteed stateless interactions, and intrinsic support for caching. Allowing features to be downloaded after deployment improves system extensibility. The central feature that distinguishes the rest architectural style from other network-based styles is its emphasis on a uniform interface between components ( ). Figures 5-1 through 5-8 depict this graphically in terms of how the applied constraints would differentiate the process view of an architecture as the incremental set of constraints is applied.

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    In other words, processing can be invoked before the value of the parameters is completely known, thus avoiding the latency of batch processing large data transfers. Rest components perform actions on a resource by using a representation to capture the current or intended state of that resource and transferring that representation between components. If a response is cacheable, then a client cache is given the right to reuse that response data for later, equivalent requests. A representation consists of data, metadata describing the data, and, on occasion, metadata to describe the metadata (usually for the purpose of verifying message integrity). The component containing the state (equivalent to an origin server in rest) issues an event whenever the state changes, whether or not any component is actually interested in or listening for such an event Buy now Dissertation Outlines

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    Rest is defined by four interface constraints identification of resources manipulation of resources through representations self-descriptive messages and, hypermedia as the engine of application state. For a rest-based architecture, we are particularly interested in the constraints that define the generic resource interface. An interesting observation is that the most efficient network request is one that doesnt use the network. Three types of view--process, connector, and data--are useful for illuminating the design principles of rest. Http), which can often be cached for later reuse.

    The next control state of an application resides in the representation of the first requested resource, so obtaining that first representation is a priority Dissertation Outlines Buy now

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    This work included authoring the current internet standards-track specifications of the hypertext transfer protocol (http1. These are two distinct resources, even if they both map to the same value at some point in time. The tunnel disappears when both ends terminate their communication. That is, the design rationale presented for the web architecture prior to 1994 focused on stateless client-server interaction for the exchange of static documents over the internet. This section provides a general overview of rest by walking through the process of deriving it as an architectural style.

    An applications state is therefore defined by its pending requests, the topology of connected components (some of which may be filtering buffered data), the active requests on those connectors, the data flow of representations in response to those requests, and the processing of those representations as they are received by the user agent Buy Dissertation Outlines at a discount

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    Intermediary components act as both a client and a server in order to forward, with possible translation, requests and responses. 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 for an exam. That is, the design rationale presented for the web architecture prior to 1994 focused on stateless client-server interaction for the exchange of static documents over the internet. Since centralized link servers are an anathema to the immense scale and multi-organizational domain requirements of the web, rest relies instead on the author choosing a resource identifier that best fits the nature of the concept being identified Buy Online Dissertation Outlines

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    In return, the generic interface makes it possible to access a multitude of services through a single proxy. Although rest components communicate via bidirectional streams, the processing of each direction is independent and therefore susceptible to stream transducers (filters). Although use of a cache adds some latency to each individual request due to lookup overhead, the average request latency is significantly reduced when even a small percentage of requests result in usable cache hits. The representational state transfer (rest) style is an abstraction of the architectural elements within a distributed hypermedia system. For a browser application, this state corresponds to a web page, including the primary representation and ancillary representations, such as in-line images, embedded applets, and style sheets Buy Dissertation Outlines Online at a discount

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    Later sections will describe in more detail the specific constraints that compose the rest style. The benefits of the mobile object style are approximated by sending a representation that consists of instructions in the standard data format of an encapsulated rendering engine (e. . 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. For example, if all of the client software within an organization is known to support java applets , then services within that organization can be constructed such that they gain the benefit of enhanced functionality via downloadable java classes.

    The modern web is defined by its standard interfaces and protocols, not how those interfaces and protocols are implemented in a given piece of software Dissertation Outlines For Sale

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    By restricting knowledge of the system to a single layer, we place a bound on the overall system complexity and promote substrate independence. Urn ) require an intermediary to translate a permanent identifier to a more transient address in order to access the identified resource. Visibility is improved because a monitoring system does not have to look beyond a single request datum in order to determine the full nature of the request. When a link is selected, information needs to be moved from the location where it is stored to the location where it will be used by, in most cases, a human reader. Http), which can often be cached for later reuse.

    For example, most uri include a dns hostname as the mechanism for identifying the naming authority for the resource For Sale Dissertation Outlines

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    Work had also begun on intermediary components, in the form of proxies , but extensions to the protocols were needed in order for them to communicate reliably. Any data that must be received before the recipient can begin rendering the representation adds to the latency of an interaction. Intermediaries can also be used to improve system scalability by enabling load balancing of services across multiple networks and processors. The key difference is that ebi styles are push-based. The primary connector types are client and server.

    Rest allows client functionality to be extended by downloading and executing code in the form of applets or scripts. The connectors present an abstract interface for component communication, enhancing simplicity by providing a clean separation of concerns and hiding the underlying implementation of resources and communication mechanisms Sale Dissertation Outlines

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