An optional constraint allows us to design an architecture that supports the desired behavior in the general case, but with the understanding that it may be disabled within some contexts. The stateless nature of rest allows each interaction to be independent of the others, removing the need for an awareness of the overall component topology, an impossible task for an Internet-scale architecture, and allowing components to act as either destinations or intermediaries, determined dynamically. ID-WSF may fill this void.
Service-oriented Architecture (SOA) should expose. 1.4.1 Agents and Services. A Web service is an abstract notion that must be implemented by a concrete agent. (See Figure 1-1) The agent is the concrete piece of software or hardware that sends and receives messages, while the service is the resource characterized by the abstract set of functionality that is provided. The first constraints added to our hybrid style are those of the client-server architectural style described in Section paration of concerns is the principle behind the client-server constraints.
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When one participant sends a message to the other one, it does not rely on an immediate answer message to continue processing (neither logically, nor physically). Rest provides a set of architectural constraints that, when applied as a whole, emphasizes scalability of component interactions, generality of interfaces, independent deployment of components, and intermediary components to reduce interaction latency, enforce security, and encapsulate legacy systems. Although rest interaction is two-way, the large-grain data flows of hypermedia interaction can each be processed like a data-flow network, with filter components selectively applied to the data stream in order to transform the content as it passes. Their phase 2 work is grouped into three categories: ID-FF, ID-WSF, and ID-SIS. The more exact the version match has to be, the less loosely coupled the participants (in this dimension). Response messages may include both representation metadata and resource metadata: information about the resource that is not specific to the supplied representation. Consider the following message: 47113 and compare it to: 4711 3, while it is obvious that the second alternative is human-readable while the first one is not, it is also notable that in the second case, a participant that accesses the information via a technology.
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