- Request-response
Request-response, also known as request-reply, is a message exchange pattern in which a requestor sends a request message to a replier system which receives and processes the request, ultimately returning a message in response. This is a simple, but powerful messaging pattern which allows two applications to have a two-way conversation with one another over a channel. This pattern is especially common in client-server architectures. [Hohpe, Gregor. "Enterprise Integration Patterns: Designing, Building, and Deploying Messaging Solutions". ISBN 0321200683. p. 184]
For simplicity's sake, this pattern is typically implemented in a purely synchronous fashion, as in
web service calls overHTTP , which holds a connection open and waits until the response is delivered or the timeout period expires. However, request-response may also be implemented asynchronously, with a response being returned at some unknown later time. This is often referred to as "sync over async", or "sync/async", and is common in EAI implemetations where slowaggregation s, time-intensive functions, or human workflow must be performed before a response can be constructed and delivered.ee also
*
Message Exchange Pattern External links
* [http://www.serviceoriented.org/request-response.html Request-Response] on [http://www.serviceoriented.org/ ServiceOriented.org]
References
Wikimedia Foundation. 2010.
См. также в других словарях:
request — [ri kwest′] n. [ME < OFr requeste < ML requesta < fem. pp. of VL * requaerere: see REQUIRE] 1. the act of asking, or expressing a desire, for something; solicitation or petition 2. something asked for [to grant a request] 3. the state of … English World dictionary
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