July 2001
Intermediate to advanced
656 pages
15h 51m
English
book
Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition
by Craig Larman
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33.3. Failover to Local Services with a Proxy (GoF)
Failover to a local service for the product information was achieved by inserting the local service in front of the external service; the local service is always tried first. However, this design is not appropriate for all services; sometimes the external service should be tried first, and a local version second. For example, consider the posting of sales to the accounting service. Business wants them posted as soon as possible, for real-time tracking of store and register activity.
In this case, another GoF pattern can solve the problem: Proxy. Proxy is a simple pattern, and widely used in its Remote Proxy variant. For example, in Java's RMI and in CORBA, a local client-side object (called ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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