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- W172974039 abstract "We describe problems associated with accessing data resources external to the application, which weterm externalities, in replicated synchronous collaborative applications (e.g., a multiuser text editor).Accessing externalities such as les, databases, network connections, environment variables and thesystem clock is not as straightforward in replicated collaborative software as in single-user applicationsand centralized collaborative systems. We describe ad hoc solutions that have been used previously. Ourprimary objection to the ad hoc solutions is that the developer must program di erent behavior into thedi erent replicas of a multi-user application, which increases the cost and complexity of development.We introduce a novel general approach to accessing externalities uniformly in a replicated collaborativesystem. The approach uses a semi-replicated architecture where the actual externality resides at a singlelocation and is accessed via replicated proxies. The proxies multiplex input to and output from the singleinstance of the externality. This approach facilitates the creation of replicated synchronous groupwarein two ways: (1) developers use the same mechanisms as in traditional single-user applications (2)developers program all replicas to execute the same behavior. We describe a general design for proxiedaccess to read{only, write{only and read{write externalities. We discuss the tradeo s of this semi-replicated approach over full, literal replication and the class of applications to which this approach canbe successfully applied. We also describe details of a prototype implementation of this approach withina replicated collaboration-transparency system, called Flexible JAMM (Java Applets Made Multi-user)." @default.
- W172974039 created "2016-06-24" @default.
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- W172974039 date "1999-09-01" @default.
- W172974039 modified "2023-09-26" @default.
- W172974039 title "System Resource Sharing for Synchronous Collaboration" @default.
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