Accommodating latecomers in shared window systems

Chung, Goopeel; Jeffay, Kevin; Abdel-Wahab, H.

doi:10.1109/2.179162

Cited by 21 publications

(11 citation statements)

References 3 publications

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“…A variety of techniques, collectively referred to as process migration, can be used to copy an active process from one execution environment to another. Two common process migration schemes are event replay, where the system logs all state-changing events during process execution and replays them to a new instance of the process, and image-copy, where an image of the process in memory is copied [Chung and Dewan 1996] (see also Begole et al [1997b] Flexible Collaboration Transparency • and Chung et al [1993] for more details on process migration for groupware). Event replay has two disadvantages: (1) the migration time depends on the length of the execution and (2) potentially expensive operations are executed multiple times.…”

Section: Platform Requirementsmentioning

confidence: 99%

Flexible collaboration transparency

Begole

Rosson

Shaffer

1999

ACM Trans. Comput.-Hum. Interact.

141

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This article presents a critique of conventional collaboration transparency systems, also called "application-sharing" systems, which provide the real-time shared use of legacy single-user applications. We find that conventional collaboration transparency systems are inefficient in their use of network resources and lack support for key groupware principles: concurrent work, relaxed WYSIWIS, and group awareness. Next, we present an alternative approach to implementing collaboration transparency that provides many features previously seen only in collaboration-aware applications. Our approach is based on a replicated architecture where selected single-user interface components are dynamically replaced by multiuser versions. The replacement occurs at run-time and is transparent to the single-user application and its developers. As an instance of this approach, we describe its incorporation into a Java-based collaboration transparency system for serializable, Swing-based Java applications, called Flexible JAMM (Java Applets Made Multiuser). To validate that the flexible collaboration transparency system is truly an improvement over conventional systems, we conducted an empirical study of collaborators performing both tightly and loosely coupled tasks using Flexible JAMM versus a representative conventional collaboration transparency system, Microsoft NetMeeting. Completion times were significantly faster in the loosely coupled task using Flexible JAMM and were not adversely affected in the tightly coupled task. Accuracy was equivalent for both systems. Participants greatly preferred Flexible JAMM.

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Section: Platform Requirementsmentioning

confidence: 99%

Flexible collaboration transparency

Begole

Rosson

Shaffer

1999

ACM Trans. Comput.-Hum. Interact.

141

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“…Two competing solutions are replaying all previous events to the newcomer vs. transmitting a current image of application state. Because the history of previous events can become arbitrarily large despite potential for compression [10], recent work favors the image copy approach [42]. This is partly due to novel architectures that make it easy to marshal complex runtime structures [3], and is also the foundation for our application migration facility.…”

Section: Related Workmentioning

confidence: 99%

Distributed Applications for Collaborative Three-Dimensional Workspaces

Schmalstieg

Reitmayr

Hesina

2003

Presence: Teleoperators & Virtual Environments

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“…For example, XTV uses logging for replicating both the user-interface component [8] and the program component [5]. Examples of log-based distributed systems include Coda [9] and Cygnus [10].…”

Section: Related Workmentioning

confidence: 99%

Towards dynamic collaboration architectures

Chung

Dewan

2004

Proceedings of the 2004 ACM Conference on Computer Supported Cooperative Work

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In this paper, we introduce the concept of dynamically changing between centralized, replicated, and hybrid collaboration architectures. It is implemented by providing users a function that dynamically changes the mapping between user-interface and program components. We decompose the function into more primitive commands that are executed autonomously by individual users. These commands require a mechanism to dynamically replicate user-interface and program components on a user's site. We present a logging approach for implementing the mechanism that records input (output) messages sent to one incarnation of a program (user-interface) component, and replays the recorded messages to a different incarnation of the component. Preliminary experiments with an implementation of the mechanism show that response and completion times can improve by dynamically changing the architecture to adapt to changes to the set of users in a collaboration session involving a mix of mobile and stationary devices.

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Accommodating latecomers in shared window systems

Cited by 21 publications

References 3 publications

Flexible collaboration transparency

Flexible collaboration transparency

Distributed Applications for Collaborative Three-Dimensional Workspaces

Towards dynamic collaboration architectures

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