Exploiting virtual synchrony in distributed systems
SOSP '87 Proceedings of the eleventh ACM Symposium on Operating systems principles
Concurrency control in groupware systems
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
Replicated architectures for shared window systems: a critique
COCS '90 Proceedings of the ACM SIGOIS and IEEE CS TC-OA conference on Office information systems
“Lazy” consistency: a basis for cooperative software development
CSCW '92 Proceedings of the 1992 ACM conference on Computer-supported cooperative work
Undoing actions in collaborative work
CSCW '92 Proceedings of the 1992 ACM conference on Computer-supported cooperative work
A Case Study of CES: A Distributed Collaborative Editing System Implemented in Argus
IEEE Transactions on Software Engineering - Special issue: specification and analysis of real-time systems
Protocols for integrated audio and shared windows in collaborative systems
MULTIMEDIA '94 Proceedings of the second ACM international conference on Multimedia
A distributed and policy-free general-purpose shared window system
IEEE/ACM Transactions on Networking (TON)
Concurrency Control and View Notification Algorithms for Collaborative Replicated Objects
IEEE Transactions on Computers
Consistency maintenance in real-time collaborative graphics editing systems
ACM Transactions on Computer-Human Interaction (TOCHI)
Atomic data abstractions in a distributed collaborative editing system
POPL '86 Proceedings of the 13th ACM SIGACT-SIGPLAN symposium on Principles of programming languages
Consistency models for distributed interactive multimedia applications
ACM SIGOPS Operating Systems Review
Transactions: a construct for reliable distributed computing
ACM SIGOPS Operating Systems Review
| Hi-index | 0.00 |
The multimedia information exchanges in dis- tributed collaborative applications may be modeled, from communication system perspective, as the flow of media messages between user entities, to provide access to shared window objects on workstations. An example of shared window is a design document inter- actively reviewed by a team of engineers over a dis- cussion session. A key requirement is that all users should see the same local copy of a shared window object at any given point in time (WYSIWIS), even though these users may reside in different workstations interconnected over a network. In this paper, we study the temporal ordering of real-time persistent messages as the basis for achieving WYSIWIS. The approach requires specifying the synchronization constraints on accessing shared window objects in the form of state- transition relations and timeliness needs when process- ing messages for object state updates. Non-conflicting actions can be processed in any sequence by user en- tities, thereby increasing overall system-level perfor- mance and user-level efficacy. The paper describes the salient features of our concurrency control model, and then identifies the basic protocol elements to re- alize the model. Applications are also described to demonstrate the viability of our approach.