Abstract
In a collaborative session users may join and leave. A user who joins a session is called a latecomer. A latecomer needs the current state of the collaborative session to participate in the session. There exist different approaches to accommodate a latecomer. The runtime system can, e.g., transfer the state to the latecomer or replay how the session state was reached. If the state is maintained on a well-known server, it is quite simple to supply the latecomer with the current state. However, if the server is not available, the latecomer cannot join. To increase the fault-tolerance, the runtime system has to use a decentralized approach. In this case, race conditions must be taken into account. DreamObjects is a platform that simplifies the development of shared data objects. It supports a direct state transfer as well as a replay and lets a latecomer choose how to join a session. Both approaches are completely integrated in the runtime system, work completely decentralized, and do not block the other participants in their current work.
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Lukosch, S. (2003). Transparent Latecomer Support for Synchronous Groupware. In: Favela, J., Decouchant, D. (eds) Groupware: Design, Implementation, and Use. CRIWG 2003. Lecture Notes in Computer Science, vol 2806. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-39850-9_3
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