oodOPT:A Semantics-Based Concurrency Control Framework for Fully-Replicated Architecture

Concurrency control has always been one of the mostimportant issues in the design of synchronous groupware systems withfully-replicated architecture. An ideal strategy should be able tosupport natural and flexible human-to-computer and human-to-humaninteractions while maintaining the consistency of the system. Thispaper summarizes previous researches on this topic and points out thedeficiencies of the existing results. A novel semantics-based concurrencycontrol framework, oodOPT, is proposed. The main idea ofthe framework is to resolve conflicts by utilizing semantics of theoperations and the accessed data objects. With this approach,complexities in concurrency control are shifted completely fromapplication developers to the framework. Conflicts among operations onobjects with different semantics and the strategies resolving theseconflicts are analyzed. After describing the algorithm in full detail,the discussion ends up with a comparison with other related work and someconsiderations for open problems.