移動型オブジェクト上の演算型に基づく楽観的ロック

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Kinds of mobile stations like PDA are available at present. Objects are distributed in not only fixed but also mobile stations. Transactions manipulate multiple objects including mobile objects. While the objects are moving from one location to others, the quality of service (QoS) supported by the objects are changed. The connection is closed by the mobile wireless startion in order to reduce the power consumption while the operations issued by the mobile station are being computed, i. e. disconnected operations. One technique to compute the disconnected operations is to cache data in the fixed station like server to the mobile station. Without communicating with the fixed station, users can manipulate the data cached into the mobile station. [4] discusses the locking scheme based on the optimistic two-phase locking [2] on the replicas and a way to reduce the communication. In this paper, the distributed system is assumed to be composed of objects distributed in multiple stations. Each object supports abstract data and operations for manipulating the data, while only read and write operationa are considered in the other papers [1, 3, 4]. Problem is how to support users with the service required by the users under situations where the objects are moving in the system. In this paper, we would like to discuss how to manage transactions which manipulate mobile and replicated objects, which support nested, abstract operations. In section 2, we present the system model. In section 3, we discuss how to maintain the mutual consistency among the replicas. In section 4, we present the evaluation.
一般社団法人情報処理学会の論文
1996-03-06

移動型オブジェクト上の演算型に基づく楽観的ロック

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