Nowadays people have to deal with an increasing amount of information contained in electronic documents available from numerous heterogeneous, widely distributed sources. Keeping up to date with recently published material relevant to a particular topic has become a challenge in itselJ The Yaka system aims at facilitating this task by providing notijication and delivery services. Yaka relies on a flexible definition of subjects through intelligent wrapping of existing information sources. Users can subscribe to these subjects in order to be notijied whenever new relevant documents are published. Yaka augments document not@-cation with document meta-information obtained through a set of integrated linguistic services. From the notification message users can directly request the document content. Yaka then delivers this content, automatically transformed into the appropriate format, through a variety of delivery media. In this article, we describe the Yaka ficnctionality, its architecture and how we deployed it within Xerox.
Abstract. Object migration is an often overlooked topic in distributed object-oriented platforms. Most common solutions provide data serialization and code mobility across several hosts. But existing mechanisms fall short in ensuring consistency when migrating objects, or agents, involved in coordinated interactions with each other, possibly governed by a multi-phase protocol. We propose an object migration scheme addressing this issue, implemented on top of the Coordination Language Facility (CLF). It exploits the particular combination of features in CLF: the resource-based programming paradigm and the communication protocol integrating a negotiation and a transaction phase. We illustrate through examples how our migration mechanism goes beyond classical solutions. It can be fine-tuned to consider different requirements and settings, and thus be adapted to a variety of situations.
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