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首页> 外文期刊>IEEE Transactions on Knowledge and Data Engineering >Continual queries for Internet scale event-driven information delivery
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Continual queries for Internet scale event-driven information delivery

机译：持续查询Internet规模的事件驱动的信息传递

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We introduce the concept of continual queries, describe the design of a distributed event-driven continual query system-OpenCQ, and outline the initial implementation of OpenCQ on top of the distributed interoperable information mediation system DIOM. Continual queries are standing queries that monitor update of interest and return results whenever the update reaches specified thresholds. In OpenCQ, users may specify to the system the information they would like to monitor (such as the events or the update thresholds they are interested in). Whenever the information of interest becomes available, the system immediately delivers it to the relevant users; otherwise, the system continually monitors the arrival of the desired information and pushes it to the relevant users as it meets the specified update thresholds. In contrast to conventional pull-based data management systems such as DBMSs and Web search engines, OpenCQ exhibits two important features: it provides push-enabled, event-driven, content-sensitive information delivery capabilities; and it combines pull and push services in a unified framework. By event-driven we mean that the update events of interest to be monitored are specified by users or applications. By content-sensitive, we mean the evaluation of the trigger condition happens only when a potentially interesting change occurs. By push-enabled, we mean the active delivery of query results or triggering of actions without user intervention.
机译：我们介绍了连续查询的概念，描述了分布式事件驱动的连续查询系统OpenCQ的设计，并在分布式可互操作信息中介系统DIOM之上概述了OpenCQ的初始实现。连续查询是常规查询，用于监视关注的更新并在更新达到指定阈值时返回结果。在OpenCQ中，用户可以向系统指定他们想要监视的信息（例如他们感兴趣的事件或更新阈值）。只要有兴趣的信息可用，系统就会立即将其传递给相关的用户；否则，系统会持续监视所需信息的到达，并在达到指定更新阈值时将其推送给相关用户。与传统的基于拉式的数据管理系统（例如DBMS和Web搜索引擎）相比，OpenCQ具有两个重要功能：它提供了启用推送，事件驱动，内容敏感的信息传递功能；它将拉和推服务组合在一个统一的框架中。通过事件驱动，我们的意思是要监视的感兴趣的更新事件由用户或应用程序指定。内容敏感意味着我们仅在发生潜在的有趣变化时才对触发条件进行评估。所谓“推动启用”，是指在没有用户干预的情况下主动交付查询结果或触发操作。

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