Asynchronous monitoring of events for distributed cooperative environments

Chakravarthy, Sharma; Liao, Hui

doi:10.1109/codas.2001.945145

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…Many of the results achieved for relational or object-oriented active databases have recently been extended to tightly related research areas such as XML repositories and ontology storage systems. To the best of our knowledge, only few works (Dittrich, Fritschi, Gatziu, Geppert, and Vaduva, 2003;Chakravarthy and Liao, 2001;Cugola, Di Nitto, and Fuggetta, 2001) try to elevate the applicability of active rules from the data level to the application level and to eliminate the tedious mapping from active behavior requirements to data-centric active rules (Section 8 discusses related works in more detail). Besides DBMSs, there are several application areas, which could significantly benefit from an active rule support that also takes into account their application-or domain-specific peculiarities.…”

Section: Rationale and Backgroundmentioning

confidence: 99%

“…With respect to Sentinel, OES adopts a more simplified event definition mechanism and language. OES can detect database modification events at the very database level, without requiring services from external event detectors, as required by Chakravarthy and Liao, 2001. According to OES, the event detection takes place only locally, even if in a distributed database environment, and the consequent action -if needed -may require communication with other sites of the distributed environment.…”

Section: Active Database Management Systemsmentioning

confidence: 99%

“…Many of the results achieved for relational or object-oriented (OO) active databases have recently been extended to tightly related research areas such as XML (extensible markup language) repositories and ontology storage systems. To the best of our knowledge, only few works (Chakravarthy & Liao, 2001;Cugola, Di Nitto, & Fuggetta, 2001;Dittrich, Fritschi, Gatziu, Geppert, & Vaduva, 2003) try to elevate the applicability of active rules from the data level to the application level and eliminate the tedious mapping from active behavior requirements to data-centric active rules. (The eighth section discusses related works in more detail.)…”

Section: Rationale and Backgroundmentioning

confidence: 99%

“…Sentinel (Chakravarthy, 1997) was started as an OODBMS with event-based rules capable of defining composite events by an extended set of operators. Later on, the authors (Chakravarthy & Liao, 2001) extended the system to include asynchronous events for a distributed cooperative environment, obtaining a server that is not connected to any particular DBMS, but that runs as a message broker. With respect to Sentinel, OES adopts a more simplified event definition mechanism and language.…”

Section: Related Work Active Database Management Systemsmentioning

confidence: 99%

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An Open ECA Server for Active Applications

Daniel

Pozzi

2008

Journal of Database Management

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Event monitoring and active behaviors are important aspects in many software systems and application domains, not only in database management systems. In this paper, we propose an Event-Condition-Action (ECA) approach that spans from application data to application components and behaviors. Starting from an exception manager we previously developed in the context of a workflow management system, we derived an autonomous active component capable of handling a variety of events and of enacting actions in response to detected events. The ECA server runs as an autonomous engine and can be seamlessly integrated with existing systems, thus enhancing the systems’ functionalities and maintainability by separating active and non-active design concerns

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Section: Rationale and Backgroundmentioning

confidence: 99%

Section: Active Database Management Systemsmentioning

confidence: 99%

Section: Rationale and Backgroundmentioning

confidence: 99%

Section: Related Work Active Database Management Systemsmentioning

confidence: 99%

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An Open ECA Server for Active Applications

Daniel

Pozzi

2008

Journal of Database Management

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“…Beyond the above, work continued on distributed event specification, semantics, and detection [37,38,39,40,41]. Sentinel [5] developed a complete global event detector (or GED) that had well-defined semantics and used it for a number of real-world applications, such as monitoring multiple DBMSs to check on the viability of war-and peace-time plans that could change dynamically based upon changes to independent databases such as weather, intelligence information, maintenance of vehicles required for operation of plans, etc.…”

Section: Introductionmentioning

confidence: 99%

Events and streams

Chakravarthy

Adaikkalavan

2008

Proceedings of the Second International Conference on Distributed Event-Based Systems

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One of the purposes of this paper is to demonstrate the ubiquitous nature and relevance of simple and complex events in situation monitoring and other unforeseen applications. This paper retrospectively analyzes the progress of eventbased capability and their applicability in various domains. Although research on event-based approaches started in a humble manner with the intention of introducing triggers in database management systems for monitoring application state and to automate applications by reducing/eliminating user intervention, currently it has become a force to reckon with as it finds use in many diverse domains. This is primarily due to the fact that a large number of real-world applications are indeed event-driven and hence the paradigm is apposite.The other purpose of this paper is to identify and establish the synergy between stream processing and event processing. The resurgence of complex event processing (or CEP) has demonstrated the resiliency of this paradigm and its relevance to a large class of applications. In addition, the advent of stream processing based on sensor and other data generated on a continuous basis has, in our opinion, enhanced the role of events in critical ways. Instead of implicitly assuming event generation, stream processing indeed provides a powerful mechanism for generating interesting events.In this paper, we briefly overview the development of the ECA (or event-condition-action) paradigm. We briefly discuss the evolution of the ECA paradigm (or active capability) in Relational and Object-oriented systems. We then describe several diverse applications where the ECA paradigm has been used effectively. The applications range from customized monitoring of web pages to specification and enforcement of role-based access control policies (RBAC). The multitude of applications clearly demonstrate the ubiquitous

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Aiding the Development of Active Applications

Daniel

Pozzi

Advances in Database Research

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Active applications are characterized by the need for expressing, evaluating, and maintaining a set of rules that implement the application’s active behavior. Typically, rules follow the Event-Condition-Action (ECA) paradigm, yet oftentimes their actual implementation is buried in the application code, as their enactment requires a tight integration with the concepts and modules of the application. In this article, we propose a rule management system that allows developers to easily expand its rule processing logic with such concepts and modules and, hence, to decouple the management of their active rules from the application code. Our system derives from an exception manager that has previously been developed in the context of an industry-scale workflow management system and effectively allows developers to separate active and non-active design concern

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Asynchronous monitoring of events for distributed cooperative environments

Cited by 3 publications

References 6 publications

An Open ECA Server for Active Applications

An Open ECA Server for Active Applications

Events and streams

Aiding the Development of Active Applications

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