An active functionality service for e-business applications
ACM SIGMOD Record
Engineering Event-Based Systems with Scopes
ECOOP '02 Proceedings of the 16th European Conference on Object-Oriented Programming
Moving Active Functionality from Centralized to Open Distributed Heterogeneous Environments
CooplS '01 Proceedings of the 9th International Conference on Cooperative Information Systems
Integrating Notifications and Transactions: Concepts and X2TS Prototype
EDO '00 Revised Papers from the Second International Workshop on Engineering Distributed Objects
The convergence of AOP and active databases: towards reactive middleware
Proceedings of the 2nd international conference on Generative programming and component engineering
Monitoring of Timing Constraints with Confidence Threshold Requirements
RTSS '03 Proceedings of the 24th IEEE International Real-Time Systems Symposium
Event Handling for the Universal Enterprise
Information Technology and Management
Determination of Time and Order for Event-Based Middleware in Mobile Peer-to-Peer Environments
PERCOMW '05 Proceedings of the Third IEEE International Conference on Pervasive Computing and Communications Workshops
Data management research at Technische Universität Darmstadt
ACM SIGMOD Record
SnoopIB: interval-based event specification and detection for active databases
Data & Knowledge Engineering
Database Challenges in Enterprise Information Sharing
IEEE Distributed Systems Online
Representation and processing of information related to real world events
Knowledge-Based Systems
What is "next" in event processing?
Proceedings of the twenty-sixth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
A practical approach for enabling online analysis of event streams
Proceedings of the 2007 inaugural international conference on Distributed event-based systems
Monitoring of Timing Constraints with Confidence Threshold Requirements
IEEE Transactions on Computers
A metamodel for distributed event based systems
Proceedings of the second international conference on Distributed event-based systems
A framework for event composition in distributed systems
Proceedings of the ACM/IFIP/USENIX 2003 International Conference on Middleware
The SpaTeC composite event language for spatio-temporal reasoning in mobile systems
Proceedings of the Third ACM International Conference on Distributed Event-Based Systems
Event detection and correlation for network environments
IEEE Journal on Selected Areas in Communications
Cordies: expressive event correlation in distributed systems
Proceedings of the Fourth ACM International Conference on Distributed Event-Based Systems
Reliable complex event detection for pervasive computing
Proceedings of the Fourth ACM International Conference on Distributed Event-Based Systems
Proceedings of the First International Workshop on Data Dissemination for Large Scale Complex Critical Infrastructures
REaltime ACtive heterogeneous systems: where did we reach after REACH?
From active data management to event-based systems and more
Implementing a practical spatio-temporal composite event language
From active data management to event-based systems and more
Unified semantics for event correlation over time and space in hybrid network environments
OTM'05 Proceedings of the 2005 Confederated international conference on On the Move to Meaningful Internet Systems - Volume >Part I
Ubiquitous computing: challenges in flexible data aggregation
EUC'05 Proceedings of the 2005 international conference on Embedded and Ubiquitous Computing
Semantic characterization of real world events
DASFAA'05 Proceedings of the 10th international conference on Database Systems for Advanced Applications
A taxonomy and representation of sources of uncertainty in active systems
NGITS'06 Proceedings of the 6th international conference on Next Generation Information Technologies and Systems
Deriving a unified fault taxonomy for event-based systems
Proceedings of the 6th ACM International Conference on Distributed Event-Based Systems
From calls to events: architecting future BPM systems
BPM'12 Proceedings of the 10th international conference on Business Process Management
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Many interesting application systems, ranging from workflow management and CSCW to air traffic control, are event-driven and time-dependent and must interact with heterogeneous components in the real world. Event services are used to glue together distributed components. They assume a virtual global time base to trigger actions and to order events. The notion of a global time that is provided by synchronized local clocks in distributed systems has a fundamental impact on the semantics of event-driven systems, especially the composition of events. The well studied 2g-precedence model, which assumes that the granularity of global time-base g can be derived from a priori known and bounded precision of local clocks may not be suitable for the Internet where the accuracy and external synchronization of local clocks is best effort and cannot be guaranteed because of large transmission delay variations and phases of disconnection. In this paper we introduce a mechanism based on NTP synchronized local clocks with global reference time injected by GPS time servers. We argue that timestamps of events can be related to global reference time with bounded accuracy and propose that event timestamps are modeled using accuracy intervals. We present algorithms for event composition and event consumption which make use of accuracy interval based timestamping and illustrate the problems that arise due to inaccuracy and message transmission delays.