The active badge location system
ACM Transactions on Information Systems (TOIS)
Managing semantic heterogeneity in databases: a theoretical prospective
PODS '97 Proceedings of the sixteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
A framework to support mobile users of multimedia applications
Mobile Networks and Applications - Special issue on mobile computing and system services
The object data standard: ODMG 3.0
The object data standard: ODMG 3.0
Using events to build large scale distributed applications
EW 7 Proceedings of the 7th workshop on ACM SIGOPS European workshop: Systems support for worldwide applications
The Inter-Database Instance Identification Problem in Integrating Autonomous Systems
Proceedings of the Fifth International Conference on Data Engineering
Entity Identification in Database Integration
Proceedings of the Ninth International Conference on Data Engineering
Federated Database Systems for Managing Distributed, Heterogeneous, and Autonomous Databases
VLDB '91 Proceedings of the 17th International Conference on Very Large Data Bases
Extending ODMG for federated database systems
DEXA '96 Proceedings of the 7th International Workshop on Database and Expert Systems Applications
COBEA: a CORBA-based event architecture
COOTS'98 Proceedings of the 4th conference on USENIX Conference on Object-Oriented Technologies and Systems - Volume 4
An architecture to support storage and retrieval of events
Middleware '98 Proceedings of the IFIP International Conference on Distributed Systems Platforms and Open Distributed Processing
Publish-Subscribe Grows Up: Support for Management, Visibility Control, and Heterogeneity
IEEE Internet Computing
Cascadia: A System for Specifying, Detecting, and Managing RFID Events
Proceedings of the 6th international conference on Mobile systems, applications, and services
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The Cambridge Event Architecture has added events to an object-oriented, distributed programming environment by using a language independent interface definition language to specify and publish event classes. Here we present an extension to CEA using the ODMG standard, which unifies the transmission and storage of events. We extend the existing model with an ODL parser, an event stub generator, a metadata repository and an event library supporting both C++ and Java. The ODMG metadata interface allows clients to interrogate the system at run time to determine the interface specifications for subsequent event registration. This allows new objects to be added to a running system and independently developed components to interwork with minimum prior agreement. Traditional name services and interface traders can be defined more generally using object database schemas. Type hierarchies may be used in schemas. Matching at a higher level in the type hierarchy for different domains is possible even though different specialisations are used in individual domains. Using metadata to describe events provides the basis for establishing contracts between domains. These are used to construct the event translation layer between heterogeneous domains.