Activity specification using rendezvous
The aim of this paper is to present an active relational DBMS which is typed and extensible (its domains are extended to Abstract Data Types). We were inspired by the notion of tasks in the Ada1 programming language to specify the activity in the system. Users dispose of a constructor to create rule behaviour models (called rule type) for describing the behaviour of objects of this type when activated. Users can therefore create object “rules” and define relation attributes as rules.
Like an Ada task, each rule is a program unit that runs in parallel with other rules or programs. Its role is to execute services in response to requests. Synchronisation between the appellant and the rule is achieved using the principle of rendezvous. When an event occurs the system generates a rendezvous request with the concerned rules and services. We use the rendezvous principle to implement composite events.
Key wordsActive DBMS's Ada Tasks Composite Events Type
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