The objective of the project was to develop an open services architecture, and to show its practical relevance to the evolution of services for IBC. It achieved this objective by creating a common architectural approach and a system-level, object oriented architecture for service software; included in this architectural framework were both the control and management aspects associated with telecommunications software.
During 1989, the project demonstrated the feasibility of creating an open services architecture and its supporting infrastructure for the IBC. The ROSA architecture was defined using an object-oriented paradigm (model). An object encapsulates data, processing and communication. The behaviour and structure of an object is described by its type using a formal specification language. The boundaries of the objects are opaque and only the services provided are visible to other objects. Objects interact by synchronously exchanging messages. Distinct instances of ROSA objects operate concurrently and can be distributed.
Objects were classified into three categories: the Service Specification Framework (SSF), the Object Support Environment (OSE) and the Fundamental Object Mechanics (FOM). Objects in the SSF provide a pool of generic, telecom-oriented objects such as call handling and user agents. The OSE consists of entities that provide support for computation with objects in a distributed environment. The FOM is a set of primitives that are not subject to further object- oriented decomposition within the framework of the architecture.
ROSA has addressed the architectural problems associated with the management of real physical entities in an IBC telecommunications environment. This has resulted in service management being an integral part of any service specification.
Outline requirements for tool support were identified, to enable the realisation of services defined using the ROSA architecture. How such services may be specified by their behavioural and constructional properties can be determined by formal models and transformed into an abstract target language suitable for multi-vendor implementation.
The successful provision of open services in IBC will depend critically upon the integration of three service specification perspectives into the overall ROSA architectural framework.
R1068 ROSA project generated a new project - R1093 ROSA II.
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W1N 3AA London