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6.3 The iCore Functional Architecture 255
(Input) — Comprehension (Processing) — Adaptation (Response) tuned to
specific goals.
Specific CVOs are devoted to the particular task of observation of events
though CVO processing, as particularly meaningful and relevant to the ‘situation’
that a particular person or service is in. These CVOs are called Situation
Observers (SO). The SOs are considered to provide runtime input to the Situation
Awareness through the Queried Fast Collector.
The Queried Fast Collector is used to aggregate the subscribed event
streams and to deliver the outcome to the Situation Detection of the Situation
Awareness, having the latter to create the RWK. The information (about
specific RW instances) captured through the event streams is stored in the
Real World Information (RWinfo) Database. Finally the Real World Knowledge
Model is used for the internal data representation of RWK and we assume
that ‘knowledge’ can be captured in RDF graphs, and so an RWK Model Store
can be used to memorise the reflection of the real world’s rules of behaviour
in the iCore system.
6.3.3.2 CVO Level
The CVO level receives from the Service level a Service Execution Request.
The first point of contact in the CVO level is the CVO Management Unit
which comprises the CVO Lifecycle Manager an intelligent monitoring unit
keeping track of the changing states of the collection of running CVOs. At the
time of a Service Execution Request, the lifecycle manager needs to check
if CVO instances for a specific CVO template are already running and could
be reused, and otherwise needs to instantiate a new CVO through the CVO
Factory. When CVOs are used in the context of multiple service execution
requests the potentially different service objectives must be coordinated for
potential conflict resolution (Coordination functional block). The Performance
Management intends to guarantee the proper performance of the CVO Level
in terms of satisfying specific Key Performance Indicators (KPIs) thresholds.
The Quality Assurance targets mainly at the satisfaction of the SLAs as delivered
by the Service Level. Both the Performance Management and the Quality
Assurance may trigger reconfiguration actions in order to improve the performance
and the quality of service respectively.
CVO Factory: While the CVO Management Unit is more about the
execution/runtime aspects of resource management, the CVO factory is