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CHAPTER 4.
MYSIM MIDDLEWARE IMPLEMENTATION
Handling the QoS non-functional properties
We begin by examining the time execution and memory consumption of the QoS function
that calculates for a set of non-functional properties the QoS degree related to a predefined service
non-functional properties that we wish to replace.
Figure 4.23 gives the time execution and memory consumption for quantitative non-functional
properties QoS degree function computing. We suppose that each service has one quantitative nonfunctional
property.
Figure 4.23: Time and memory consumption for QoS degree computing
As we can see the computing time is quick and it does not require much memory. For the
qualitative non-functional properties, the concept matching depends on the size of the employed
ontology that contains the corresponding concepts. For now no test were conducted to evaluate
the time of the execution engine depending on the size of the ontology, but first results show that
the time undertaken is much more important than for the quantitative non-functional properties
computing.
Once the concept matched, the computing of the semantic distance takes as much time as the
one for computing the quantitative non-functional properties QoS degree.
The sorting of the services sets provided by the QoS Service is relatively quick as shown
figure 4.24.
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