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and to match use of IT resources to business demand the ASP has joined a commu-
nity of Cloud platform providers that can offer the resources, platform and infra-
structure services that the ASP needs in order to provide this in-cloud application
as SaaS to its own user community. In order to monitor service usage and optimise
resource utilisation the ASP creates an instance of the application for each customer
it serves based on Quality of Service parameters that reflect the corresponding
customer agreement (SLA). A separate reference to a service endpoint is produced
for each instance of the application. The creation of the application instance is initi-
ated via the ASP via Cloud service management interfaces that are offered by the
Cloud platform federation (represented by a Broker).
Fig. 8.9: Creation of in-cloud SaaS application instances on an in-cloud Hosting Environment
The ASP is assured by the Broker (representing the Cloud platform federation),
based on its visibility of the SLAs provided by the Cloud operators, that the created
instance can meet the SLA it has agreed with its customer and is provided with the
necessary capabilities for managing the life-cycle of the application instance and the
policies governing the (virtual) service delivery platform through which the applica-
tion is offered to the ASP's customers. The ASP is not exposed to the complexity
and heterogeneity of the capabilities that have been combined in order to allow the
application service delivery. Unless described in the SLA, the ASP avoids exposure
to the specifics of where specific application resources have been deployed. The
ASP has delegated to the community of Cloud platform providers (represented by
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