Cloud Computing and SOA Convergence in Your Enterprise: A Step ...

Where Are the Applications 183
Data
Services
Processes
Data
PaaS
Data
Data
Data
IaaS
DaaS
Figure 10.2 We allocate some of the data, services, and processes to cloud computing
platforms, where it makes sense to do so. In this example, we use platformas-a-service
(PaaS), infrastructure-as-a-service (IaaS), and database-as-a-service
(DaaS). However, your cloud needs are largely dependent on your own business
and technology requirements.
Figure 10.3 shows the architecture depicted in Figure 10.2, but this time
we defined applications, or bundles of data, processes, and services that can
be considered applications or, more accurately, composite applications. These
can exist on a single platform, on-premise, or in the clouds, or they can exist
between on-premise platforms and the clouds.
The applications are what the business sees out of the architecture, and
they are very important to the architecture. Also, keep in mind that applications
should share services, processes, and data, thus promoting the benefit of
reuse for our SOA using cloud computing. Moreover, the architecture should
support the core concept of agility, meaning that it can change through configuration
mechanisms and not drive continual redevelopment.