UML PROFILE FOR SAVECCM - Research

Component – based software engineering
framework ensure that extensions do not have unexpected interactions,
thus extensions may be independently developed and deployed.
• Reduced time to market. The uniform component abstractions and the
availability of components drastically reduce time it takes to design and
to develop a system. Design time is reduced because key architectural
decisions have been made and are embedded in the component model
and framework.
• Improved predictability. Since component models express design rules
that are enforced over all components deployed in a component-based
system, then various global properties can be designed into the
component model, so that properties such as security, scalability,
execution time and so forth can be predicted for the system.
• And many other advantages such as more effective management of
complexity, increased productivity, improved quality and a greater degree
of consistency
However, there are also some disadvantages and factors that can discourage
the application of component – based development approach [Crnković 02]:
• Time and effort required for development of components.
• Unclear and ambiguous requirements. One of the major problems of
software development comes from unclear, ambiguous, incomplete, and
insufficient requirements specifications. Reusable components are
intentend to be used in various applications, some of which may yet be
unknown and the requirements of which cannot be predicted. This makes
it more difficult to identify the requirements of the component properly.
• Conflict between usability and reusability. Component must be
sufficiently general, scalable, and adaptable in order to be widely
reusable. However this demand results with component to become more
complex (and thus more complicated to use) and more demanding of
computing resources (and thus more expensive to use).
• Component maintenance costs. Although application maintenance costs
can be lowered, component maintenance costs can be very high since
the component must respond to the different requirements of different
applications running in different environments and with different reliability
requirements.
• Reliability and sensitivity to changes. Because components and
applications have separate life cycles and different kinds of
requirements, there is some risk that a component will not completely
satisfy the particular requirements of certain applications or that it may
have characteristics not known to the application developer. When
5