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All ZOO MIDTERM PAST PAPERS SOLVED
All ZOO MIDTERM PAST PAPERS SOLVED
This is the most commonly used component to achieve external abstraction using decomposition. A subsystem is a functionally cohesive grouping of classes that is a major part of a larger aggregate system.
They can be independently ordered, configured, or delivered and are related to each other via dependency relations, and communicate with each other via well-defined interfaces.
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The rule of thumb is to decompose a system by functional services i-e Database Subsystem, User Interface Subsystem, etc; so that related services are combined under one component.
We try to transform the set of requirements into a structured design in which there is no relationship of parent/child or master-detail etc; subsystem basically defines the executable components typically represented by interfaces at the implementation level for communication,
The essence of the subsystem is that logically related requirements are combined under one component so that efficiency can be achieved as we move forward in the software design process.
Defining subsystems usually involves neutralizing, evaluating, and checking them Solutions It is important to get the correct decomposition.
The main advantage of the subsystem is this These subsystems are implemented by different teams depending on the components, but they should be Kept in mind that bad parsing can lead to impractical projects.
Chart A representation of the subsystem is shown below: II. Levels – vertical decomposition Decomposing the system into smaller and more manageable units that are arranged hierarchically.
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Each level provides a level of abstraction. A layer only uses services of the next underlying layer. A layer supplies services to the next top layer as each layer can be tested independently and can be substituted (machine independence).
Layers help to structure applications that can be decomposed into groups of subtasks in which each group of subtasks is at a particular level of abstraction. Imagine that you are designing a system whose dominant characteristic is a mix of low- and high-level issues, where high-level operations rely on the lower-level ones.
Some parts of the system handle low-level issues such as hardware traps, sensor input, reading bits from a file, or electrical signals from a wire.
At the other end of the spectrum, there may be user-visible functionality such as the interface of a multi-user game or high-level policies such as telephone billing tariffs.
A typical communication flow pattern consists of top-down requests. Low-level response to requests, incoming data, or notifications of events going in the reverse direction.
Such systems also often require an orthogonal horizontal structure. for their vertical subdivision. This is the case when multiple operations are at the same level intangible, but largely independent of each other.
