software architecture design methodology and styles pdf

Software Architecture Design Methodology And Styles Pdf

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Software Design Methodology - Ebook

Architectural design is a process for identifying the sub-systems making up a system and the framework for sub-system control and communication. The output of this design process is a description of the software architecture. Architectural design is an early stage of the system design process. It represents the link between specification and design processes and is often carried out in parallel with some specification activities. It involves identifying major system components and their communications.

Software architecture is most often represented using simple, informal block diagrams showing entities and relationships. Pros : simple, useful for communication with stakeholders, great for project planning. Cons : lack of semantics, types of relationships between entities, visible properties of entities in the architecture.

Architectural design is a creative process so the process differs depending on the type of system being developed.

However, a number of common decisions span all design processes and these decisions affect the non-functional characteristics of the system:. Systems in the same domain often have similar architectures that reflect domain concepts. Application product lines are built around a core architecture with variants that satisfy particular customer requirements. The particular architectural style should depend on the non-functional system requirements :. Each architectural model only shows one view or perspective of the system.

It might show how a system is decomposed into modules, how the run-time processes interact or the different ways in which system components are distributed across a network.

For both design and documentation, you usually need to present multiple views of the software architecture. Patterns are a means of representing, sharing and reusing knowledge. An architectural pattern is a stylized description of a good design practice , which has been tried and tested in different environments.

Patterns should include information about when they are and when the are not useful. Patterns may be represented using tabular and graphical descriptions. Application systems are designed to meet an organizational need. As businesses have much in common, their application systems also tend to have a common architecture that reflects the application requirements.

A generic application architecture is an architecture for a type of software system that may be configured and adapted to create a system that meets specific requirements. Reference: Sommerville, Software Engineering, 10 ed. The system is structured into three logical components that interact with each other. The Model component manages the system data and associated operations on that data. The View component defines and manages how the data is presented to the user. The Controller component manages user interaction e.

Problem description The display presented to the user frequently changes over time in response to input or computation. Different users have different needs for how they want to view the program. The system needs to reflect data changes to all users in the way that they want to view them, while making it easy to make changes to the user interface.

Solution description This involves separating the data being manipulated from the manipulation logic and the details of display using three components: Model a problem-domain component with data and operations, independent of the user interface , View a data display component , and Controller a component that receives and acts on user input.

Consequences Advantages: views and controllers can be easily be added, removed, or changed; views can be added or changed during execution; user interface components can be changed, even at runtime. Disadvantages: views and controller are often hard to separate; frequent updates may slow data display and degrade user interface performance; the MVC style makes user interface components views, controllers highly dependent on model components.

Name Layered architecture Description Organizes the system into layers with related functionality associated with each layer. A layer provides services to the layer above it so the lowest-level layers represent core services that are likely to be used throughout the system. When used Used when building new facilities on top of existing systems; when the development is spread across several teams with each team responsibility for a layer of functionality; when there is a requirement for multi-level security.

Advantages Allows replacement of entire layers so long as the interface is maintained. Redundant facilities e. Disadvantages In practice, providing a clean separation between layers is often difficult and a high-level layer may have to interact directly with lower-level layers rather than through the layer immediately below it. Performance can be a problem because of multiple levels of interpretation of a service request as it is processed at each layer.

Name Repository Description All data in a system is managed in a central repository that is accessible to all system components. Components do not interact directly, only through the repository. When used You should use this pattern when you have a system in which large volumes of information are generated that has to be stored for a long time. You may also use it in data-driven systems where the inclusion of data in the repository triggers an action or tool. Advantages Components can be independent--they do not need to know of the existence of other components.

Changes made by one component can be propagated to all components. All data can be managed consistently e. Disadvantages The repository is a single point of failure so problems in the repository affect the whole system. May be inefficiencies in organizing all communication through the repository.

Distributing the repository across several computers may be difficult. Name Client-server Description In a client-server architecture, the functionality of the system is organized into services, with each service delivered from a separate server.

Clients are users of these services and access servers to make use of them. When used Used when data in a shared database has to be accessed from a range of locations.

Because servers can be replicated, may also be used when the load on a system is variable. Advantages The principal advantage of this model is that servers can be distributed across a network. General functionality e. Disadvantages Each service is a single point of failure so susceptible to denial of service attacks or server failure. Performance may be unpredictable because it depends on the network as well as the system. May be management problems if servers are owned by different organizations.

Name Pipe and filter Description The processing of the data in a system is organized so that each processing component filter is discrete and carries out one type of data transformation.

The data flows as in a pipe from one component to another for processing. When used Commonly used in data processing applications both batch- and transaction-based where inputs are processed in separate stages to generate related outputs. Advantages Easy to understand and supports transformation reuse. Workflow style matches the structure of many business processes.

Evolution by adding transformations is straightforward. Can be implemented as either a sequential or concurrent system. Disadvantages The format for data transfer has to be agreed upon between communicating transformations. Each transformation must parse its input and unparse its output to the agreed form. This increases system overhead and may mean that it is impossible to reuse functional transformations that use incompatible data structures.

Separates presentation and interaction from the system data. The display presented to the user frequently changes over time in response to input or computation.

This involves separating the data being manipulated from the manipulation logic and the details of display using three components: Model a problem-domain component with data and operations, independent of the user interface , View a data display component , and Controller a component that receives and acts on user input. Advantages: views and controllers can be easily be added, removed, or changed; views can be added or changed during execution; user interface components can be changed, even at runtime.

Organizes the system into layers with related functionality associated with each layer. Used when building new facilities on top of existing systems; when the development is spread across several teams with each team responsibility for a layer of functionality; when there is a requirement for multi-level security. Allows replacement of entire layers so long as the interface is maintained. In practice, providing a clean separation between layers is often difficult and a high-level layer may have to interact directly with lower-level layers rather than through the layer immediately below it.

All data in a system is managed in a central repository that is accessible to all system components. You should use this pattern when you have a system in which large volumes of information are generated that has to be stored for a long time. Components can be independent--they do not need to know of the existence of other components. The repository is a single point of failure so problems in the repository affect the whole system.

In a client-server architecture, the functionality of the system is organized into services, with each service delivered from a separate server. Used when data in a shared database has to be accessed from a range of locations. The principal advantage of this model is that servers can be distributed across a network.

Each service is a single point of failure so susceptible to denial of service attacks or server failure.

The processing of the data in a system is organized so that each processing component filter is discrete and carries out one type of data transformation. Commonly used in data processing applications both batch- and transaction-based where inputs are processed in separate stages to generate related outputs.

Easy to understand and supports transformation reuse. The format for data transfer has to be agreed upon between communicating transformations.

10 Common Software Architectural Patterns in a nutshell

Sign in. Ever wondered how large enterprise scale systems are designed? Before major software development starts, we have to choose a suitable architecture that will provide us with the desired functionality and quality attributes. Hence, we should understand different architectures, before applying them to our design. According to Wikipedia,. An architectural pattern is a general, reusable solution to a commonly occurring problem in software architecture within a given context.


of software architecture and design concepts and will be in a position to choose and Lack of understanding of the design process, design experience and evaluation of The architectural style, also called as architectural pattern, is a set of.


Software Design Methodology - Ebook

Software Design Methodology explores the theory of software architecture, with particular emphasis on general design principles rather than specific methods. This book provides in depth coverage of large scale software systems and the handling of their design problems. It will help students gain an understanding of the general theory of design methodology, and especially in analysing and evaluating software architectural designs, through the use of case studies and examples, whilst broadening their knowledge of large-scale software systems.

Business Architecture Methodology. The architectural design process will be different from project to project, and from designer to designer. Finally we are able to produce a set of Council working drawings, from which we are able to extract further requirements as stated by the National building regulations and SANS 10 regulations, for energy efficiency calculations and fenestration requirements. Level 1 Format Preview.

Architectural design is a process for identifying the sub-systems making up a system and the framework for sub-system control and communication. The output of this design process is a description of the software architecture. Architectural design is an early stage of the system design process. It represents the link between specification and design processes and is often carried out in parallel with some specification activities.

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 Ключ… - Ее передернуло.  - Коммандер Стратмор отправил кого-то в Испанию с заданием найти ключ. - И что? - воскликнул Джабба.  - Человек Стратмора его нашел. Сьюзан, больше не в силах сдержать слезы, разрыдалась. - Да, - еле слышно сказала.  - Полагаю, что .

Он опустил шторку иллюминатора и попытался вздремнуть. Но мысли о Сьюзан не выходили из головы. ГЛАВА 3 Вольво Сьюзан замер в тени высоченного четырехметрового забора с протянутой поверху колючей проволокой. Молодой охранник положил руку на крышу машины. - Пожалуйста, ваше удостоверение.

 Ты же знаешь, что я бы осталась, - сказала она, задержавшись в дверях, - но у меня все же есть кое-какая гордость. Я просто не желаю играть вторую скрипку - тем более по отношению к подростку. - Моя жена вовсе не подросток, - возмутился Бринкерхофф.  - Она просто так себя ведет. Мидж посмотрела на него с удивлением. - Я вовсе не имела в виду твою жену.  - Она невинно захлопала ресницами.

999 999 999. Он ахнул.

Пора звонить Стратмору и выкладывать плохую новость: поиски зашли в тупик. Он сделал все, что мог, теперь пора ехать домой. Но сейчас, глядя на толпу завсегдатаев, пытающихся попасть в клуб, Беккер не был уверен, что сможет отказаться от дальнейших поисков. Он смотрел на огромную толпу панков, какую ему еще никогда не доводилось видеть. Повсюду мелькали красно-бело-синие прически.

Поэтому я хочу узнать мнение специалиста. - Что ж, - сказал Джабба, - мне неприятно первым тебя разочаровать, но твои данные неверны. - Ты так думаешь.

Не подведите .

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