Early in a development, you have to choose the major technologies and elements on which the design depends. The areas in which these choices must be made include the following:. Base technology choices, such as the choice between a database and a file system, and the choice between a networked application and a web client, and so on.
NET Entity Framework. Integration method choices, for example between an enterprise service bus or a point-to-point channel. These choices are frequently determined by quality of service requirements such as scale and flexibility, and can be made before the detailed requirements are known. In a large system, the configuration of hardware and software are strongly interrelated.
The selections that you make affect how you use and interpret the architectural model. For example, in a system that uses a database, associations in a class diagram might represent relations or foreign keys in the database, whereas in a system that is based on XML files, associations might indicate cross-references that use XPath.
In a distributed system, messages in a sequence diagram can represent messages on a wire; in a self-contained application, they can represent function calls. A design pattern is an outline of how to design a particular aspect of the software, especially one that recurs in different parts of the system.
By adopting a uniform approach across the project, you can reduce the cost of design, ensure consistency in the user interface, and reduce the cost of understanding and changing the code. Some general design patterns such as Observer are well-known and widely applicable. In addition, there are patterns that are applicable just to your project. For example, in a web sales system, there will be several operations in the code where changes are made to a customer's order.
To ensure that the state of the order is accurately displayed at every stage, all these operations must follow a particular protocol to update the database. Part of the work of software architecture is to determine what patterns should be adopted across the design. This is usually an ongoing task, because new patterns and improvements to existing patterns will be discovered as the project progresses. It is helpful to organize the development plan so that you exercise each of your major design patterns at an early stage.
Most design patterns can be partly embodied in framework code. Part of the pattern can be reduced to requiring the developer to use particular classes or components, such as a database access layer that ensures the database is handled correctly. Description of the context in which it is applicable. What criteria should make a developer consider applying this pattern? Model of the major parts and their relationships. These might be classes or components and interfaces, with associations and dependencies between them.
The elements usually fall into two categories:. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Data Storage - These three tiers are separations within the application. What is Service Oriented architecture? Service oriented architecture is based on services. Service is a unit of some task performed by a service provider in order to satisfy the consumer What is three tier architecture?
The agent is responsible for gathering the results and returning a single response to the agent Explain the situations you will use a Web Service and Remoting in projects. Web services should be used if the application demands communication over a public network and require to work across multiple platforms Related Content.
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