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Large enterprise applications - the ones that execute core business applications, and keep a company going - must be more than just a bunch of code modules.
They must be structured in a way that enables scalability, security, and robust execution under stressful conditions, and their structure - frequently referred to as their architecture - must be defined clearly enough that maintenance programmers can quickly!
That is, these programs must be designed to work perfectly in many areas, and business functionality is not the only one although it certainly is the essential core. Of course a well-designed architecture benefits any program, and not just the largest ones as we've singled out here.
We mentioned large applications first because structure is a way of dealing with complexity, so the benefits of structure and of modeling and design, as we'll demonstrate compound as application size grows large.
Another benefit of structure is that it enables code reuse: Design time is the easiest time to structure an application as a collection of self-contained modules or components.
Eventually, enterprises build up a library of models of components, each one representing an implementation stored in a library of code modules. When another application needs the same functionality, the designer can quickly import its module from the library.
At coding time, the developer can just as quickly import the code module into the application. Modeling is the designing of software applications before coding. Modeling is an Essential Part of large software projects, and helpful to medium and even small projects as well.
A model plays the analogous role in software development that blueprints and other plans site maps, elevations, physical models play in the building of a skyscraper. Using a model, those responsible for a software development project's success can assure themselves that business functionality is complete and correct, end-user needs are met, and program design supports requirements for scalability, robustness, security, extendibility, and other characteristics, before implementation in code renders changes difficult and expensive to make.
Surveys show that large software projects have a huge probability of failure - in fact, it's more likely that a large software application will fail to meet all of its requirements on time and on budget than that it will succeed.
If you're running one of these projects, you need to do all you can to increase the odds for success, and modeling is the only way to visualize your design and check it against requirements before your crew starts to code.
Raising the Level of Abstraction Models help us by letting us work at a higher level of abstraction. A model may do this by hiding or masking details, bringing out the big picture, or by focusing on different aspects of the prototype.
Alternatively, you can focus on different aspects of the application, such as the business process that it automates, or a business rules view. The new ability to nest model elements, added in UML 2. You can use UML for business modeling and modeling of other non-software systems too.
Using any one of the large number of UML-based tools on the market, you can analyze your future application's requirements and design a solution that meets them, representing the results using UML 2. You can model just about any type of application, running on any type and combination of hardware, operating system, programming language, and network, in UML.
Its flexibility lets you model distributed applications that use just about any middleware on the market. You can do other useful things with UML too For example, some tools analyze existing source code or, some claim, object code! Some tools on the market execute UML models, typically in one of two ways: Some tools execute your model interpretively in a way that lets you confirm that it really does what you want, but without the scalability and speed that you'll need in your deployed application.
Other tools typically designed to work only within a restricted application domain such as telecommunications or finance generate program language code from UML, producing most of a bug-free, deployable application that runs quickly if the code generator incorporates best-practice scalable patterns for, e.
Our final entry in this category: Today, faced with an embarrassingly rich array of middleware platforms, the developer has three different middleware problems: First, selecting one; second, getting it to work with the other platforms already deployed not only in his own shop, but also those of his customers and suppliers; and third, interfacing to or, worse yet, migrating to a new "Next Best Thing" when a new platform comes along and catches the fancy of the analysts and, necessarily, CIOs everywhere.
In fact, a UML model can be either platform-independent or platform-specific, as we choose, and the MDA development process uses both of these forms: Every MDA standard or application is based, normatively, on a Platform-Independent Model PIMwhich represents its business functionality and behavior very precisely but does not include technical aspects.
This conversion step is highly automated, but not magic: Before the tool produces a PSM, the developer must annotate the base PIM to produce a more specific but still platform-independent PIM that includes details of desired semantics, and guides choices that the tool will have to make.
Because of the similarities among middleware platforms of a given genre - component-based, or messaging-based, for example - this guidance can be included in a PIM without rendering it platform-specific. Still, developers will have to fine-tune the produced PSMs to some extent, more in early days of MDA but less and less as tools and algorithms advance.The Unified Modeling Language (UML) was created to forge a common, semantically and syntactically rich visual modeling language for the architecture, design, and implementation of complex software systems both structurally and behaviorally.
• The Unified Modeling Language (UML) is a standard language for specifying, visualizing, constructing, and documenting the artifacts of different simple or complex systems. • The Unified Modeling Language (UML) is a standard language for specifying, visualizing, constructing, and documenting the artifacts of different simple or complex systems.
UML is popular for its diagrammatic notations. We all know that UML is for visualizing, specifying, constructing and documenting the components of software and non-software systems. Hence, visualization is the most important part which needs to be understood and .
How to depict “class uses class” relationship via UML.
Ask Question. What is the name of "class uses class" relationship in UML? Would you use the same relationships for both case A and case B? What UML arrow would you use to demonstrate this relationship? Well, you could use the "uses" relationship (dotted or dashed line, . In software engineering, a class diagram in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, operations (or methods), and the relationships among objects.