The MVC architecture is a widely used architectural approach for interactive applications that separates functionality among application objects so as to minimize the degree of coupling between the objects. To achieve this, it divides applications into three layers: model, view, and controller.

Document/View is a specialization of MVC, in which the Model is the Document, and the View and the Controller are combined into the View. In MVC the Controller takes care of user interaction with the View - how the view is changed. Because most GUI's contain widgets or controls which already take care of user interaction (e.g. You can click on a combo box to change it's contents) I don't see any sense in having a separate controller. See similar questions...

Answer : The swing components are based on the model-view-controller (MVC) design. Components of the MVC models are as follows: Model -- The model encompasses the state data for each component. View -- The view refers to how each component will appear on the screen. Controller -- The controller is the portion of the user interface that dictates how the components interact with events (e.g., keyboard events, mouse clicks). See similar questions...

The role of controller is to dictate what to do behind the scenes and what to display in the view next. 1. Controller receives a request 2. Controller... See similar questions...

No. To some extent, this falls into performance optimization. We do provide strategies such as using a Stateless Session Bean EJB to hold onto reuseable resources and the ServiceLocator pattern. We don't really address caching of application data very much. We also have some strategies for extending the petstore app to do some caching which have been discussed on the J2EE BluePrints interest list. See similar questions...

This pattern has become popular for Web application development, but it has existed for much longer. Implementations of the pattern have been refined over time and products have been developed to implement it as a framework. You can use Java projects such as Struts and Hibernate to develop applications that leverage the MVC architecture. In the Rails framework, ActiveRecord deals with Model concerns. See similar questions...

You need to add the bean to your HttpServletRequest object using setAttribute(String name, Object yourObject); Then you need to obtain a handle to the... See similar questions...

Model/View/Controller is a design pattern used extensively in JDK 1.2. Basically, the "model" contains your data, the "view" is the graphical representation, and the "controller" is responsible for telling the "model" what happens in the "view". See similar questions...

For business application development the MDA is proving to be virtually inconsequential, arguably nothing more than a marketing campaign for the CASE tool vendors. For embedded software development MDA appears to have gained significant ground. If you're thinking about taking an MDA approach I highly suggest that you determine if you're ready for the MDA. If it is, then the Roadmap for Agile MDA is likely a good starting point. See similar questions...

Answer : The Swing components actually make use of a simplified variant of the MVC model called model-delegate. This design combines the view and controller objects into a single element that draws the component to the screen and handles GUI events know as the user interface (UI) delegate. Bundling of the graphics capabilities and event handling in Swing components makes sense in Java because most of the event handling is taken care of by the AWT. See similar questions...

MVC stands for Model-View-Controller. Model stores information/data. Model notifies its dependents whenever one or more of its variables is changed. View is the component for displaying output. Contoller is the component that enables the user to interact with, or control, the application. See similar questions...

MFC does not force you to use document/views. Check out hello, mdi, and helloapp samples, they don't use it at all. Most MFC features can be used in non-document/view applications. You do lose features like print preview and of many OLE features when you don't go document/view. See similar questions...

Yes. Sometimes model gains change due to the non-linear nature of the process, such as in an ethylene plant where feedstock changes have a significant impact on the cracking furnace ethylene yields. For applications of this type, Honeywell’s Profit Bridge can be used to link the rigorous model to Profit Controller and update the model gains to address the non-linearity. See similar questions...

The MDA is a new way of developing applications and writing specifications, based on a platform-independent model (PIM) of the application or specification's business functionality and behavior. A complete MDA specification consists of a definitive platform-independent base model, plus one or more platform-specific models (PSM) and sets of interface definitions, each describing how the base model is implemented on a different middleware platform. See similar questions...

There is a lot of material available at OMG's MDA site. If you just want to get a quick overview, try An introduction to Model Driven Architecture by Allan Brown and Jim Conallen: See similar questions...

Under the auspices of the OASIS standards consortium, a group of end users, software vendors, and other interested parties came together to help define a reference model for Service Oriented Architecture (SOA). SOA itself is used in multiple contexts within the software industry with confusing, differing and even conflicting definitions. See similar questions...

The application is a client server application operating under a Windows-based graphical user interface and using SQL as the database . See similar questions...

Powered by SprayLogic™ software*, the Model 2250 controller accurately monitors and automatically controls variables optimizing spray such as liquid flow rate, liquid pressure, atomizing air pressure and fan air pressure. The controller allows precise spray cycle control and can also monitor external conditions, such as conveyor speed, temperature and humidity that can critically affect the efficiency of your spraying system. See similar questions...

It depends on the flow rate capabilities of the device used to measure the flow. Depending on the type of flowmeter used, changes in viscosity, specific gravity and temperature of the fluid could produce effects detrimental to flow meter performance. We have successfully used a line of very sensitive coriolis-type flowmeters which are available in ranges down to 0.007 GPM. See similar questions...