- المجال: Computer
- Number of terms: 4807
- Number of blossaries: 1
- Company Profile:
Sun Microsystems is a multinational vendor of computers, computer software and hardware, and information technology services.
The framework events of a J2EE component's existence. Each type of component has defining events that mark its transition into states in which it has varying availability for use. For example, a servlet is created and has its init method called by its container before invocation of its service method by clients or other servlets that require its functionality. After the call of its init method, it has the data and readiness for its intended use. The servlet's destroy method is called by its container before the ending of its existence so that processing associated with winding up can be done and resources can be released. The init and destroy methods in this example are callback methods. Similar considerations apply to the life cycle of all J2EE component types: enterprise beans, Web components (servlets or JSP pages), applets, and application clients.
Industry:Computer
The execution of two or more active threads or processes in parallel. On a uniprocessor apparent concurrence is accomplished by rapidly switching between threads. On a multiprocessor system true parallel execution can be achieved. See also asynchronous control, multiprocessor system, thread.
Industry:Computer
A self-contained functional software unit supported by a container and configurable at deployment time. The J2EE specification defines the following J2EE components:
*Application clients and applets are components that run on the client.
*Java servlet and JavaServer Pages (JSP) technology components are Web components that run on the server.
*Enterprise JavaBeans (EJB) components (enterprise beans) are business components that run on the server.
J2EE components are written in the Java programming language and are compiled in the same way as any program in the language. The difference between J2EE components and "standard" Java classes is that J2EE components are assembled into a J2EE application, verified to be well formed and in compliance with the J2EE specification, and deployed to production, where they are run and managed by the J2EE server or client container.
Industry:Computer
A model of the world that is used to formulate a computer solution to a problem. Paradigms provide a context in which to understand and solve a real-world problem. Because a paradigm is a model, it abstracts the details of the problem from the reality, and in doing so, makes the problem easier to solve. Like all abstractions, however, the model can be inaccurate because it only approximates the real world. See also Multiple Instruction Multiple Data, Single Instruction Multiple Data, Single Instruction Single Data, Single Program Multiple Data.
Industry:Computer
Software that provides services to an EJB container. For example, an EJB container typically relies on a transaction manager that is part of the EJB server to perform the two-phase commit across all the participating resource managers. The J2EE architecture assumes that an EJB container is hosted by an EJB server from the same vendor, so it does not specify the contract between these two entities. An EJB server can host one or more EJB containers.
Industry:Computer
A method of an enterprise bean that implements the business logic or rules of an application.
Industry:Computer
Software that provides services to access the Internet, an intranet, or an extranet. A Web server hosts Web sites, provides support for HTTP and other protocols, and executes server-side programs (such as CGI scripts or servlets) that perform certain functions. In the J2EE architecture, a Web server provides services to a Web container. For example, a Web container typically relies on a Web server to provide HTTP message handling. The J2EE architecture assumes that a Web container is hosted by a Web server from the same vendor, so it does not specify the contract between these two entities. A Web server can host one or more Web containers.
Industry:Computer
A mesh assembly on the system used to remove dust from the air that passes through it.
Industry:Computer
A medium that can retain information for subsequent retrieval. The term is most frequently used for referring to a computer's internal storage that can be directly addressed by machine instructions. See also cache, distributed memory, shared memory.
Industry:Computer
