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Glossary generate, create bar code 39 none with software projects Microsoft SQL Server concurrent Ref barcode 3 of 9 for None erring to a problem, process, system, or application in which many activities happen in parallel, where the order of incoming events is not usually predictable and is often overlapping. A concurrent system or application has many threads of control. Compare sequential.

concurrent collaboration diagram See concurrent communication diagram. concurrent communication diagram A communication diagram that depicts a network of concurrent objects and their interactions in the form of asynchronous and synchronous message communication. In UML 1.

x, it is referred to as a concurrent collaboration diagram. concurrent object An autonomous object that has its own thread of control. Also referred to as an active object, process, task, thread, concurrent process, or concurrent task.

concurrent process See concurrent object. concurrent service A service that services multiple client requests in parallel. Compare sequential service.

concurrent task See concurrent object. condition The value of a Boolean variable that can be true or false over a nite interval of time. connector An object that encapsulates the interconnection protocol between two or more components.

constraint A condition or restriction that must be true. control object An object that provides overall coordination for other objects. coordinator object An overall decision-making object that determines the overall sequencing for a collection of objects and is not state-dependent.

CORBA See Common Object Request Broker Architecture. critical section The section of an object s internal logic that is mutually exclusive. data abstraction An approach for de ning a data structure or data type by the set of operations that manipulate it, thus separating and hiding the representation details.

data abstraction class A class that encapsulates a data structure or data type, thereby hiding the representation details; operations provided by the class manipulate the hidden data. database wrapper class A class that hides how to access data stored in a database. data replication Duplication of data in more than one location in a distributed application to speed up access to the data.

deadlock A situation in which two or more concurrent objects are suspended inde nitely because each concurrent object is waiting for a resource acquired by another concurrent object. default feature A feature out of a group of alternative features in the same software product line that is automatically chosen if no other feature is explicitly selected in its place. delegation connector A connector that joins the outer port of a composite component to the inner port of a part component such that messages arriving at the outer port are forwarded to the inner port.

demand driven task A task that is activated on demand by the arrival of a message or internal event from another task.. Glossary deployment dia bar code 39 for None gram A UML diagram that shows the physical con guration of the system in terms of physical nodes and physical connections between the nodes, such as network connections. design concept A fundamental idea that can be applied to designing a system. design method A systematic approach for creating a design.

The design method helps identify the design decisions to be made, the order in which to make them, and the criteria used in making them. design modeling A phase of the COMET use case based software life cycle in which the software architecture of the system is designed. Compare analysis modeling and requirements modeling.

design notation A graphical, symbolic, or textual means of describing a design. design pattern A description of a recurring design problem to be solved, a solution to the problem, and the context in which that solution works. design strategy An overall plan and direction for developing a design.

device interface object An information hiding object that hides the characteristics of an I/O device and presents a virtual device interface to its users. device I/O boundary object A software object that receives input from and/or outputs to a hardware I/O device. discrete data Data that arrive at speci c time intervals.

distributed A system or application that is concurrent in nature and executes in an environment consisting of multiple nodes, which are in geographically different locations. distributed application An application that executes in a distributed environment. distributed component See component.

distributed kernel The nucleus of an operating system that supports distributed applications. distributed processing environment A system con guration in which several geographically dispersed nodes are interconnected by means of a local area or wide area network. distributed service A service with functionality that is spread over several server nodes.

domain analysis Analysis of a software product line. domain engineering See software product line engineering. domain modeling Modeling of a software product line.

domain-speci c pattern A software pattern that is speci c to a given software product line. domain-speci c software architecture See software product line architecture. dynamic analysis A strategy to help determine how the objects that participate in a use case interact.

Also referred to as behavioral analysis. dynamic model A view of a problem or system in which control and sequencing are considered, either within an object by means of a nite state machine, or by consideration of the sequence of interaction among objects. dynamic modeling The process of developing the dynamic model of a system.

EJB See Enterprise JavaBeans. encapsulation See information hiding. Enterprise JavaBeans (EJB) A Java-based component technology.

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