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The Visitor [1] design pattern is one of the twenty-three well-known Gang of Four design patterns that describe how to solve recurring design problems to design flexible and reusable object-oriented software, that is, objects that are easier to implement, change, test, and reuse.
Design Patterns: Elements of Reusable Object-Oriented Software (1994) is a software engineering book describing software design patterns. The book was written by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides, with a foreword by Grady Booch. The book is divided into two parts, with the first two chapters exploring the capabilities ...
Visitor management. Visitor management refers to a set of practices or hardware additions that administrators can use to monitor the usage of a building or site. By gathering this information, a visitor management system can record the usage of facilities by specific visitors and provide documentation of visitor's whereabouts. [ 1]
Applicability. The single-serving visitor pattern should be used when visitors do not need to remain in memory. This is often the case when visiting a hierarchy of objects (such as when the visitor pattern is used together with the composite pattern) to perform a single task on it, for example counting the number of cameras in a 3D scene.
References. Adapter pattern. In software engineering, the adapter pattern is a software design pattern (also known as wrapper, an alternative naming shared with the decorator pattern) that allows the interface of an existing class to be used as another interface. [ 1 ] It is often used to make existing classes work with others without modifying ...
Software design pattern. In software engineering, a design pattern describes a relatively small, well-defined aspect (i.e. functionality) of a computer program in terms of how to write the code. Using a pattern is intended to leverage an existing concept rather than re-inventing it. This can decrease the time to develop software and increase ...
Digital Visitor and Resident. The Digital Visitor and Resident ( V&R) model provides a framework to depict how user preference and habit motivates engagement with technology and the web. V&R is commonly described as a continuum, with two modes of online engagement at either end, making a separation between different approaches to engagement.
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