Wednesday, 09 April 2025

Servant (design pattern)

Servant is a design pattern used to offer some functionality to a group of classes without defining that functionality in each of them. A Servant is a class whose instance (or even just class) provides methods that take care of a desired service, while objects for which (or with whom) the servant does something, are taken as parameters.

Description and simple example

Servant is used for providing some behavior to a group of classes. Instead of defining that behavior in each class - or when we cannot factor out this behavior in the common parent class - it is defined once in the Servant.

For example: we have a few classes representing geometric objects (rectangle, ellipse, and triangle). We can draw these objects on some canvas. When we need to provide a “move” method for these objects we could implement this method in each class, or we can define an interface they implement and then offer the “move” functionality in a servant. An interface is defined to ensure that serviced classes have methods, that servant needs to provide desired behavior. If we continue in our example, we define an Interface “Movable” specifying that every class implementing this interface needs to implement method “getPosition” and “setPosition”. The first method gets the position of an object on a canvas and second one sets the position of an object and draws it on a canvas. Then we define a servant class “MoveServant”, which has two methods “moveTo(Movable movedObject, Position where)” and moveBy(Movable movedObject, int dx, int dy). The Servant class can now be used to move every object which implements the Movable. Thus the “moving” code appears in only one class which respects the “Separation of Concerns” rule.

This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Servant_(design_pattern)

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Latest News for: servant

Keep civil servants out of toxic politics

A Belgian royal claims he is a public servant. How about an entrance test for royals like him?

Former civil servant Lee Ek Tieng dies, aged 91

Can senior civil servants be active in politics? - PAS on BN Ayer Kuning candidate

Public servant accused of decade-long abuse linked to bikies, drugs: court documents

Wilma Newton remembered for servant heart

Workers, civil servants in Greece strike over cost-of-living crisis

Drug conviction costs public servant his job

Mayor Bowser to Host “Salute to Public Service” Ceremony Honoring Public Servants’ Contributions to Historic January Events (City of Washington, DC - District of Columbia)

Mayor Bowser to Host “Salute to Public Service” Ceremony Honoring Public Servants’ Contributions to Historic January Events (District of Columbia Executive Office of the Mayor)

Guidelines issued for civil servants using AI chatbots in Government work

ICYMI: POLITICO MORNING MONEY- Senator Alsobrooks Leads DMV Senators in Demanding Back Pay for Rehired Civil Servants (Angela D Alsobrooks)

Putra Heights Fire: Affected Civil Servants Allowed To Be Absent From Work - KPPA

Exposure To New Technologies Can Enhance Efficiency Of Civil Servants, Reduce Reliance On Foreign Consultants ...

Most public servant attrition comes from services, national security roles

Article Search

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