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In object-oriented programming, the command pattern is a behavioral design pattern in which an object is used to encapsulate all information needed to perform an action or trigger an event at a later time. This information includes the method name, the object that owns the method and values for the method parameters. The central ideas of this design pattern closely mirror the semantics of first-class functions and higher-order functions in functional programming languages. Specifically, the invoker object is a higher-order function of which the command object is a first-class argument.

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rdf:type	disease
rdfs:label	Command pattern (en)
rdfs:comment	In object-oriented programming, the command pattern is a behavioral design pattern in which an object is used to encapsulate all information needed to perform an action or trigger an event at a later time. This information includes the method name, the object that owns the method and values for the method parameters. The central ideas of this design pattern closely mirror the semantics of first-class functions and higher-order functions in functional programming languages. Specifically, the invoker object is a higher-order function of which the command object is a first-class argument. (en)
sameAs	Command pattern Command pattern
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Subject	Articles with example C Sharp code Articles with example JavaScript code Articles with example Java code Articles with example Python (programming language) code Articles with example Ruby code Articles with example Scala code Software design patterns
Link from a Wikipage to an external page	http://msdn.microsoft.com/en-us/library/ms752308.aspx https://wiki.c2.com/%3FCommandPattern https://www.infoworld.com/article/2077569/java-tip-68--learn-how-to-implement-the-command-pattern-in-java.html
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Link from a Wikipage to another Wikipage	Macro (computer science) Priority queue Progress bar Undo Unified Modeling Language Ambiguity Behavioral pattern Bertrand Meyer Sequence diagram Thread pool Articles with example C Sharp code Articles with example JavaScript code Articles with example Java code Articles with example Python (programming language) code Articles with example Ruby code Articles with example Scala code Software design patterns Job queue Job scheduler Object-Oriented Software Construction Object-oriented programming Object composition Wizard (software) Chain-of-responsibility pattern Class diagram Delphi (software) Closure (computer programming) Code mobility Command queue Higher-order function Homonym Software design pattern Database transaction First-class function Function object Functional programming Swing (Java) Synonym Design Patterns Information hiding Model–view–controller Windows Presentation Foundation
has abstract	In object-oriented programming, the command pattern is a behavioral design pattern in which an object is used to encapsulate all information needed to perform an action or trigger an event at a later time. This information includes the method name, the object that owns the method and values for the method parameters. Four terms always associated with the command pattern are command, receiver, invoker and client. A command object knows about receiver and invokes a method of the receiver. Values for parameters of the receiver method are stored in the command. The receiver object to execute these methods is also stored in the command object by aggregation. The receiver then does the work when the execute method in command is called. An invoker object knows how to execute a command, and optionally does bookkeeping about the command execution. The invoker does not know anything about a concrete command, it knows only about the command interface. Invoker object(s), command objects and receiver objects are held by a client object, the client decides which receiver objects it assigns to the command objects, and which commands it assigns to the invoker. The client decides which commands to execute at which points. To execute a command, it passes the command object to the invoker object. Using command objects makes it easier to construct general components that need to delegate, sequence or execute method calls at a time of their choosing without the need to know the class of the method or the method parameters. Using an invoker object allows bookkeeping about command executions to be conveniently performed, as well as implementing different modes for commands, which are managed by the invoker object, without the need for the client to be aware of the existence of bookkeeping or modes. The central ideas of this design pattern closely mirror the semantics of first-class functions and higher-order functions in functional programming languages. Specifically, the invoker object is a higher-order function of which the command object is a first-class argument. (en)
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is Wikipage redirect of	Command Pattern The command pattern
is Link from a Wikipage to another Wikipage of	Behavioral pattern Bertrand Meyer Callback (computer programming) Genera (operating system) Job queue Object-oriented programming Chain-of-responsibility pattern Decorator pattern Closure (computer programming) Command Command Pattern Command queue Function object GRASP (object-oriented design) Graphical Editing Framework Design Patterns Hash table MacApp JDBCFacade
is foaf:primaryTopic of	http://en.wikipedia.org/wiki/Command_pattern

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