A Design Pattern Dictionary

Section 

2

 - The Dictionary

Foil 

30

 - Strategy

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    Page published 2003/12/11, updated 2009/8/2. Copyright © 2016 by Avner Ben. All rights reserved.

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"Dynamic classification": The implementation of a discrete object behavior (typically, less than a method) is determined during its creation and may be reconfigured later (e.g. formatting, in a configurable environment).

Challenge:

To encapsulate the specific behavior. To make it easily replaceable.

Skill:
View Wirechart

The system shall have the capability to reconfigure discrete functionality...

    UNCONDITIONAL (from outside) UNCONDITIONAL UNCONDITIONAL UNCONDITIONAL (from outside) ABSTRACT

    Participants:

    Context:

    Does part of its job by consulting an internal Strategy.

    Strategy:

    A procedure object, used in Context. Typically, does not contain data and receives all the arguments it needs when invoked (a fact that accounts for its expandability.) Strategies without data are often implemented as global variables, to be referenced by name.

    Signature:

    Context references global Strategy. Alternatively, Context contains Strategy (which contains data).

    Source:

    GOF.

    Scope:

    General. (In dynamically-typed languages, instance method override may do.)