Behavioral pattern

Template:Short description In software engineering, behavioral design patterns are design patterns that identify common communication patterns among objects. By doing so, these patterns increase flexibility in carrying out communication.

Design patterns

Examples of this type of design pattern include:

Blackboard design pattern

Provides a computational framework for the design and implementation of systems that integrate large and diverse specialized modules, and implement complex, non-deterministic control strategies

Chain-of-responsibility pattern

Command objects are handled or passed on to other objects by logic-containing processing objects

Command pattern

Command objects encapsulate an action and its parameters

"Externalize the stack"

Turn a recursive function into an iterative function that uses a stack

Interpreter pattern

Implement a specialized computer language to rapidly solve a specific set of problems

Iterator pattern

Iterators are used to access the elements of an aggregate object sequentially without exposing its underlying representation

Mediator pattern

Provides a unified interface to a set of interfaces in a subsystem

Memento pattern

Provides the ability to restore an object to its previous state (rollback)

Null object pattern

Designed to act as a default value of an object

Observer pattern

Defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. The variant weak reference pattern decouples an observer from an observable to avoid memory leaks in environments without automatic weak references.

Protocol stack

Communications are handled by multiple layers, which form an encapsulation hierarchy

Publish–subscribe pattern

A messaging pattern where senders (publishers) and receivers (subscribers) are decoupled via message topics and brokers. Commonly used in distributed systems, this pattern supports asynchronous, many-to-many communication.

Scheduled-task pattern

A task is scheduled to be performed at a particular interval or clock time (used in real-time computing)

Single-serving visitor pattern

Optimise the implementation of a visitor that is allocated, used only once, and then deleted

Specification pattern

Recombinable business logic in a boolean fashion

State pattern

A clean way for an object to partially change its type at runtime

Strategy pattern

Algorithms can be selected on the fly, using composition

Template method pattern

Describes the skeleton of a program; algorithms can be selected on the fly, using inheritance

Visitor pattern

A way to separate an algorithm from an object

See also

• Concurrency pattern
• Creational pattern
• Structural pattern