Behavioral pattern

A behavioral pattern is a software design pattern for collaboration between objects.

Examples

Examples 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 ^[1]

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

Acts 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. ^[2]

Protocol stack

Communications are handled by multiple layers, which form an encapsulation hierarchy ^[3]

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

References

1. "Externalize The Stack". c2.com. 2010-01-19. Archived from the original on 2011-03-03. Retrieved 2012-05-21.
2. Nakashian, Ashod (2004-04-11). "Weak Reference Pattern". c2.com. Archived from the original on 2011-03-03. Retrieved 2012-05-21.
3. "Protocol Stack". c2.com. 2006-09-05. Archived from the original on 2011-03-03. Retrieved 2012-05-21.