Reference_description_with_linked_URLs_______________________	Notes_________________________________________________________________



http://wiki.c2.com/?PortlandPatternRepository http://c2.com/ppr/	Ward Cunningham - Portland Pattern Repository
	Gang of Four Design Patterns
https://www.tutorialspoint.com/design_pattern/factory_pattern.htm	G4 Pattern summary tutorials point
https://springframework.guru/gang-of-four-design-patterns/	G4 Pattern summary Spring - 1 page

	JEE Enterprise Services Patterns
	Enterprise Integration Patterns
https://microservices.io/patterns/index.html	Microservices Design Patterns
https://microservices.io/patterns/monolithic.html	Monolithic Architecture pattern
https://microservices.io/patterns/microservices.html	Microservices Architecture pattern

Key Concepts

G4 Pattern Summary

...

Chain of Responsibility. Delegates commands to a chain of processing objects.
Command. Creates objects which encapsulate actions and parameters.
Interpreter. Implements a specialized language.
Iterator. Accesses the elements of an object sequentially without exposing its underlying representation.
Mediator. Allows loose coupling between classes by being the only class that has detailed knowledge of their methods.
Memento. Provides the ability to restore an object to its previous state.
Observer. Is a publish/subscribe pattern which allows a number of observer objects to see an event.
State. Allows an object to alter its behavior when its internal state changes.
Strategy. Allows one of a family of algorithms to be selected on-the-fly at run-time.
Template Method. Defines the skeleton of an algorithm as an abstract class, allowing its sub-classes to provide concrete behavior.
Visitor. Separates an algorithm from an object structure by moving the hierarchy of methods into one object.

Image Added

text starts here

...