Dmytro Borysovskyi dimabory

Each unit should have only limited knowledge about other units: only units "closely" related to the current unit.
Each unit should only talk to its friends; don't talk to strangers.
Only talk to your immediate friends.

https://www2.ccs.neu.edu/research/demeter/demeter-method/LawOfDemeter/paper-boy/demeter.pdf

More formally, the Law of Demeter for functions requires that a method m of an object O may only invoke the methods of the following kinds of objects:

O itself

http://wiki.c2.com/?AntiPatternsCatalog

ORGANISATIONAL
PROJECT MANAGEMENT
ANALYSIS
SOFTWARE DESIGN
PROGRAMMING
OBJECT-ORIENTED DESIGN
METHODOLOGICAL

Think about Shared Kernel (http://ddd.fed.wiki.org/view/welcome-visitors/view/domain-driven-design/view/shared-kernel)

src/
    Infrastructure/
        Auth/                                   
            ...                                 // e.g. Symfony/ (acl, voters) 
        Framework/
            ...                                 // e.g. Symfony kernel or Zend Expressive
        Persistence/

General Responsibility Assignment Software Patterns

http://www.it.uu.se/edu/course/homepage/asd/ht14/Lecture%204.pdf
https://web.cs.dal.ca/~jin/3132/lectures/dp-13.pdf
https://www.cs.cmu.edu/~aldrich/214/slides/design-grasp.pdf
https://dzone.com/articles/solid-grasp-and-other-basic-principles-of-object-o

A collection of patterns/principles for achieving good design – patterns of assigning responsibility. Refer to software objects not domain objects.

	VO	DTO
Data	yes	yes
Logic	yes	no
Identity	no	no
Immutability	yes	no

VO

final class Address

MQTT - Message Queue Telemetry Transport

http://mqtt.org

MQTT stands for MQ Telemetry Transport. It is a publish/subscribe, extremely simple and lightweight messaging protocol, designed for constrained devices and low-bandwidth, high-latency or unreliable networks. The design principles are to minimise network bandwidth and device resource requirements whilst also attempting to ensure reliability and some degree of assurance of delivery. These principles also turn out to make the protocol ideal of the emerging “machine-to-machine” (M2M) or “Internet of Things” world of connected devices, and for mobile applications where bandwidth and battery power are at a premium.

AMQP - Advanced Message Queueing Protocol

https://www.amqp.org/

The Advanced Message Queuing Protocol (AMQP) is an open standard for passing business messages between applications or organizations. It connects systems, feeds business processes with the information they need and reliably transmits onward the instructions that achieve the

(DDD) Domain Driven Design
(TDD) Test-Driven Development
(BDD) Behavior-Driven Development
(TBD) Trunk Based Development

(MDA) ~~Model Driven Architecture~~

(MVC, MVP, ~~MMVM~~) ~~Model-View-Controller, ...~~
(ADR) - Action Domain Responder

Ubiquitous Language
Bounded Context
Context Map
Domain, Aggregate, Domain Events
Entities, Value Objects, Services, Repositories

The Ubiquitous Language is a shared language developed by the team—a team composed of both domain experts and software developers.

A Bounded Context is an explicit boundary within which a domain model exists. Inside the boundary all terms and phrases of the Ubiquitous Language have specific meaning, and the model reflects the Language with exactness.

ReactPHP

https://reactphp.org/ https://github.com/reactphp

➕ pros

production-ready
API

➖ cons

	http://wiki.c2.com/?AlanKaysDefinitionOfObjectOriented

	1. Everything Is An Object.
	2. Objects communicate by sending and receiving messages (in terms of objects).
	3. Objects have their own memory (in terms of objects).
	4. Every object is an instance of a class (which must be an object).
	5. The class holds the shared behavior for its instances (in the form of objects in a program list)
	6. To eval a program list, control is passed to the first object and the remainder is treated as its message.

	This definition is derived from early versions of Smalltalk (Smalltalk-72?), and rules 5 and 6 clearly show Smalltalk's Lisp heritage. Kay remarked as such, noting that rules 4-6 would mutate as Smalltalk developed.