Николай Паламарчук "Управление зависимостями в больших проектах"

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Ruling dependencies in big
projects
Mykola Palamarchuk
Upwork
lividgreen@gmail.com
https://github.com/lividgreen
twitter: ...

1.
Growing projects
Strategy of successful owning

Growing projects

“
“Divide and conquer” is gaining
and maintaining power by
breaking up larger concentrations
of power into pieces that
ind...

Growing projects: divide and conquer concept
In politics and sociology, divide and conquer
concept refers to a strategy th...

Growing projects: dependencies
Project parts have
dependencies on
each other.
How should we rule
them all to prevent
our p...

“
Dependency hell is a colloquial
term for the frustration of some
software users who have installed
software packages whi...

2.
Static PHP code
dependencies
Reaching a successful compilation
of all the project code parts

PHP code dependencies: retrospective
1. svn externals, git modules etc.
2. pear
3. custom solutions (like Symfony1 plugins...

Composer
helps us to manage
dependencies of our
PHP code

Composer
◎ Written in PHP, portable
◎ A lot of features, configurable
◎ Based on semver.org specification

Semver
MAJOR.MINOR.PATCH
◎ Declare public API as precise as possible
○ precise and unambiguous
○ concise
○ complete
◎ Use ...

Semver and common mistakes
Dependencies of your dependencies are
not your own dependencies (may
disappear!)
Add all depend...

Composer and dependency hell
◎ Composer doesn’t allow different versions
of packages installed together
◎ Composer resolve...

Composer and dependency hell: solutions?
◎ Avoid dependencies?
We must explore the nature of code
dependencies before maki...

Composer and Big Projects: HOWTO
★ Profess semver.org everywhere
★ Use Composer aliases
○ test your contributions to open-...

3.
Dynamic
dependencies
Managing your runtime
components

Components
Framework
Common
functionality to run
your application
parts
Module
(plugin/bundle/...)
Named and
separated par...

Components: Examples
Framework Modularity Services
Symfony 2 Bundles +
Yii 2 Extensions components
Laravel Packages +
Zend...

Components: Problems
◎ Decomposition to modules
◎ Dependencies between modules
◎ Configuration

OOP
Can we use it here?

Module as object
Module is an object!
◎ bundle initialization = bundle constructor
◎ configuration = constructor parameter...

S.O.L.I.D.
Dependency Inversion Principle
Modules should not depend on each other
explicitly (in code). Use common interfa...

Dependency inversion
Module 1 Module 2Service Constructor
Interface
DI

Module, DIP and code
◎ Separate repository for interface
psr-3 (logging), psr-7 (http messaging)
◎ Separate repository for...

Module configuration
◎ Semantic configuration API
○ configuration is a part of module API
○ no global dependencies in modu...

Example: Symfony
# app/config/config.yml
services:
sms_sender:
class: HelloSmsSender
arguments:
- "localhost:1234" # gatew...

Example: Symfony (2)
<?php
namespace HelloSms;
interface SenderInterface {
public function send($number, $message);
}
Let’...

Example: Symfony (3)
<?php
namespace HelloBundleContact;
use HelloSmsSenderInterface;
class Manager {
//...
public functio...

Example: Symfony (4)
# app/config/config.yml
sms: # SmsBundle configuration
gateway: "localhost:1234"
hello: # HelloBundle...

Example: Laravel
<?php
namespace MyCompanySms;
use IlluminateSupportServiceProvider;
class SmsServiceProvider extends Serv...

Example: Laravel (2)
<?php
namespace MyCompanyContact;
use IlluminateSupportServiceProvider;
class ContactsServiceProvider...

Is there any specification for component models?
The OSGi specification describes a modular
system and a service platform ...

4.
Microservices
Separation of responsibilities

Microservice architecture
Balancer
Application 1
http://myapp.com/personal
Application 2
http://myapp.com/enterprise

Microservice dependencies
Rules are the same:
◎ depend on API instead of service itself
◎ use semver.org
○ Apache Thrift f...

Microservice configuration
Problem: change configuration
simultaneously for every service
Solution: use Consul (or similar...

5.
The end?
Uncovered problems

Advanced topics
◎ Affecting services lifecycle
◎ Dependencies of listeners/middleware
◎ Configuration origins and environm...

Thanks!
Any questions?

Credits
Special thanks to all the people who made and released
these awesome resources for free:
◎ Presentation template b...

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