Pragmatic Monolith-First, easy to decompose, clean architecture

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Pragmatic Monolith-First
easy to decompose, clean architecture
Piotr Pelczar
Gliwice 2017, Spread IT

Let’s design a system
• Several different products
• Multi Channel

System Architecture - Case
Accounts DepositsLoans

System Architecture - Case
Product API
GUI
Channel 1
GUI
Channel 2
• Simple Split-Architecture (GUI + backend)

System Architecture - Case
Accounts DepositsLoans

Business makes money
and want to scale
• Cross-sell

System Architecture - Case
Accounts DepositsLoans

System Architecture - Case
Accounts Loans

System Architecture - Case

System Architecture - Solution 1
Accounts Loans
Event Bus
Loans’
• Event-Driven + data duplication

System Architecture - Solution 2
Accounts
Repo
Loans
Accounts
Sales Process
• Refactor – move functionality to another mod...

System Architecture - Solution 2
Accounts
Repo
Loans
Repo
Accounts
Sales Process
Loans
Sales Process
• And more refactor…

Business makes Cross-sell
and want to scale
• Sell next type of Loan

“We want the same process.”

“… almost the same process, but…”

System Architecture - Case
Accounts
Repo
Loans
Repo
Loans
Sales Process
Dep
#1
Dep
#2
Dep
#3

System Architecture - Solution 1
Accounts
Repo
Loans
Repo
Loans
Sales Process
Dep
#1
Dep
#2
Dep
#3
Dep
#4
Dep
#5
• if, if,...

System Architecture - Solution 2
Loans
Sales Process
Dep
#1
Dep
#2
Dep
#3
Dep
#4
Dep
#5
• Design new process and bring som...

Is it good decision?

Accounts Loans
…or this coupling is acceptable?
Can we assume that it is essential complexity
not accidental complexity?

Piotr Pelczar
Java, Groovy, node.js, PHP
11 yrs exp

We are making mistakes
Let’s prepare for them better

Microservices hype
We know benefits
We know drawbacks
One Bounded Context = 1 µS
Do we split properly? Do we understand Bu...

Why not Microservices at the beginning?
• YAGNI
• True: Hard to scale poor designed successful software
• But it is better...

https://zeroturnaround.com/rebellabs/developer-productivity-report-2017-why-do-you-use-java-tools-you-use/

Monolith-First Architecture
Manifest:
• Build well-managed complexity monolith
• Easy to refactor (move between packages)
...

Monolith-First Architecture
For:
• Long-living components (many projects)
• with Complex domain (no CRUD)

1. Well done high-level packaging

1. Well done high-level packaging
• Open the app folder
and can easily recognize what it is about

1. Well done high-level packaging
• Packaging by technical layer = Monoloth RIP
• More than one Bounded Context in each la...

1. Well done high-level packaging
Packaging by business scopes/Bounded Context = easy to split
com.acme.SERVICE-NAME.BOUND...

2. Know your domain

2. Know your domain
Modeling - DDD gives us tools:
• Tactical: (how to organize code)
• Aggregates, Value Objects, Reposit...

2. Know your domain

2. Know your domain
Event Storming – reveal domain by asking “what happened? when?”
Alberto Brandolini
https://techbeacon....

2. Know your domain - DDD
"Software development is a learning process;
working code is a side effect."
In monolith we can ...

3. Encapsulate the domain
(Clean Architecture and Usecases)

3. Encapsulate the domain
• On top-level packages expose what application do
• not how it is devlivered
• Use Case is Appl...

3. Clean architecture
https://8thlight.com/blog/uncle-bob/2011/11/22/Clean-Architecture.html

@Service
public class CreateScheduleUC {
@Transactional
public void createSchedule(CreateScheduleCommand command, CreateSc...

3. Clean architecture
https://8thlight.com/blog/uncle-bob/2011/11/22/Clean-Architecture.html

3. Clean architecture
https://8thlight.com/blog/uncle-bob/2011/11/22/Clean-Architecture.html

3. Clean architecture
https://8thlight.com/blog/uncle-bob/2011/11/22/Clean-Architecture.html

@Service
public class FindScheduleForDayUC {
@Data
@Builder
public static class ScheduleForDayCommand {
private final Stri...

@Controller
@RequestMapping("/schedule")
class FindScheduleForDayController {
@GetMapping(value = "/forDay/{programmeId}/{...

3. Clean architecture
UI
Business Logic
DAO I/O …
Business Logic
Domain
GUI DAO I/O

3. Clean architecture
https://8thlight.com/blog/uncle-bob/2011/11/22/Clean-Architecture.html

4. Make gaps in domain
Port and Adapters
aka Hexagonal Architecture

4. Make gaps in domain
• Ports (red)
• Adapters (blue)
• Out
• In
• I like “delivery” instead of
“in adapters”
http://www....

4. Make gaps in domain
• Separates domain from dependencies
• Database
• Another Bounded Context
• Domain Services can map...

5. Integrate Bounded Contexts

5. Integrate Bounded Contexts
• Integrate via
Ports -> Adapters ->
referring to Usecases
• Almost Microservices!
http://ww...

But we live in monolith…
and easy to make some unwanted
dependencies

6. Manage Complexity

6. Manage Complexity
http://www.structure101.com/

6. Manage Complexity

6. Manage Complexity
• Structure 101
• Java
• PHP
• Socomo Maven Plugin
• Java
• Another tools?

# prevent cyclic dependencies
check acyclicCompositionOf com.acme.someservice
[usecase] = com.acme.someservice.*.usecase.*...

7. You are ready to peel-off edges

7. Peel-off edges
1. Move whole package to another service
• add delivery layer only
2. Change Use Cases invocations in Ad...

7. Peel-off edges
public class AuthorFromUserService implements AuthorProvider {
public Author getAuthor(String nickname) ...

7. Peel-off edges
public class AuthorFromUserService implements AuthorProvider {
interface UserService {
@RequestLine("GET...

Monolith-First Architecture
1. Well done packaging
2. Know your domain (strategic and tactic DDD)
3. Encapsulate the domai...

We are making mistakes
Let’s prepare for them better

Monolith-First Architecture
For:
• Long-living components (many projects)
• when is a good time to peel-off?
• with Comple...

Monolith-First Architecture
• Many buzzwords?
These patterns already exists
there name is “interfaces”
here they are struc...

Thanks! Q&A
http://doineedbackup.com/customer-acquisition-channels-for-saas/

https://highspark.co/how-to-end-a-presentation/
Thanks! Q&A

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