El documento describe un código de base de datos complejo que calcula los rankings de puntuación de usuario por país y globalmente. El código contiene múltiples subconsultas anidadas que agrupan, clasifican y unen datos de puntuaciones de usuario para devolver los rankings de un usuario específico.

1. @rafaoe !
@JavierCane "
⛑ Aprende a convivir con el
monolito legacy
(o no)
Volumen II

2. Todo lo que veréis en esta
charla HA PASADO

3. Los hechos, nombres, y tips
son semi-REALES

4. En algunos tips
esta charla podría
HERIR SENSIBILIDADES

5. Compartimos
aprendizajes reales

6. La realidad y el legacy no
entienden de sensibilidades

7. @rafaoe @JavierCane

8. @rafaoe @JavierCane
$

9. Comencem

14. Ey, ey.
Hay código… pero no hay test

16. UserController.java
package com.codely.controller;
import com.codely.model.User;
import com.codely.repository.UserRepository;
import com.codely.service.CacheService;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Optional;
@RestController
@RequestMapping("/user")
public class UserController {
@GetMapping("/{id}")
public ResponseEntity<User> getUser(@PathVariable("id") Long id) {

17. UserController.java
@RequestMapping("/user")
public class UserController {
@GetMapping("/{id}")
public ResponseEntity<User> getUser(@PathVariable("id") Long id) {
CacheService cacheService = CacheService.getInstance();
String cacheKey = "user_" + id;
User user = cacheService.get(cacheKey, User.class);
if (user != null) {
return new ResponseEntity<>(user, HttpStatus.OK);
}
UserRepository userRepository = UserRepository.getInstance();
Optional<User> userOptional = userRepository.findById(id);
if (userOptional.isEmpty()) {
return new ResponseEntity<>(HttpStatus.NOT_FOUND);
}
user = userOptional.get();
cacheService.put(cacheKey, user);

18. @RequestMapping("/user")
public class UserController {
@GetMapping("/{id}")
public ResponseEntity<User> getUser(@PathVariable("id") Long id) {
CacheService cacheService = CacheService.getInstance();
String cacheKey = "user_" + id;
User user = cacheService.get(cacheKey, User.class);
if (user != null) {
return new ResponseEntity<>(user, HttpStatus.OK);
}
UserRepository userRepository = UserRepository.getInstance();
Optional<User> userOptional = userRepository.findById(id);
if (userOptional.isEmpty()) {
return new ResponseEntity<>(HttpStatus.NOT_FOUND);
}
user = userOptional.get();
cacheService.put(cacheKey, user);
%
%
UserController.java

19. Flujo de una petición
&
Infraestructura
Aplicación
Dominio

20. Flujo de una petición
&
Unit test Integration test
I
A
D
Repository
Controller UseCase
Service
Implementation
Acceptance test

21. Flujo de una petición
&
Repository
Controller UseCase
Service
Unit test Integration test
Implementation
I
A
D
Acceptance test
'
(
)

22. Flujo de una petición
&
Repository
Controller UseCase
Service
Unit test Integration test
Implementation
Acceptance test
I
A
D
*

23. Flujo de una petición
&
Repository
Controller UseCase
Service
Unit test Integration test
Implementation
Acceptance test
I
A
D
$

24. Aprendizajes
⏩
, No hay tests → Aceptación
⬇ Dump diario de la BD de prod
. Dump selectivo
/ Datos al vuelo

25. bit.ly/commitconf23

26. ⏩ Pasan 3 años

27. Primera tarea en lo nuevo

28. SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore

29. SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM score
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?

30. SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM score
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM score
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM score
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM score
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM score
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRank
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY t.country_id
ORDER BY t.highScore DESC) AS countryRank,
RANK() OVER (ORDER BY t.highScore DESC) AS globalRan
FROM (
SELECT
user_id,
country_id,
MAX(score) AS highScore
FROM (
SELECT
*
FROM (
SELECT
t.user_id,
t.country_id,
t.highScore,
RANK() OVER (PARTITION BY
ORDER BY t.highScore
RANK() OVER (ORDER BY t.h
FROM (
SELECT
user_id,
country_id,
MAX(score) AS hi
FROM score
WHERE topic_id = 101
GROUP BY user_id, co
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?
)
WHERE topic_id = 101
GROUP BY user_id, country_id
) AS t
) AS rt
WHERE
rt.user_id = ?

31. Flujo de una petición
&
Repository
Controller UseCase
Service
Unit test Integration test
Implementation
Acceptance test
I
A
D
*

32. Flujo de una petición
&
Repository
Controller UseCase
Service
Unit test Integration test
Implementation
Acceptance test
I
A
D

33. TopGamesRepository
interface TopGamesRepository {
public save(TopGame[] games): void;
public searchAll(): TopGame[];
}

34. Cómo hacer que sea un éxito
Ey, ey.
He gamificado la migración

36. MySqlRepository.php
abstract class MySqlRepository {
public function search($query, $tag) {
$taggedQuery = "/*"!999999 $tag */$ $query";
// ...
}
}

37. OtherSqlRepository.php
abstract class OtherSqlRepository {
public function search($query, $tag) {
$taggedQuery = "IF('$tag' = '', 1, 0) AS tagged $query";
// ...
}
}

38. ⏩ Pasan 10 años

39. 0
1
Evolución tamaño instancias EC2
2
r6a.metal
r6a.48xlarge
r6a.48large
r6a.large r6a.xlarge
4
5
♻
7
8

40. Sincronización entre sistema legacy y el nuevo
♻
Legacy New
TubiAPIradora
legacy
domain_events
new
replicate_from_legacy
new
domain_events
legacy
replicate_from_new
Publica evento
Replica
Consume
Publica evento
Replica
Consume
Invoca API
9

41. ¿Fantasía en los nombres de proyecto?
☝
Sí No

42. TubiAPIradora vs CDC
☝
Change Data Capture Pattern
Consume
Trigger BD
TubiAPIradora
bit.ly/codely-eda

43. TubiAPIradora vs CDC
☝
Change Data Capture Pattern
Consume
Trigger BD
TubiAPIradora
bit.ly/codely-eda

44. Cómo hacer que sea un éxito

45. LegacyEventBus
public publish(array $event): void
{
Publisher.publish(
add(
$event,
['metadata' =>& ['from_legacy' =>& true]]
)
);
}

47. Aprende a convivir con el
monolito legacy (o no)

48. Aprende a convivir con el
monolito legacy

49. Resultados encuesta
¿Nombres fantasiosos para proyectos?
2
0
25
50
75
100
0
100
No Sí
bit.ly/hiring-codely
¡Muchas gracias!
Nos vemos en Codely