Submissão Teste - Caio Callegario

participantes/caio-callegario/README.md

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+# Submissão Teste Backend – Controle de Concorrência
+
+**Caio Callegario**
+
+Submissão feita com:
+
+- **Nginx** como load balancer  
+- **PostgreSQL** como banco de dados  
+- **Java 21 + Spring Boot** para a API  
+- **JDBC Template** para acesso ao banco  
+- **Docker Compose** para orquestração  
+
+**Repositório da API:**  
+https://github.com/callegariodev/backend-test

participantes/caio-callegario/docker-compose.yml

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+services:
+
+  api01: &api
+    image: callegariodev/sizebay-api:latest
+    hostname: api01
+
+    environment:
+      DB_HOST: db
+      DB_PORT: 5432
+      DB_NAME: sizebay-backend-challenge
+      DB_USERNAME: sizebay
+      DB_PASSWORD: backend-challenge
+
+      SPRING_DATASOURCE_HIKARI_MAXIMUM_POOL_SIZE: 15
+      SPRING_DATASOURCE_HIKARI_MINIMUM_IDLE: 5
+
+      SERVER_TOMCAT_MAX_THREADS: 150
+      SERVER_TOMCAT_ACCEPT_COUNT: 200
+
+      JAVA_TOOL_OPTIONS: >
+        -XX:+UseG1GC
+        -Xms128m
+        -Xmx128m
+        -XX:MaxMetaspaceSize=64m
+
+    depends_on:
+      - db
+
+    deploy:
+      resources:
+        limits:
+          cpus: "0.45"
+          memory: "150MB"
+
+
+  api02:
+    <<: *api
+    hostname: api02
+
+
+  nginx:
+    image: nginx:latest
+    hostname: lb
+
+    volumes:
+      - ./nginx.conf:/etc/nginx/nginx.conf:ro
+
+    depends_on:
+      - api01
+      - api02
+
+    ports:
+      - "9999:9999"
+
+    deploy:
+      resources:
+        limits:
+          cpus: "0.05"
+          memory: "10MB"
+
+
+  db:
+    image: postgres:16-alpine
+    hostname: db
+
+    environment:
+      POSTGRES_PASSWORD: backend-challenge
+      POSTGRES_USER: sizebay
+      POSTGRES_DB: sizebay-backend-challenge
+
+    volumes:
+      - ./postgres/init.sql:/docker-entrypoint-initdb.d/init.sql
+
+    command: >
+      postgres
+        -c max_connections=40
+        -c shared_buffers=64MB
+        -c effective_cache_size=128MB
+        -c work_mem=2MB
+        -c maintenance_work_mem=32MB
+        -c synchronous_commit=0
+        -c full_page_writes=0
+        -c max_wal_size=1024
+
+    deploy:
+      resources:
+        limits:
+          cpus: "0.45"
+          memory: "180MB"
+
+
+networks:
+  default:
+    driver: bridge

participantes/caio-callegario/nginx.conf

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+events {
+    worker_connections 1000;
+}
+
+http {
+    access_log off;
+    sendfile on;
+
+    upstream api {
+        server api01:8080;
+        server api02:8080;
+    }
+
+    server {
+        listen 9999;
+
+        location / {
+            proxy_pass http://api;
+        }
+    }
+}

participantes/caio-callegario/postgres/init.sql

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+CREATE TABLE accounts (
+    id SERIAL PRIMARY KEY,
+    credit_limit BIGINT NOT NULL,
+    balance BIGINT NOT NULL DEFAULT 0
+);
+
+CREATE TABLE transactions (
+    id SERIAL PRIMARY KEY,
+    account_id INT NOT NULL,
+    amount BIGINT NOT NULL,
+    type CHAR(1) NOT NULL,
+    description VARCHAR(10) NOT NULL,
+    occurred_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    CONSTRAINT fk_transactions_account 
+        FOREIGN KEY (account_id) REFERENCES accounts(id)
+);
+
+
+CREATE INDEX idx_transactions_account_id_occurred_at ON transactions (account_id, occurred_at DESC);
+
+
+INSERT INTO accounts (id, credit_limit, balance) VALUES
+(1, 100000, 0),
+(2, 80000, 0),
+(3, 1000000, 0),
+(4, 10000000, 0),
+(5, 500000, 0);
+
+SELECT setval('accounts_id_seq', (SELECT MAX(id) FROM accounts));