Finished all tasks from checklish.md

.gitignore

@@ -1,3 +1,4 @@
 .idea/*
 *.iml
 target/*
+*.log

logback.xml

@@ -0,0 +1,45 @@
+<configuration>
+    <appender name="ROLLING_FILE"
+              class="ch.qos.logback.core.rolling.RollingFileAppender">
+
+
+        <file>logs/app.log</file>
+
+        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
+            <fileNamePattern>logs/archive/app-%d{yyyy-MM-dd}.log.zip</fileNamePattern>
+            <maxHistory>30</maxHistory>
+            <totalSizeCap>6GB</totalSizeCap>
+        </rollingPolicy>
+
+        <encoder>
+            <pattern>%d{yyyy-MM-dd HH:mm:ss} [%thread] [User: %X{user_id}] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <appender name="ERROR_FILE"
+              class="ch.qos.logback.core.rolling.RollingFileAppender">
+        <file>logs/error.log</file>
+
+        <filter class="ch.qos.logback.classic.filter.LevelFilter">
+            <level>ERROR</level>
+            <onMatch>ACCEPT</onMatch>
+            <onMismatch>DENY</onMismatch>
+        </filter>
+
+        <rollingPolicy
+                class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
+            <fileNamePattern>logs/archive/errors-%d{yyyy-MM-dd}.log.zip</fileNamePattern>
+            <maxHistory>30</maxHistory>
+            <totalSizeCap>10GB</totalSizeCap>
+        </rollingPolicy>
+
+        <encoder>
+            <pattern>%d{yyyy-MM-dd HH:mm:ss} [%thread] [User: %X{user_id}] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="ROLLING_FILE" />
+        <appender-ref ref="ERROR_FILE" />
+    </root>
+</configuration>

pom.xml

@@ -24,6 +24,20 @@
             <version>4.12</version>
             <scope>test</scope>
         </dependency>
+        <!-- Source: https://mvnrepository.com/artifact/ch.qos.logback/logback-classic -->
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+            <version>1.5.33</version>
+            <scope>compile</scope>
+        </dependency>
+        <!-- Source: https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>2.0.17</version>
+            <scope>compile</scope>
+        </dependency>
     </dependencies>
     <build>
         <plugins>

src/main/java/mate/academy/Main.java

@@ -6,15 +6,20 @@
 import mate.academy.service.AuthenticationServiceImpl;
 import mate.academy.service.OrderService;
 import mate.academy.service.OrderServiceImpl;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class Main {
+    private static final Logger logger =
+            LoggerFactory.getLogger(Main.class);
+
     public static void main(String[] args) {
         AuthenticationService authenticationService = new AuthenticationServiceImpl();
         User user;
         try {
             user = authenticationService.login("bob", "1234");
         } catch (AuthenticationException e) {
-            e.printStackTrace();
+            logger.error("Authentication failed for user: bob", e);
             return;
         }
         OrderService orderService = new OrderServiceImpl();

src/main/java/mate/academy/service/AuthenticationServiceImpl.java

@@ -2,11 +2,16 @@
 
 import mate.academy.exception.AuthenticationException;
 import mate.academy.model.User;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class AuthenticationServiceImpl implements AuthenticationService {
+    private static final Logger logger =
+            LoggerFactory.getLogger(AuthenticationServiceImpl.class);
+
     @Override
     public User login(String login, String password) throws AuthenticationException {
-        //TODO: add corresponding log message about method login was called
+        logger.info("Method login was called. Params: login={}", login);
         User user = findByLogin(login);
         if (!user.getPassword().equals(password)) {
             throw new AuthenticationException("Username or password are incorrect");

src/main/java/mate/academy/service/OrderServiceImpl.java

@@ -4,11 +4,16 @@
 import java.util.List;
 import mate.academy.model.Order;
 import mate.academy.model.Product;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class OrderServiceImpl implements OrderService {
+    private static final Logger logger =
+            LoggerFactory.getLogger(OrderServiceImpl.class);
+
     @Override
     public Order completeOrder(Long userId) {
-        // TODO: add log message about method completeOrder was called
+        logger.info("Method completeOrder was called with {}", userId);
         List<Product> products = getAllProductsFromShoppingCart(userId);
         Order order = new Order(products, userId);
         // NOTE: In production ready code this order identifier should be generated by DB
@@ -24,7 +29,7 @@ private List<Product> getAllProductsFromShoppingCart(Long userId) {
         Product macBook = new Product("MacBook Air 2020", BigDecimal.valueOf(1399));
         Product xiaomi = new Product("Xiaomi 12", BigDecimal.valueOf(499));
         List<Product> products = List.of(iphone, macBook, xiaomi);
-        // TODO: add log message about successful fetched data from DB
+        logger.info("Successfully fetched data from DB");
         return products;
     }
 }