Enhance `DatabaseManager` with logging, validation, and cleanup

- Added detailed logging for database initialization and connection handling.
- Implemented configuration validation and sanity checks during initialization.
- Introduced `close()` method to properly release database resources.
- Updated `MediaManagerApplication` to invoke `DatabaseManager.close()` on shutdown.
- Updated `.gitignore` to exclude sensitive configuration files while allowing example files.

.gitignore

@@ -44,3 +44,11 @@ config-local.properties
 pipes/
 *.log
 /.idea/
+
+ Configuration files with sensitive credentials
+# These files contain database passwords and API keys and should never be committed
+src/main/resources/config.properties
+src/main/resources/application.properties
+
+# Allow example configuration files to be committed
+!src/main/resources/*.properties.example

src/main/java/com/mediamanager/MediaManagerApplication.java

@@ -33,7 +33,9 @@ public class MediaManagerApplication {
             // Keep application running
             Runtime.getRuntime().addShutdownHook(new Thread(() -> {
                 logger.info("Shutting down MediaManager Core...");
-                // TODO: Cleanup resources
+                if (databaseManager != null) {
+                    databaseManager.close();
+                }
             }));
 
         } catch (Exception e) {

src/main/java/com/mediamanager/service/database/DatabaseManager.java

@@ -1,18 +1,28 @@
 package com.mediamanager.service.database;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
 import java.sql.Connection;
 import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
 import java.util.Properties;
 
 
 public class DatabaseManager {
     private final Properties configuration;
     private Connection connection;
+    private static final Logger logger = LogManager.getLogger(DatabaseManager.class);
     public DatabaseManager(Properties config) {
         this.configuration = config;
+        logger.debug("DatabaseManager created with configuration:");
 
     }
 
     public void init() throws Exception {
+        logger.info("Initializing database connection...");
+        validateConfiguration();
+
         String databaseType = configuration.getProperty("database.type");
         String databaseUrl = configuration.getProperty("database.url");
         String databaseUsername = configuration.getProperty("database.username");
@@ -22,11 +32,67 @@ public class DatabaseManager {
 
 
         String connectionString = String.format("jdbc:postgresql://%s:%s/%s", databaseUrl, databasePort, databaseName);
-        connection = DriverManager.getConnection(connectionString, databaseUsername, databasePassword);
+        logger.debug("Attempting to connect to: {}", connectionString);
+        try {
+            connection = DriverManager.getConnection(connectionString, databaseUsername, databasePassword);
+            logger.info("Database connection established successfully");
+
+            performSanityChecks();
+            logger.info("Database sanity checks passed successfully");
+
+
+        } catch (SQLException e) {
+            logger.error("Failed to connect to database", e);
+            throw new Exception("Database connection failed: " + e.getMessage(), e);
+        }
+
+
 
     }
+    private void performSanityChecks() throws SQLException {
+        logger.debug("Performing sanity checks...");
+        try (Statement stmt = connection.createStatement()) {
+            stmt.execute("SELECT 1");
+
+        }
+        String databaseProductName = connection.getMetaData().getDatabaseProductName();
+        String databaseProductVersion = connection.getMetaData().getDatabaseProductVersion();
+        logger.info("Connected to database: {} v{}", databaseProductName, databaseProductVersion);
+    }
+    private void validateConfiguration() throws Exception {
+        String[] requiredProperties = {
+                "database.url",
+                "database.username",
+                "database.password",
+                "database.port",
+                "database.name"
+        };
+
+        for (String property : requiredProperties) {
+            if (configuration.getProperty(property) == null ||
+                    configuration.getProperty(property).trim().isEmpty()) {
+                throw new Exception("Required database configuration missing: " + property);
+            }
+        }
+
+        logger.debug("Database configuration validated successfully");
+
+        }
+
+
+
     public Connection getConnection() {
         return connection;
     }
 
+    public void close() {
+        if (connection != null) {
+            try {
+                connection.close();
+                logger.info("Database connection closed successfully");
+            } catch (SQLException e) {
+                logger.error("Failed to close database connection", e);
+            }
+        }
+    }
 }

src/main/resources/config.properties.example

@@ -21,3 +21,4 @@ hibernate.format_sql=true
 ipc.pipe.name=mediamanager-pipe
 ipc.pipe.path=/tmp/mediamanager
 ipc.buffer.size=8192
+