package proxy;

/**
 * Real Subject — the actual, expensive database connection.
 * Opening it takes time. We want to delay this until truly needed.
 */
public class RealDatabaseConnection implements DatabaseConnection {

    private final String url;

    public RealDatabaseConnection(String url) {
        this.url = url;
    }

    @Override
    public void connect() {
        System.out.println("[Real DB] Connecting to " + url + " (expensive operation)...");
        // Simulate connection setup time
        try { Thread.sleep(100); } catch (InterruptedException e) { Thread.currentThread().interrupt(); }
        System.out.println("[Real DB] Connected.");
    }

    @Override
    public String executeQuery(String sql) {
        System.out.println("[Real DB] Executing: " + sql);
        return "ResultSet{rows=42}";  // simulated result
    }

    @Override
    public void disconnect() {
        System.out.println("[Real DB] Disconnecting from " + url);
    }
}