Library system

Author: EurusDevSec

JavaOOP/Exercises/Advanced/EnterpriseFramework/README.md

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+# Bài tập: Enterprise Application Framework
+
+## Mục tiêu:
+
+Xây dựng framework cho enterprise applications với focus vào scalability và maintainability
+
+## Yêu cầu chi tiết:
+
+### 1. Abstract Class: BaseEntity
+
+- Fields: `id` (UUID), `createdAt`, `updatedAt`, `version` (for optimistic locking)
+- Method: `updateTimestamp()`
+- Method: `incrementVersion()`
+- Abstract method: `validate()`
+- Implement equals(), hashCode() based trên id
+
+### 2. Interface: Repository<T extends BaseEntity>
+
+- Method: `save(T entity)`
+- Method: `findById(UUID id)`
+- Method: `findAll()`
+- Method: `delete(UUID id)`
+- Method: `existsById(UUID id)`
+- Method: `findByCriteria(SearchCriteria criteria)`
+
+### 3. Interface: Service<T extends BaseEntity>
+
+- Method: `create(T entity)`
+- Method: `update(UUID id, T entity)`
+- Method: `delete(UUID id)`
+- Method: `findById(UUID id)`
+- Method: `findAll(PageRequest pageRequest)`
+
+### 4. Interface: Cacheable
+
+- Method: `getCacheKey()`
+- Method: `getCacheTTL()` - Time To Live in seconds
+- Method: `shouldCache()`
+- Method: `evictCache()`
+
+### 5. Interface: Auditable
+
+- Method: `getAuditInfo()`
+- Method: `recordOperation(AuditOperation operation, String userId)`
+- Method: `getAuditHistory()`
+
+### 6. Core Entity Classes:
+
+#### User extends BaseEntity implements Auditable
+
+- Fields: `username`, `email`, `passwordHash`, `roles`, `isActive`
+- Fields: `lastLoginAt`, `failedLoginAttempts`, `accountLockedUntil`
+- Method: `authenticate(String password)`
+- Method: `assignRole(Role role)`
+- Method: `hasPermission(Permission permission)`
+- Method: `lockAccount(Duration lockDuration)`
+
+#### Role extends BaseEntity
+
+- Fields: `name`, `description`, `permissions`
+- Method: `addPermission(Permission permission)`
+- Method: `removePermission(Permission permission)`
+- Method: `hasPermission(Permission permission)`
+
+#### Permission extends BaseEntity
+
+- Fields: `name`, `resource`, `action` (CREATE, READ, UPDATE, DELETE)
+- Method: `matches(String resource, String action)`
+
+### 7. Service Layer Implementation:
+
+#### UserService extends BaseService<User> implements Cacheable
+
+- Method: `authenticateUser(String username, String password)`
+- Method: `registerUser(UserRegistrationRequest request)`
+- Method: `changePassword(UUID userId, String oldPassword, String newPassword)`
+- Method: `resetPassword(String email)`
+- Method: `searchUsers(UserSearchCriteria criteria)`
+- Implement caching cho frequently accessed users
+
+#### RoleService extends BaseService<Role>
+
+- Method: `createRoleWithPermissions(String roleName, List<Permission> permissions)`
+- Method: `assignRoleToUser(UUID userId, UUID roleId)`
+- Method: `getRolesByUser(UUID userId)`
+- Method: `updateRolePermissions(UUID roleId, List<Permission> permissions)`
+
+### 8. Abstract Class: BaseService<T extends BaseEntity>
+
+- Fields: `repository`, `cacheManager`, `auditService`, `validator`
+- Implement common CRUD operations
+- Method: `validateBeforeSave(T entity)`
+- Method: `performAudit(T entity, AuditOperation operation)`
+- Template method pattern cho save operations
+
+### 9. Design Patterns Implementation:
+
+#### Strategy Pattern: ValidationStrategy
+
+```java
+public interface ValidationStrategy<T> {
+    ValidationResult validate(T entity);
+}
+
+public class UserValidationStrategy implements ValidationStrategy<User>
+public class EmailValidationStrategy implements ValidationStrategy<String>
+public class PasswordValidationStrategy implements ValidationStrategy<String>
+```
+
+#### Decorator Pattern: ServiceDecorator
+
+```java
+public abstract class ServiceDecorator<T> implements Service<T>
+public class CachingServiceDecorator<T> extends ServiceDecorator<T>
+public class AuditingServiceDecorator<T> extends ServiceDecorator<T>
+public class ValidationServiceDecorator<T> extends ServiceDecorator<T>
+```
+
+#### Builder Pattern: QueryBuilder
+
+```java
+public class QueryBuilder {
+    public QueryBuilder select(String... fields)
+    public QueryBuilder from(String table)
+    public QueryBuilder where(String condition)
+    public QueryBuilder orderBy(String field, SortDirection direction)
+    public QueryBuilder limit(int count)
+    public Query build()
+}
+```
+
+### 10. Exception Handling Framework:
+
+#### Custom Exception Hierarchy:
+
+```java
+public class BusinessException extends Exception
+public class ValidationException extends BusinessException
+public class EntityNotFoundException extends BusinessException
+public class DuplicateEntityException extends BusinessException
+public class InsufficientPermissionException extends BusinessException
+```
+
+#### Global Exception Handler:
+
+```java
+public class GlobalExceptionHandler {
+    public ErrorResponse handleValidationException(ValidationException ex)
+    public ErrorResponse handleEntityNotFoundException(EntityNotFoundException ex)
+    public ErrorResponse handleGenericException(Exception ex)
+}
+```
+
+### 11. Configuration Management:
+
+#### Interface: ConfigurationProvider
+
+- Method: `getProperty(String key, Class<T> type)`
+- Method: `getProperty(String key, T defaultValue)`
+- Method: `getAllProperties()`
+- Method: `reloadConfiguration()`
+
+#### Classes:
+
+- `DatabaseConfigurationProvider` - load từ database
+- `FileConfigurationProvider` - load từ properties files
+- `EnvironmentConfigurationProvider` - load từ environment variables
+
+### 12. Event-Driven Architecture:
+
+#### Interface: Event
+
+- Method: `getEventType()`
+- Method: `getTimestamp()`
+- Method: `getPayload()`
+
+#### Interface: EventListener<T extends Event>
+
+- Method: `handle(T event)`
+- Method: `canHandle(Event event)`
+
+#### Class: EventBus (Singleton)
+
+- Method: `publish(Event event)`
+- Method: `subscribe(EventListener<?> listener)`
+- Method: `unsubscribe(EventListener<?> listener)`
+- Async event processing với thread pool
+
+### 13. Security Framework:
+
+#### Interface: SecurityContext
+
+- Method: `getCurrentUser()`
+- Method: `hasRole(String roleName)`
+- Method: `hasPermission(String resource, String action)`
+- Method: `authenticate(Credentials credentials)`
+
+#### Class: JWTTokenManager
+
+- Method: `generateToken(User user)`
+- Method: `validateToken(String token)`
+- Method: `extractClaims(String token)`
+- Method: `refreshToken(String refreshToken)`
+
+### 14. Monitoring và Metrics:
+
+#### Interface: MetricsCollector
+
+- Method: `incrementCounter(String name, Map<String, String> tags)`
+- Method: `recordTimer(String name, Duration duration)`
+- Method: `recordGauge(String name, double value)`
+
+#### Class: PerformanceMonitor
+
+- Method: `startTimer(String operationName)`
+- Method: `endTimer(String operationName)`
+- Method: `recordMethodExecution(String methodName, long executionTime)`
+- AOP integration cho automatic monitoring
+
+### 15. Advanced Features:
+
+#### Multi-tenancy Support:
+
+- Interface: TenantAware với getCurrentTenant()
+- TenantContext để manage tenant information
+- Data isolation strategies
+
+#### Internationalization:
+
+- MessageSource interface cho localized messages
+- ResourceBundleMessageSource implementation
+- Locale-aware error messages
+
+#### Data Transfer Objects:
+
+- Abstract class BaseDTO với mapping utilities
+- UserDTO, RoleDTO với proper validation annotations
+- Automatic mapping between entities và DTOs
+
+### 16. Testing Framework:
+
+- AbstractRepositoryTest với test database setup
+- AbstractServiceTest với mocking framework integration
+- Integration tests với TestContainers
+- Performance tests với JMH
+
+### 17. Documentation Requirements:
+
+- API documentation với detailed examples
+- Architecture diagrams
+- Configuration guide
+- Deployment instructions
+- Performance tuning guide
+
+## Technical Requirements:
+
+- Thread-safe implementations
+- Database transaction management
+- Connection pooling
+- Proper logging với structured formats
+- Health checks và metrics endpoints
+- Graceful shutdown handling
+
+## Đánh giá:
+
+- Architecture design (25%)
+- Security implementation (20%)
+- Performance optimization (20%)
+- Code quality và best practices (20%)
+- Documentation và testing (15%)