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Commit76ce920

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feat: Add practical real-world examples for Singleton, Builder, and Strategy patterns
Added comprehensive real-world examples with tests and documentation for threecommonly used design patterns in enterprise applications.## Singleton Pattern- ConfigurationManager: Application settings management- LoggerService: Centralized logging system- DatabaseConnectionPool: Connection pool management- Full test coverage for all implementations- Updated README with usage examples and Korean documentation## Builder Pattern- UserDTO: Complex user data transfer object- HttpRequest: HTTP request builder for API calls- EmailMessage: Email composition with attachments- Comprehensive tests for all builders- Enhanced README with practical use cases## Strategy Pattern- PaymentProcessor: Payment processing system- CreditCardPayment: Credit card payment strategy- BankTransferPayment: Bank transfer strategy- PayPalPayment: PayPal integration strategy- Complete test suite for payment strategies- Updated README with e-commerce payment exampleAll examples include:- Production-ready code with validation- Comprehensive JUnit 5 tests- Detailed Javadoc documentation- Korean and English README sections- Real-world use cases and best practices
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‎builder/README.md‎

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@@ -129,6 +129,111 @@ Use the Builder pattern when
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*[Apache Camel builders](https://github.com/apache/camel/tree/0e195428ee04531be27a0b659005e3aa8d159d23/camel-core/src/main/java/org/apache/camel/builder)
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*[Apache Commons Option.Builder](https://commons.apache.org/proper/commons-cli/apidocs/org/apache/commons/cli/Option.Builder.html)
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##실무 예제 (Practical Examples)
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###1. UserDTO - 사용자 정보 DTO
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API 요청/응답에서 사용되는 복잡한 사용자 정보 객체를 Builder 패턴으로 구성합니다.
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```java
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UserDTO user=UserDTO.builder()
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.id(1L)
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.username("john.doe")
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.email("john@example.com")
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.firstName("John")
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.lastName("Doe")
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.age(30)
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.phoneNumber("010-1234-5678")
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.address("123 Main St, Seoul")
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.addRole("USER")
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.addRole("ADMIN")
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.active(true)
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.build();
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System.out.println(user.getFullName());// "John Doe"
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System.out.println(user.hasRole("ADMIN"));// true
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```
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**실무 활용:**
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- API 요청/응답 DTO 생성
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- 데이터베이스 엔티티에서 DTO로 변환
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- 테스트 데이터 생성
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- 복잡한 사용자 프로필 구성
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###2. HttpRequest - HTTP 요청 빌더
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REST API 호출을 위한 HTTP 요청을 체계적으로 구성합니다.
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```java
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HttpRequest request=HttpRequest.builder()
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.post()
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.url("https://api.example.com/users")
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.addHeader("Content-Type","application/json")
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.addHeader("Authorization","Bearer token123")
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.addQueryParam("page","1")
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.addQueryParam("size","10")
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.jsonBody("{\"name\":\"John Doe\"}")
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.timeout(5000)
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.build();
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String response= request.execute();
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```
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**실무 활용:**
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- REST API 클라이언트 구현
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- HTTP 라이브러리 래퍼
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- 마이크로서비스 간 통신
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- 테스트용 HTTP 요청 생성
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###3. EmailMessage - 이메일 메시지 빌더
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복잡한 이메일 메시지를 단계적으로 구성합니다.
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```java
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EmailMessage email=EmailMessage.builder()
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.from("sender@example.com")
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.to("recipient@example.com")
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.addCc("manager@example.com")
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.addBcc("admin@example.com")
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.subject("Welcome to our service!")
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.body("<h1>Welcome!</h1><p>Thank you for joining us.</p>")
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.html(true)
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.priority(Priority.HIGH)
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.addAttachment("/path/to/document.pdf")
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.build();
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boolean sent= email.send();
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System.out.println("Total recipients:"+ email.getTotalRecipientCount());
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```
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**실무 활용:**
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- 이메일 발송 시스템
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- 알림 서비스
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- 마케팅 이메일 생성
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- 시스템 알림 메일
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##Builder 패턴의 실무 장점
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1.**가독성**: 복잡한 객체 생성 과정을 명확하게 표현
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2.**유연성**: 선택적 파라미터를 쉽게 처리
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3.**불변성**: Immutable 객체 생성으로 Thread-safe 보장
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4.**유효성 검증**: build() 메서드에서 일괄 유효성 검증
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5.**유지보수성**: 새로운 속성 추가가 용이
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##테스트 실행
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각 실무 예제에는 comprehensive한 테스트 코드가 포함되어 있습니다:
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```bash
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# 모든 테스트 실행
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mvntest
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# 특정 테스트만 실행
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mvntest -Dtest=UserDTOTest
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mvntest -Dtest=HttpRequestTest
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mvntest -Dtest=EmailMessageTest
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```
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##Credits
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*[Design Patterns: Elements of Reusable Object-Oriented Software](http://www.amazon.com/Design-Patterns-Elements-Reusable-Object-Oriented/dp/0201633612)

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