Using Your Design From Phase 1 To Apply Changes

Using Your Design From Phase 1 Db Apply Any Design Changes That You F

Using your design from Phase 1 DB, apply any design changes that you feel are needed and update your UML diagrams. Implement a client/server application in which a client communicates directly with a server. The server stores product and customer information in two separate files. The client application will allow a user to request product and customer information from the server. The server will retrieve and send the requested information to the client. The information will be displayed by the client in a user-friendly manner. It is suggested that your application use Swing components to support a user-friendly interface.

Paper For Above instruction

Introduction

The development of a reliable and efficient client-server architecture is fundamental for many modern applications that require dynamic data retrieval and display. This paper discusses the design, implementation, and evaluation of a Java-based client-server application that facilitates interaction with product and customer data stored in external files. The system employs a graphical user interface (GUI) built with Swing components, providing a user-friendly platform for users to request and view information seamlessly. Emphasis is placed on applying design modifications from initial diagrams, ensuring the architecture is robust and adaptable.

Design Overview and Modifications

The original design in Phase 1 included a basic client-server communication model, with data stored in flat files. Based on further analysis, several design enhancements are incorporated. These include refining the UML diagrams to better represent the classes, methods, and data flow, modeling clearer separation of concerns, and emphasizing security aspects such as file access rights. The server is designed to listen perpetually for client requests, process them efficiently, and manage file operations securely. The client interface is upgraded for better usability, allowing users to easily input requests and view responses in organized panels.

System Architecture and Communication Protocols

The architecture follows a typical socket-based communication paradigm. The server employs a `ServerSocket` listening on a specified port (e.g., 1234). Upon connection establishment, threads handle client requests to ensure concurrent processing. The client utilizes a `Socket` object to initiate a connection with the server, providing user inputs through Swing components such as `JTextField` and buttons. Communication involves the client sending request commands and parameters, with the server reading these requests, accessing the corresponding data files, and returning formatted information for display.

Implementation Details

The core components include:

- Client.java: Implements the GUI, manages user inputs, initiates server connections, and displays data.

- Server.java: Handles multiple client connections, processes requests, and manages file operations.

Client-side implementation:

- The GUI comprises input fields for customer and product details, and buttons labeled "Connect," "Customer Information," and "Product Information."

- On clicking "Connect," the client establishes a socket connection with the server.

- After connection, the user can request customer or product data by pressing respective buttons, which trigger the server interaction routines.

- Responses are parsed and rendered within the GUI, utilizing panels for readability.

Server-side implementation:

- The server creates a listening socket on port 1234.

- It maintains continuous operation, accepting client connections in a loop.

- For each connection, a dedicated thread handles requests—reading commands, accessing respective data files (`customerinfo.dat`, `productinfo.dat`), and sending formatted data back.

- It grants read-only rights to prevent unauthorized modifications.

File Operations and Data Handling:

- Data is stored in serialized formats or plain text, parsed into objects or strings.

- When a request for customer data is received, the server reads `customerinfo.dat` and sends the data.

- Similarly, product data requests result in reading `productinfo.dat`.

- The server ensures file access security, preventing write operations by clients.

Sample Code Snippets

Server-side pseudo code:

```java

ServerSocket ss = new ServerSocket(1234);

while (true) {

Socket s = ss.accept();

new Thread(() -> handleClient(s)).start();

}

void handleClient(Socket s) {

// Read request command

// Access appropriate data file

// Send data back to client

}

```

Client-side pseudo code:

```java

Socket s = new Socket("localhost", 1234);

// Send request command

// Read data from server

// Update GUI panels accordingly

```

User Interface Design

The GUI employs Java Swing components for enhanced interactivity and visual clarity:

- `JTextField` for user inputs.

- `JButton` for actions like connection and data requests.

- `JPanel` for displaying retrieved data.

- Error handling dialogs for connection issues or data retrieval errors.

Evaluation and Conclusion

The application demonstrates effective client-server communication with modular design, secure file handling, and an intuitive GUI. Design modifications from initial UML diagrams improved clarity and scalability, setting a foundation for future enhancements like adding database support or supporting multiple concurrent users. The use of Swing components facilitated a user-friendly interface compatible with various user requirements.

References

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