CORBA-based-P2P-file-sharing-application

• This project includes two programs.
• One for CORBA File Share Register Server
• Another for CORBA File Share Client with Sockets.
• The two programs can be separated and work well.

Quick Start

A. Start FileRegisterServer on a computer.

• Waiting Maven auto-building completed.
• Choose Java 8 as the Project JDK.
• Installed MySQL and Workbench.
• Prepared a MySQL connection with hostname, port, username, and password.
• Place the values of the following three constants in DatabaseConnector.java to your MySQL connection setting.

private static final String URL = "jdbc:mysql://localhost:3306/";
private static final String USERNAME = "root";
private static final String PASSWORD = "MyNewPass";

• Then Run FileRegisterServer.java
• Note the server IP of the FileRegisterServer.

B. Start one or more FileShareClient on the same or other computers at the same local networks.

• Waiting Maven auto-building completed.
• Choose Java 8 as the Project JDK.
• Place the value of the constant in FileShareClient.java to your real CORBA server IP.

private static final String CORBA_SERVER_IP_ADDRESS = "198.18.0.1";

• Then run FileShareClient.java.
• Go to the root of your computer to find the shared and received files i.e.

Users/rocky/CORBA-based-P2P-file-sharing-application

• If you are facing problems, please read Setup Details for solutions.

Setup Details

A. Maven

• This project is using Maven for Dependency management!
• See dependencies in pom.xml

B. JDK

• Java 8 is the best choice because the CORBA module has been removed from Java 11 or later.
• Some JDK versions report errors.
• Java 8.0.392-amzn downloaded from SDKMan is working fine for me.

C. JDBC

1. JDBC Driver

• mysql-connector-java has already added to pom.xml. You can change the version.

2. Ensure MySQL and WorkBench installed on your computer.

3. Change the MySQL setting to your MySQL connection setting.

• Place the values of the following three constants in DatabaseConnector.java.

private static final String URL = "jdbc:mysql://localhost:3306/";
private static final String USERNAME = "root";
private static final String PASSWORD = "MyNewPass";

D. CORBA

1. Generate the stub and skeleton code (Already done)

• There is an idlj program that comes with the JDK for generating the stub and skeleton code in Java
• Use the following command to execute FileShare.idl

 idlj -fall src/main/java/FileShare.idl

2. Running the CORBA Server

• It has been added to the Java main method
• No need execution in Command Line
• No need adding argument in Run/Debug Configurations
• However, you need add your real CORBA server IP to FileShareClient.java

a) Start the ORB server

• FileShareClient.java

Runtime.getRuntime().exec("orbd -ORBInitialPort 1050 -ORBInitialHost localhost");

// Set the ORB properties programmatically
java.util.Properties props = new java.util.Properties();
props.put("org.omg.CORBA.ORBInitialPort", "1050");
props.put("org.omg.CORBA.ORBInitialHost", "localhost");
// create and initialize the ORB with the specified properties
ORB orb = ORB.init(args, props);

b) Get the ORB server

• Change to your real CORBA server IP in FileShareClient.java

private static final String CORBA_SERVER_IP_ADDRESS = "198.18.0.1";
System.out.printf("Get the file register server from %s:1050\n", CORBA_SERVER_IP_ADDRESS);
fileShare = CORBAConnector.getFileShareServer(CORBA_SERVER_IP_ADDRESS);

• Then following codes in CORBAConnector.java will work.

// Set the ORB properties programmatically
java.util.Properties props = new java.util.Properties();
props.put("org.omg.CORBA.ORBInitialPort", "1050");
props.put("org.omg.CORBA.ORBInitialHost", ip);
// create and initialize the ORB with the specified properties
ORB orb = ORB.init(new String[]{}, props);

E. Sockets

1. Server Socket

• Server socket thread will be running at the backend until you stop the client program.
• It can be connected by different IPs if you have more than one interfaces, such as Ethernet, Wi-Fi, VPN, Cellular.
• The client will ask you to choose the correct IP you will use in your local network to test.
• There will be a new child thread to interact with a new client socket.

2. Client Socket

• When request file sharing, a new client socket thread will be created and connect to the server socket.
• The program will continue until last client socket thread dead.