A peer-to-peer (P2P) shared photo album with a distributed directory written in Java. The implementation includes a distributed directory server pool, a P2P client and a P2P server.
The P2P client is responsible for order to obtain information about available files; it may also act as the client of a P2P transient server in order to obtain desired files.
The directory server pool is implemented as Distributed Hash Table (DHT) with IDs 1 to 4. Directory servers in DHT are connected in a ring using TCP connections and they have unique IP addresses. Communications between P2P client and DHT servers is done using UDP. Each server in the DHT pool also has unique UDP protocol port for communicating with P2P clients.
Step 1: Start Eclipse on a computer and create a workspace
Step 2: Go to File -> New -> Project.
Step 3: New window will pop up called New Project. Select Java Project, and then click Next.
Step 4: A new window will pop up named New Java Project. Name your project anything you wish. Pick version JavaSE-1.7, and then click Finish.
Step 5: You are now done. You should have a new project under Project Explorer, on the top-left side of the window.
Step 1: Copy DirectoryServer.java.
Step 2: Paste it into src folder under your project folder in Eclipse, and then double click it to open the file.
Step 3: Right click DirectoryServer.java, and go down to Properties.
Step 4: A new window pop up called Properties for DirectoryServer.java. Click Run/Debug Settings, and then click New.
Step 5: A new window will pop up called Select Configuration Type. Select Java Application and click Ok.
Step 6: A new window will pop up called Edit Configurations. Click Arguments.
The format for arguments on DirectoryServer.java is: ServerPort ServerID SuccessorServerPort SuccessorServerIP Example: 40340 1 40340 192.168.0.1
- In this example, the main port on this server is 40340, it is the first server on the DHT, it’s successor server’s (second server on the DHT) main port is 40340 and it’s successor server’s IP name is 192.168.0.1.
Step 7: Under Program arguments, type the argument. Then click Apply and then click OK. Now you will be back on Properties for DirectoryServer.java window, again click Apply and then click OK.
Step 8: Repeat Step 1-7 on three other computers, to get a total of 4 Directory Server’s. Remember, the successor server of Server 4 will be Server 1. This will ensure the DHT is connected in a ring system.
- After you are done, simply click the Run button on each computer, to start the servers. In the Console, you will see the program start.
Step 1: Copy both PeerClient.java and PeerServer.java.
Step 2: Paste them into src folder under your project folder in Eclipse, and then double click them to open the files.
Step 3: Right click PeerClient.java, and go down to Properties.
Step 4: A new window pop up called Properties for PeerClient.java. Click Run/Debug Settings, and then click New.
Step 5: A new window will pop up called Select Configuration Type. Select Java Application and click Ok.
Step 6: A new window will pop up called Edit Configurations. Click Arguments.
The format for arguments on PeerClient.java is: PeerServerPort ServerOneIP ServerOneMainPort Example: 40340 192.168.0.2 40340
- In this example, Peer Server will use port 40340 for other client to connect for file transfer. The last two arguments are first server on the DHT’s IP and its main port number.
Step 7: Under Program arguments, type the argument. Then click Apply and then click OK. Now you will be back on Properties for PeerClient.java window, again click Apply and then click OK.
Step 8: Repeat Step 1-7, for all other client that you wish to connect to the DHT.
First start your servers. After you are done, simply click the Run button on each computer to start the client. In the Console, you will see the program start.
Upload
A client chooses U, and then entered fig1. Corresponding hashed Directory Server has successfully added the content to its list.
Query
Client 1 chooses U, and then entered tree. Corresponding hashed Directory Server has successfully added the content to its list.
Client 2 chooses Q, then entered tree. We can see Directory Server’s message of content found. New connection created by Peer Server to service file exchange on a different socket. As well as GET message sent to Peer Server from retrieved IP using new socket and HTTP response message from Peer Server’s new socket. This client then chose to exit.
Exit
A client has uploaded multiple files. Then press E to exit. All contents uploaded are successfully removed.
