import java.io.File;
import java.io.IOException;
import java.util.Random;
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* This is just an example of how to use the provided client library. You are expected to customise this class and/or
* develop other client classes to test your Controller and Dstores thoroughly. You are not expected to include client
* code in your submission.
public class ClientMain {
public static void main(String[] args) throws Exception{
final int cport = Integer.parseInt(args[0]);
int timeout = Integer.parseInt(args[1]);
// this client expects a ‘downloads’ folder in the current directory; all files loaded from the store will be stored in this folder
File downloadFolder = new File(“downloads”);
if (!downloadFolder.exists())
if (!downloadFolder.mkdir()) throw new RuntimeException(“Cannot create download folder (folder absolute path: ” + downloadFolder.getAbsolutePath() + “)”);
// this client expects a ‘to_store’ folder in the current directory; all files to be stored in the store will be collected from this folder
File uploadFolder = new File(“to_store”);
if (!uploadFolder.exists())
throw new RuntimeException(“to_store folder does not exist”);
// launch a single client
testClient(cport, timeout, downloadFolder, uploadFolder);
// launch a number of concurrent clients, each doing the same operations
for (int i = 0; i < 10; i++) {
new Thread() {
public void run() {
test2Client(cport, timeout, downloadFolder, uploadFolder);
}.start();
public static void test2Client(int cport, int timeout, File downloadFolder, File uploadFolder) {
Client client = null;
client = new Client(cport, timeout, Logger.LoggingType.ON_FILE_AND_TERMINAL);
client.connect();
Random random = new Random(System.currentTimeMillis() * System.nanoTime());
File fileList[] = uploadFolder.listFiles();
for (int i=0; i
try { client.store(fileList[0]); } catch(IOException e) { e.printStackTrace(); }
try { client.store(fileList[0]); } catch(IOException e) { e.printStackTrace(); }
if (fileList.length > 1) {
try { client.store(fileList[1]); } catch(IOException e) { e.printStackTrace(); }
String list[] = null;
try { list = list(client); } catch(IOException e) { e.printStackTrace(); }
if (list != null)
for (String filename : list)
try { client.load(filename, downloadFolder); } catch(IOException e) { e.printStackTrace(); }
if (list != null)
for (String filename : list)
try { client.remove(filename); } catch(IOException e) { e.printStackTrace(); }
if (list != null && list.length > 0)
try { client.remove(list[0]); } catch(IOException e) { e.printStackTrace(); }
try { list(client); } catch(IOException e) { e.printStackTrace(); }
} finally {
if (client != null)
try { client.disconnect(); } catch(Exception e) { e.printStackTrace(); }
public static String[] list(Client client) throws IOException, NotEnoughDstoresException {
System.out.println(“Retrieving list of files…”);
String list[] = client.list();
System.out.println(“Ok, ” + list.length + ” files:”);
int i = 0;
for (String filename : list)
System.out.println(“[” + i++ + “] ” + filename);
return list;
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