Merge branch 'servs-multiples' of flavien/Projet_JAVA_P2P_STRI2A into master

src/clientP2P/ClientDownloadPartTCP.java

@@ -0,0 +1,317 @@
+package clientP2P;
+import java.util.List;
+import java.util.ArrayList;
+import java.net.Socket;
+import protocolP2P.ProtocolP2PPacketTCP;
+import protocolP2P.Payload;
+import protocolP2P.LoadRequest;
+import protocolP2P.FilePart;
+import exception.InternalError;
+import remoteException.EmptyDirectory;
+import remoteException.EmptyFile;
+import exception.ProtocolError;
+import remoteException.InternalRemoteError;
+import remoteException.VersionRemoteError;
+import exception.TransmissionError;
+import remoteException.ProtocolRemoteError;
+import exception.VersionError;
+import exception.SizeError;
+import remoteException.NotFound;
+import java.nio.file.Files;
+import java.io.File;
+import java.nio.file.Paths;
+import java.io.IOException;
+import exception.SocketClosed;
+
+/** Class to download file parts on tcp.
+* @author	Louis Royer
+* @author	Flavien Haas
+* @author	JS Auge
+* @version	1.0
+*/
+public class ClientDownloadPartTCP implements Runnable {
+
+	private List<Long> toDoTasks;
+	private List<Long> pendingTasks;
+	private List<Long> tasksDone;
+	private volatile boolean tasksListsLock;
+	private volatile boolean stop;
+	private volatile boolean failed;
+	private String filename;
+	private Socket socket;
+	private volatile boolean noTask;
+	private String partsSubdir;
+	private static final long MAX_PARTIAL_SIZE = 4096;
+	private ClientDownloadTCP manager;
+
+	/** Constructor with filename, socket, and part subdir
+	 * @param filename	name of file to download
+	 * @param socket	socket to use
+	 * @param partsSubdir	directory to store .part files
+	 */
+	public ClientDownloadPartTCP(ClientDownloadTCP manager, String filename, Socket socket, String partsSubdir) {
+		this.manager = manager;
+		this.partsSubdir = partsSubdir;
+		this.filename = filename;
+		this.socket = socket;
+		stop = false;
+		failed = false;
+		pendingTasks = new ArrayList<>();
+		toDoTasks = new ArrayList<>();
+		tasksDone = new ArrayList<>();
+		noTask = true;
+		tasksListsLock = false;
+	}
+
+	/** True if thread has failed to get a file.
+	 * @return	true if thread has failed to get a file
+	 */
+	public boolean hasFailed() {
+		return failed;
+	}
+
+	/** Asks to stop thread.
+	 * @throws	InterruptedException
+	 */
+	public synchronized void setStop() throws InterruptedException {
+		stop = true;
+		this.notifyAll();
+	}
+
+	/** Runnable implementation */
+	public void run() {
+		while(!stop) {
+			try {
+				doTasks();
+				synchronized(manager) {
+					manager.notify();
+				}
+			} catch(InterruptedException e) {
+				try {
+					setStop();
+					synchronized(manager) {
+						manager.notify();
+					}
+				} catch (InterruptedException e2) {
+				}
+			}
+		}
+		System.err.println("Closing socket");
+		try{
+			socket.close();
+		} catch(IOException e){
+			System.err.println("can't close socket");
+		}
+	}
+
+	/** Get list of offsets that have not be downloaded if failed, else
+	 * empty list.
+	 * @return list of offsets
+	 */
+	public List<Long> getFailed() {
+		List<Long> ret = new ArrayList<>();
+		if (failed) {
+			ret.addAll(pendingTasks);
+			ret.addAll(toDoTasks);
+		}
+		return ret;
+	}
+
+	/** Get list of downloaded file parts offset, then clear this list.
+	 * @return	list of offsets
+	 * @throws	InterruptedException
+	 */
+	public List<Long> getDone() throws InterruptedException {
+		if (tasksDone.size() == 0) {
+			return new ArrayList<>();
+		} else {
+			synchronized (this) {
+				while(tasksListsLock) {
+					this.wait();
+				}
+				tasksListsLock = true;
+				List<Long> ret = new ArrayList<>(tasksDone);
+				tasksDone.clear();
+				tasksListsLock = false;
+				this.notifyAll();
+				return ret;
+			}
+		}
+	}
+
+	/** Adds offset of files parts to download.
+	 * @param task	offset to download
+	 * @throws	InterruptedException
+	 */
+	public synchronized void assignTask(Long task) throws InterruptedException {
+		synchronized(this) {
+			while(tasksListsLock) {
+				this.wait();
+			}
+			tasksListsLock = true;
+			toDoTasks.add(task);
+			noTask = false;
+			tasksListsLock = false;
+			this.notifyAll();
+		}
+	}
+
+	/** Send one request and wait for one response. Blocks when no task.
+	 * @throws InterruptedException
+	 */
+	public synchronized void doTasks() throws InterruptedException {
+		while(noTask && !stop) {
+			this.wait();
+		}
+		if (!stop) {
+			try {
+				Long offset = toDoTasks.get(0);
+				ProtocolP2PPacketTCP p = reqPart(offset);
+				if (p == null) {
+					stop = true;
+				}
+
+				failed = downloadPart(p);
+				if (failed) {
+					System.err.println("Error: DownloadPart failed.");
+					stop = true;
+				} else if (toDoTasks.isEmpty()) {
+						noTask = true;
+				}
+			} catch (IndexOutOfBoundsException e) {
+				noTask = true;
+			}
+
+		}
+	}
+
+	public ProtocolP2PPacketTCP reqPart(Long offset) {
+		System.err.println("New request: "+ offset);
+		// maintain tracking of tasks
+		if (toDoTasks.contains(offset)) {
+			try {
+				synchronized (this) {
+					while(tasksListsLock) {
+						this.wait();
+					}
+					tasksListsLock = true;
+					toDoTasks.remove(offset);
+					pendingTasks.add(offset);
+					tasksListsLock = false;
+					this.notifyAll();
+				}
+			} catch(InterruptedException e) {
+				System.err.println("Error: reqPart interruptedException");
+				return null;
+			}
+		} else {
+			System.err.println("Error: reqPart (offset " + offset + " not in toDoTasks)");
+			return null;
+		}
+		// send request
+		try {
+			ProtocolP2PPacketTCP d = new ProtocolP2PPacketTCP((Payload) new LoadRequest(filename, offset.longValue(), MAX_PARTIAL_SIZE));
+			d.sendRequest((Object)socket);
+			return d;
+		} catch (InternalError e) {
+			System.err.println("Error: reqPart internalError");
+			return null;
+		} catch (IOException e) {
+			e.printStackTrace();
+			System.err.println("Error: reqPart ioexception");
+			return null;
+		} catch (SocketClosed e){
+			System.err.println("Error: reqPart SocketClosed");
+			return null;
+		}
+	}
+
+	public boolean downloadPart(ProtocolP2PPacketTCP d) {
+		if (d == null) {
+			System.err.println("Error: downloadPart -> d is null.");
+			return true;
+		}
+		try {
+			Payload p = d.receiveResponse().getPayload();
+			assert p instanceof FilePart : "This payload must be instance of FilePart";
+			if (!(p instanceof FilePart)) {
+				System.err.println("Error: cannot get size.");
+				return true;
+			} else {
+				FilePart fp = (FilePart)p;
+				if (!fp.getFilename().equals(filename)) {
+					System.err.println("Error: wrong file received: `" + fp.getFilename() + "`");
+					return true;
+				}
+				Long offset = Long.valueOf(fp.getOffset());
+				if (pendingTasks.contains(offset)) {
+					try {
+						Files.write(new File(partsSubdir + filename + "_" + offset + ".part").toPath(), fp.getPartialContent());
+					} catch (IOException e) {
+						System.err.println("Error: cannot write file (" + partsSubdir + filename + "_" + offset + ".part)");
+					}
+				} else {
+					System.err.println("Error: wrong file part received.");
+					return true;
+				}
+				try {
+					synchronized(this) {
+						while(tasksListsLock) {
+							this.wait();
+						}
+						tasksListsLock = true;
+						pendingTasks.remove(offset);
+						tasksDone.add(offset);
+						tasksListsLock = false;
+						this.notifyAll();
+					}
+				} catch(InterruptedException e) {
+					System.err.println("Error: DownloadPart Interrupted exception");
+					return true;
+				}
+			}
+		} catch (EmptyDirectory e) {
+			System.err.println("Error: empty directory.");
+			return true;
+		} catch (EmptyFile e) {
+			System.err.println("Error: downloadPart emptyFile");
+			// TODO: use more specific errors
+			return true;
+		} catch (ProtocolError e) {
+			System.err.println("Error: downloadPart protocolError");
+			return true;
+		} catch (InternalRemoteError e) {
+			System.err.println("Error: downloadPart internalRemoteError");
+			return true;
+		} catch (VersionRemoteError e) {
+			System.err.println("Error: downloadPart versionRemoteError");
+			return true;
+		} catch (ProtocolRemoteError e) {
+			System.err.println("Error: downloadPart protocolRemoteError");
+			return true;
+		} catch (TransmissionError e) {
+			System.err.println("Error: downloadPart transmissionError");
+			return true;
+		} catch (VersionError e) {
+			System.err.println("Error: downloadPart versionError");
+			return true;
+		} catch (SizeError e) {
+			System.err.println("Error: downloadPart sizeError");
+			return true;
+		} catch (NotFound e) {
+			System.err.println("Error: downloadPart notFound");
+			return true;
+		} catch (IOException e) {
+			System.err.println("Error: downloadPart ioexception");
+			return true;
+		} catch (InternalError e) {
+			System.err.println("Error: downloadPart internalError");
+			return true;
+		} catch (SocketClosed e){
+			System.err.println("Error: downloadPart SocketClosed");
+			return true;
+		}
+		return false;
+	}
+
+}

src/clientP2P/ClientDownloadPartUDP.java

@@ -0,0 +1,306 @@
+package clientP2P;
+import java.util.List;
+import java.util.ArrayList;
+import java.net.DatagramSocket;
+import protocolP2P.ProtocolP2PPacketUDP;
+import protocolP2P.Payload;
+import protocolP2P.LoadRequest;
+import protocolP2P.FilePart;
+import exception.InternalError;
+import remoteException.EmptyDirectory;
+import remoteException.EmptyFile;
+import exception.ProtocolError;
+import remoteException.InternalRemoteError;
+import remoteException.VersionRemoteError;
+import exception.TransmissionError;
+import remoteException.ProtocolRemoteError;
+import exception.VersionError;
+import exception.SizeError;
+import remoteException.NotFound;
+import java.nio.file.Files;
+import java.io.File;
+import java.nio.file.Paths;
+import java.io.IOException;
+
+/** Class to download file parts on udp.
+* @author	Louis Royer
+* @author	Flavien Haas
+* @author	JS Auge
+* @version	1.0
+*/
+public class ClientDownloadPartUDP implements Runnable {
+
+	private List<Long> toDoTasks;
+	private List<Long> pendingTasks;
+	private List<Long> tasksDone;
+	private volatile boolean tasksListsLock;
+	private volatile boolean stop;
+	private volatile boolean failed;
+	private String filename;
+	private DatagramSocket socket;
+	private volatile boolean noTask;
+	private String partsSubdir;
+	private static final long MAX_PARTIAL_SIZE = 4096;
+	private ClientDownloadUDP manager;
+
+	/** Constructor with filename, socket, and part subdir
+	 * @param filename	name of file to download
+	 * @param socket	socket to use
+	 * @param partsSubdir	directory to store .part files
+	 */
+	public ClientDownloadPartUDP(ClientDownloadUDP manager, String filename, DatagramSocket socket, String partsSubdir) {
+		this.manager = manager;
+		this.partsSubdir = partsSubdir;
+		this.filename = filename;
+		this.socket = socket;
+		stop = false;
+		failed = false;
+		pendingTasks = new ArrayList<>();
+		toDoTasks = new ArrayList<>();
+		tasksDone = new ArrayList<>();
+		noTask = true;
+		tasksListsLock = false;
+	}
+
+	/** True if thread has failed to get a file.
+	 * @return	true if thread has failed to get a file
+	 */
+	public boolean hasFailed() {
+		return failed;
+	}
+
+	/** Asks to stop thread.
+	 * @throws	InterruptedException
+	 */
+	public synchronized void setStop() throws InterruptedException {
+		stop = true;
+		this.notifyAll();
+	}
+
+	/** Runnable implementation */
+	public void run() {
+		while(!stop) {
+			try {
+				doTasks();
+				synchronized(manager) {
+					manager.notify();
+				}
+			} catch(InterruptedException e) {
+				try {
+					setStop();
+					synchronized(manager) {
+						manager.notify();
+					}
+				} catch (InterruptedException e2) {
+				}
+			}
+		}
+		System.err.println("Closing socket");
+		socket.close();
+	}
+
+	/** Get list of offsets that have not be downloaded if failed, else
+	 * empty list.
+	 * @return list of offsets
+	 */
+	public List<Long> getFailed() {
+		List<Long> ret = new ArrayList<>();
+		if (failed) {
+			ret.addAll(pendingTasks);
+			ret.addAll(toDoTasks);
+		}
+		return ret;
+	}
+
+	/** Get list of downloaded file parts offset, then clear this list.
+	 * @return	list of offsets
+	 * @throws	InterruptedException
+	 */
+	public List<Long> getDone() throws InterruptedException {
+		if (tasksDone.size() == 0) {
+			return new ArrayList<>();
+		} else {
+			synchronized (this) {
+				while(tasksListsLock) {
+					this.wait();
+				}
+				tasksListsLock = true;
+				List<Long> ret = new ArrayList<>(tasksDone);
+				tasksDone.clear();
+				tasksListsLock = false;
+				this.notifyAll();
+				return ret;
+			}
+		}
+	}
+
+	/** Adds offset of files parts to download.
+	 * @param task	offset to download
+	 * @throws	InterruptedException
+	 */
+	public synchronized void assignTask(Long task) throws InterruptedException {
+		synchronized(this) {
+			while(tasksListsLock) {
+				this.wait();
+			}
+			tasksListsLock = true;
+			toDoTasks.add(task);
+			noTask = false;
+			tasksListsLock = false;
+			this.notifyAll();
+		}
+	}
+
+	/** Send one request and wait for one response. Blocks when no task.
+	 * @throws InterruptedException
+	 */
+	public synchronized void doTasks() throws InterruptedException {
+		while(noTask && !stop) {
+			this.wait();
+		}
+		if (!stop) {
+			try {
+				Long offset = toDoTasks.get(0);
+				ProtocolP2PPacketUDP p = reqPart(offset);
+				if (p == null) {
+					stop = true;
+				}
+				
+				failed = downloadPart(p);
+				if (failed) {
+					System.err.println("Error: DownloadPart failed.");
+					stop = true;
+				} else if (toDoTasks.isEmpty()) {
+						noTask = true;
+				}
+			} catch (IndexOutOfBoundsException e) {
+				noTask = true;
+			}
+			
+		}
+	}
+
+	public ProtocolP2PPacketUDP reqPart(Long offset) {
+		System.err.println("New request: "+ offset);
+		// maintain tracking of tasks
+		if (toDoTasks.contains(offset)) {
+			try {
+				synchronized (this) {
+					while(tasksListsLock) {
+						this.wait();
+					}
+					tasksListsLock = true;
+					toDoTasks.remove(offset);
+					pendingTasks.add(offset);
+					tasksListsLock = false;
+					this.notifyAll();
+				}
+			} catch(InterruptedException e) {
+				System.err.println("Error: reqPart interruptedException");
+				return null;
+			}
+		} else {
+			System.err.println("Error: reqPart (offset " + offset + " not in toDoTasks)");
+			return null;
+		}
+		// send request
+		try {
+			ProtocolP2PPacketUDP d = new ProtocolP2PPacketUDP((Payload) new LoadRequest(filename, offset.longValue(), MAX_PARTIAL_SIZE));
+			d.sendRequest((Object)socket);
+			return d;
+		} catch (InternalError e) {
+			System.err.println("Error: reqPart internalError");
+			return null;
+		} catch (IOException e) {
+			e.printStackTrace();
+			System.err.println("Error: reqPart ioexception");
+			return null;
+		}
+	}
+
+	public boolean downloadPart(ProtocolP2PPacketUDP d) {
+		if (d == null) {
+			System.err.println("Error: downloadPart -> d is null.");
+			return true;
+		}
+		try {
+			Payload p = d.receiveResponse().getPayload();
+			assert p instanceof FilePart : "This payload must be instance of FilePart";
+			if (!(p instanceof FilePart)) {
+				System.err.println("Error: cannot get size.");
+				return true;
+			} else {
+				FilePart fp = (FilePart)p;
+				if (!fp.getFilename().equals(filename)) {
+					System.err.println("Error: wrong file received: `" + fp.getFilename() + "`");
+					return true;
+				}
+				Long offset = Long.valueOf(fp.getOffset());
+				if (pendingTasks.contains(offset)) {
+					try {
+						Files.write(new File(partsSubdir + filename + "_" + offset + ".part").toPath(), fp.getPartialContent());
+					} catch (IOException e) {
+						System.err.println("Error: cannot write file (" + partsSubdir + filename + "_" + offset + ".part)");
+					}
+				} else {
+					System.err.println("Error: wrong file part received.");
+					return true;
+				}
+				try {
+					synchronized(this) {
+						while(tasksListsLock) {
+							this.wait();
+						}
+						tasksListsLock = true;
+						pendingTasks.remove(offset);
+						tasksDone.add(offset);
+						tasksListsLock = false;
+						this.notifyAll();
+					}
+				} catch(InterruptedException e) {
+					System.err.println("Error: DownloadPart Interrupted exception");
+					return true;
+				}
+			}
+		} catch (EmptyDirectory e) {
+			System.err.println("Error: empty directory.");
+			return true;
+		} catch (EmptyFile e) {
+			System.err.println("Error: downloadPart emptyFile");
+			// TODO: use more specific errors
+			return true;
+		} catch (ProtocolError e) {
+			System.err.println("Error: downloadPart protocolError");
+			return true;
+		} catch (InternalRemoteError e) {
+			System.err.println("Error: downloadPart internalRemoteError");
+			return true;
+		} catch (VersionRemoteError e) {
+			System.err.println("Error: downloadPart versionRemoteError");
+			return true;
+		} catch (ProtocolRemoteError e) {
+			System.err.println("Error: downloadPart protocolRemoteError");
+			return true;
+		} catch (TransmissionError e) {
+			System.err.println("Error: downloadPart transmissionError");
+			return true;
+		} catch (VersionError e) {
+			System.err.println("Error: downloadPart versionError");
+			return true;
+		} catch (SizeError e) {
+			System.err.println("Error: downloadPart sizeError");
+			return true;
+		} catch (NotFound e) {
+			System.err.println("Error: downloadPart notFound");
+			return true;
+		} catch (IOException e) {
+			System.err.println("Error: downloadPart ioexception");
+			return true;
+		} catch (InternalError e) {
+			System.err.println("Error: downloadPart internalError");
+			return true;
+		}
+		return false;
+	}
+
+}

src/clientP2P/ClientDownloadTCP.java

@@ -0,0 +1,386 @@
+package clientP2P;
+import clientP2P.ClientDownloadPartTCP;
+import tools.HostItem;
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Random;
+import remoteException.EmptyDirectory;
+import remoteException.EmptyFile;
+import remoteException.VersionRemoteError;
+import remoteException.ProtocolRemoteError;
+import remoteException.NotFound;
+import remoteException.InternalRemoteError;
+import protocolP2P.HashAlgorithm;
+import protocolP2P.HashResponse;
+import protocolP2P.HashRequest;
+import protocolP2P.ProtocolP2PPacketTCP;
+import protocolP2P.Payload;
+import exception.ProtocolError;
+import exception.InternalError;
+import exception.TransmissionError;
+import exception.SizeError;
+import exception.VersionError;
+import protocolP2P.FilePart;
+import protocolP2P.LoadRequest;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.io.File;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.nio.file.StandardCopyOption;
+import exception.SocketClosed;
+
+/** Class to download file from tcp
+* @author	Louis Royer
+* @author	Flavien Haas
+* @author	JS Auge
+* @version	1.0
+*/
+public class ClientDownloadTCP implements Runnable {
+
+	private List<HostItem> hostList;
+	private String filename;
+	private byte[] hash512;
+	private List<ClientDownloadPartTCP> sockList = new ArrayList<ClientDownloadPartTCP>();
+	private List<Long> offsetsToAsk = new ArrayList<Long>();
+	private List<Long> offsetsPending = new ArrayList<Long>();
+	private boolean stop;
+	private long size;
+	private static final long MAX_PARTIAL_SIZE = 4096;
+	private String partsSubdir;
+	private String dirStorage;
+	private boolean success = false;
+
+	/** Constructor with parameters: filename, list of hosts, parts subdirectory and dirStorage
+	 * @param filename	name of file to download
+	 * @param hostList	list of servers
+	 * @param partsSubdir	directory to store .part files
+	 * @param dirStorage	directory to write assembled file
+	 */
+	public ClientDownloadTCP(String filename, List<HostItem> hostList, String partsSubdir, String dirStorage) {
+		this.partsSubdir = partsSubdir;
+		this.dirStorage = dirStorage;
+		this.filename = filename;
+		this.hostList = hostList;
+		this.stop = false;
+	}
+
+	/** Asks thread to stop
+	 */
+	public void setStop() {
+		stop = true;
+	}
+
+	/** Runnable implementation
+	 */
+	public void run() {
+		try {
+			init();
+			if (stop) {
+				System.err.println("File is smaller than part max size.");
+				hostList.get(0).closeTCPSocket();
+			} else {
+				System.err.println("File is bigger than part max size.");
+				purgeList();
+				initThreads();
+				while(!stop) {
+					assignTasks();
+					checkTasksStatus();
+
+				}
+			}
+			System.err.println("Reassembling file parts.");
+			reassembleFile();
+		} catch(InternalError e) {
+			System.err.println("Error while downloading file. Aborting.");
+		} finally {
+			stopTasks();
+		}
+	}
+
+	/** Starts threads for each server in hostList.
+	 */
+	private void initThreads() {
+		for(HostItem hostItem: hostList) {
+			sockList.add(new ClientDownloadPartTCP(this, filename, hostItem.getTCPSocket(), partsSubdir));
+		}
+		for(ClientDownloadPartTCP c: sockList) {
+			Thread t = new Thread(c);
+			t.start();
+		}
+		System.err.println("Threads initialized");
+	}
+
+	/** Remove tasks from failed threads. Update done status.
+	 * @throws	InternalError
+	 */
+	private void checkTasksStatus() throws InternalError {
+		try {
+			synchronized(this) {
+				this.wait();
+				List<ClientDownloadPartTCP> sockListCpy = new ArrayList<>(sockList);
+				for(ClientDownloadPartTCP c: sockListCpy) {
+					if (c.hasFailed() == true) {
+						sockList.remove(c);
+						offsetsPending.removeAll(c.getFailed());
+						offsetsToAsk.addAll(c.getFailed());
+					}
+					try {
+						offsetsPending.removeAll(c.getDone());
+					} catch (InterruptedException e) {
+						throw new InternalError();
+					}
+				}
+				System.err.println("Task check status: " + offsetsToAsk.size() + " to asks, " + offsetsPending.size() + " pending");
+				if (offsetsToAsk.isEmpty() && offsetsPending.isEmpty()) {
+					stop = true;
+				}
+				if (sockList.size() == 0) {
+					System.err.println("No thread working");
+					throw new InternalError();
+				}
+			}
+		} catch (InterruptedException e) {
+			throw new InternalError();
+		}
+	}
+
+	/** Assign tasks randomly to threads.
+	 * @throws	InternalError
+	 */
+	private void assignTasks() throws InternalError {
+		Random rand = new Random();
+		for(long offset : offsetsToAsk) {
+			try {
+				sockList.get(rand.nextInt(sockList.size())).assignTask(offset);
+				offsetsPending.add(offset);
+				System.err.println("Assigned task "+ offset);
+			} catch(InterruptedException e) {
+				throw new InternalError();
+			}
+		}
+		offsetsToAsk.removeAll(offsetsPending);
+	}
+
+	/** Stop threads */
+	private void stopTasks() {
+		for(ClientDownloadPartTCP c : sockList) {
+			try {
+				c.setStop();
+			} catch (InterruptedException e) {}
+		}
+	}
+
+	/** Get hashsum from server.
+	 * @param hostItem	server to ask hash
+	 * @return	hash512sum
+	 * @throws	InternalError
+	 */
+	private byte[] getHashSum512(HostItem hostItem) throws InternalError {
+		byte[] hash;
+		HashAlgorithm[] hashesAlgo = new HashAlgorithm[1];
+		hashesAlgo[0] = HashAlgorithm.SHA512;
+		ProtocolP2PPacketTCP d = new ProtocolP2PPacketTCP((Payload) new HashRequest(filename, hashesAlgo));
+		try {
+			d.sendRequest((Object)hostItem.getTCPSocket());
+			try {
+				Payload pHash = d.receiveResponse().getPayload();
+				assert pHash instanceof HashResponse : "This payload must be instance of HashResponse";
+				if (!(pHash instanceof HashResponse)) {
+					throw new InternalError();
+				} else {
+					hash = ((HashResponse)pHash).getHash(HashAlgorithm.SHA512);
+				}
+			} catch (EmptyDirectory e) {
+				hash = new byte[0];
+			} catch (NotFound e) {
+				hash = new byte[0];
+				// TODO: use more specific errors
+			} catch (EmptyFile e) {
+				throw new InternalError();
+			} catch (ProtocolError e) {
+				throw new InternalError();
+			} catch (InternalRemoteError e) {
+				throw new InternalError();
+			} catch (VersionRemoteError e) {
+				throw new InternalError();
+			} catch (ProtocolRemoteError e) {
+				throw new InternalError();
+			} catch (TransmissionError e) {
+				throw new InternalError();
+			} catch (VersionError e) {
+				throw new InternalError();
+			} catch (SizeError e) {
+				throw new InternalError();
+			}
+			return hash;
+		} catch (IOException e) {
+			throw new InternalError();
+		} catch (SocketClosed e){
+			System.err.println("getHashSum512 : SocketClosed");
+			throw new InternalError();
+		}
+	}
+
+	/** Removes servers not owning the correct file to download from list.
+	 * This is done by comparing hash512sum.
+	 * @throws	InternalError
+	 */
+	private void purgeList() throws InternalError {
+		List<HostItem> blackList = new ArrayList<HostItem>();
+		boolean first = false;
+		byte[] hashsum;
+		for(HostItem host: hostList) {
+			// already have hashsum from 1st server
+			if (!first) {
+				first = true;
+				continue;
+			}
+			// ask hashsum
+			hashsum = getHashSum512(host);
+			if (!Arrays.equals(hash512, hashsum)) {
+				blackList.add(host);
+			}
+		}
+		// purge list
+		for(HostItem host: blackList) {
+			hostList.remove(host);
+		}
+		System.err.println("Host list purge: done");
+	}
+
+	/** Getter for hash512sum
+	 * @return	hash512sum
+	 */
+	public byte[] getHashSum512() {
+		return hash512;
+	}
+
+	/** Initialize infos about file to download (size, hash512sum, partslist to dl).
+	 * Also download first partfile (to get size).
+	 * @throws	InternalError
+	 */
+	private void init() throws InternalError {
+		// get size
+		setSize();
+
+		// get hashsum from 1st server in list
+		hash512 = getHashSum512(hostList.get(0));
+		if (hash512.length == 0) {
+			System.err.println("Error: no hash512sum support.");
+			throw new InternalError();
+		}
+
+		// Add tasks
+		if (!stop) {
+			for(long i=MAX_PARTIAL_SIZE; i<size;i+=MAX_PARTIAL_SIZE) {
+				offsetsToAsk.add(Long.valueOf(i));
+			}
+			System.err.println("Adding tasks: done");
+		}
+	}
+
+	/** Set size of file to download. Also download first file part.
+	 * @throws InternalError
+	 */
+	private void setSize() throws InternalError {
+		ProtocolP2PPacketTCP d = new ProtocolP2PPacketTCP((Payload) new LoadRequest(filename, 0, MAX_PARTIAL_SIZE));
+		try {
+			d.sendRequest((Object)hostList.get(0).getTCPSocket());
+			try {
+				Payload p = d.receiveResponse().getPayload();
+				assert p instanceof FilePart : "This payload must be instance of FilePart";
+				if (!(p instanceof FilePart)) {
+					System.err.println("Error: cannot get size.");
+					throw new InternalError();
+				} else {
+					FilePart fp = (FilePart)p;
+					if (!fp.getFilename().equals(filename)) {
+						System.err.println("Error: wrong file received: `" + fp.getFilename() + "`");
+						throw new ProtocolError();
+					}
+					if (fp.getOffset() == 0) {
+						try {
+							Files.write(new File(partsSubdir + filename + "_0.part").toPath(), fp.getPartialContent());
+						} catch (IOException e) {
+							System.err.println("Error: cannot write file (" + partsSubdir + filename + "_0.part)");
+						}
+						size = fp.getTotalSize();
+						if (fp.getPartialContent().length == size) {
+							stop = true;
+						}
+					} else {
+						System.err.println("Error: wrong file part received.");
+						throw new InternalError();
+					}
+				}
+			} catch (EmptyDirectory e) {
+				System.err.println("Error: empty directory.");
+				throw new InternalError();
+			} catch (EmptyFile e) {
+				// TODO: use more specific errors
+				throw new InternalError();
+			} catch (ProtocolError e) {
+				throw new InternalError();
+			} catch (InternalRemoteError e) {
+				throw new InternalError();
+			} catch (VersionRemoteError e) {
+				throw new InternalError();
+			} catch (ProtocolRemoteError e) {
+				throw new InternalError();
+			} catch (TransmissionError e) {
+				throw new InternalError();
+			} catch (VersionError e) {
+				throw new InternalError();
+			} catch (SizeError e) {
+				throw new InternalError();
+			} catch (NotFound e) {
+				throw new InternalError();
+			}
+		} catch (IOException e) {
+			throw new InternalError();
+		} catch (SocketClosed e){
+			System.err.println("setSize : SocketClosed");
+		}
+	}
+
+	/** Success getter.
+	 * @return	true when file have successfully been reassembled.
+	 */
+	public boolean getSuccess() {
+		return success;
+	}
+
+	private void reassembleFile() {
+		boolean firstPart = true;
+		boolean abort = false;
+		long nextOffset = 0;
+		do {
+			if (firstPart) {
+				System.err.println("Reassembling: First part");
+				try {
+					// create file
+					Files.copy(new File(partsSubdir + filename + "_" + nextOffset + ".part").toPath(), new File(dirStorage + filename).toPath(), StandardCopyOption.REPLACE_EXISTING);
+					nextOffset = (new File(dirStorage + filename)).length();
+					firstPart = false;
+				} catch (IOException e) {
+					System.err.println("Reassembling: aborting on first part");
+					abort = true;
+				}
+			} else if (nextOffset >= size) {
+				success = true;
+				System.err.println("Reassembling: success");
+			} else {
+				// append to file
+				try {
+					Files.write(new File(dirStorage + filename).toPath(), Files.readAllBytes(new File(partsSubdir + filename + "_" + nextOffset + ".part").toPath()), StandardOpenOption.APPEND);
+					nextOffset = (new File(dirStorage + filename)).length();
+				} catch (IOException e) {
+					abort = true;
+					System.err.println("Aborting: bad number " + nextOffset);
+				}
+			}
+		} while((!success) && (!abort));
+	}
+}

src/clientP2P/ClientDownloadUDP.java

@@ -0,0 +1,380 @@
+package clientP2P;
+import clientP2P.ClientDownloadPartUDP;
+import tools.HostItem;
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Random;
+import remoteException.EmptyDirectory;
+import remoteException.EmptyFile;
+import remoteException.VersionRemoteError;
+import remoteException.ProtocolRemoteError;
+import remoteException.NotFound;
+import remoteException.InternalRemoteError;
+import protocolP2P.HashAlgorithm;
+import protocolP2P.HashResponse;
+import protocolP2P.HashRequest;
+import protocolP2P.ProtocolP2PPacketUDP;
+import protocolP2P.Payload;
+import exception.ProtocolError;
+import exception.InternalError;
+import exception.TransmissionError;
+import exception.SizeError;
+import exception.VersionError;
+import protocolP2P.FilePart;
+import protocolP2P.LoadRequest;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.io.File;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.nio.file.StandardCopyOption;
+
+/** Class to download file from udp
+* @author	Louis Royer
+* @author	Flavien Haas
+* @author	JS Auge
+* @version	1.0
+*/
+public class ClientDownloadUDP implements Runnable {
+
+	private List<HostItem> hostList;
+	private String filename;
+	private byte[] hash512;
+	private List<ClientDownloadPartUDP> sockList = new ArrayList<ClientDownloadPartUDP>();
+	private List<Long> offsetsToAsk = new ArrayList<Long>();
+	private List<Long> offsetsPending = new ArrayList<Long>();
+	private boolean stop;
+	private long size;
+	private static final long MAX_PARTIAL_SIZE = 4096;
+	private String partsSubdir;
+	private String dirStorage;
+	private boolean success = false;
+
+	/** Constructor with parameters: filename, list of hosts, parts subdirectory and dirStorage
+	 * @param filename	name of file to download
+	 * @param hostList	list of servers
+	 * @param partsSubdir	directory to store .part files
+	 * @param dirStorage	directory to write assembled file
+	 */
+	public ClientDownloadUDP(String filename, List<HostItem> hostList, String partsSubdir, String dirStorage) {
+		this.partsSubdir = partsSubdir;
+		this.dirStorage = dirStorage;
+		this.filename = filename;
+		this.hostList = hostList;
+		this.stop = false;
+	}
+
+	/** Asks thread to stop
+	 */
+	public void setStop() {
+		stop = true;
+	}
+	
+	/** Runnable implementation
+	 */
+	public void run() {
+		try {
+			init();
+			if (stop) {
+				System.err.println("File is smaller than part max size.");
+				hostList.get(0).closeUDPSocket();
+			} else {
+				System.err.println("File is bigger than part max size.");
+				purgeList();
+				initThreads();
+				while(!stop) {
+					assignTasks();
+					checkTasksStatus();
+
+				}
+			}
+			System.err.println("Reassembling file parts.");
+			reassembleFile();
+		} catch(InternalError e) {
+			System.err.println("Error while downloading file. Aborting.");
+		} finally {
+			stopTasks();
+		}
+	}
+
+	/** Starts threads for each server in hostList.
+	 */
+	private void initThreads() {
+		for(HostItem hostItem: hostList) {
+			sockList.add(new ClientDownloadPartUDP(this, filename, hostItem.getUDPSocket(), partsSubdir));
+		}
+		for(ClientDownloadPartUDP c: sockList) {
+			Thread t = new Thread(c);
+			t.start();
+		}
+		System.err.println("Threads initialized");
+	}
+
+	/** Remove tasks from failed threads. Update done status.
+	 * @throws	InternalError
+	 */
+	private void checkTasksStatus() throws InternalError {
+		try {
+			synchronized(this) {
+				this.wait();
+				List<ClientDownloadPartUDP> sockListCpy = new ArrayList<>(sockList);
+				for(ClientDownloadPartUDP c: sockListCpy) {
+					if (c.hasFailed() == true) {
+						sockList.remove(c);
+						offsetsPending.removeAll(c.getFailed());
+						offsetsToAsk.addAll(c.getFailed());
+					}
+					try {
+						offsetsPending.removeAll(c.getDone());
+					} catch (InterruptedException e) {
+						throw new InternalError();
+					}
+				}
+				System.err.println("Task check status: " + offsetsToAsk.size() + " to asks, " + offsetsPending.size() + " pending");
+				if (offsetsToAsk.isEmpty() && offsetsPending.isEmpty()) {
+					stop = true;
+				}
+				if (sockList.size() == 0) {
+					System.err.println("No thread working");
+					throw new InternalError();
+				}
+			}
+		} catch (InterruptedException e) {
+			throw new InternalError();
+		}
+	}
+
+	/** Assign tasks randomly to threads.
+	 * @throws	InternalError
+	 */
+	private void assignTasks() throws InternalError {
+		Random rand = new Random();
+		for(long offset : offsetsToAsk) {
+			try {
+				sockList.get(rand.nextInt(sockList.size())).assignTask(offset);
+				offsetsPending.add(offset);
+				System.err.println("Assigned task "+ offset);
+			} catch(InterruptedException e) {
+				throw new InternalError();
+			}
+		}
+		offsetsToAsk.removeAll(offsetsPending);
+	}
+
+	/** Stop threads */
+	private void stopTasks() {
+		for(ClientDownloadPartUDP c : sockList) {
+			try {
+				c.setStop();
+			} catch (InterruptedException e) {}
+		}
+	}
+
+	/** Get hashsum from server.
+	 * @param hostItem	server to ask hash
+	 * @return	hash512sum
+	 * @throws	InternalError
+	 */
+	private byte[] getHashSum512(HostItem hostItem) throws InternalError {
+		byte[] hash;
+		HashAlgorithm[] hashesAlgo = new HashAlgorithm[1];
+		hashesAlgo[0] = HashAlgorithm.SHA512;
+		ProtocolP2PPacketUDP d = new ProtocolP2PPacketUDP((Payload) new HashRequest(filename, hashesAlgo));
+		try {
+			d.sendRequest((Object)hostItem.getUDPSocket());
+			try {
+				Payload pHash = d.receiveResponse().getPayload();
+				assert pHash instanceof HashResponse : "This payload must be instance of HashResponse";
+				if (!(pHash instanceof HashResponse)) {
+					throw new InternalError();
+				} else { 
+					hash = ((HashResponse)pHash).getHash(HashAlgorithm.SHA512);
+				}
+			} catch (EmptyDirectory e) {
+				hash = new byte[0];
+			} catch (NotFound e) {
+				hash = new byte[0];
+				// TODO: use more specific errors
+			} catch (EmptyFile e) {
+				throw new InternalError();
+			} catch (ProtocolError e) {
+				throw new InternalError();
+			} catch (InternalRemoteError e) {
+				throw new InternalError();
+			} catch (VersionRemoteError e) {
+				throw new InternalError();
+			} catch (ProtocolRemoteError e) {
+				throw new InternalError();
+			} catch (TransmissionError e) {
+				throw new InternalError();
+			} catch (VersionError e) {
+				throw new InternalError();
+			} catch (SizeError e) {
+				throw new InternalError();
+			}
+			return hash;
+		} catch (IOException e) {
+			throw new InternalError();
+		}
+	}
+
+	/** Removes servers not owning the correct file to download from list.
+	 * This is done by comparing hash512sum.
+	 * @throws	InternalError
+	 */
+	private void purgeList() throws InternalError {
+		List<HostItem> blackList = new ArrayList<HostItem>();
+		boolean first = false;
+		byte[] hashsum;
+		for(HostItem host: hostList) {
+			// already have hashsum from 1st server
+			if (!first) {
+				first = true;
+				continue;
+			}
+			// ask hashsum
+			hashsum = getHashSum512(host);
+			if (!Arrays.equals(hash512, hashsum)) {
+				blackList.add(host);
+			}
+		}
+		// purge list
+		for(HostItem host: blackList) {
+			hostList.remove(host);
+		}
+		System.err.println("Host list purge: done");
+	}
+
+	/** Getter for hash512sum
+	 * @return	hash512sum
+	 */
+	public byte[] getHashSum512() {
+		return hash512;
+	}
+
+	/** Initialize infos about file to download (size, hash512sum, partslist to dl).
+	 * Also download first partfile (to get size).
+	 * @throws	InternalError
+	 */
+	private void init() throws InternalError {
+		// get size
+		setSize();
+		
+		// get hashsum from 1st server in list
+		hash512 = getHashSum512(hostList.get(0));
+		if (hash512.length == 0) {
+			System.err.println("Error: no hash512sum support.");
+			throw new InternalError();
+		}
+		
+		// Add tasks
+		if (!stop) {
+			for(long i=MAX_PARTIAL_SIZE; i<size;i+=MAX_PARTIAL_SIZE) {
+				offsetsToAsk.add(Long.valueOf(i));
+			}
+			System.err.println("Adding tasks: done");
+		}
+	}
+
+	/** Set size of file to download. Also download first file part.
+	 * @throws InternalError
+	 */
+	private void setSize() throws InternalError {
+		ProtocolP2PPacketUDP d = new ProtocolP2PPacketUDP((Payload) new LoadRequest(filename, 0, MAX_PARTIAL_SIZE));
+		try {
+			d.sendRequest((Object)hostList.get(0).getUDPSocket());
+			try {
+				Payload p = d.receiveResponse().getPayload();
+				assert p instanceof FilePart : "This payload must be instance of FilePart";
+				if (!(p instanceof FilePart)) {
+					System.err.println("Error: cannot get size.");
+					throw new InternalError();
+				} else {
+					FilePart fp = (FilePart)p;
+					if (!fp.getFilename().equals(filename)) {
+						System.err.println("Error: wrong file received: `" + fp.getFilename() + "`");
+						throw new ProtocolError();
+					}
+					if (fp.getOffset() == 0) {
+						try {
+							Files.write(new File(partsSubdir + filename + "_0.part").toPath(), fp.getPartialContent());
+						} catch (IOException e) {
+							System.err.println("Error: cannot write file (" + partsSubdir + filename + "_0.part)");
+						}
+						size = fp.getTotalSize();
+						if (fp.getPartialContent().length == size) {
+							stop = true;
+						}
+					} else {
+						System.err.println("Error: wrong file part received.");
+						throw new InternalError();
+					}
+				}
+			} catch (EmptyDirectory e) {
+				System.err.println("Error: empty directory.");
+				throw new InternalError();
+			} catch (EmptyFile e) {
+				// TODO: use more specific errors
+				throw new InternalError();
+			} catch (ProtocolError e) {
+				throw new InternalError();
+			} catch (InternalRemoteError e) {
+				throw new InternalError();
+			} catch (VersionRemoteError e) {
+				throw new InternalError();
+			} catch (ProtocolRemoteError e) {
+				throw new InternalError();
+			} catch (TransmissionError e) {
+				throw new InternalError();
+			} catch (VersionError e) {
+				throw new InternalError();
+			} catch (SizeError e) {
+				throw new InternalError();
+			} catch (NotFound e) {
+				throw new InternalError();
+			}
+		} catch (IOException e) {
+			throw new InternalError();
+		}
+	}
+
+	/** Success getter.
+	 * @return	true when file have successfully been reassembled.
+	 */
+	public boolean getSuccess() {
+		return success;
+	}
+
+	private void reassembleFile() {
+		boolean firstPart = true;
+		boolean abort = false;
+		long nextOffset = 0;
+		do {
+			if (firstPart) {
+				System.err.println("Reassembling: First part");
+				try {
+					// create file
+					Files.copy(new File(partsSubdir + filename + "_" + nextOffset + ".part").toPath(), new File(dirStorage + filename).toPath(), StandardCopyOption.REPLACE_EXISTING);
+					nextOffset = (new File(dirStorage + filename)).length();
+					firstPart = false;
+				} catch (IOException e) {
+					System.err.println("Reassembling: aborting on first part");
+					abort = true;
+				}
+			} else if (nextOffset >= size) {
+				success = true;
+				System.err.println("Reassembling: success");
+			} else {
+				// append to file
+				try {
+					Files.write(new File(dirStorage + filename).toPath(), Files.readAllBytes(new File(partsSubdir + filename + "_" + nextOffset + ".part").toPath()), StandardOpenOption.APPEND);
+					nextOffset = (new File(dirStorage + filename)).length();
+				} catch (IOException e) {
+					abort = true;
+					System.err.println("Aborting: bad number " + nextOffset);
+				}
+			}
+		} while((!success) && (!abort));
+	}
+}

src/clientP2P/ClientManagementTCP.java

@@ -4,7 +4,6 @@ import exception.ProtocolError;
 import exception.SizeError;
 import exception.TransmissionError;
 import exception.VersionError;
-import exception.SocketClosed;
 import remoteException.EmptyFile;
 import remoteException.EmptyDirectory;
 import remoteException.InternalRemoteError;
@@ -13,15 +12,16 @@ import remoteException.ProtocolRemoteError;
 import remoteException.VersionRemoteError;
 import java.net.UnknownHostException;
 import java.util.Scanner;
-import java.net.InetAddress;
-import java.net.SocketException;
-import java.net.Socket;
+//import java.net.InetAddress;
+//import java.net.SocketException;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.io.File;
 import java.nio.file.Paths;
 import java.nio.file.StandardOpenOption;
 import java.util.Arrays;
+import java.util.List;
+import tools.HostItem;
 import protocolP2P.ProtocolP2PPacketTCP;
 import protocolP2P.Payload;
 import protocolP2P.RequestResponseCode;
@@ -33,8 +33,8 @@ import protocolP2P.HashRequest;
 import protocolP2P.HashResponse;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
-import tools.HostItem;
-import java.util.List;
+import clientP2P.ClientDownloadTCP;
+import exception.SocketClosed;
 
 /** Implementation of P2P-JAVA-PROJECT CLIENT
  * @author	Louis Royer
@@ -44,30 +44,32 @@ import java.util.List;
  */
 public class ClientManagementTCP implements Runnable {
 	private String baseDirectory;
+	private String partsSubdir;
 	private List<HostItem> hostList;
 
-
 	/** Constructor for TCP implementation, with baseDirectory and TCPPort parameters.
 	 * @param baseDirectory	the root directory where files are stored
 	 * @param host	hostname of the server
 	 * @param TCPPort	the server will listen on this port
 	 */
-	public ClientManagementTCP(String baseDirectory, List<HostItem> hostList) {
+	public ClientManagementTCP(String baseDirectory, List<HostItem> hostList, String partsSubdir) {
 		this.baseDirectory = baseDirectory;
 		this.hostList = hostList;
+		this.partsSubdir = partsSubdir;
 	}
 
 	/** Implementation of Runnable
 	 */
 	public void run() {
 		try {
+			System.out.println("Enter all servers: type \"stop\" when finished");
+			Scanner scanner = new Scanner(System.in);
 			String[] list = listDirectory();
 			System.out.println("Files present on the server:");
 			for(String listItem: list) {
 				System.out.println(listItem);
 			}
 			System.out.println("Name of the file to download:");
-			Scanner scanner = new Scanner(System.in);
 			String f = scanner.nextLine();
 			download(f);
 			System.out.println("File sucessfully downloaded");
@@ -77,8 +79,6 @@ public class ClientManagementTCP implements Runnable {
 			System.err.println("Error: Client internal error");
 		} catch (UnknownHostException e) {
 			System.err.println("Error: Server host is unknown");
-		} catch (SocketClosed e) {
-			System.err.println("Error: Request cannot be send or response cannot be received");
 		} catch (IOException e) {
 			System.err.println("Error: Request cannot be send or response cannot be received");
 		} catch (TransmissionError e) {
@@ -99,10 +99,6 @@ public class ClientManagementTCP implements Runnable {
 			System.err.println("Error: Server has not this file in directory");
 		} catch (EmptyFile e) {
 			System.err.println("Error: File is empty");
-		} finally {
-			for (HostItem h: hostList) {
-				h.closeTCPSocket();
-			}
 		}
 	}
 
@@ -112,7 +108,6 @@ public class ClientManagementTCP implements Runnable {
 	 * @throws	InternalError
 	 * @throws	UnknownHostException
 	 * @throws	IOException
-	 * @throws	SocketClosed
 	 * @throws	TransmissionError
 	 * @throws	ProtocolError
 	 * @throws	VersionError
@@ -122,117 +117,41 @@ public class ClientManagementTCP implements Runnable {
 	 * @throws	VersionRemoteError
 	 * @throws	EmptyFile
 	 */
-	private void download(String filename) throws EmptyFile, NotFound, InternalError, UnknownHostException, IOException, SocketClosed, TransmissionError, ProtocolError, VersionError, SizeError, InternalRemoteError, ProtocolRemoteError, VersionRemoteError {
-		byte [] hash512;
-		final long MAX_PARTIAL_SIZE = 4096;
-		HashAlgorithm[] hashesAlgo = new HashAlgorithm[1];
-		hashesAlgo[0] = HashAlgorithm.SHA512;
-		ProtocolP2PPacketTCP d = new ProtocolP2PPacketTCP((Payload) new HashRequest(filename, hashesAlgo));
-		d.sendRequest((Object)hostList.get(0).getTCPSocket());
+	private void download(String filename) throws EmptyFile, NotFound, InternalError, UnknownHostException, IOException, TransmissionError, ProtocolError, VersionError, SizeError, InternalRemoteError, ProtocolRemoteError, VersionRemoteError {
+		ClientDownloadTCP downLoader = new ClientDownloadTCP(filename, hostList, partsSubdir, baseDirectory);
+		Thread t = new Thread(downLoader);
+		t.start();
 		try {
-			Payload pHash = d.receiveResponse().getPayload();
-			assert pHash instanceof HashResponse : "This payload must be instance of HashResponse";
-			if (!(pHash instanceof HashResponse)) {
-				throw new InternalError();
-			} else { 
-				hash512 = ((HashResponse)pHash).getHash(HashAlgorithm.SHA512);
-				if (hash512.length == 0) {
-					System.err.println("Error: server do not support sha512 hashes");
-					throw new InternalError();
-				}
-			}
-		} catch (EmptyDirectory e) {
-			System.err.println("Error: empty directory, but request was not LIST_REQUEST");
-			throw new ProtocolError();
-		}
-
-		d = new ProtocolP2PPacketTCP((Payload) new LoadRequest(filename, 0, MAX_PARTIAL_SIZE));
-		d.sendRequest((Object)hostList.get(0).getTCPSocket());
-		boolean fileFullyWritten = false;
-		long offset = 0;
-		do {
-			try {
-				Payload p = d.receiveResponse().getPayload();
-				assert p instanceof FilePart : "This payload must be instance of FilePart";
-				if (!(p instanceof FilePart)) {
-					throw new InternalError();
-				} else {
-					FilePart fp = (FilePart)p;
-					if (!fp.getFilename().equals(filename)) {
-						System.err.println("Error: wrong file received: `" + fp.getFilename() + "`");
-						throw new ProtocolError();
+			t.join();
+			if (downLoader.getSuccess()) {
+				byte[] hash512 = downLoader.getHashSum512();
+				if (!Arrays.equals(hash512, computeHashsum(filename, HashAlgorithm.SHA512))) {
+					System.err.println("Error: Hashsum does not match");
+					System.err.println("Computed checksum:");
+					byte[] c = computeHashsum(filename, HashAlgorithm.SHA512);
+					for (byte b: c) {
+						System.err.print(String.format("%02X", b));
 					}
-					if (fp.getOffset() == 0) {
-						System.err.println("Receiving first partialContent");
-						// first partialContent
-						// increment offset
-						offset = fp.getPartialContent().length;
-						/* write first partialContent */
-						try {
-							Files.write(new File(baseDirectory + filename).toPath(), fp.getPartialContent());
-						} catch (IOException e) {
-							System.err.println("Error: cannot write file (" + baseDirectory + filename + ")");
-						}
-						// next partialContentRequest
-						if (offset != fp.getTotalSize()) {
-							System.err.println("Sending following request with offset: " + offset + " maxpartialsize: " + MAX_PARTIAL_SIZE);
-							d = new ProtocolP2PPacketTCP((Payload) new LoadRequest(filename, offset, MAX_PARTIAL_SIZE));
-							d.sendRequest((Object)hostList.get(0).getTCPSocket());
-						} else {
-							fileFullyWritten = true;
-						}
-					} else if (offset == fp.getOffset()){
-						System.err.println("Receiving following partialContent (offset: " + offset + ")");
-						// following
-						// increment offset
-						offset += fp.getPartialContent().length;
-						/* write following partialContent at end of file*/
-						try {
-							Files.write(Paths.get(baseDirectory + filename), fp.getPartialContent(), StandardOpenOption.APPEND);
-						} catch (IOException e) {
-							System.err.println("Error: cannot write file (" + baseDirectory + filename + ")");
-						}
-						if (offset >= fp.getTotalSize()) {
-							fileFullyWritten = true;
-						} else {
-							// next partialContentRequest
-							d = new ProtocolP2PPacketTCP((Payload) new LoadRequest(filename, offset, MAX_PARTIAL_SIZE));
-							d.sendRequest((Object)hostList.get(0).getTCPSocket());
-						}
-
-					} else {
-						System.err.println("offset: " + fp.getOffset() + " ; content.length: " + fp.getPartialContent().length + " ; totalSize: " + fp.getTotalSize());
-						System.err.println("Error: cannot handle non-consecutive partial files (not implemented)");
-						throw new InternalError();
+					System.err.println("");
+					System.err.println("Received checksum:");
+					for (byte b: hash512) {
+						System.err.print(String.format("%02X", b));
 					}
+					System.err.println("");
+					throw new InternalError();
 				}
-			} catch (EmptyDirectory e) {
-				throw new ProtocolError();
-			}
-		} while(!fileFullyWritten);
-		if (!Arrays.equals(hash512, computeHashsum(filename, HashAlgorithm.SHA512))) {
-			System.err.println("Error: Hashsum does not match");
-			System.err.println("Computed checksum:");
-			byte[] c = computeHashsum(filename, HashAlgorithm.SHA512);
-			for (byte b: c) {
-				System.err.print(String.format("%02X", b));
-			}
-			System.err.println("");
-			System.err.println("Received checksum:");
-			for (byte b: hash512) {
-				System.err.print(String.format("%02X", b));
+			} else {
+				throw new InternalError();
 			}
-			System.err.println("");
+		} catch (InterruptedException e) {
 			throw new InternalError();
 		}
-		hostList.get(0).closeTCPSocket();
 	}
 
 	/** list server’s directory content
 	 * @return	list of files
 	 * @throws	InternalError
 	 * @throws	UnknowHostException
-	 * @throws	SocketClosed
 	 * @throws	IOException
 	 * @throws	TransmissionError
 	 * @throws	ProtocolError
@@ -243,10 +162,10 @@ public class ClientManagementTCP implements Runnable {
 	 * @throws	ProtocolRemoteError
 	 * @throws	VersionRemoteError
 	 */
-	private String[] listDirectory() throws EmptyDirectory, InternalError, UnknownHostException, SocketClosed, IOException, TransmissionError, ProtocolError, VersionError, SizeError, InternalRemoteError, ProtocolRemoteError, VersionRemoteError {
+	private String[] listDirectory() throws EmptyDirectory, InternalError, UnknownHostException, IOException, TransmissionError, ProtocolError, VersionError, SizeError, InternalRemoteError, ProtocolRemoteError, VersionRemoteError {
 		ProtocolP2PPacketTCP d = new ProtocolP2PPacketTCP(new Payload(RequestResponseCode.LIST_REQUEST));
-		d.sendRequest((Object)hostList.get(0).getTCPSocket());
 		try {
+			d.sendRequest((Object)hostList.get(0).getTCPSocket());
 			Payload p = d.receiveResponse().getPayload();
 			assert p instanceof FileList : "This payload must be instance of Filelist";
 			if (!(p instanceof FileList)) {
@@ -258,6 +177,9 @@ public class ClientManagementTCP implements Runnable {
 			throw new ProtocolError();
 		} catch (EmptyFile e) {
 			throw new ProtocolError();
+		} catch (SocketClosed e){
+			System.err.println("listDirectory : SocketClosed");
+			throw new ProtocolError();
 		}
 	}
 

src/clientP2P/ClientManagementUDP.java

@@ -34,6 +34,7 @@ import protocolP2P.HashRequest;
 import protocolP2P.HashResponse;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
+import clientP2P.ClientDownloadUDP;
 
 /** Implementation of P2P-JAVA-PROJECT CLIENT
  * @author	Louis Royer
@@ -43,6 +44,7 @@ import java.security.NoSuchAlgorithmException;
  */
 public class ClientManagementUDP implements Runnable {
 	private String baseDirectory;
+	private String partsSubdir;
 	private List<HostItem> hostList;
 
 	/** Constructor for UDP implementation, with baseDirectory and UDPPort parameters.
@@ -50,9 +52,10 @@ public class ClientManagementUDP implements Runnable {
 	 * @param host	hostname of the server
 	 * @param UDPPort	the server will listen on this port
 	 */
-	public ClientManagementUDP(String baseDirectory, List<HostItem> hostList) {
+	public ClientManagementUDP(String baseDirectory, List<HostItem> hostList, String partsSubdir) {
 		this.baseDirectory = baseDirectory;
 		this.hostList = hostList;
+		this.partsSubdir = partsSubdir;
 	}
 
 	/** Implementation of Runnable
@@ -115,106 +118,32 @@ public class ClientManagementUDP implements Runnable {
 	 * @throws	EmptyFile
 	 */
 	private void download(String filename) throws EmptyFile, NotFound, InternalError, UnknownHostException, IOException, TransmissionError, ProtocolError, VersionError, SizeError, InternalRemoteError, ProtocolRemoteError, VersionRemoteError {
-		byte[] hash512;
-		final long MAX_PARTIAL_SIZE = 4096;
-		HashAlgorithm[] hashesAlgo = new HashAlgorithm[1];
-		hashesAlgo[0] = HashAlgorithm.SHA512;
-		ProtocolP2PPacketUDP d = new ProtocolP2PPacketUDP((Payload) new HashRequest(filename, hashesAlgo));
-		d.sendRequest((Object)hostList.get(0).getUDPSocket());
+		ClientDownloadUDP downLoader = new ClientDownloadUDP(filename, hostList, partsSubdir, baseDirectory);
+		Thread t = new Thread(downLoader);
+		t.start();
 		try {
-			Payload pHash = d.receiveResponse().getPayload();
-			assert pHash instanceof HashResponse : "This payload must be instance of HashResponse";
-			if (!(pHash instanceof HashResponse)) {
-				throw new InternalError();
-			} else { 
-				hash512 = ((HashResponse)pHash).getHash(HashAlgorithm.SHA512);
-				if (hash512.length == 0) {
-					System.err.println("Error: server do not support sha512 hashes");
-					throw new InternalError();
-				}
-			}
-		} catch (EmptyDirectory e) {
-			System.err.println("Error: empty directory, but request was not LIST_REQUEST");
-			throw new ProtocolError();
-		}
-
-		d = new ProtocolP2PPacketUDP((Payload) new LoadRequest(filename, 0, MAX_PARTIAL_SIZE));
-		d.sendRequest((Object)hostList.get(0).getUDPSocket());
-		boolean fileFullyWritten = false;
-		long offset = 0;
-		do {
-			try {
-				Payload p = d.receiveResponse().getPayload();
-				assert p instanceof FilePart : "This payload must be instance of FilePart";
-				if (!(p instanceof FilePart)) {
-					throw new InternalError();
-				} else {
-					FilePart fp = (FilePart)p;
-					if (!fp.getFilename().equals(filename)) {
-						System.err.println("Error: wrong file received: `" + fp.getFilename() + "`");
-						throw new ProtocolError();
+			t.join();
+			if (downLoader.getSuccess()) {
+				byte[] hash512 = downLoader.getHashSum512();
+				if (!Arrays.equals(hash512, computeHashsum(filename, HashAlgorithm.SHA512))) {
+					System.err.println("Error: Hashsum does not match");
+					System.err.println("Computed checksum:");
+					byte[] c = computeHashsum(filename, HashAlgorithm.SHA512);
+					for (byte b: c) {
+						System.err.print(String.format("%02X", b));
 					}
-					if (fp.getOffset() == 0) {
-						System.err.println("Receiving first partialContent");
-						// first partialContent
-						// increment offset
-						offset = fp.getPartialContent().length;
-						/* write first partialContent */
-						try {
-							Files.write(new File(baseDirectory + filename).toPath(), fp.getPartialContent());
-						} catch (IOException e) {
-							System.err.println("Error: cannot write file (" + baseDirectory + filename + ")");
-						}
-						// next partialContentRequest
-						if (offset != fp.getTotalSize()) {
-							System.err.println("Sending following request with offset: " + offset + " maxpartialsize: " + MAX_PARTIAL_SIZE);
-							d = new ProtocolP2PPacketUDP((Payload) new LoadRequest(filename, offset, MAX_PARTIAL_SIZE));
-							d.sendRequest((Object)hostList.get(0).getUDPSocket());
-						} else {
-							fileFullyWritten = true;
-						}
-					} else if (offset == fp.getOffset()){
-						System.err.println("Receiving following partialContent (offset: " + offset + ")");
-						// following
-						// increment offset
-						offset += fp.getPartialContent().length;
-						/* write following partialContent at end of file*/
-						try {
-							Files.write(Paths.get(baseDirectory + filename), fp.getPartialContent(), StandardOpenOption.APPEND);
-						} catch (IOException e) {
-							System.err.println("Error: cannot write file (" + baseDirectory + filename + ")");
-						}
-						if (offset >= fp.getTotalSize()) {
-							fileFullyWritten = true;
-						} else {
-							// next partialContentRequest
-							d = new ProtocolP2PPacketUDP((Payload) new LoadRequest(filename, offset, MAX_PARTIAL_SIZE));
-							d.sendRequest((Object)hostList.get(0).getUDPSocket());
-						}
-
-					} else {
-						System.err.println("offset: " + fp.getOffset() + " ; content.length: " + fp.getPartialContent().length + " ; totalSize: " + fp.getTotalSize());
-						System.err.println("Error: cannot handle non-consecutive partial files (not implemented)");
-						throw new InternalError();
+					System.err.println("");
+					System.err.println("Received checksum:");
+					for (byte b: hash512) {
+						System.err.print(String.format("%02X", b));
 					}
+					System.err.println("");
+					throw new InternalError();
 				}
-			} catch (EmptyDirectory e) {
-				throw new ProtocolError();
-			}
-		} while(!fileFullyWritten);
-		if (!Arrays.equals(hash512, computeHashsum(filename, HashAlgorithm.SHA512))) {
-			System.err.println("Error: Hashsum does not match");
-			System.err.println("Computed checksum:");
-			byte[] c = computeHashsum(filename, HashAlgorithm.SHA512);
-			for (byte b: c) {
-				System.err.print(String.format("%02X", b));
-			}
-			System.err.println("");
-			System.err.println("Received checksum:");
-			for (byte b: hash512) {
-				System.err.print(String.format("%02X", b));
+			} else {
+				throw new InternalError();
 			}
-			System.err.println("");
+		} catch (InterruptedException e) {
 			throw new InternalError();
 		}
 	}

src/clientP2P/ClientP2P.java

@@ -1,41 +1,89 @@
 package clientP2P;
 import clientP2P.ClientManagementUDP;
 import clientP2P.ClientManagementTCP;
+import serverP2P.ServerManagementUDP;
+import serverP2P.ServerManagementTCP;
+import tools.Directories;
+import tools.Logger;
+import tools.LogLevel;
 import tools.Directories;
 import java.util.Scanner;
 import java.util.List;
 import tools.HostItem;
 import tools.HostList;
+import java.lang.NumberFormatException;
 
 public class ClientP2P {
+	static private final String subdir = "seeded/";
+	static private String parts = ".parts";
+	private Logger logger;
 	private String host;
 	private int port;
 	private Directories directories;
 	private List<HostItem> hostList;
-	private String parts = ".parts";
-	public ClientP2P() {
-		directories = new Directories("P2P_JAVA_PROJECT_CLIENT");
+	private static final int defaultPort = 20000;
+
+	public void initLogger() {
+		if (directories == null && logger == null) {
+			directories = new Directories("P2P_JAVA_PROJECT" + port);
+			logger = new Logger(directories.getDataHomeDirectory() + "server.log");
+		}
+	}
+
+	public ClientP2P(String portStr) {
+		try{
+			port = Integer.valueOf(Integer.parseInt(portStr));
+		} catch (NumberFormatException e){
+			int oldPort = port;
+			port = defaultPort;
+			initLogger();
+			System.err.println("Error incorrect port " + oldPort + " using default port " + defaultPort);
+			logger.write("incorrect port " + oldPort + " using default port " + defaultPort, LogLevel.Info);
+		}
+		initLogger();
+		directories.createSubdir(subdir);
 		directories.createSubdir(parts);
 		host = "localhost";
-		port = 40001;
-		System.out.println("Client will try to contact server at " + host + " on port " + port + ". It will save files in " + directories.getDataHomeDirectory());
-		directories.askOpenDataHomeDirectory(null);
+		System.out.println("Server will listen on port " + port + " and serve files from " + directories.getDataHomeDirectory() + subdir);
+		directories.askOpenDataHomeDirectory(subdir);
 		System.out.println("Please enter list of servers to use; first one will be used to ask list of files");
-		hostList = HostList.getServList();
 	}
 
 	public static void main(String [] args) {
-		ClientP2P c = new ClientP2P();
-		System.out.println("Which transport protocol do you want to use? [TCP/udp]");
+		ClientP2P c;
+		try {
+			c = new ClientP2P(args[1]);
+		} catch (IndexOutOfBoundsException e){
+			c = new ClientP2P("" + defaultPort);
+		}
+
+		ServerManagementUDP smudp = new ServerManagementUDP(c.directories.getDataHomeDirectory() + subdir, c.port, c.logger);
+		ServerManagementTCP smtcp = new ServerManagementTCP(c.directories.getDataHomeDirectory() + subdir, c.port, c.logger);
+		Thread tudp = new Thread(smudp);
+		tudp.setName("server UDP P2P-JAVA-PROJECT");
+		tudp.start();
+		Thread ttcp = new Thread(smtcp);
+		ttcp.setName("server TCP P2P-JAVA-PROJECT");
+		ttcp.start();
+
+		try {
+			Thread.sleep(100);
+		} catch(InterruptedException e) {
+			Thread.currentThread().interrupt();
+		}
+
+		c.hostList = HostList.getServList();
+		System.out.println("Client : Which transport protocol do you want to use? [TCP/udp]");
 		Scanner sc = new Scanner(System.in);
 		String transportchoosen = sc.nextLine();
 		Thread t;
 		switch(transportchoosen){
 			case "UDP":
 			case "udp":
+			case "upd": // alias typo
 			case "2" :
 				System.out.println("Starting with UDP");
-				ClientManagementUDP cmudp = new ClientManagementUDP(c.directories.getDataHomeDirectory(), c.hostList);
+				ClientManagementUDP cmudp = new ClientManagementUDP(c.directories.getDataHomeDirectory(), c.hostList, c.directories.getDataHomeDirectory() + c.parts + "/");
 				t = new Thread(cmudp);
 				break;
 			case "TCP":
@@ -43,7 +91,7 @@ public class ClientP2P {
 			case "1":
 			default:
 				System.out.println("Starting with TCP");
-				ClientManagementTCP cmtcp = new ClientManagementTCP(c.directories.getDataHomeDirectory(), c.hostList);
+				ClientManagementTCP cmtcp = new ClientManagementTCP(c.directories.getDataHomeDirectory(), c.hostList, c.directories.getDataHomeDirectory() + c.parts + "/");
 				t = new Thread(cmtcp);
 				break;
 		  }

src/serverP2P/ServerP2P.java

@@ -11,16 +11,19 @@ public class ServerP2P {
 	private Logger logger;
 
 
-	public ServerP2P() {
-		directories = new Directories("P2P_JAVA_PROJECT_SERVER");
+	public ServerP2P(String portStr) {
+		port = Integer.valueOf(Integer.parseInt(portStr));
+		directories = new Directories("P2P_JAVA_PROJECT_SERVER_" + port);
 		directories.createSubdir(subdir);
 		logger = new Logger(directories.getDataHomeDirectory() + "server.log");
-		port = 40001;
 		System.out.println("Server will listen on port " + port + " and serve files from " + directories.getDataHomeDirectory() + subdir);
 		directories.askOpenDataHomeDirectory(subdir);
 	}
 	public static void main(String [] args) {
-		ServerP2P s = new ServerP2P();
+		/* first arg must be port number
+		 * run with: java -ea serverP2P.ServerP2P -- <portNumber>
+		 * */
+		ServerP2P s = new ServerP2P(args[1]);
 		ServerManagementUDP smudp = new ServerManagementUDP(s.directories.getDataHomeDirectory() + subdir, s.port, s.logger);
 		ServerManagementTCP smtcp = new ServerManagementTCP(s.directories.getDataHomeDirectory() + subdir, s.port, s.logger);
 		Thread tudp = new Thread(smudp);

src/tools/Logger.java

@@ -30,7 +30,7 @@ public class Logger {
 	/** Appends log to filelog and print to stderr.
 	 * @param text	Text to log
 	 */
-	private void write(String text, LogLevel logLevel) {
+	public void write(String text, LogLevel logLevel) {
 		String msg = "[" + new Timestamp(System.currentTimeMillis()) + "] " + text + "\n";
 		String level = null;
 		switch (logLevel) {
@@ -109,7 +109,7 @@ public class Logger {
 	public void writeUDP(String text, LogLevel logLevel) {
 		write("[UDP] " + text, logLevel);
 	}
-	
+
 	/** Appends log to filelog and print to stderr.
 	 * Adds [UDP] in log line.
 	 * @param text	Text to log