protocolP2P

Class ProtocolP2PPacketUDP<T extends Payload>

java.lang.Object

protocolP2P.ProtocolP2PPacket<T>

protocolP2P.ProtocolP2PPacketUDP<T>

public class ProtocolP2PPacketUDP<T extends Payload>
extends ProtocolP2PPacket<T>

Representation of packet.

Version:

1.0

Author:

Louis Royer, Flavien Haas, JS Auge

Field Summary

Fields

Modifier and Type	Field and Description
private static int	CHECKSUM_POSITION
private HostItem	remoteHost
private java.net.DatagramSocket	requestSocket
private java.net.DatagramSocket	responseSocket
private java.net.SocketAddress	responseSocketAddress

Fields inherited from class protocolP2P.ProtocolP2PPacket

payload, version, VERSION_POSITION

Constructor Summary

Constructors

Modifier	Constructor and Description
private	ProtocolP2PPacketUDP(byte[] packet) Private constructor with packet as byte[] parameter (typically used when receiving Packet response).
	ProtocolP2PPacketUDP(java.lang.Object socket) Receive Request (typically used from server).
	ProtocolP2PPacketUDP(T payload) Constructor with payload parameter (typically used when sending packet).

Method Summary

Modifier and Type	Method and Description
private void	checkCheckSum(byte[] packet) Used to check if the checksum is correct
private int	computeCheckSum(byte[] packet) Compute checksum associated to packet.
private void	constructPacket(byte[] packet) Private constructor helper with packet as byte[] parameter (typically used when receiving Packet response/request).
private void	constructPacket(byte[] packet, java.net.DatagramSocket responseSocket) Private constructor helper with packet as byte[] parameter and (typically used when receiving Packet request).
HostItem	getHostItem() Get hostItem of the sender
ProtocolP2PPacket<?>	receiveResponse() Receive response (typically used by client).
protected void	send(java.net.DatagramSocket socket) Send a Packet.
protected void	send(java.net.DatagramSocket socket, java.net.SocketAddress addr) Send a Packet.
void	sendRequest(java.lang.Object socket) Send a Request throught socket.
<U extends ProtocolP2PPacket<?>> void	sendResponse(U response) Send a Response to a Request (typically used from server).
private void	setCheckSum(byte[] packet) Used to set checksum into packet
protected byte[]	toPacket() Returns a byte[] containing full packet (typically used when sending packet).

Methods inherited from class protocolP2P.ProtocolP2PPacket

checkProtocolVersion, getPayload

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

CHECKSUM_POSITION

private static final int CHECKSUM_POSITION

See Also:

Constant Field Values

remoteHost

private HostItem remoteHost

responseSocketAddress

private java.net.SocketAddress responseSocketAddress

responseSocket

private java.net.DatagramSocket responseSocket

requestSocket

private java.net.DatagramSocket requestSocket

Constructor Detail

ProtocolP2PPacketUDP

public ProtocolP2PPacketUDP(T payload)

Constructor with payload parameter (typically used when sending packet).

Parameters:

payload - the payload associated with the packet to send

ProtocolP2PPacketUDP

public ProtocolP2PPacketUDP(java.lang.Object socket)
                     throws TransmissionError,
                            ProtocolError,
                            VersionError,
                            InternalError,
                            SizeError,
                            java.io.IOException,
                            SocketClosed

Receive Request (typically used from server).

Parameters:

socket - socket used to receive request

Throws:

TransmissionError

ProtocolError

VersionError

InternalError

SizeError

java.io.IOException

SocketClosed

ProtocolP2PPacketUDP

private ProtocolP2PPacketUDP(byte[] packet)
                      throws TransmissionError,
                             ProtocolError,
                             VersionError,
                             InternalError,
                             SizeError

Private constructor with packet as byte[] parameter (typically used when receiving Packet response).

Parameters:

packet - the full Packet received

Throws:

TransmissionError

ProtocolError

VersionError

InternalError

SizeError

Method Detail

send

protected void send(java.net.DatagramSocket socket)
             throws InternalError,
                    java.io.IOException

Send a Packet. Socket must be set and connected.

Parameters:

socket - DatagramSocket used to send Packet.

Throws:

InternalError

java.io.IOException

send

protected void send(java.net.DatagramSocket socket,
                    java.net.SocketAddress addr)
             throws InternalError,
                    java.io.IOException

Send a Packet. Socket must be set and connected, or an addr can be given.

Parameters:

socket - DatagramSocket used to send Packet.

addr - SocketAddress used to send Packet.

Throws:

InternalError

java.io.IOException

sendRequest

public void sendRequest(java.lang.Object socket)
                 throws InternalError,
                        java.io.IOException

Send a Request throught socket. Socket must be connected (typically used from client).

Specified by:

sendRequest in class ProtocolP2PPacket<T extends Payload>

Parameters:

socket - DatagramSocket. Must be connected.

Throws:

InternalError

java.io.IOException

sendResponse

public <U extends ProtocolP2PPacket<?>> void sendResponse(U response)
                                                   throws InternalError,
                                                          java.io.IOException

Send a Response to a Request (typically used from server).

Specified by:

sendResponse in class ProtocolP2PPacket<T extends Payload>

Parameters:

response - Packet to send as a response.

Throws:

InternalError

java.io.IOException

receiveResponse

public ProtocolP2PPacket<?> receiveResponse()
                                     throws EmptyFile,
                                            NotFound,
                                            NotATracker,
                                            EmptyDirectory,
                                            InternalRemoteError,
                                            VersionRemoteError,
                                            ProtocolRemoteError,
                                            TransmissionError,
                                            ProtocolError,
                                            VersionError,
                                            InternalError,
                                            SizeError,
                                            java.io.IOException,
                                            UnknownHost

Receive response (typically used by client).

Specified by:

receiveResponse in class ProtocolP2PPacket<T extends Payload>

Returns:

ProtocolP2PPacket received

Throws:

EmptyFile

NotFound

NotATracker

EmptyDirectory

InternalRemoteError

VersionRemoteError

ProtocolRemoteError

TransmissionError

ProtocolError

VersionError

InternalError

SizeError

java.io.IOException

UnknownHost

constructPacket

private void constructPacket(byte[] packet)
                      throws TransmissionError,
                             ProtocolError,
                             VersionError,
                             InternalError,
                             SizeError

Private constructor helper with packet as byte[] parameter (typically used when receiving Packet response/request).

Parameters:

packet - the full Packet received

Throws:

TransmissionError

ProtocolError

VersionError

InternalError

SizeError

constructPacket

private void constructPacket(byte[] packet,
                             java.net.DatagramSocket responseSocket)
                      throws TransmissionError,
                             ProtocolError,
                             VersionError,
                             InternalError,
                             SizeError

Private constructor helper with packet as byte[] parameter and (typically used when receiving Packet request).

Parameters:

packet - the full Packet received

responseSocket - socket address used to reception this request (use this one to respond)

Throws:

TransmissionError

ProtocolError

VersionError

InternalError

SizeError

toPacket

protected byte[] toPacket()
                   throws InternalError

Returns a byte[] containing full packet (typically used when sending packet). This packet is complete and ready to be send.

Returns:

the full packet to send

Throws:

InternalError

computeCheckSum

private int computeCheckSum(byte[] packet)
                     throws SizeError

Compute checksum associated to packet.

Parameters:

packet - the full packet received

Throws:

SizeError

setCheckSum

private void setCheckSum(byte[] packet)
                  throws InternalError

Used to set checksum into packet

Parameters:

packet - full packet

Throws:

InternalError

checkCheckSum

private void checkCheckSum(byte[] packet)
                    throws TransmissionError

Used to check if the checksum is correct

Parameters:

packet - full packet

Throws:

TransmissionError

getHostItem

public HostItem getHostItem()
                     throws InternalError

Get hostItem of the sender

Specified by:

getHostItem in class ProtocolP2PPacket<T extends Payload>

Returns:

hostItem of the sender

Throws:

InternalError