nachos.network
Class MailMessage

java.lang.Object
  nachos.network.MailMessage

public class MailMessage
extends Object

A mail message. Includes a packet header, a mail header, and the actual payload.

See Also:

Packet

Field Summary

byte[]	contents The contents of this message, excluding the mail message header.
int	dstPort The port used by this message on the destination machine.
static int	headerLength The number of bytes in a mail header.
static int	maxContentsLength Maximum payload (real data) that can be included in a single mesage.
Packet	packet This message, as a packet that can be sent through a network link.
static int	portLimit The upper limit on mail ports.
int	srcPort The port used by this message on the source machine.

Constructor Summary

MailMessage(int dstLink, int dstPort, int srcLink, int srcPort, byte[] contents)
Allocate a new mail message to be sent, using the specified parameters.

MailMessage(Packet packet)
Allocate a new mail message using the specified packet from the network.

Method Summary

String

toString() Return a string representation of the message headers.

Methods inherited from class java.lang.Object

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

Field Detail

packet

public Packet packet

This message, as a packet that can be sent through a network link.

dstPort

public int dstPort

The port used by this message on the destination machine.

srcPort

public int srcPort

The port used by this message on the source machine.

contents

public byte[] contents

The contents of this message, excluding the mail message header.

headerLength

public static final int headerLength

The number of bytes in a mail header. The header is formatted as follows:

offset	size	value
0	1	destination port
1	1	source port

See Also:

Constant Field Values

maxContentsLength

public static final int maxContentsLength

Maximum payload (real data) that can be included in a single mesage.

See Also:

Constant Field Values

portLimit

public static final int portLimit

The upper limit on mail ports. All ports fall between 0 and portLimit - 1.

See Also:

Constant Field Values

Constructor Detail

MailMessage

public MailMessage(int dstLink,
                   int dstPort,
                   int srcLink,
                   int srcPort,
                   byte[] contents)
            throws MalformedPacketException

Allocate a new mail message to be sent, using the specified parameters.

Parameters:

dstLink - the destination link address.

dstPort - the destination port.

srcLink - the source link address.

srcPort - the source port.

contents - the contents of the packet.

Throws:

MalformedPacketException

MailMessage

public MailMessage(Packet packet)
            throws MalformedPacketException

Allocate a new mail message using the specified packet from the network.

Parameters:

packet - the packet containg the mail message.

Throws:

MalformedPacketException

Method Detail

toString

public String toString()

Return a string representation of the message headers.

Overrides:

toString in class Object