utilities
Class LengthPrefixMessage

java.lang.Object
  |
  +--utilities.Message
        |
        +--utilities.LengthPrefixMessage

All Implemented Interfaces:

java.lang.Cloneable

public class LengthPrefixMessage

extends Message

A message encoding where the content length is prepended to the message in a fixed width field (e.g. a valid message would be "0005hello"). Currently, this field with is fixed in the PREFIXLEN constant.

Constructor Summary

LengthPrefixMessage(java.lang.Object c, java.lang.String da)
A "tell" message

LengthPrefixMessage(java.lang.String s)
Send in your encoded message to decode it

LengthPrefixMessage(java.lang.String p, java.lang.Object c, java.lang.String da)
Normal constructor

Method Summary

static java.lang.String	receive(java.io.BufferedReader b) Reads it in, first looking for the length prefix, then using that to read the content.
void	setContent(java.lang.Object c) Sets the message's content string

Methods inherited from class utilities.Message

clone, contentData, contentData, contentWord, contentWord, getConnection, getContent, getData, getDestAddr, getDestPort, getReceiveTime, getSendTime, getSourceAddr, getSourcePort, receive, receive, send, send, setConnection, setData, setDestAddr, setDestPort, setReceiveTime, setSendTime, setSourceAddr, setSourcePort, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

LengthPrefixMessage

public LengthPrefixMessage(java.lang.String s)

Send in your encoded message to decode it

Parameters:

s - The length-prefixed message to decode

LengthPrefixMessage

public LengthPrefixMessage(java.lang.Object c,
                           java.lang.String da)

A "tell" message

Parameters:

c - The content to send

da - The destination address

LengthPrefixMessage

public LengthPrefixMessage(java.lang.String p,
                           java.lang.Object c,
                           java.lang.String da)

Normal constructor

Parameters:

p - The message performative (e.g. "ask", "tell", etc.)

c - The content to send

da - The destination address

Method Detail

receive

public static java.lang.String receive(java.io.BufferedReader b)

Reads it in, first looking for the length prefix, then using that to read the content.

Parameters:

b - The reader used to get the message

Returns:

The message data, or null if error occurs

setContent

public void setContent(java.lang.Object c)

Sets the message's content string

Overrides:

setContent in class Message

Parameters:

c - The content