org.apache.log4j.net
Class LCDAppender.SocketHandler

java.lang.Object
  |
  +--java.lang.Thread
        |
        +--org.apache.log4j.net.LCDAppender.SocketHandler

All Implemented Interfaces:

java.lang.Runnable

Enclosing class:

LCDAppender

protected class LCDAppender.SocketHandler

extends java.lang.Thread

Field Summary

protected java.io.BufferedReader	_in
protected java.io.PrintWriter	_out
protected int	_prio
protected java.net.Socket	_s
protected boolean	done
protected int	height
protected java.util.LinkedList	img The image list holds the strings to be displayed.
protected java.util.LinkedList	ll Note: the list ll holds incoming messages from log4j.
protected int	width

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

LCDAppender.SocketHandler(java.lang.String host, int port, int priority)

Method Summary

void	finalize()
void	queryStop()
void	run()
java.lang.String	sanitize(java.lang.String s) LCDd 0.4.3 does not handle nested strings very well.
int	scanValue(java.lang.String r)
void	send(java.lang.String message)
void	sendCommand(java.lang.String s)
void	sendCommand(java.lang.String s, java.lang.String expected)
void	updateWidthAndHeight(java.lang.String r)

Methods inherited from class java.lang.Thread

activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getContextClassLoader, getName, getPriority, getThreadGroup, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setName, setPriority, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

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

Field Detail

done

protected boolean done

_s

protected java.net.Socket _s

_prio

protected int _prio

_out

protected java.io.PrintWriter _out

_in

protected java.io.BufferedReader _in

ll

protected java.util.LinkedList ll

Note: the list ll holds incoming messages from log4j. We need to wait for the client-server communication to be stable before we may send data. Connecting to the server, setting up a screen and all the widgets takes some time. Messages which arrive during this time must be stored somewhere as we cannot send them to the server yet. Messages are added at the end and removed at the head (FIFO).

img

protected java.util.LinkedList img

The image list holds the strings to be displayed. The numer is equal to the number of lines on the display ('height'). Initially, all lines are set to the empty string. When a new message arrived (list ll is not empty), it is removed from ll an appended to img. The first element of img is removed so the number of elements in img always remains equal to 'height'. After changes to the image list have been made, all contained lines are written to the LCD.

width

protected int width

height

protected int height

Constructor Detail

LCDAppender.SocketHandler

public LCDAppender.SocketHandler(java.lang.String host,
                                 int port,
                                 int priority)
                          throws java.io.IOException

Method Detail

finalize

public void finalize()

Overrides:

finalize in class java.lang.Object

send

public void send(java.lang.String message)

run

public void run()

Overrides:

run in class java.lang.Thread

sendCommand

public void sendCommand(java.lang.String s)
                 throws java.io.IOException

sendCommand

public void sendCommand(java.lang.String s,
                        java.lang.String expected)
                 throws java.io.IOException

updateWidthAndHeight

public void updateWidthAndHeight(java.lang.String r)
                          throws java.io.IOException

scanValue

public int scanValue(java.lang.String r)

sanitize

public java.lang.String sanitize(java.lang.String s)

LCDd 0.4.3 does not handle nested strings very well. Removal of all single quotation marks makes this safe at least.

queryStop

public void queryStop()