backend
Class backEnd

java.lang.Object
  java.lang.Thread
      backend.backEnd

All Implemented Interfaces:

Runnable, snmp.SNMPTrapListener

public class backEnd

extends Thread

implements snmp.SNMPTrapListener

This class is the backend thread that spawns upto 15 ping thereads and 15 snmp threads. It controls the time interval inbetween each snmp and ping interval. It also has built in SNMP functions that allow for retervial of a remotes computers information and the ability to set specific information as well.

Field Summary

static boolean	pauseFlag a boolean that if set to false will do continous monitoring and if true it will pause the monitoring
static boolean	stopFlag A boolean if true means pinging and snmp calls should stop false means pinging and snmp calls should continue

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

backEnd()
this second constructor is needed for the mibBrowser

backEnd(BlackBoard fromMain)
Constructor which enables the interfaces to the blackbaord

Method Summary

void	processTrap(snmp.SNMPTrapPDU pdu) function that handles all the SNMP traps recived
void	run() This is where thread execution starts
static String	snmpGet(String OID, String ipAddress, String community) The simple version of snmpGet which just returns the value of the snmp calls
static String	snmpGetExtended(String OID, String ipAddress, String community) Get extended information about the snmp OID.
static Vector	snmpGetNext(String OID, String ipAddress, String community) GET NEXT OID...
static String	snmpGetTable(String OID, String ipAddress, String community) Used to get a SNMP table
boolean	snmpHasAgent(String ip)
static boolean	snmpHasAgent(String ip, String community) This function is used to check if a specific computer has SNMP installed or not
static boolean	snmpSet(String value, String OID, String host, String community) A function that used to set SNMP values given the OID to set
void	updateAllNodes() This it the main backend loop which continously monitors the computers using ping and snmp calls
void	updateNode(LanNode currentNode) This function updates the current node being passed in.

Methods inherited from class java.lang.Thread

activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getContextClassLoader, getName, getPriority, getThreadGroup, holdsLock, 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, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

stopFlag

public static boolean stopFlag

A boolean if true means pinging and snmp calls should stop false means pinging and snmp calls should continue

pauseFlag

public static boolean pauseFlag

a boolean that if set to false will do continous monitoring and if true it will pause the monitoring

Constructor Detail

backEnd

public backEnd(BlackBoard fromMain)

Constructor which enables the interfaces to the blackbaord

Parameters:

fromMain - Expects the blackboard class which was created in main

backEnd

public backEnd()

this second constructor is needed for the mibBrowser

Method Detail

run

public void run()

This is where thread execution starts

Specified by:

run in interface Runnable

updateAllNodes

public void updateAllNodes()

This it the main backend loop which continously monitors the computers using ping and snmp calls

snmpGet

public static String snmpGet(String OID,
                             String ipAddress,
                             String community)

The simple version of snmpGet which just returns the value of the snmp calls

Parameters:

OID - A string containing a valid OID number

ipAddress - String containing a valid ip address or hostname

Returns:

returns the value of the OID from the specified ip address

snmpSet

public static boolean snmpSet(String value,
                              String OID,
                              String host,
                              String community)

A function that used to set SNMP values given the OID to set

Parameters:

value - This is the value that is going to be set

OID - OID in string format

host - Contains the ip address or host name of the computer to set the value to.

Returns:

true if the set was sucessful false otherwise

snmpHasAgent

public boolean snmpHasAgent(String ip)

snmpHasAgent

public static boolean snmpHasAgent(String ip,
                                   String community)

This function is used to check if a specific computer has SNMP installed or not

Parameters:

ip - String containing either the hostname or ipaddress

Returns:

returns true if the ip address has snmp and returns false if it does not

snmpGetExtended

public static String snmpGetExtended(String OID,
                                     String ipAddress,
                                     String community)

Get extended information about the snmp OID. More verbose then snmpGet function

Parameters:

OID - String containing the OID value

ipAddress - String containing either the ip address or host name

Returns:

returns the extended string value of the OID

snmpGetNext

public static Vector snmpGetNext(String OID,
                                 String ipAddress,
                                 String community)

GET NEXT OID... PAUL I ADDED THIS METHOD BELOW... feel free to play around with it.. its the same as above except it makes a call to .getNextMIBEntry instead... so next OID in tree This is also the method i call from the mibBrowser to getAll OID's in tree... so pretty important ;)

snmpGetTable

public static String snmpGetTable(String OID,
                                  String ipAddress,
                                  String community)

Used to get a SNMP table

Parameters:

OID - String value containing the OID

ipAddress - String address containing either an ip address or hostname

Returns:

returns a string which contains a table of all of the OID values

processTrap

public void processTrap(snmp.SNMPTrapPDU pdu)

function that handles all the SNMP traps recived

Specified by:

processTrap in interface snmp.SNMPTrapListener

Parameters:

pdu - interface of information about the trap that came in

updateNode

public void updateNode(LanNode currentNode)

This function updates the current node being passed in. It does a ping update and a snmp update

Parameters:

currentNode - LanNode containing the node to be updated