org.xmlBlaster.engine.admin.extern.snmp
Class NodeTableObserver

java.lang.Object
  org.xmlBlaster.engine.admin.extern.snmp.NodeTableObserver

All Implemented Interfaces:

Observer

public class NodeTableObserver

extends java.lang.Object

implements Observer

NodeTableObserver represents the observer side of an observer pattern. When NodeTableObserver receives an update notification from NodeTableSubject, it adds or removes an entry to/from nodeTable.

Version:

@VERSION@

Author:

Udo Thalmann

Field Summary

private java.util.BitSet	indexSet
private static int	MAXINDX
private NodeEntryImpl	nodeEntryImpl
private java.util.Hashtable	nodeHashtable
private NodeTable	nodeTable
private NodeTableSubject	nodeTableSubject
private java.util.Hashtable	refCounts
private jax.AgentXSession	session

Constructor Summary

NodeTableObserver(NodeTableSubject nodeTableSubject, jax.AgentXSession session)
Adds itself to the nodeTableSubject as observer.

Method Summary

int	decrement(java.lang.Integer nodeIndex) Decrements the referenced client entries of this node.
java.lang.Integer	getIndex(java.lang.String key) Returns an index to nodeTable given a nodeName.
int	increment(java.lang.Integer nodeIndex) Increments the referenced client entries of this node.
void	sendTrap(jax.AgentXSession session) For each node table entry sendTrap checks trap condition maxClients * clientThreshold < numClients.
void	update(Subject o) Adds or removes a node entry to/from the node table.

Methods inherited from class java.lang.Object

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

Field Detail

nodeTableSubject

private NodeTableSubject nodeTableSubject

session

private jax.AgentXSession session

nodeEntryImpl

private NodeEntryImpl nodeEntryImpl

nodeTable

private NodeTable nodeTable

nodeHashtable

private java.util.Hashtable nodeHashtable

indexSet

private java.util.BitSet indexSet

refCounts

private java.util.Hashtable refCounts

MAXINDX

private static final int MAXINDX

See Also:

Constant Field Values

Constructor Detail

NodeTableObserver

public NodeTableObserver(NodeTableSubject nodeTableSubject,
                         jax.AgentXSession session)

Adds itself to the nodeTableSubject as observer. Creates a new nodeTable and adds it to the agentX session. Creates a Hashtable for (node, index) entries. Creates a BitSet for available indices. Creates a Hashtable for (node, reference) entries, where reference is a counter of referenced client entries.

Method Detail

increment

public int increment(java.lang.Integer nodeIndex)

Increments the referenced client entries of this node.

Returns:

int number of referenced client entries or -1, if nodeIndex identifies no node in the node table.

decrement

public int decrement(java.lang.Integer nodeIndex)

Decrements the referenced client entries of this node.

Returns:

int number of referenced client entries or -1, if nodeIndex identifies no node in the node table.

sendTrap

public void sendTrap(jax.AgentXSession session)

For each node table entry sendTrap checks trap condition maxClients * clientThreshold < numClients. Sends a ClientTableThresholdOverflow trap if the condition is fulfilled.

getIndex

public java.lang.Integer getIndex(java.lang.String key)

Returns an index to nodeTable given a nodeName.

Returns:

Integer index to nodeTable.

update

public void update(Subject o)

Adds or removes a node entry to/from the node table. Updates node indexSet. Updates nodeHashtable.

Specified by:

update in interface Observer