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

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

All Implemented Interfaces:

Observer

public class ClientTableObserver

extends java.lang.Object

implements Observer

ClientTableObserver represents the observer side of an observer pattern. When ClientTableObserver receives an update notification from ClientTableSubject, it adds or removes an entry to/from clientTable.

Version:

@VERSION@

Author:

Udo Thalmann

Field Summary

private ClientEntryImpl	clientEntryImpl
private java.util.Hashtable	clientHashtable
private ClientTable	clientTable
private ClientTableSubject	clientTableSubject
private java.util.BitSet	indexSet
private static int	MAXINDX
private java.util.Hashtable	refCounts
private jax.AgentXSession	session

Constructor Summary

ClientTableObserver(ClientTableSubject clientTableSubject, jax.AgentXSession session)
Adds itself to the clientTableSubject as observer.

Method Summary

int	decrement(java.lang.Integer clientIndex) Decrements the referenced session entries of this client.
java.lang.Integer	getIndex(java.lang.String key) Returns an index to clientTable given a (nodeName + clientName)-key.
int	increment(java.lang.Integer clientIndex) Increments the referenced session entries of this client.
void	sendTrap(jax.AgentXSession session) For each client table entry sendTrap checks trap condition clientQueueMaxEntries * clientQueueThreshold < clientQueueNumEntries.
void	update(Subject o) Adds or removes a client entry to/from the client table.

Methods inherited from class java.lang.Object

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

Field Detail

clientTableSubject

private ClientTableSubject clientTableSubject

session

private jax.AgentXSession session

clientEntryImpl

private ClientEntryImpl clientEntryImpl

clientTable

private ClientTable clientTable

clientHashtable

private java.util.Hashtable clientHashtable

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

ClientTableObserver

public ClientTableObserver(ClientTableSubject clientTableSubject,
                           jax.AgentXSession session)

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

Method Detail

increment

public int increment(java.lang.Integer clientIndex)

Increments the referenced session entries of this client.

Returns:

ReferenceCounter number of referenced session entries. -1, if clientIndex identifies no client in the client table.

decrement

public int decrement(java.lang.Integer clientIndex)

Decrements the referenced session entries of this client.

Returns:

ReferenceCounter number of referenced session entries. -1, if clientIndex identifies no client in the client table.

sendTrap

public void sendTrap(jax.AgentXSession session)

For each client table entry sendTrap checks trap condition clientQueueMaxEntries * clientQueueThreshold < clientQueueNumEntries. Sends a ClientQueueThresholdOverflow trap if the condition is fulfilled. Checks trap condition maxSessions * sessionThreshold < numSessions. Sends a SessionTableThresholdOverflow trap if the condition is fulfilled.

getIndex

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

Returns an index to clientTable given a (nodeName + clientName)-key.

Returns:

Index to clientTable.

update

public void update(Subject o)

Adds or removes a client entry to/from the client table. Updates client indexSet. Updates clientHashtable. Updates reference counter in nodeTableObserver.

Specified by:

update in interface Observer