[SNMP4J] SNMP4J multiple threads

[Frank Fock]

Hello Francis,

 From your code it seems that you create a
transport mapping and Snmp instance for each
request. Although that can be done, I strongly
do not recommend it for frequent requests,
because there is a lot overhead in creating
a transport mapping and a Snmp instance.

You should use both for application life time,
if possible.

In any case, call Snmp.close() when you no longer
want to use a Snmp instance.

Best regards,
Frank

Francis LIMOUSY wrote:
> 
> Hello,
> 
> I'm using snmp4j in a threaded application, fetching synchronously data.
> I have this problem: threads don't seem to be de-allocated.
> I have plenty of UdpDefaultTransportMapping stacking into memory until 
> the application crash (out of system resources).
> 
> My question is: is this a Thread issue or a snmp4j issue ?
> 
> My code is quite simple for the moment, the created threads run the 
> following code:
> 
>        try{
>            TransportMapping transport = new DefaultUdpTransportMapping();
>            Snmp snmp = new Snmp(transport);
>                      PDU pdu = new PDU();
> 
>            for(String oid : oids){
>                pdu.add(new VariableBinding(new OID(oid)));
>            }
> 
>            pdu.setType(PDU.GETNEXT);                                
> CommunityTarget target = new CommunityTarget();
>            target.setCommunity(new OctetString(community));
>                      target.setAddress(targetAddress);
>                      target.setVersion(Integer.parseInt(version));
>                     transport.listen();
>                      ResponseEvent response = snmp.send(pdu, 
> target);                                if (response.getResponse() == 
> null) {
>                System.out.println("Timeout");
>            }
>            else {                       //handle response
>               (...)
>            }
>          }
> 
> 
> 
> I guess the problem occur here :
> ResponseEvent response = snmp.send(pdu, target);
> 
> which is synchronous if I get the examples well.
> So I guess some of my threads are blocking here, aren't they ?
> If so, how can I specify a timeout ? Is there another way of doing this ?
> 
> Thanks for any help on this problem.
> 
> I'm using SNMP protocol v1, Java 1.5 on a windows environment
> 
> 
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> 
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