[SNMP4J] I loose the response PDU with asynchronous send method
Frank Fock
fock at agentpp.com
Fri Mar 11 19:18:08 CET 2005
Hi Rodolfo,
OK, I did not carefully enough read your posting. The log
shows that the pending requests are removed before the
timeout. So I guess that the main thread probably either
calls the Snmp.cancel() method or the Snmp.close() method
before the response has been received.
Best regards,
Frank
Rodolfo Josÿffffe9 Castellanos Jaimes wrote:
>Hi friends,
>
>When I say "I think the timeout shouldn't has
>influence because the tests are in the same machine
>and there shouldn't be delay between the request and
>the response.", that I mean is that the response and
>the request are processed in the same computer (my
>desktop computer). The "manager" and the "agent" are
>the same: localhost.
>
>Bye,
>Rodolfo José Castellanos Jaimes.
>
> --- Rodolfo Josÿffffe9 Castellanos Jaimes
><rodolfojcj at yahoo.com> escribió:
>
>
>>Hi Frank, thanks for your answer.
>>
>>By default I have a timeout of 1000 micro seconds.
>>I've tested increasing this time and the behavior is
>>the same. For example I've set the timeout to 5000
>>micro seconds. I think the timeout shouldn't has
>>influence because the tests are in the same machine
>>and there shouldn't be delay between the request and
>>the response.
>>
>>I've just changed the asynchronous "send" method by
>>its equivalent synchronous one. And here the
>>behavior
>>is correct: I always get the response.
>>
>>Now, I'm doing this:
>>////
>>...
>>...
>>...
>> PDU responsePDU = null;
>> ResponseEvent responseEvent = null;
>> responseEvent = snmp.send( requestPDU, target );
>> if ( responseEvent != null )
>> responsePDU = responseEvent.getResponse();
>> snmp.close();
>> // then, I process the response to show the
>>output...
>>...
>>...
>>...
>>///
>>
>>And the output is like this:
>>
>>///////////// *) Always successful for me !!!
>>
>>[rodolfojcj at gandalf testPrograms]$ java -cp
>>.:lib/SNMP4J.jar:lib/log4j-1.2.7.jar
>>ProgramWithSnmp4J
>>Se ha creado la vista
>>0 [main] DEBUG org.snmp4j.security.Salt -
>>Initialized
>>Salt to c545429a6909c503.
>>75 [main] DEBUG
>>org.snmp4j.transport.DefaultUdpTransportMapping -
>>Sending message to 150.187.64.101/161 with length
>>43:
>>
>>
>>
>30:29:02:01:00:04:06:70:75:62:6c:69:63:a0:1c:02:04:67:fe:98:a0:02:01:00:02:01:00:30:0e:30:0c:06:08:2b:06:01:02:01:01:03:00:05:00
>
>
>>81 [main] DEBUG org.snmp4j.Snmp - New pending
>>request
>>with handle PduHandle[1744738464]
>>180 [Thread-1] INFO
>>org.snmp4j.transport.DefaultUdpTransportMapping -
>>UDP
>>receive buffer size for socket 150.187.64.101/0 is
>>set
>>to: 32767
>>181 [Thread-1] DEBUG
>>org.snmp4j.transport.DefaultUdpTransportMapping -
>>Received message from
>>gandalf.unet.edu.ve/150.187.64.101/161 with length
>>46:
>>
>>
>>
>30:2c:02:01:00:04:06:70:75:62:6c:69:63:a2:1f:02:04:67:fe:98:a0:02:01:00:02:01:00:30:11:30:0f:06:08:2b:06:01:02:01:01:03:00:43:03:03:d2:c9
>
>
>>278 [Thread-1] DEBUG org.snmp4j.Snmp - Removing
>>pending request with handle PduHandle[1744738464]
>>Se ha recibido el evento pduArrived...
>>
>>
>> Error Index = 0
>> Error Status = 0
>> Error Status Text = Success
>> PDU Type Number = -94
>> PDU Type String = RESPONSE
>> OID = Value ...
>> There are 1 responsed variables
>> 1.3.6.1.2.1.1.3.0 = 0:41:45.69
>>/////////////
>>
>>I will be more tests to see if I can catch what is
>>hapenning, and thanks again by the answers.
>>
>>Bye,
>>Rodolfo José Castellanos Jaimes
>>
>> --- Frank Fock <fock at agentpp.com> escribió:
>>
>>
>>>Hi Rodolfo,
>>>
>>>Have you tried to increase the timeout value for
>>>your target yet?
>>>It seems that the agent's response is received too
>>>late (the timeout
>>>has already removed the corresponding request
>>>object).
>>>
>>>Best regards,
>>>Frank
>>>
>>>Rodolfo Josÿffffe9 Castellanos Jaimes wrote:
>>>
>>>
>>>
>>>>Hi friends.
>>>>
>>>>I have the following code to send a GET PDU to
>>>>localhost. I'm testing with asynchronous methods.
>>>>
>>>>This is the code of the method that I use to send
>>>>
>>>>
>>>the
>>>
>>>
>>>>PDU (I'm guiding me by the snmp4j_tool console
>>>>
>>>>
>>app.
>>
>>
>>>>source code and some others that I've written):
>>>>
>>>>///////////
>>>>
>>>>public void send()
>>>>{
>>>> try
>>>> {
>>>> this.target = createTarget();
>>>> target.setVersion( snmpVersion );
>>>> target.setAddress( targetAddress );
>>>> target.setRetries( maxRetries );
>>>> target.setTimeout( timeout );
>>>>
>>>> Snmp snmp = createSnmpSession();
>>>> snmp.listen();
>>>>
>>>> // create the request PDU
>>>> PDU requestPDU = createPDU( target );
>>>>
>>>> if ( requestPDU.getType() == PDU.GETBULK )
>>>> {
>>>> }
>>>> for ( int i=0; i <
>>>>
>>>>
>>>variableBindingsVector.size();
>>>
>>>
>>>>i++)
>>>> {
>>>> // add the variables that will be requested
>>>> requestPDU.add( variableBindingsVector.get(
>>>>
>>>>
>>i
>>
>>
>>>)
>>>
>>>
>>>>);
>>>> }
>>>> // the listener that will "listen" the
>>>>
>>>>
>>response
>>
>>
>>>>PDU
>>>> ResponseListener responseListener =
>>>>createResponseListener();
>>>> // send the PDU
>>>> snmp.send(requestPDU, target , null,
>>>>responseListener);
>>>> }
>>>> catch( IOException ioe )
>>>> {
>>>> }
>>>>} // end method send
>>>>
>>>>///////////
>>>>
>>>>Then, I compile and run a test application that
>>>>request some variables within the MIB-II System
>>>>
>>>>
>>>group.
>>>
>>>
>>>>When I run it, sometimes I get the response PDU
>>>>
>>>>
>>>(which
>>>
>>>
>>>>I process to produce some output) but sometimes I
>>>>
>>>>
>>>get
>>>
>>>
>>>>no answer.
>>>>
>>>>Here I show you two samples of differents
>>>>
>>>>
>>outputs.
>>
>>
>>>I
>>>
>>>
>>>>put the Logger Level to Level.ALL with the aim of
>>>>
>>>>
>>>see
>>>
>>>
>>>>what could be hapenning. These outputs are
>>>>
>>>>
>>produced
>>
>>
>>>by
>>>
>>>
>>>>the same code, in the same machine, with the same
>>>>packages of SNMP4J and Log4J.
>>>>
>>>>///// 1) Not successful for me
>>>>[rodolfojcj at gandalf testPrograms]$ java -cp
>>>>.:lib/SNMP4J.jar:lib/log4j-1.2.7.jar
>>>>ProgramWithSnmp4J
>>>>Se ha creado la vista
>>>>Se ha agregado el PduListener
>>>>0 [main] DEBUG org.snmp4j.security.Salt -
>>>>
>>>>
>>>Initialized
>>>
>>>
>>>>Salt to 1c9c18862b9d60ca.
>>>>85 [Thread-1] INFO
>>>>org.snmp4j.transport.DefaultUdpTransportMapping
>>>>
>>>>
>>-
>>
>>
>>>UDP
>>>
>>>
>>>>receive buffer size for socket 150.187.64.101/0
>>>>
>>>>
>>is
>>
>>
>>>set
>>>
>>>
>>>>to: 32767
>>>>163 [main] DEBUG
>>>>org.snmp4j.transport.DefaultUdpTransportMapping
>>>>
>>>>
>>-
>>
>>
>>>>Sending message to 150.187.64.101/161 with length
>>>>
>>>>
>>>43:
>>>
>>>
>=== message truncated ===
>
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