[SNMP4J] enable SNMP monitoring for Java app with existing MBeans

[david pocivalnik]

Hi Frank,

thanks for the explanations. I left only open issues (for readability) 
and commented inline.

On 2/21/2013 1:25 AM, Frank Fock wrote:
> Please find my comments inline below:
> Am 19.02.2013 11:10, schrieb david pocivalnik:
>> but, I don't understand some details.
[...]
>> - the OID's I'm using start with "1.3.6.1.4.", when adding a View (in
>> the agent, vacm.addViewTreeFamily) I thought that when removing
>> vacm.addViewTreeFamily(new OctetString("fullReadView"), new OID("1.3"),
>> new OctetString(), VacmMIB.vacmViewIncluded, StorageType.nonVolatile);
>> I would only get an error back, but I again received the value.
> It seems that there is another view associated with the group mapped to
> your user that allows access to the OID.

I haven't checked that yet.

>> - with SNMP it is possible to set and get values, but just to be sure, i
>> can't call a method from an SNMP manager that returns void, but executes
>> the method called?
> SNMP4J-AgentJMX provides MBeanActionMOScalarSupport to support actions
> (= method call)
> on scalars:
> http://www.snmp4j.org/agentJMX/doc/org/snmp4j/agent/mo/jmx/MBeanActionMOScalarSupport.html
> The mapping of the action parameters is provided through MBeanActionInfo.

thanks. I added

private static final Object[][] SCALAR_MBEANS_IMP_ACTIONS = {
		{ TestManagementMib.oidImpCall, 			new MBeanStateInfo[] { new 
MBeanStateInfo(2, null, null) },
new MBeanActionInfo[] { new MBeanActionInfo(3, "startImport", new 
Object[0]) }}};

scalarSupportActions.addAll(onameImp, SCALAR_MBEANS_IMP_ACTIONS);

impCall = moFactory.createScalar(oidImpCall,
				moFactory.createAccess(MOAccessImpl.ACCESSIBLE_FOR_READ_WRITE), new 
Integer32());

to the designated methods, as done for SCALAR_MBEANS_JVM_MEMORY_ACTIONS 
in your example. The only problem, I can't seem to execute the method. 
I'm sure that's a problem with the snmp call. I tried with

libexec/check_snmp -H dp -C public -o .1.3.6.1.4.1.42.2.145.3.163.1.1.2.3.0
(script by nagios) and
snmpget -c public -v 2c dp .1.3.6.1.4.1.42.2.145.3.163.1.1.2.3.0

which should call gc(), but in both cases the response is

SNMP OK - 2 | iso.3.6.1.4.1.42.2.145.3.163.1.1.2.3.0=2 ,
iso.3.6.1.4.1.42.2.145.3.163.1.1.2.3.0 = INTEGER: 2 respectively.

the same is true for the method I tried to call in my small test 
application, which should just print something on the console of the 
agent when called.

i couldn't think of any other method that I could use. Do you have any 
idea what command to use to execute a method?

Thanks in advance and BR
David