[SNMP4J] Updating registered managed objects (adding rows to MIB table)
Frank Fock
fock at agentpp.com
Wed Feb 27 00:02:01 CET 2013
Marek,
"Can I just use addRow on the MOMutableTableModel type?"
Yes, that's what I wrote.
Best regards,
Frank
Am 26.02.2013 23:58, schrieb Marek Hajduczenia:
> Frank,
>
> Here is the code snippet for the main class (snmpAgentClientMain.java):
> http://snipt.org/zfhab7. The agent code starts in line 110, MIB table is
> constructed in lines 129 (using MOTableBuilder class) and createMibTable
> function defined in snmpAgentClientMain class. The MOTableBuilder.java class
> is snipped at http://snipt.org/zfhac3 and it is used to build the table
> structure in a more organized fashion.
>
> Looking through the code of the MOTableBuilder class, and seeing how it is
> used in snmpAgentClientMain class (line
> server.registerManagedObject(builder.build());), I am not cure how to add
> more row values to the table that was constructed using either the
> MOTableBuilder wrapper or using just functions defined in snmp4j library. At
> some point of time, MOTable has to be created (its structure defined), row
> values are added (I assume it is done using addRow function from snmp4j
> class), and then registered with the agent (server.registerManagedObject()
> function). Once it is registered, is there any way to just add rows with
> values to the previously registered MIB table? Can I just use addRow on the
> MOMutableTableModel type?
>
> Marek
>
> -----Original Message-----
> From: snmp4j-bounces at agentpp.org [mailto:snmp4j-bounces at agentpp.org] On
> Behalf Of Frank Fock
> Sent: Tuesday, 26 February, 2013 10:00 PM
> To: snmp4j at agentpp.org
> Subject: Re: [SNMP4J] Updating registered managed objects (adding rows to
> MIB table)
>
>
> Hi Marek,
>
> I do not know a "addRowValue" command and what is a "builder"?
> I meant to use the
> http://www.snmp4j.org/agent/doc/org/snmp4j/agent/mo/MOTable.html#addRow(R)
> method to add a row.
> A table definition (MIB specification) never has any rows.
>
> Best regards,
> Frank
>
> Am 26.02.2013 18:39, schrieb Marek Hajduczenia:
>> Hi Frank,
>>
>>
>>
>> thanks for the quick feedback. I must have not been really clear in my
>> explanation and I apologize for that. What I want to achieve is not to add
>> new rows into the table definition, but add new entries (new rows using
>> addRowValue command) into the table.
>>
>>
>>
>> In other words, how do I add row values (addRowValue) to builder after
>> having executed
>>
>>
>>
>> server.registerManagedObject(builder.build());
>>
>>
>>
>> ?
>>
>>
>>
>> When I try to add row values using builder.addRowValue and then register
> the
>> MO again, I get exception (quite expected, it is registered already)
>>
>>
>>
>> Thanks again
>>
>>
>>
>> Marek
>>
>>
>>
>>> Hi,
>>> The answer is very simple: Just add rows to the table (i.e. its table
>>> model).
>>> You can do this while the table itself is registered (operation is
>>> thread safe).
>>> Best regards,
>>> Frank
>>
>>
>>
>> Subject: Updating registered managed objects (adding rows to MIB table)
>>
>>
>>
>> Dear all,
>>
>>
>>
>> I am writing a small SNMP related project for my course. The task is to
>> create an SNMP agent that will monitor a local selected folder and list
> all
>> files stored in this folder in a MIB. I have already MIB designed, agent
>> working fine on the initial pass, i.e., it creates a MIB table, populates
>> initial values (files found at first pass through the folder) and then
>> registers MIB with the agent.
>>
>>
>>
>> The code snippet building the table structure is shown below:
>>
>>
>>
>> MOTableBuilder builder = new MOTableBuilder(oidNewRoot);
>>
>>
>>
>> // MIB structure
>>
>>
>>
>>
> builder.addColumnType(SMIConstants.SYNTAX_INTEGER32,MOAccessImpl.ACCESS_READ
>> _ONLY);
>>
>>
> builder.addColumnType(SMIConstants.SYNTAX_OCTET_STRING,MOAccessImpl.ACCESS_R
>> EAD_ONLY);
>>
>>
> builder.addColumnType(SMIConstants.SYNTAX_INTEGER,MOAccessImpl.ACCESS_READ_O
>> NLY);
>>
>>
> builder.addColumnType(SMIConstants.SYNTAX_OCTET_STRING,MOAccessImpl.ACCESS_R
>> EAD_ONLY);
>>
>>
> builder.addColumnType(SMIConstants.SYNTAX_INTEGER32,MOAccessImpl.ACCESS_READ
>> _ONLY);
>>
>>
> builder.addColumnType(SMIConstants.SYNTAX_INTEGER32,MOAccessImpl.ACCESS_READ
>> _ONLY);
>>
>>
> builder.addColumnType(SMIConstants.SYNTAX_OCTET_STRING,MOAccessImpl.ACCESS_R
>> EAD_ONLY);
>>
>>
> builder.addColumnType(SMIConstants.SYNTAX_OCTET_STRING,MOAccessImpl.ACCESS_R
>> EAD_ONLY);
>>
>>
> builder.addColumnType(SMIConstants.SYNTAX_INTEGER32,MOAccessImpl.ACCESS_READ
>> _ONLY);
>>
>>
> builder.addColumnType(SMIConstants.SYNTAX_INTEGER,MOAccessImpl.ACCESS_READ_W
>> RITE);
>>
>>
>>
>> The code snippet adding a row is shown below (it is repeated in a loop to
>> add all found files):
>>
>>
>>
>> builder.addRowValue(new Integer32(index));
>>
>> index++;
>>
>> builder.addRowValue(new OctetString(fileName.getName()));
>>
>> builder.addRowValue(new Integer32(3));
>>
>> builder.addRowValue(new OctetString(fileName.getPath()));
>>
>> builder.addRowValue(new Integer32((int)fileName.length()));
>>
>> builder.addRowValue(new Integer32(323));
>>
>> builder.addRowValue(new OctetString("Artista"));
>>
>> builder.addRowValue(new OctetString("Album"));
>>
>> builder.addRowValue(new Integer32(1980));
>>
>> builder.addRowValue(new Integer32(4));
>>
>>
>>
>> Finally, I register the new MIB with the agent:
>>
>>
>>
>> server.registerManagedObject(builder.build());
>>
>>
>>
>> After that, I run agent on a loop, every 5 seconds checking whether a new
>> file was added to the folder. When that happens, I can detect a new file
>> added and create list of such files. However, I do not know (could not
> find
>> any information) on how to add row to already registered MIB. One thought
>> was on reusing previously constructed table and just deregister it, then
> add
>> new rows as needed and the register again but it seems like a very crude
>> solution to me. Is there any way to do that better? if so, I would
>> appreciate any pointers.
>>
>>
>>
>> Thank you in advance
>>
>>
>>
>> Marek
>>
>>
>>
>> _______________________________________________
>> SNMP4J mailing list
>> SNMP4J at agentpp.org
>> http://lists.agentpp.org/mailman/listinfo/snmp4j
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