[SNMP4J] Updating registered managed objects (adding rows to MIB table)

[Frank Fock]

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
>
>   
>
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