[AGENT++] Problems with GET-NEXT and MibComplexEntry

[Alex Agranov]

Hi,

First of all, let me apologize for this post containing too many
details. I tried my best to make it as short as possible, and still
provide meaningful explanation of my problem... 

I'm trying to create a MIB via AGENT++ with all data stored in my own
database (not inside AGENT++ classes). In order to do that I sub-class
MibComplexEntry and implement the following methods: get_request(),
get_next_request() and find_succ(). My MIB consists of a few tables,
therefore I create an instance of MibComplexEntry for each table and add
all these instances to my MibGroup:

    myTable1::myTable1() : myMibComplexEntry("1.3.6.1.4.1.5003.9.1.1.1")
        {...}
    myTable2::myTable2() :
myMibComplexEntry("1.3.6.1.4.1.5003.9.1.1.2.1.1")
        {...}
    myTable3::myTable3() :
myMibComplexEntry("1.3.6.1.4.1.5003.9.1.1.2.2.1")
        {...}
    myTable4::myTable4() :
myMibComplexEntry("1.3.6.1.4.1.5003.9.1.1.2.3.1")
        {...}
    
    myGroup::myGroup(): MibGroup("1.3.6.1.4.1.5003.9.1", "my_group")
    {
        add(new myTable1());
        add(new myTable2());
        add(new myTable3());
        add(new myTable4());
        ...
    }

GET method seems to work perfectly fine. GET-NEXT within the same table
also works fine. However when I try to GET-NEXT on the last entry in,
for example, Table 2 - 1.3.6.1.4.1.5003.9.1.1.2.1.1.22.0, AGENT++ enters
into the endless loop:
    1) it calls myTable2->find_next() and I return empty Oidx() object, 
       since there are no more entries in this table
    2) then it calls myTable3->find_next() and I return empty Oidx()
object
       again, because currently table 3 is empty
    3) then I'd expect it to call myTable4->find_next(), but instead
       it calls myTable2->find_next() again and we're back to square 1) 

I debugged Mib::process_request() and found that it does the following:
    1) it calls find_next() for oid 1.3.6.1.4.1.5003.9.1.1.2.1.1.22.0
    2) find_next() does the following:
        2.1) calls find_managing_object() and finds myTable2
        2.2) calls myTable2->find_succ()
        2.3) calls context->find_next() for myTable2 oid
("1.3.6.1.4.1.5003.9.1.1.2.1.1")
             and finds myTable3
    3) we're back to process_request() - enter switch(entry->type()),
       and call myTable3->find_succ()
    4) but then it does "goto reprocess", because myTable3->find_succ()
       returned empty oid (remember, I told you that there are no
entries
       in Table 3)
    5) so we're back to square 2 - tmpoid wasn't changed, so we find
myTable2
       again - and voila we're in the endless loop
       
So, am I doing something wrong in myMibComplexEntry class? I thought
that I'm supposed to return empty Oidx() when there are no entries in my
table. Is this wrong?

Thank you in advance,
    Alex Agranov