Re: Parsing Get/Set Requests in Table_Handler

2009/2/10 M. Zeeshan - IMS <[email protected]>:
> By reading section 6 of the file 'AGENT.txt' i am still unable to make neat
> sense and difference between RESERVE, RESERVE2 and ACTION....

In very general terms:

    RESERVE1:    Is this individual assignment OK?
           (type, value, etc)

    RESERVE2:    Is the assignment as a whole OK?
           consistency between varbinds, etc

    ACTION:          Apply the assignments

Now that's just a convention for the sort of processing needed in each pass.
The agent can actually do whatever it likes in each case, just as long as
it's  ready to back out again if one of the other varbind assignments fails.

So one possible alternative (particularly for creating a new row in a table),
might be to create the data structure for the new row in the RESERVE1 pass,
apply the new values in during RESERVE2, and check the consistency
and/or completeness of the row during the ACTION pass.

The advantage of that approach is that it doesn''t matter which order the
varbinds are processed in.   For example, assume there's a RowStatus
column, which is responsible for creating the new row structure, and checking
that the row is complete.

  Regardless of whether the RowStatus varbind comes first or last in the
list, the data structure will always created (in R1) *before* the
individual values
are inserted into it (in R2),  and all the values will be applied (in
R2) *before*
the validity is checked (in A).


That's not the only way to handle this, but it's certainly one
sensible approach.


> can you please specify a simple example to make this sense of or do i have
> to code for each of them and what will be the differences.

Have a look at the code for some of the current MIB modules, to see how
various people have handled this in the past.

Dave

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