Michelle,
It is correct, that MOScalar and DefaultMOTable are not
synchronized against concurrent access - even not against
concurrent write access.
Nevertheless, you can lock a ManagedObject by calling
http://www.snmp4j.org/agent/doc/org/snmp4j/agent/MOServer.html#lock(java.lang.Object,
org.snmp4j.agent.ManagedObject)
against concurrent write access (and do not forget to
call unlock afterwards ;-)
This should be enough for almost all cases. However,
if you need more synchronization (i.e., also against
concurrent read access) then you will have to overwrite
the methods in the ManagedObject interface of DefaultMOTable
by subclassing it and introduce your own sync scheme.
Best regards,
Frank
Larson, Michelle R wrote:
Frank-
I'm thinking I want to implement a timer that periodically checks the
table to see if any of the rows are invalid and remove them. But I'm
worried about threading issues. I was planning to call remove on the
DefaultMOTable for my ipTable, but that class doesn't appear to be
synchronized, so what happens if I try to remove a row at the same time
I'm adding one? What is your recommendation for dealing with such
concurrency issues?
Thanks again for your input!
Michelle Larson
-----Original Message-----
From: Frank Fock [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 19, 2008 12:12 AM
To: Larson, Michelle R
Cc: [email protected]
Subject: Re: [SNMP4J] Implementing RFC 1213
Hi Michelle,
You can also remove rows on events on any other columnar object of that
or any other table/scalar of the agent.
If you do so, please make sure that the row removal takes place in the
*commit* or *cleanup* phase.
BTW, RFC1213 is obsolete. Use IP-MIB (RFC4293) instead.
Best regards,
Frank
Larson, Michelle R wrote:
Hi-
I'm using SNMP4J-Agent version 1.1.3 and I'm trying to implement
RFC 1213. The problem I'm having is in the ipRouteTable. The RFC
description says that if the ipRouteType is set to invalid, then the
agent has the option of removing that row from the table. How would I
go about implementing that in my agent? It appears the SNMP4J-Agent
only allows me to remove rows if they have a RowStatus field, but this
table does not have that. I tried removing the row once I get a
rowChanged notification, but that seems to cause null pointer
exceptions and the agent cannot finish the command to invalidate the
row.
Any input would be appreciated.
Thank-you!
Michelle Larson
Boeing
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