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On Wed, Mar 9, 2016 at 9:40 AM, Ihar Hrachyshka <ihrachys at redhat.com> wrote:
> Vikash Kumar <vikash.kumar at oneconvergence.com> wrote:
>
>>
>>
>> On Wed, Mar 9, 2016 at 3:42 PM, Vikash Kumar
>> <vikash.kumar at oneconvergence.com> wrote:
>> I have written a sample neutron agent which subscribe for the AFTER_CREATE
>> event of router. I have defined a sample method as callback, but the method
>> doesn't gets called anytime.
>>
>> Also, in logs:
>>
>> 2016-03-09 01:36:08.220 7075 DEBUG neutron.callbacks.manager [-]
>> Subscribe: <function add_router at 0x7fdbbc482ed8> router after_create
>> subscribe /opt/stack/neutron/neutron/callbacks/manager.py:41
>>
>>
>>     which means the subscription is successful.
>>
>>    Do I need to enable anything in config file to get that ? Or am I
>> missing something ?
>
>
> First, nothing oslo specific is discussed here, so [oslo] tag is probably
> redundant.
>
> Overall, I believe you try to rely on wrong thing that won’t deliver for
> you: callbacks are internal to neutron-server, so events triggered by
> neutron-servers will never reach any other processes (like your agent).

The same callbacks mechanism is also used in the L3 agent, but as Ihar
said, events in one process (neutron-server) will not trigger
callbacks in another process (l3-agent). If that's what you want,
you'll need RPC.

>
> More info: http://docs.openstack.org/developer/neutron/devref/callbacks.html
>
> Ihar
>
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