Regarding CDB Data

CDB and CDB API
1

Hi,

As per my my understanding, CDB config data is preserved across Confd restarts by saving them and retrieving them from XML files. My intention is to utilize transaction and set-hooks to trigger a south-bound message from the application and this configuration is stored in CDB.

My question is two-fold:

  1. I was wondering if there was any way to invoke the same transaction or set-hook callbacks that were utilized to trigger the sound-bound message when CDB is restored with the configuration data from the XML files upon a restart?

  2. Is it possible to fetch a CDB element’s value(read operation) during the commit phase of a transaction for example in the create callback’s execution?

2

  1. sounds like a use case for cdb_trigger_subscription (or confd_cmd -c trigger_subscriptions, if you prefer to call it from a shell). But that would not invoke set-hook callbacks, only the CDB subscribers (I assume this is what you mean by “south-bound message”). I am not aware of any simple way to re-trigger data-provider callbacks.

  2. Yes, you can open a CDB session while processing the callback. Just be careful, the callbacks are supposed to react quickly.