Control different relation sequence

[Gustavo Niemeyer]

Hi Mike,

You cannot control the sequence in which the hooks are executed, but
you have full control of what you do when the hooks do execute. You
can choose to send nothing to the other side of the relation until its
time to report that a connection may now be established, and when you
do change the relation, the remote hook will run again to report the
change.

On Tue, Sep 3, 2013 at 10:17 PM, Mike Sam <mikesam460 at gmail.com> wrote:
> Imagine a unit needs to be added to an existing service like service A.
> Service A is already in relations with other services like Service B and
> Service C on different "requires".
>
> For the new unit on Service A to work, it needs to first process the
> relation_joined and relation_changed with the units of service B before it
> could process  relation_joined and relation_changed with the units of
> service C.
>
> Is there a way to enforce such desired sequence relationship establishment
> at the charm level? In other words, I do not think we can control the hook
> execution sequence of different relationships officially but then I am
> wondering how can we do a situation like above nicely?
>
> Thanks,
> Mike
>
>
>
>
>
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-- 
gustavo @ http://niemeyer.net