Re: libpq object hooks

Tom Lane wrote:
> "Merlin Moncure" <mmoncure(at)gmail(dot)com> writes:
>
>> The problem is the functions PQhookData(conn, hookname) and
>> PQresultHookData(result, hookName). We need these to work in
>> functions that are not callbacks. If we eliminate hookname
>> completely, there is no way for libpq to know which private state we
>> are asking for.
>>
>
> Well, depending on a hook name for this is broken-by-design anyway,
> because there is no way for two independently written libraries to
> be sure they don't choose conflicting hook names. So the need for
> a hook name has to go away.
>
> It might work to use the address of the hook callback function as
> a key for retrieving the associated void * pointer. You'd need to
> not register the same callback function more than once per object,
> but from what I gather here you don't need to.
>
>
>

Or else have the library return a unique handle when registering hooks,
rather than supplying a hook name.

cheers

andrew