Thanks Michael,
I'll definitely add the config - pretty much sorted out the singleton (except for the change of directory).  Just wondering if I should rebase this change down earlier or just keep it as the 'last change' that is making the final break.  It might be a better transition that way?

Anyway have a look at this little class below; we have a bunch of different implementations for an event register and came up with the OvmsCallBackRegister below.

In my example the event notification looks like this:
    void PollRunFinished(canbus *bus)
      {
      m_runfinished_callback.Call(
        [bus](const std::string &name, const PollCallback &cb)
          {
          cb(bus, nullptr);
          });
    }

I could possibly but it in main/ovms_utils.h  ??  It could also use a std:map to implement it, though I think we save space this way and tbh the use case wouldn't be doing a lot of Register and Unregister which would be the slowest operations...   I've made it not shrink the list size .... but again, not that important in the context.

Thoughts?

//.ichael
--------------8< -----------------------------------
/* Call-back register.
 * The list does not shrink which is fine for this use-case.
 * Can be made inexpensively threadsafe/re-entrant safe.
 */
template <typename FN>
class OvmsCallBackRegister
  {
  private:
  class CallbackEntry
    {
    public:
      CallbackEntry(const std::string &caller, FN callback)
        {
        m_name = caller;
        m_callback = callback;
        }
      ~CallbackEntry() {}
    public:
      std::string m_name;
      FN m_callback;
    };
    typedef std::forward_list<CallbackEntry> callbacklist_t;
    callbacklist_t m_list;
  public:
    ~OvmsCallBackRegister()
      {
      }
    void Register(const std::string &nametag, FN callback)
      {
      // Replace
      for (auto it = m_list.begin(); it != m_list.end(); ++it)
        {
        if ((*it).m_name == nametag)
          {
          (*it).m_callback = callback;
          return;
          }
        }
      if (!callback)
        return;
      for (auto it = m_list.begin(); it != m_list.end(); ++it)
        {
        if (!(*it).m_callback)
          {
          CallbackEntry &entry = *it;
          entry.m_name = nametag;
          entry.m_callback = callback;
          return;
          }
        }
      m_list.push_front(CallbackEntry(nametag, callback));
      }
    void Deregister(const std::string &nametag)
      {
      Register(nametag, nullptr);
      }
    typedef std::function<void (const std::string &nametag, FN callback)> visit_fn_t;
    void Call(visit_fn_t visit)
      {
      for (auto it = m_list.begin(); it != m_list.end(); ++it)
        {
        const CallbackEntry &entry = *it;
        if (entry.m_callback)
          visit(entry.m_name, entry.m_callback);
        }
      }
  };

On Thu, 14 Mar 2024 at 12:08, Mark Webb-Johnson <mark@webb-johnson.net> wrote:
Michael,

I suggest that if it is a separate component then better to move it to it’s own component directory (just as canopen is done).

For completeness, I suggest it would also be good to include a CONFIG_OVMS_COMP_* sdkconfig (default: yes), and put that as a requirement for your component (as well as for any vehicle doing polling, I guess).

Regards, Mark

On 14 Mar 2024, at 11:01 AM, Michael Geddes <frog@bunyip.wheelycreek.net> wrote:

Thanks Michael, Mark,

Sorry for not acknowledging earlier.. this feedback is great; I've just been cogitating on the consequences. 

I still have the Poller hanging onto the vehicle by a thread so I should just cut the thread making the Poller a separate singleton (it's still embedded in the vehicle class for now with a small interface joining them).

If I do, does it need to get moved to a new directory or can it stay in the vehicle/ directory?  The file vehicle_poller.cpp (and the _isotp and vwtp parts to it) are still pretty much as they were with only a change in class name..

I think I just need the poller to get its own values of m_can1 etc and provide a different way of getting the feedback results.

I also need to make sure I'm not cutting off the 'vehicle' class' access to non-solicited messages (ie stuff that is just on the bus).

//.ichael


On Mon, 11 Mar 2024 at 14:51, Michael Balzer <dexter@expeedo.de> wrote:
Actually, separating the poller from the vehicle was part of the plan of reworking it into a job/worker architecture. I see no reason the generalized poller would need to remain coupled to the vehicle.

That's why I placed the OBD single request command in the "obdii" hierarchy (although a more proper naming would have been e.g. "isotp", but changing the name or having both would confuse users -- and meanwhile the poller also supports a non-ISO TP variant).

Regards,
Michael


Am 11.03.24 um 00:51 schrieb Mark Webb-Johnson:
Michael,

It depends on whether the poller can *only* be used in the vehicle class or if it is a framework all by itself (for example with commands to manually poll specific PIDs, etc).

If *only* within vehicle framework, then putting it as a sub-command under ‘vehicle’ seems sensible.

If more general purpose, then perhaps look at ‘copen’ (component/canopen) as an example.

Regards, Mark.

On 10 Mar 2024, at 7:25 AM, Michael Geddes <frog@bunyip.wheelycreek.net> wrote:

Hi all,

I know some of this (especially for the status) functionality is predicated on code that's not gone up yet - however this is allowing 'pause' and 'resume' of the poller (which has been merged).
My question is not so much about the functionality and status information, but about the location of the poller subcommand. (See below). 

Should 'vehicle' be exclusively for switching the vehicle type?  Should the 'poller' command be top-level?  Under obdii?  

Thoughts welcome.
If you do  vehicle poller pause  then the last line reads  'Vehicle OBD Polling is paused'
//.
-------8<----------------------------------------

OVMS# vehicle ?
Usage: vehicle [list|module|poller|status]
list                 Show list of available vehicle modules
module               Set (or clear) vehicle module
poller               OBD polling status
status               Show vehicle module status
OVMS# vehicle poller ?
Usage: vehicle poller [pause|resume]
pause                Pause OBD Polling
resume               Resume OBD Polling
OVMS# vehicle poller
OBD Polling running on bus 1 with an active list
Time between polling ticks is 1000ms with 1 secondary sub-ticks
Last poll command received 1s (ticks) ago.
Vehicle OBD Polling is running.
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