Re: [mh] How do Objects set themselves?

[Kevin R. K. <ke...@kr...>]

If you can, you probably want the state of the Master object to be set to
the recently changed unit_number, or at least to some state to note that a
new unit_number has been received.  If you do this, you can use the
"tie_event" routine to trigger your set routine to run.  It probably makes
sense for your master item and slave item objects to be different classes.

For example, something like this would work:

package Master_Item;

.......

sub master_event{
my ($self, $p_state) = @_;
if ($p_state eq 'SOME TEST'){
$$self{slave}->set($p_state);
}
}

package Slave_Item;

sub new {
my ($class,$master) = @_;
bless $self, $class;
$$self{master} = $master;
$$self{master}{slave} = $self;
$$self{master} -> tie_event ('$object->master_event("$state")');
return $self;
}

------

Anytime the state of the master object changes, master_event is run.  You
would obviously need to expand this so it could work with many slave items,
but that should be trivial.


On Mon, Nov 25, 2013 at 12:09 PM, H Plato <hp...@gm...> wrote:

> I'm probably missing something obvious, but it's been a while since I
> played with creating an object.
>
> I want to create a 'linked' type of object, that is one that will respond
> when a master object has changed. This master object listens to serial
> data, and will set it's internal structure based on what it sees. so when
>
> $unit= $object->unit_now method equals a value, that means that an
> activity has taken place with this particular unit.
> $object->unit_state($unit) method will give the state of that particular
> code
>
> So using examples, I can craft up an object package, however I'm unclear
> how to link in the set method such that it fires when $object->unit_now
> equals the unit number stored in the object. My rough outline is below, I
> appreciate any feedback or suggestions object creators may have:
>
> package test_item;
>
> @test_item::ISA = ('Base_Item');
>
> sub initialize
> {
>    my ($self,$object,$unit) = @_;
>
>    $$self{unit_number} = $unit;
>    $$self{master_object} = $object; #should be a reference to the original
> object, don't know if this syntax is correct
> }
>
> sub set
> {
>    my ($self,$p_state,$p_setby) = @_;
>
>     if (unit_now $self->{master_object} eq $self->{unit_number}) {
>        if ($self->{master_object}->unit_state($self->unit_number) =~
> /^series1/) {
>             $p_state = 'on';
>          } elsif ($self->{master_object}->unit_state($self->unit_number)
> =~ /^series2/) {
>             $p_state = 'off';
>          }
>  }
>
>     $self->SUPER::set($p_state,$p_setby);
> }
>
>
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