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EventDispatcher: store event handlers in priority queue

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Pragmatic Software 2021-07-18 18:23:42 -07:00
parent d380422d14
commit b970ee9aa6
1 changed files with 28 additions and 10 deletions
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38
lib/PBot/EventDispatcher.pm
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@ -12,6 +12,8 @@ use parent 'PBot::Class';
use PBot::Imports;
use PBot::Utils::PriorityQueue;
sub initialize {
my ($self, %conf) = @_;
@ -21,7 +23,7 @@ sub initialize {
# add an event handler
sub register_handler {
my ($self, $event_name, $subref) = @_;
my ($self, $event_name, $subref, $priority) = @_;
# get the package of the calling subroutine
my ($package) = caller(0);
@ -29,8 +31,19 @@ sub register_handler {
# internal identifier to find calling package's event handler
my $handler_id = "$package-$event_name";
my $entry = {
priority => $priority // 50,
id => $handler_id,
subref => $subref,
};
# create new priority-queue for event-name if one doesn't exist
if (not exists $self->{handlers}->{$event_name}) {
$self->{handlers}->{$event_name} = PBot::Utils::PriorityQueue->new(pbot => $self->{pbot});
}
# add the event handler
$self->{handlers}->{$event_name}->{$handler_id} = $subref;
$self->{handlers}->{$event_name}->add($entry);
# debugging
if ($self->{pbot}->{registry}->get_value('eventdispatcher', 'debug')) {
@ -50,10 +63,18 @@ sub remove_handler {
# remove the event handler
if (exists $self->{handlers}->{$event_name}) {
delete $self->{handlers}->{$event_name}->{$handler_id};
my $handlers = $self->{handlers}->{$event_name};
for (my $i = 0; $i < $handlers->count; $i++) {
my $handler = $handlers->get($i);
if ($handler->{id} eq $handler_id) {
$handlers->remove($i--);
}
}
# remove root event-name key if it has no more handlers
if (not keys %{$self->{handlers}->{$event_name}}) {
if (not $self->{handlers}->{$event_name}->count) {
delete $self->{handlers}->{$event_name};
}
}
@ -77,18 +98,15 @@ sub dispatch_event {
# if the event-name has handlers
if (exists $self->{handlers}->{$event_name}) {
# then dispatch the event to each one
foreach my $handler_id (keys %{$self->{handlers}->{$event_name}}) {
# get event handler subref
my $subref = $self->{handlers}->{$event_name}->{$handler_id};
foreach my $handler ($self->{handlers}->{$event_name}->entries) {
# debugging
if ($debug) {
$self->{pbot}->{logger}->log("Dispatching $event_name to handler $handler_id\n");
$self->{pbot}->{logger}->log("Dispatching $event_name to handler $handler->{id}\n");
}
# invoke an event handler. a handler may return undef to indicate
# that it decided not to handle this event.
my $handler_result = eval { $subref->($event_name, $event_data) };
my $handler_result = eval { $handler->{subref}->($event_name, $event_data) };
# update $dispatch_result only when handler result is a defined
# value so we remember if any handlers have handled this event.