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Add some comments about priority levels

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Pragmatic Software 2021-07-19 10:49:42 -07:00
parent 354f278cb2
commit 9890ca99ee
2 changed files with 22 additions and 7 deletions
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16
lib/PBot/EventDispatcher.pm
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@ -22,6 +22,14 @@ sub initialize {
}
# add an event handler
#
# priority ranges from 0 to 100. 0 is the highest priority, i.e. an handler with
# priority 0 will handle events first. 100 is the lowest priority and will handle
# events last. priority defaults to 50 if ommited.
#
# NickList reserves 0 and 100 to ensure its list is populated by JOINs, etc,
# before any handlers need to consult its list, or depopulated by PARTs, QUITs,
# KICKs, etc, after any other handlers need to consult its list.
sub register_handler {
my ($self, $event_name, $subref, $priority) = @_;
@ -108,13 +116,13 @@ sub dispatch_event {
# that it decided not to handle this event.
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.
$dispatch_result = $handler_result if defined $handler_result;
# check for exception
if (my $exception = $@) {
$self->{pbot}->{logger}->log("Exception in event handler: $exception");
} else {
# update $dispatch_result only when handler result is a defined
# value so we remember if any handlers have handled this event.
$dispatch_result = $handler_result if defined $handler_result;
}
}
}

13
lib/PBot/NickList.pm
View File

@ -34,19 +34,26 @@ sub initialize {
$self->{pbot}->{commands}->register(sub { $self->cmd_nicklist(@_) }, "nicklist", 1);
# handlers for various IRC events
# TODO: track mode changes to update user flags
# Update: turns out that IRCHandler's on_mode() is doing this already -- we need to make that
# emit a mode-change event or some such and register a handler for it here.
# lowest priority so these get handled by NickList before any other handlers
# (all other handlers should be given a priority > 0)
$self->{pbot}->{event_dispatcher}->register_handler('irc.namreply', sub { $self->on_namreply(@_) }, 0 );
$self->{pbot}->{event_dispatcher}->register_handler('irc.join', sub { $self->on_join(@_) }, 0 );
$self->{pbot}->{event_dispatcher}->register_handler('irc.public', sub { $self->on_activity(@_) }, 0 );
$self->{pbot}->{event_dispatcher}->register_handler('irc.caction', sub { $self->on_activity(@_) }, 0 );
# highest priority so these get handled by NickList after all other handlers
# (all other handlers should be given a priority < 100)
$self->{pbot}->{event_dispatcher}->register_handler('irc.part', sub { $self->on_part(@_) }, 100 );
$self->{pbot}->{event_dispatcher}->register_handler('irc.quit', sub { $self->on_quit(@_) }, 100 );
$self->{pbot}->{event_dispatcher}->register_handler('irc.kick', sub { $self->on_kick(@_) }, 100 );
$self->{pbot}->{event_dispatcher}->register_handler('irc.nick', sub { $self->on_nickchange(@_) }, 100 );
$self->{pbot}->{event_dispatcher}->register_handler('irc.public', sub { $self->on_activity(@_) }, 0 );
$self->{pbot}->{event_dispatcher}->register_handler('irc.caction', sub { $self->on_activity(@_) }, 0 );
# handlers for the bot itself joining/leaving channels
# handlers for the bot itself joining/leaving channels (lowest priority)
$self->{pbot}->{event_dispatcher}->register_handler('pbot.join', sub { $self->on_self_join(@_) }, 0);
$self->{pbot}->{event_dispatcher}->register_handler('pbot.part', sub { $self->on_self_part(@_) }, 0);
}