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# |
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# Copyright 2007-2010 David Snopek <dsnopek@gmail.com> |
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# |
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# This program is free software: you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation, either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program. If not, see <http://www.gnu.org/licenses/>. |
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# |
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package POE::Component::MessageQueue::Queue; |
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use POE; |
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use POE::Session; |
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use Moose; |
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with qw(POE::Component::MessageQueue::Destination); |
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sub flag { has $_[0] => (is => 'rw', default => 0) } |
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flag 'pumping'; |
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flag 'pump_pending'; |
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flag 'shutting_down'; |
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sub stash { |
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my $n = $_[0]; |
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has $n => ( |
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is => 'rw', |
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isa => 'HashRef', |
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default => sub { {} }, |
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traits => ['Hash'], |
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handles => { |
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"set_$n" => 'set', |
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"del_$n" => 'delete', |
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"${n}_keys" => 'keys', |
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} |
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); |
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} |
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stash 'waiting'; |
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stash 'serviced'; |
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sub next_subscriber |
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{ |
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my $self = $_[0]; |
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if (my @keys = $self->waiting_keys) |
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{ |
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my $id = pop(@keys); |
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my $s = $self->del_waiting($id); |
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if($s->client) |
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{ |
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$self->set_serviced($id, $s); |
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return $s; |
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} |
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else |
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{ |
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$self->delete_subscription($id); |
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return $self->next_subscriber; |
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} |
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} |
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else |
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{ |
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my $serviced = $self->serviced; |
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$self->serviced($self->waiting); |
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$self->waiting($serviced); |
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return (keys %$serviced) && $self->next_subscriber; |
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} |
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} |
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sub next_ready |
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{ |
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my $self = $_[0]; |
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my ($s, %seen); |
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while ($s = $self->next_subscriber and !exists $seen{$s}) |
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{ |
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return $s if $s->ready; |
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$seen{$s} = 1; |
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} |
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return; |
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} |
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after set_subscription => __PACKAGE__->can('set_waiting'); |
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after delete_subscription => sub { |
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my ($self, @args) = @_; |
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$self->del_waiting(@args); |
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$self->del_serviced(@args); |
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}; |
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__PACKAGE__->meta->make_immutable(); |
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sub BUILD |
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{ |
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my ($self, $args) = @_; |
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POE::Session->create( |
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object_states => [ $self => [qw(_start _shutdown _pump_state _pump_timer)]], |
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); |
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} |
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sub _start |
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{ |
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my ($self, $kernel) = @_[OBJECT, KERNEL]; |
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$kernel->alias_set($self->name); |
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$kernel->delay(_pump_timer => $self->parent->pump_frequency) |
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if ($self->parent->pump_frequency); |
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} |
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sub shutdown { |
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my $self = $_[0]; |
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$self->shutting_down(1); |
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$poe_kernel->post($self->name, '_shutdown') |
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} |
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sub _shutdown |
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{ |
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my ($self, $kernel) = @_[OBJECT, KERNEL]; |
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$kernel->alias_remove($self->name); |
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$kernel->alarm_remove_all(); |
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} |
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128
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# This is the pumping philosophy: When we receive a pump request, we will |
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# give everyone a chance to claim a message. If any pumps are asked for while |
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# this is happening, we will remember and do another pump when this one is |
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# finished (just one). |
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# This means we're serializing claim and retrieve requests. More work needs |
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# to be done to determine whether this is good or necessary. |
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sub is_persistent { return 1 } |
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sub _pump_state |
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{ |
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my $self = $_[OBJECT]; |
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return if $self->shutting_down; |
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if (my $s = $self->next_ready) |
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{ |
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$s->ready(0); |
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$self->storage->claim_and_retrieve($self->name, $s->client->id, sub { |
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if (my $msg = $_[0]) |
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{ |
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$self->dispatch_message($msg, $s); |
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$poe_kernel->post($self->name, '_pump_state'); |
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} |
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else |
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{ |
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$s->ready(1); |
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$self->_done_pumping(); |
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} |
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}); |
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} |
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else |
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{ |
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$self->_done_pumping(); |
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} |
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} |
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sub _done_pumping |
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{ |
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my $self = $_[0]; |
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$self->pumping(0); |
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$self->pump() if $self->pump_pending; |
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} |
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sub _pump_timer |
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{ |
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my ($self, $kernel) = @_[OBJECT, KERNEL]; |
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return if $self->shutting_down; |
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# pump (the 1 means that we won't set pump_pending if |
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# we are already in a pumping state). |
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$self->pump(1); |
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$kernel->delay(_pump_timer => $self->parent->pump_frequency); |
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} |
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sub pump |
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{ |
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my ($self, $skip_pending) = @_; |
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if($self->pumping and not $skip_pending) |
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{ |
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$self->pump_pending(1); |
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} |
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else |
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{ |
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$self->log(debug => ' -- PUMP QUEUE: '.$self->name.' -- '); |
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$self->notify('pump'); |
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$self->pump_pending(0); |
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$self->pumping(1); |
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$poe_kernel->call($self->name, '_pump_state'); |
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} |
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} |
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203
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sub send |
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{ |
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my ($self, $message) = @_; |
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return if $self->shutting_down; |
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208
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# If we already have a ready subscriber, we'll dispatch before we |
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# store to give the subscriber a headstart on processing. |
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if (not $message->has_delay and my $s = $self->next_ready) |
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{ |
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my $mid = $message->id; |
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my $cid = $s->client->id; |
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if ($s->client_ack) |
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{ |
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$message->claim($cid); |
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$self->log(info => "QUEUE: Message $mid claimed by $cid during send"); |
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$self->storage->store($message); |
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$self->notify(store => $message); |
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} |
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else |
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{ |
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$self->log(info => "QUEUE: Message $mid not stored, sent to $cid"); |
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} |
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$self->dispatch_message($message, $s); |
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} |
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else |
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{ |
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$self->storage->store($message, sub { |
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$self->notify(store => $message); |
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$self->pump(); |
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}); |
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} |
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} |
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236
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1; |
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