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andrew.betts |
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#!/usr/bin/perl -w |
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############################################################################### |
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# Meteor |
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# An HTTP server for the 2.0 web |
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# Copyright (c) 2006 contributing authors |
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# |
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# Subscriber.pm |
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# |
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# Description: |
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# A Meteor Channel |
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# |
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############################################################################### |
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# |
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# This program is free software; you can redistribute it and/or modify it |
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# under the terms of the GNU General Public License as published by the Free |
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# Software Foundation; either version 2 of the License, or (at your option) |
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# any later version. |
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# |
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# This program is distributed in the hope that it will be useful, but WITHOUT |
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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# more details. |
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# |
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# You should have received a copy of the GNU General Public License along |
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# with this program; if not, write to the Free Software Foundation, Inc., |
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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# |
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# For more information visit www.meteorserver.org |
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# |
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############################################################################### |
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package Meteor::Channel; |
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############################################################################### |
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# Configuration |
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############################################################################### |
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use strict; |
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use Meteor::Message; |
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our %Channels=(); |
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our $MessageID=0; |
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############################################################################### |
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# Class methods |
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############################################################################### |
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sub channelWithName { |
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my $class=shift; |
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my $channelName=shift; |
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my $avoidCreation=shift; |
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unless(exists($Channels{$channelName})) |
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{ |
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return undef if($avoidCreation); |
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# |
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# Create new channel |
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# |
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$Channels{$channelName}=$class->newChannel($channelName); |
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&::syslog('debug',"New channel $channelName"); |
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} |
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return $Channels{$channelName}; |
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} |
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sub listChannels { |
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my $class=shift; |
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my $list=''; |
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foreach my $channelName (sort keys %Channels) |
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{ |
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my $channel=$Channels{$channelName}; |
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$list.=$channelName.'('.$channel->messageCount().'/'.$channel->subscriberCount().")$::CRLF"; |
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} |
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$list; |
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} |
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sub deleteChannel { |
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my $class=shift; |
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my $channelName=shift; |
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delete($Channels{$channelName}); |
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} |
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sub trimMessageStoresByTimestamp { |
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my $class=shift; |
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my $minTimeStamp=shift; |
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return unless($minTimeStamp); |
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map { $_->trimMessageStoreByTimestamp($minTimeStamp) } (values %Channels); |
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} |
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sub clearAllBuffers { |
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my $class=shift; |
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map { $_->clearBuffer() } (values %Channels); |
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} |
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############################################################################### |
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# Factory methods |
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############################################################################### |
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sub new { |
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# |
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# Create a new empty instance |
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# |
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my $class=shift; |
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my $obj={}; |
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bless($obj,$class); |
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} |
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sub newChannel { |
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# |
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# new instance from new server connection |
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# |
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my $self=shift->new(); |
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my $name=shift; |
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$self->{'name'}=$name; |
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$self->{'subscribers'}=[]; |
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$self->{'messages'}=[]; |
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$self; |
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} |
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sub DESTROY { |
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my $self=shift; |
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my @subscribers=@{$self->{'subscribers'}}; |
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map { $_->close() } @subscribers; |
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} |
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############################################################################### |
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# Instance methods |
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############################################################################### |
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sub name { |
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shift->{'name'}; |
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} |
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sub addSubscriber { |
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my $self=shift; |
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my $subscriber=shift; |
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my $startId=shift; |
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my $persist=shift; |
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# Note: negative $startId means go back that many messages |
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push(@{$self->{'subscribers'}},$subscriber) if($persist); |
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my $startIndex=$self->indexForMessageID($startId); |
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return unless(defined($startIndex)); |
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my $msgCount=scalar(@{$self->{'messages'}}); |
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my $txt=''; |
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$startIndex=0 if($startIndex<0); |
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while($startIndex<$msgCount) |
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{ |
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my $message=$self->{'messages'}->[$startIndex++]; |
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$txt.=$message->message(); |
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} |
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$subscriber->sendMessage($txt); |
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} |
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sub removeSubscriber { |
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my $self=shift; |
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my $subscriber=shift; |
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my $idx=undef; |
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for(my $i=0;$i<scalar(@{$self->{'subscribers'}});$i++) |
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{ |
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if($self->{'subscribers'}->[$i]==$subscriber) |
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{ |
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$idx=$i; |
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last; |
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} |
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} |
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if(defined($idx)) |
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{ |
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splice(@{$self->{'subscribers'}},$idx,1); |
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} |
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$self->checkExpiration(); |
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} |
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sub subscriberCount { |
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my $self=shift; |
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scalar(@{$self->{'subscribers'}}); |
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} |
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sub addMessage { |
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my $self=shift; |
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my $messageText=shift; |
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my $message=Meteor::Message->newWithID($MessageID++); |
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$message->setText($messageText); |
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push(@{$self->{'messages'}},$message); |
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$self->trimMessageStoreBySize(); |
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my $text=$message->message(); |
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map { $_->sendMessage($text) } @{$self->{'subscribers'}}; |
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} |
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sub messageCount { |
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my $self=shift; |
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scalar(@{$self->{'messages'}}); |
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} |
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sub trimMessageStoreBySize { |
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my $self=shift; |
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my $numMessages=scalar(@{$self->{'messages'}}); |
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if($numMessages>$::CONF{'MaxMessagesPerChannel'}) |
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{ |
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splice(@{$self->{'messages'}},0,-$::CONF{'MaxMessagesPerChannel'}); |
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} |
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} |
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sub trimMessageStoreByTimestamp { |
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my $self=shift; |
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my $ts=shift; |
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while(scalar(@{$self->{'messages'}})>0 && $self->{'messages'}->[0]->timestamp()<$ts) |
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{ |
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my $msg=shift(@{$self->{'messages'}}); |
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} |
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$self->checkExpiration(); |
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} |
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sub clearBuffer { |
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my $self=shift; |
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$self->{'messages'}=[]; |
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$self->checkExpiration(); |
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} |
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sub checkExpiration { |
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my $self=shift; |
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if($self->messageCount()==0 && $self->subscriberCount()==0) |
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{ |
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my $name=$self->name(); |
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&::syslog('debug',"Channel expired: $name"); |
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$self->deleteChannel($name); |
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} |
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} |
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sub indexForMessageID { |
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my $self=shift; |
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my $id=shift; |
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# the messages is always sorted by ID, so we can |
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# use a binary search to find the message. |
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# return undef if there are no messages or the |
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# ID is that of the last message. |
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# Otherwise return the ID of the found message |
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# of if no message with that ID exists the one |
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# with the next higher ID |
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# |
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return undef unless(defined($id)); |
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my $numMessages=scalar(scalar(@{$self->{'messages'}})); |
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return undef unless($numMessages); |
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return -1 unless($id ne ''); |
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# Note: negative $id means go back that many messages |
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return $numMessages+$id if($id<0); |
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my $low=0; |
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my $high=$numMessages-1; |
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my $mid; |
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my $cond; |
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while($low<=$high) |
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{ |
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$mid=($low+$high)>>1; |
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$cond=$id <=> $self->{'messages'}->[$mid]->id(); |
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if($cond<0) |
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{ |
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$high=$mid-1; |
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} |
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elsif($cond>0) |
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{ |
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$low=$mid+1; |
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} |
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else |
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{ |
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return $mid; |
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} |
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} |
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return undef if($low>=$numMessages); |
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return $low; |
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} |
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1; |
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############################################################################EOF |