/[meteor]/googlecode.com/svn/trunk/Meteor/Channel.pm
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /googlecode.com/svn/trunk/Meteor/Channel.pm

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Revision 25 - (show annotations)
Sun May 20 19:40:53 2007 UTC (13 years, 1 month ago) by knops.gerd
File size: 6796 byte(s)
• Add simple statistics, available via new SHOWSTATS controller command

1 #!/usr/bin/perl -w
2 ###############################################################################
3 # Meteor
4 # An HTTP server for the 2.0 web
5 # Copyright (c) 2006 contributing authors
6 #
7 # Subscriber.pm
8 #
9 # Description:
10 # A Meteor Channel
11 #
12 ###############################################################################
13 #
14 # This program is free software; you can redistribute it and/or modify it
15 # under the terms of the GNU General Public License as published by the Free
16 # Software Foundation; either version 2 of the License, or (at your option)
17 # any later version.
18 #
19 # This program is distributed in the hope that it will be useful, but WITHOUT
20 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
21 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
22 # more details.
23 #
24 # You should have received a copy of the GNU General Public License along
25 # with this program; if not, write to the Free Software Foundation, Inc.,
26 # 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #
28 # For more information visit www.meteorserver.org
29 #
30 ###############################################################################
31
32 package Meteor::Channel;
33 ###############################################################################
34 # Configuration
35 ###############################################################################
36
37 use strict;
38
39 use Meteor::Message;
40
41 our %Channels=();
42 our $MessageID=0;
43
44 ###############################################################################
45 # Class methods
46 ###############################################################################
47 sub channelWithName {
48 my $class=shift;
49 my $channelName=shift;
50 my $avoidCreation=shift;
51
52 unless(exists($Channels{$channelName}))
53 {
54 return undef if($avoidCreation);
55 #
56 # Create new channel
57 #
58 $Channels{$channelName}=$class->newChannel($channelName);
59
60 &::syslog('debug',"New channel $channelName");
61 }
62
63 return $Channels{$channelName};
64 }
65
66 sub listChannels {
67 my $class=shift;
68
69 my $list='';
70 foreach my $channelName (sort keys %Channels)
71 {
72 my $channel=$Channels{$channelName};
73
74 $list.=$channelName.'('.$channel->messageCount().'/'.$channel->subscriberCount().")$::CRLF";
75 }
76
77 $list;
78 }
79
80 sub deleteChannel {
81 my $class=shift;
82 my $channelName=shift;
83
84 delete($Channels{$channelName});
85 }
86
87 sub trimMessageStoresByTimestamp {
88 my $class=shift;
89 my $minTimeStamp=shift;
90
91 return unless($minTimeStamp);
92
93 map { $_->trimMessageStoreByTimestamp($minTimeStamp) } (values %Channels);
94 }
95
96 sub clearAllBuffers {
97 my $class=shift;
98
99 map { $_->clearBuffer() } (values %Channels);
100 }
101
102 sub numChannels {
103
104 return scalar(keys %Channels);
105 }
106
107 ###############################################################################
108 # Factory methods
109 ###############################################################################
110 sub new {
111 #
112 # Create a new empty instance
113 #
114 my $class=shift;
115
116 my $obj={};
117
118 bless($obj,$class);
119 }
120
121 sub newChannel {
122 #
123 # new instance from new server connection
124 #
125 my $self=shift->new();
126
127 my $name=shift;
128 $self->{'name'}=$name;
129
130 $self->{'subscribers'}=[];
131 $self->{'messages'}=[];
132
133 $self;
134 }
135
136 sub DESTROY {
137 my $self=shift;
138
139 my @subscribers=@{$self->{'subscribers'}};
140 map { $_->closeChannel($self->{'name'}) } @subscribers;
141 }
142
143 ###############################################################################
144 # Instance methods
145 ###############################################################################
146 sub name {
147 shift->{'name'};
148 }
149
150 sub addSubscriber {
151 my $self=shift;
152 my $subscriber=shift;
153 my $startId=shift;
154 my $persist=shift;
155
156 # Note: negative $startId means go back that many messages
157
158 push(@{$self->{'subscribers'}},$subscriber) if($persist);
159
160 my $startIndex=$self->indexForMessageID($startId);
161 return unless(defined($startIndex));
162
163 my $msgCount=scalar(@{$self->{'messages'}});
164 my $txt='';
165
166 $startIndex=0 if($startIndex<0);
167
168 my $numMsgToSend=0;
169 while($startIndex<$msgCount)
170 {
171 my $message=$self->{'messages'}->[$startIndex++];
172
173 $txt.=$message->message();
174 $numMsgToSend++;
175 }
176
177 $subscriber->sendMessage($txt,$numMsgToSend);
178 }
179
180 sub removeSubscriber {
181 my $self=shift;
182 my $subscriber=shift;
183
184 my $idx=undef;
185 for(my $i=0;$i<scalar(@{$self->{'subscribers'}});$i++)
186 {
187 if($self->{'subscribers'}->[$i]==$subscriber)
188 {
189 $idx=$i;
190 last;
191 }
192 }
193
194 if(defined($idx))
195 {
196 splice(@{$self->{'subscribers'}},$idx,1);
197 }
198
199 $self->checkExpiration();
200 }
201
202 sub subscriberCount {
203 my $self=shift;
204
205 scalar(@{$self->{'subscribers'}});
206 }
207
208 sub addMessage {
209 my $self=shift;
210 my $messageText=shift;
211
212 my $message=Meteor::Message->newWithID($MessageID++);
213 $message->setText($messageText);
214 $message->setChannelName($self->{'name'});
215 push(@{$self->{'messages'}},$message);
216
217 $self->trimMessageStoreBySize();
218
219 my $text=$message->message();
220 map { $_->sendMessage($text) } @{$self->{'subscribers'}};
221 }
222
223 sub messageCount {
224 my $self=shift;
225
226 scalar(@{$self->{'messages'}});
227 }
228
229 sub trimMessageStoreBySize {
230 my $self=shift;
231
232 my $numMessages=scalar(@{$self->{'messages'}});
233
234 if($numMessages>$::CONF{'MaxMessagesPerChannel'})
235 {
236 splice(@{$self->{'messages'}},0,-$::CONF{'MaxMessagesPerChannel'});
237 }
238 }
239
240 sub trimMessageStoreByTimestamp {
241 my $self=shift;
242 my $ts=shift;
243
244 while(scalar(@{$self->{'messages'}})>0 && $self->{'messages'}->[0]->timestamp()<$ts)
245 {
246 my $msg=shift(@{$self->{'messages'}});
247 }
248
249 $self->checkExpiration();
250 }
251
252 sub clearBuffer {
253 my $self=shift;
254
255 $self->{'messages'}=[];
256
257 $self->checkExpiration();
258 }
259
260 sub checkExpiration {
261 my $self=shift;
262
263 if($self->messageCount()==0 && $self->subscriberCount()==0)
264 {
265 my $name=$self->name();
266 &::syslog('debug',"Channel expired: $name");
267 $self->deleteChannel($name);
268 }
269 }
270
271 sub indexForMessageID {
272 my $self=shift;
273 my $id=shift;
274
275 # the messages is always sorted by ID, so we can
276 # use a binary search to find the message.
277 # return undef if there are no messages or the
278 # ID is that of the last message.
279 # Otherwise return the ID of the found message
280 # of if no message with that ID exists the one
281 # with the next higher ID
282 #
283 return undef unless(defined($id));
284
285 my $numMessages=scalar(scalar(@{$self->{'messages'}}));
286
287 return undef unless($numMessages);
288 return -1 unless($id ne '');
289
290 # Note: negative $id means go back that many messages
291 return $numMessages+$id if($id<0);
292
293 my $low=0;
294 my $high=$numMessages-1;
295 my $mid;
296 my $cond;
297 while($low<=$high)
298 {
299 $mid=($low+$high)>>1;
300 $cond=$id <=> $self->{'messages'}->[$mid]->id();
301 if($cond<0)
302 {
303 $high=$mid-1;
304 }
305 elsif($cond>0)
306 {
307 $low=$mid+1;
308 }
309 else
310 {
311 return $mid;
312 }
313 }
314
315 return undef if($low>=$numMessages);
316
317 return $low;
318 }
319
320 1;
321 ############################################################################EOF

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