/[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 46 - (show annotations)
Mon Feb 4 19:24:25 2008 UTC (16 years, 1 month ago) by knops.gerd
File size: 7600 byte(s)
• The ADDMESSAGE response now follows the `OK` with a tab character and the message ID for the newly added message

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 listChannelsUsingTemplate {
81 my $class=shift;
82 my $template=shift;
83
84 return '' unless(defined($template) && $template ne '');
85
86 my $list='';
87 foreach my $channelName (sort keys %Channels)
88 {
89 my $channel=$Channels{$channelName};
90
91 $list.=$channel->descriptionWithTemplate($template);
92 }
93
94 $list;
95 }
96
97 sub deleteChannel {
98 my $class=shift;
99 my $channelName=shift;
100
101 delete($Channels{$channelName});
102 }
103
104 sub trimMessageStoresByTimestamp {
105 my $class=shift;
106 my $minTimeStamp=shift;
107
108 return unless($minTimeStamp);
109
110 map { $_->trimMessageStoreByTimestamp($minTimeStamp) } (values %Channels);
111 }
112
113 sub clearAllBuffers {
114 my $class=shift;
115
116 map { $_->clearBuffer() } (values %Channels);
117 }
118
119 sub numChannels {
120
121 return scalar(keys %Channels);
122 }
123
124 ###############################################################################
125 # Factory methods
126 ###############################################################################
127 sub new {
128 #
129 # Create a new empty instance
130 #
131 my $class=shift;
132
133 my $obj={};
134
135 bless($obj,$class);
136 }
137
138 sub newChannel {
139 #
140 # new instance from new server connection
141 #
142 my $self=shift->new();
143
144 my $name=shift;
145 $self->{'name'}=$name;
146
147 $self->{'subscribers'}=[];
148 $self->{'messages'}=[];
149
150 $self;
151 }
152
153 sub DESTROY {
154 my $self=shift;
155
156 my @subscribers=@{$self->{'subscribers'}};
157 map { $_->closeChannel($self->{'name'}) } @subscribers;
158 }
159
160 ###############################################################################
161 # Instance methods
162 ###############################################################################
163 sub name {
164 shift->{'name'};
165 }
166
167 sub addSubscriber {
168 my $self=shift;
169 my $subscriber=shift;
170 my $startId=shift;
171 my $persist=shift;
172
173 # Note: negative $startId means go back that many messages
174
175 push(@{$self->{'subscribers'}},$subscriber) if($persist);
176
177 my $startIndex=$self->indexForMessageID($startId);
178 return unless(defined($startIndex));
179
180 my $msgCount=scalar(@{$self->{'messages'}});
181 my $txt='';
182
183 $startIndex=0 if($startIndex<0);
184
185 if($startIndex<$msgCount)
186 {
187 $subscriber->sendMessages(@{$self->{'messages'}}[$startIndex,$msgCount-1]);
188 }
189 }
190
191 sub removeSubscriber {
192 my $self=shift;
193 my $subscriber=shift;
194
195 my $idx=undef;
196 for(my $i=0;$i<scalar(@{$self->{'subscribers'}});$i++)
197 {
198 if($self->{'subscribers'}->[$i]==$subscriber)
199 {
200 $idx=$i;
201 last;
202 }
203 }
204
205 if(defined($idx))
206 {
207 splice(@{$self->{'subscribers'}},$idx,1);
208 }
209
210 $self->checkExpiration();
211 }
212
213 sub subscriberCount {
214 my $self=shift;
215
216 scalar(@{$self->{'subscribers'}});
217 }
218
219 sub addMessage {
220 my $self=shift;
221 my $messageText=shift;
222
223 my $message=Meteor::Message->newWithID($MessageID++);
224 $message->setText($messageText);
225 $message->setChannelName($self->{'name'});
226 push(@{$self->{'messages'}},$message);
227
228 $self->trimMessageStoreBySize();
229
230 map { $_->sendMessages($message) } @{$self->{'subscribers'}};
231
232 $message;
233 }
234
235 sub messageCount {
236 my $self=shift;
237
238 scalar(@{$self->{'messages'}});
239 }
240
241 sub trimMessageStoreBySize {
242 my $self=shift;
243
244 my $numMessages=scalar(@{$self->{'messages'}});
245
246 if($numMessages>$::CONF{'MaxMessagesPerChannel'})
247 {
248 splice(@{$self->{'messages'}},0,-$::CONF{'MaxMessagesPerChannel'});
249 }
250 }
251
252 sub trimMessageStoreByTimestamp {
253 my $self=shift;
254 my $ts=shift;
255
256 while(scalar(@{$self->{'messages'}})>0 && $self->{'messages'}->[0]->timestamp()<$ts)
257 {
258 my $msg=shift(@{$self->{'messages'}});
259 }
260
261 $self->checkExpiration();
262 }
263
264 sub clearBuffer {
265 my $self=shift;
266
267 $self->{'messages'}=[];
268
269 $self->checkExpiration();
270 }
271
272 sub checkExpiration {
273 my $self=shift;
274
275 if($self->messageCount()==0 && $self->subscriberCount()==0)
276 {
277 my $name=$self->name();
278 &::syslog('debug',"Channel expired: $name");
279 $self->deleteChannel($name);
280 }
281 }
282
283 sub indexForMessageID {
284 my $self=shift;
285 my $id=shift;
286
287 # the messages is always sorted by ID, so we can
288 # use a binary search to find the message.
289 # return undef if there are no messages or the
290 # ID is that of the last message.
291 # Otherwise return the ID of the found message
292 # of if no message with that ID exists the one
293 # with the next higher ID
294 #
295 return undef unless(defined($id));
296
297 my $numMessages=scalar(@{$self->{'messages'}});
298
299 return undef unless($numMessages);
300 return -1 unless($id ne '');
301
302 # Note: negative $id means go back that many messages
303 return $numMessages+$id if($id<0);
304
305 my $low=0;
306 my $high=$numMessages-1;
307 my $mid;
308 my $cond;
309 while($low<=$high)
310 {
311 $mid=($low+$high)>>1;
312 $cond=$id <=> $self->{'messages'}->[$mid]->id();
313 if($cond<0)
314 {
315 $high=$mid-1;
316 }
317 elsif($cond>0)
318 {
319 $low=$mid+1;
320 }
321 else
322 {
323 return $mid;
324 }
325 }
326
327 return undef if($low>=$numMessages);
328
329 return $low;
330 }
331
332 sub lastMsgID {
333 my $self=shift;
334
335 my $numMessages=scalar(@{$self->{'messages'}});
336
337 return 'undefined' unless($numMessages>0);
338
339 @{$self->{'messages'}}[-1]->id();
340 }
341
342 sub descriptionWithTemplate {
343 my $self=shift;
344 my $template=shift;
345
346 $template=~s/~([a-zA-Z0-9_]*)~/
347 if(!defined($1) || $1 eq '')
348 {
349 '~';
350 }
351 elsif($1 eq 'messageCount')
352 {
353 $self->messageCount();
354 }
355 elsif($1 eq 'subscriberCount')
356 {
357 $self->subscriberCount();
358 }
359 elsif($1 eq 'lastMsgID')
360 {
361 $self->lastMsgID();
362 }
363
364 elsif(exists($self->{$1}))
365 {
366 $self->{$1};
367 }
368 else
369 {
370 '';
371 }
372 /gex;
373
374 $template;
375 }
376
377 1;
378 ############################################################################EOF

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