/[webpac2]/trunk/lib/WebPAC/Input.pm
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revision 1 by dpavlin, Sat Jun 25 20:23:23 2005 UTC revision 9 by dpavlin, Sat Jul 16 17:14:43 2005 UTC
# Line 5  use strict; Line 5  use strict;
5    
6  =head1 NAME  =head1 NAME
7    
8  WebPAC::Input - The great new WebPAC::Input!  WebPAC::Input - core module for input file format
9    
10  =head1 VERSION  =head1 VERSION
11    
# Line 17  our $VERSION = '0.01'; Line 17  our $VERSION = '0.01';
17    
18  =head1 SYNOPSIS  =head1 SYNOPSIS
19    
20  Quick summary of what the module does.  This module will load particular loader module and execute it's functions.
21    
22  Perhaps a little code snippet.  Perhaps a little code snippet.
23    
24      use WebPAC::Input;      use WebPAC::Input;
25    
26      my $foo = WebPAC::Input->new();      my $db = WebPAC::Input->new(
27      ...          format => 'NULL',
28            config => $config,
29            lookup => $lookup_obj,
30        );
31    
32        $db->open('/path/to/database');
33        print "database size: ",$db->size,"\n";
34        while (my $row = $db->fetch) {
35            ...
36        }
37        $db->close;
38    
39  =head1 EXPORT  =head1 FUNCTIONS
40    
41  A list of functions that can be exported.  You can delete this section  =head2 new
 if you don't export anything, such as for a purely object-oriented module.  
42    
43  =head1 FUNCTIONS  Create new input database object.
44    
45  =head2 function1    my $db = new WebPAC::Input(
46            format => 'NULL'
47            code_page => 'ISO-8859-2',
48      );
49    
50    Optional parametar C<code_page> specify application code page (which will be
51    used internally). This should probably be your terminal encoding, and by
52    default, it C<ISO-8859-2>.
53    
54  =cut  =cut
55    
56  sub function1 {  sub new {
57  }          my $class = shift;
58            my $self = {@_};
59            bless($self, $class);
60    
61  =head2 function2          $self->{'code_page'} ||= 'ISO-8859-2';
   
 =cut  
62    
63  sub function2 {          $self ? return $self : return undef;
64  }  }
65    
66  =head1 AUTHOR  =head1 MEMORY USAGE
67    
68  Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>  C<low_mem> options is double-edged sword. If enabled, WebPAC
69    will run on memory constraint machines (which doesn't have enough
70    physical RAM to create memory structure for whole source database).
71    
72    If your machine has 512Mb or more of RAM and database is around 10000 records,
73    memory shouldn't be an issue. If you don't have enough physical RAM, you
74    might consider using virtual memory (if your operating system is handling it
75    well, like on FreeBSD or Linux) instead of dropping to L<DBM::Deep> to handle
76    parsed structure of ISIS database (this is what C<low_mem> option does).
77    
78    Hitting swap at end of reading source database is probably o.k. However,
79    hitting swap before 90% will dramatically decrease performance and you will
80    be better off with C<low_mem> and using rest of availble memory for
81    operating system disk cache (Linux is particuallary good about this).
82    However, every access to database record will require disk access, so
83    generation phase will be slower 10-100 times.
84    
85    Parsed structures are essential - you just have option to trade RAM memory
86    (which is fast) for disk space (which is slow). Be sure to have planty of
87    disk space if you are using C<low_mem> and thus L<DBM::Deep>.
88    
89    However, when WebPAC is running on desktop machines (or laptops :-), it's
90    highly undesireable for system to start swapping. Using C<low_mem> option can
91    reduce WecPAC memory usage to around 64Mb for same database with lookup
92    fields and sorted indexes which stay in RAM. Performance will suffer, but
93    memory usage will really be minimal. It might be also more confortable to
94    run WebPAC reniced on those machines.
95    
 =head1 BUGS  
96    
97  Please report any bugs or feature requests to  =head1 AUTHOR
 C<bug-webpac-input@rt.cpan.org>, or through the web interface at  
 L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=WebPAC>.  
 I will be notified, and then you'll automatically be notified of progress on  
 your bug as I make changes.  
98    
99  =head1 ACKNOWLEDGEMENTS  Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>
100    
101  =head1 COPYRIGHT & LICENSE  =head1 COPYRIGHT & LICENSE
102    
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