--- trunk/lib/WebPAC/Input.pm 2006/09/07 15:01:45 652 +++ trunk/lib/WebPAC/Input.pm 2006/10/25 17:10:08 761 @@ -16,11 +16,11 @@ =head1 VERSION -Version 0.12 +Version 0.14 =cut -our $VERSION = '0.12'; +our $VERSION = '0.14'; =head1 SYNOPSIS @@ -43,7 +43,6 @@ my $db = WebPAC::Input->new( module => 'WebPAC::Input::ISIS', - low_mem => 1, ); $db->open( path => '/path/to/database' ); @@ -63,7 +62,6 @@ my $db = new WebPAC::Input( module => 'WebPAC::Input::MARC', encoding => 'ISO-8859-2', - low_mem => 1, recode => 'char pairs', no_progress_bar => 1, ); @@ -75,8 +73,6 @@ used internally). This should probably be your terminal encoding, and by default, it C. -Default is not to use C options (see L below). - C is optional string constisting of character or words pairs that should be replaced in input stream. @@ -96,60 +92,23 @@ $log->logconfess("code_page argument is not suppored any more. change it to encoding") if ($self->{lookup}); $log->logconfess("lookup argument is not suppored any more. rewrite call to lookup_ref") if ($self->{lookup}); + $log->logconfess("low_mem argument is not suppored any more. rewrite it to load_row and save_row") if ($self->{low_mem}); $log->logconfess("specify low-level file format module") unless ($self->{module}); - my $module = $self->{module}; - $module =~ s#::#/#g; - $module .= '.pm'; - $log->debug("require low-level module $self->{module} from $module"); + my $module_path = $self->{module}; + $module_path =~ s#::#/#g; + $module_path .= '.pm'; + $log->debug("require low-level module $self->{module} from $module_path"); - require $module; - #eval $self->{module} .'->import'; + require $module_path; # check if required subclasses are implemented foreach my $subclass (qw/open_db fetch_rec init dump_rec/) { - my $n = $self->{module} . '::' . $subclass; - if (! defined &{ $n }) { - my $missing = "missing $subclass in $self->{module}"; - $self->{$subclass} = sub { $log->logwarn($missing) }; - } else { - $self->{$subclass} = \&{ $n }; - } - } - - if ($self->{init}) { - $log->debug("calling init"); - $self->{init}->($self, @_); + # FIXME } $self->{'encoding'} ||= 'ISO-8859-2'; - # running with low_mem flag? well, use DBM::Deep then. - if ($self->{'low_mem'}) { - $log->info("running with low_mem which impacts performance (<32 Mb memory usage)"); - - my $db_file = "data.db"; - - if (-e $db_file) { - unlink $db_file or $log->logdie("can't remove '$db_file' from last run"); - $log->debug("removed '$db_file' from last run"); - } - - require DBM::Deep; - - my $db = new DBM::Deep $db_file; - - $log->logdie("DBM::Deep error: $!") unless ($db); - - if ($db->error()) { - $log->logdie("can't open '$db_file' under low_mem: ",$db->error()); - } else { - $log->debug("using file '$db_file' for DBM::Deep"); - } - - $self->{'db'} = $db; - } - $self ? return $self : return undef; } @@ -157,22 +116,33 @@ This function will read whole database in memory and produce lookups. + my $store; # simple in-memory hash + $input->open( path => '/path/to/database/file', code_page => 'cp852', limit => 500, offset => 6000, - lookup => $lookup_obj, stats => 1, - lookup_ref => sub { - my ($k,$v) = @_; - # store lookup $k => $v + lookup_coderef => sub { + my $rec = shift; + # store lookups }, modify_records => { 900 => { '^a' => { ' : ' => '^b' } }, 901 => { '*' => { '^b' => ' ; ' } }, }, modify_file => 'conf/modify/mapping.map', + save_row => sub { + my $a = shift; + $store->{ $a->{id} } = $a->{row}; + }, + load_row => sub { + my $a = shift; + return defined($store->{ $a->{id} }) && + $store->{ $a->{id} }; + }, + ); By default, C is assumed to be C. @@ -183,8 +153,7 @@ C create optional report about usage of fields and subfields -C is closure to call when adding C<< key => 'value' >> combinations to -lookup. +C is closure to called to save data into lookups C specify mapping from subfields to delimiters or from delimiters to subfields, as well as oprations on fields (if subfield is @@ -194,6 +163,9 @@ (hopefully) simplier sintax than YAML or perl (see L). This option overrides C if both exists for same input. +C and C are low-level implementation of store engine. Calling convention +is documented in example above. + Returns size of database, regardless of C and C parametars, see also C. @@ -209,6 +181,8 @@ $log->logconfess("lookup_coderef must be CODE, not ",ref($arg->{lookup_coderef})) if ($arg->{lookup_coderef} && ref($arg->{lookup_coderef}) ne 'CODE'); + $log->debug( $arg->{lookup_coderef} ? '' : 'not ', "using lookup_coderef"); + $log->logcroak("need path") if (! $arg->{'path'}); my $code_page = $arg->{'code_page'} || 'cp852'; @@ -218,6 +192,16 @@ $self->{$v} = $arg->{$v} if ($arg->{$v}); } + if ($arg->{load_row} || $arg->{save_row}) { + $log->logconfess("save_row and load_row must be defined in pair and be CODE") unless ( + ref($arg->{load_row}) eq 'CODE' && + ref($arg->{save_row}) eq 'CODE' + ); + $self->{load_row} = $arg->{load_row}; + $self->{save_row} = $arg->{save_row}; + $log->debug("using load_row and save_row instead of in-memory hash"); + } + my $filter_ref; my $recode_regex; my $recode_map; @@ -250,7 +234,9 @@ } $log->debug("rec_regex: ", Dumper($rec_regex)) if ($rec_regex); - my ($db, $size) = $self->{open_db}->( $self, + my $class = $self->{module} || $log->logconfess("can't get low-level module name!"); + + my $ll_db = $class->new( path => $arg->{path}, # filter => sub { # my ($l,$f_nr) = @_; @@ -262,11 +248,13 @@ %{ $arg }, ); - unless (defined($db)) { + unless (defined($ll_db)) { $log->logwarn("can't open database $arg->{path}, skipping..."); return; } + my $size = $ll_db->size; + unless ($size) { $log->logwarn("no records in database $arg->{path}, skipping..."); return; @@ -298,7 +286,7 @@ $log->debug("position: $pos\n"); - my $rec = $self->{fetch_rec}->($self, $pos, sub { + my $rec = $ll_db->fetch_rec($pos, sub { my ($l,$f_nr) = @_; # return unless defined($l); # return $l unless ($rec_regex && $f_nr); @@ -335,8 +323,11 @@ } # store - if ($self->{low_mem}) { - $self->{db}->put($pos, $rec); + if ($self->{save_row}) { + $self->{save_row}->({ + id => $pos, + row => $rec, + }); } else { $self->{data}->{$pos} = $rec; } @@ -348,7 +339,7 @@ if ($self->{stats}) { # fetch clean record with regexpes applied for statistics - my $rec = $self->{fetch_rec}->($self, $pos); + my $rec = $ll_db->fetch_rec($pos); foreach my $fld (keys %{ $rec }) { $self->{_stats}->{fld}->{ $fld }++; @@ -385,6 +376,9 @@ $self->{max_pos} = $to_rec; $log->debug("max_pos: $to_rec"); + # save for dump + $self->{ll_db} = $ll_db; + return $size; } @@ -424,8 +418,8 @@ my $rec; - if ($self->{low_mem}) { - $rec = $self->{db}->get($mfn); + if ($self->{load_row}) { + $rec = $self->{load_row}->({ id => $mfn }); } else { $rec = $self->{data}->{$mfn}; } @@ -555,7 +549,7 @@ sub dump { my $self = shift; - return $self->{dump_rec}->($self, $self->{pos}); + return $self->{ll_db}->dump_rec( $self->{pos} ); } @@ -640,7 +634,7 @@ my $regexpes; - CORE::open(my $fh, $modify_path) || $log->die("can't open modify file $modify_path: $!"); + CORE::open(my $fh, $modify_path) || $log->logdie("can't open modify file $modify_path: $!"); my ($f,$sf); @@ -670,37 +664,6 @@ return $regexpes; } -=head1 MEMORY USAGE - -C options is double-edged sword. If enabled, WebPAC -will run on memory constraint machines (which doesn't have enough -physical RAM to create memory structure for whole source database). - -If your machine has 512Mb or more of RAM and database is around 10000 records, -memory shouldn't be an issue. If you don't have enough physical RAM, you -might consider using virtual memory (if your operating system is handling it -well, like on FreeBSD or Linux) instead of dropping to L to handle -parsed structure of ISIS database (this is what C option does). - -Hitting swap at end of reading source database is probably o.k. However, -hitting swap before 90% will dramatically decrease performance and you will -be better off with C and using rest of availble memory for -operating system disk cache (Linux is particuallary good about this). -However, every access to database record will require disk access, so -generation phase will be slower 10-100 times. - -Parsed structures are essential - you just have option to trade RAM memory -(which is fast) for disk space (which is slow). Be sure to have planty of -disk space if you are using C and thus L. - -However, when WebPAC is running on desktop machines (or laptops :-), it's -highly undesireable for system to start swapping. Using C option can -reduce WecPAC memory usage to around 64Mb for same database with lookup -fields and sorted indexes which stay in RAM. Performance will suffer, but -memory usage will really be minimal. It might be also more confortable to -run WebPAC reniced on those machines. - - =head1 AUTHOR Dobrica Pavlinusic, C<< >>