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113 lines
3.6 KiB
113 lines
3.6 KiB
#!/usr/bin/perl
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package Koha::Z3950Responder::GenericSession;
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# Copyright The National Library of Finland 2018
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#
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# This file is part of Koha.
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#
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# Koha 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
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# Koha is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Koha; if not, see <http://www.gnu.org/licenses>.
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use Modern::Perl;
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use base qw( Koha::Z3950Responder::Session );
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use Koha::Logger;
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use Koha::SearchEngine::Search;
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use Koha::SearchEngine::QueryBuilder;
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use Koha::Z3950Responder::RPN;
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=head1 NAME
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Koha::Z3950Responder::genericSession
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=head1 SYNOPSIS
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Backend-agnostic session class that uses C<Koha::Session> as the base class. Utilizes
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C<Koha::SearchEngine> for the actual functionality.
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=head2 INSTANCE METHODS
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=head3 start_search
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my ($resultset, $hits) = $self->start_search( $args, $self->{server}->{num_to_prefetch} );
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Perform a search using C<Koha::SearchEngine>'s QueryBuilder and Search.
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=cut
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sub start_search {
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my ( $self, $args, $num_to_prefetch ) = @_;
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if (!defined $self->{'attribute_mappings'}) {
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require YAML;
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$self->{'attribute_mappings'} = YAML::LoadFile($self->{server}->{config_dir} . 'attribute_mappings.yaml');
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}
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my $database = $args->{DATABASES}->[0];
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my $builder = Koha::SearchEngine::QueryBuilder->new({ index => $database });
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my $searcher = Koha::SearchEngine::Search->new({ index => $database });
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my $built_query;
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my $query = $args->{RPN}->{'query'}->to_koha($self->{'attribute_mappings'}->{$database});
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$self->log_debug(" parsed search: $query");
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my @operands = $query;
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(undef, $built_query) = $builder->build_query_compat( undef, \@operands, undef, undef, undef, 0);
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my ($error, $marcresults, $hits ) = $searcher->simple_search_compat($built_query, 0, $num_to_prefetch);
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if (defined $error) {
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$self->set_error($args, $self->ERR_SEARCH_FAILED, 'Search failed');
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return;
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}
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my $resultset = {
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query => $built_query,
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database => $database,
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cached_offset => 0,
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cached_results => $marcresults,
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hits => $hits
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};
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return ($resultset, $hits);
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}
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=head3 fetch_record
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my $record = $self->fetch_record( $resultset, $args, $offset, $server->{num_to_prefetch} );
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Fetch a record from SearchEngine. Caches records in session to avoid too many fetches.
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=cut
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sub fetch_record {
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my ( $self, $resultset, $args, $index, $num_to_prefetch ) = @_;
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# Fetch more records if necessary
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my $offset = $args->{OFFSET} - 1;
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if ($offset < $resultset->{cached_offset} || $offset >= $resultset->{cached_offset} + $num_to_prefetch) {
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$self->log_debug(" fetch uncached, fetching $num_to_prefetch records starting at $offset");
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my $searcher = Koha::SearchEngine::Search->new({ index => $resultset->{'database'} });
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my ($error, $marcresults, $num_hits ) = $searcher->simple_search_compat($resultset->{'query'}, $offset, $num_to_prefetch);
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if (defined $error) {
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$self->set_error($args, $self->ERR_TEMPORARY_ERROR, 'Fetch failed');
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return;
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}
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$resultset->{cached_offset} = $offset;
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$resultset->{cached_results} = $marcresults;
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}
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return $resultset->{cached_results}[$offset - $resultset->{cached_offset}];
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}
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1;
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