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package Suggest::PrePop; |
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133889
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use strict; |
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use warnings; |
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our $VERSION = '1.0.0'; |
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1265
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use Moose; |
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use Cache::RedisDB; |
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has cache_namespace => ( |
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is => 'ro', |
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isa => 'Str', |
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default => 'SUGGEST-PREPOP', |
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); |
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my $key_sep = '<>'; |
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has _lex_key => ( |
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is => 'ro', |
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isa => 'Str', |
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lazy => 1, |
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default => sub { |
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my $self = shift; |
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return join($key_sep, $self->cache_namespace, 'ITEMS_BY_LEX'); |
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}, |
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); |
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has _cnt_key => ( |
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is => 'ro', |
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isa => 'Str', |
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lazy => 1, |
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default => sub { |
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my $self = shift; |
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return join($key_sep, $self->cache_namespace, 'ITEMS_BY_COUNT'); |
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}, |
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); |
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has min_activity => ( |
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is => 'ro', |
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isa => 'Int', |
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default => 5, |
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); |
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has entries_limit => ( |
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is => 'ro', |
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isa => 'Int', |
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default => 32768, |
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); |
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has top_count => ( |
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is => 'ro', |
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isa => 'Int', |
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default => 5, |
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); |
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# Convenience |
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sub _redis { Cache::RedisDB->redis } |
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sub add { |
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my ($self, $item, $count) = @_; |
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$count //= 1; # Most of the time we'll just get a single entry |
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# For now, we just assume supplied items are well-formed |
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my $redis = $self->_redis; |
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# Lexically sorted items are all zero-scored |
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$redis->zadd($self->_lex_key, 0, $item); |
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# Score sorted items get incremented. |
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return $redis->zincrby($self->_cnt_key, $count, $item); |
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} |
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sub ask { |
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my ($self, $prefix, $count) = @_; |
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$count //= $self->top_count; # If they don't say we try to find the 5 best. |
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80
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my $redis = $self->_redis; |
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my @full = |
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map { $_->[0] } |
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sort { $b->[1] <=> $a->[1] } |
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grep { $_->[1] >= $self->min_activity } |
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map { [$_, $redis->zscore($self->_cnt_key, $_)] } @{ |
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$redis->zrangebylex( |
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$self->_lex_key, |
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'[' . $prefix, |
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'[' . $prefix . "\xff" |
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) // []}; |
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return [scalar(@full <= $count) ? @full : @full[0 .. $count - 1]]; |
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} |
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sub prune { |
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my ($self, $keep) = @_; |
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$keep //= $self->entries_limit; |
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101
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my $redis = $self->_redis; |
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103
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# Count key is the one from which results are collated, so even |
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# if things are out of sync, this is the one about which we care. |
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return 0 if ($redis->zcard($self->_cnt_key) <= $keep); |
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107
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my $final_index = -1 * $keep - 1; # Range below is inclusive. |
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my @to_prune = @{$redis->zrange($self->_cnt_key, 0, $final_index)}; |
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my $count = scalar @to_prune; |
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111
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# We're going to do this the slow way to keep them in sync. |
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foreach my $item (@to_prune) { |
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$redis->zrem($self->_cnt_key, $item); |
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$redis->zrem($self->_lex_key, $item); |
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} |
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117
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return $count; |
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} |
119
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120
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1; |
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122
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__END__ |