/usr/share/perl5/CHI/Driver/Role/IsSizeAware.pm is in libchi-perl 0.60-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | package CHI::Driver::Role::IsSizeAware;
$CHI::Driver::Role::IsSizeAware::VERSION = '0.60';
use Carp::Assert;
use Moo::Role;
use MooX::Types::MooseLike::Base qw(:all);
use CHI::Types qw(:all);
use strict;
use warnings;
has 'discard_policy' => ( is => 'lazy', isa => Maybe[DiscardPolicy] );
has 'discard_timeout' => ( is => 'rw', isa => Num, default => sub { 10 } );
has 'max_size' => ( is => 'rw', isa => MemorySize, coerce => \&to_MemorySize );
has 'max_size_reduction_factor' => ( is => 'rw', isa => Num, default => sub { 0.8 } );
use constant Size_Key => 'CHI_IsSizeAware_size';
sub _build_discard_policy {
my $self = shift;
return $self->can('default_discard_policy')
? $self->default_discard_policy
: 'arbitrary';
}
after 'BUILD_roles' => sub {
my ( $self, $params ) = @_;
$self->{is_size_aware} = 1;
};
after 'clear' => sub {
my $self = shift;
$self->_set_size(0);
};
around 'remove' => sub {
my $orig = shift;
my $self = shift;
my ($key) = @_;
my ( $size_delta, $obj );
if ( !$self->{_no_set_size_on_remove}
&& ( $obj = $self->get_object($key) ) )
{
$size_delta = -1 * $obj->size;
}
$self->$orig(@_);
if ($size_delta) {
$self->_add_to_size($size_delta);
}
};
around 'set_object' => sub {
my ( $orig, $self, $key, $obj ) = @_;
# If item exists, record its size so we can subtract it below
#
my $size_delta = 0;
if ( my $obj = $self->get_object($key) ) {
$size_delta = -1 * $obj->size;
}
my $result = $self->$orig( $key, $obj );
# Add to size and reduce size if over the maximum
#
$size_delta += $obj->size;
my $namespace_size = $self->_add_to_size($size_delta);
if ( defined( $self->max_size )
&& $namespace_size > $self->max_size )
{
$self->discard_to_size(
$self->max_size * $self->max_size_reduction_factor );
}
return $result;
};
sub get_size {
my ($self) = @_;
my $size = $self->metacache->get(Size_Key) || 0;
return $size;
}
sub _set_size {
my ( $self, $new_size ) = @_;
$self->metacache->set( Size_Key, $new_size );
}
sub _add_to_size {
my ( $self, $incr ) = @_;
# Non-atomic, so may be inaccurate over time
my $new_size = ( $self->get_size || 0 ) + $incr;
$self->_set_size($new_size);
return $new_size;
}
sub discard_to_size {
my ( $self, $ceiling ) = @_;
# Get an iterator that produces keys in the order they should be removed
#
my $discard_iterator =
$self->_get_iterator_for_discard_policy( $self->discard_policy );
# Remove keys until we are under $ceiling. Temporarily turn off size
# setting on remove because we will set size once at end. Check if
# we exceed discard timeout.
#
my $end_time = time + $self->discard_timeout;
local $self->{_no_set_size_on_remove} = 1;
my $size = $self->get_size();
eval {
while ( $size > $ceiling ) {
if ( defined( my $key = $discard_iterator->() ) ) {
if ( my $obj = $self->get_object($key) ) {
$self->remove($key);
$size -= $obj->size;
}
}
else {
affirm { $self->is_empty }
"iterator returned undef, cache should be empty";
last;
}
if ( time > $end_time ) {
die sprintf( "discard timeout (%s sec) reached",
$self->discard_timeout );
}
}
};
$self->_set_size($size);
die $@ if $@;
}
sub _get_iterator_for_discard_policy {
my ( $self, $discard_policy ) = @_;
if ( ref($discard_policy) eq 'CODE' ) {
return $discard_policy->($self);
}
else {
my $discard_policy_sub = "discard_policy_" . $discard_policy;
if ( $self->can($discard_policy_sub) ) {
return $self->$discard_policy_sub();
}
else {
die sprintf( "cannot get iterator for discard policy '%s' ('%s')",
$discard_policy, $discard_policy_sub );
}
}
}
sub discard_policy_arbitrary {
my ($self) = @_;
return $self->get_keys_iterator();
}
1;
|