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[spider.git] / perl / LRU.pm

diff --git a/perl/LRU.pm b/perl/LRU.pm
index 58b8be3befd3d734aeac7d221366416cfdcad9d1..5084a69530c3bbfe126b66d7cbed25e1d27088e0 100644 (file)
--- a/perl/LRU.pm
+++ b/perl/LRU.pm
@@ -3,7 +3,7 @@
 #
 # Copyright (c) 2002 Dirk Koopman, Tobit Computer Co Ltd 
 #
-# $Id$
+#
 #
 # The structure of the objects stored are:-
 #
@@ -26,20 +26,27 @@ use DXDebug;
 use vars qw(@ISA);
 @ISA = qw(Chain);
 
+use constant OBJ => 2;
+use constant MAX => 3;
+use constant INUSE => 4;
+use constant NAME => 5;
+use constant CALLBACK => 6;
+
 sub newbase
 {
        my $pkg = shift;
        my $name = shift;
        my $max = shift;
+       my $callback = shift;
        confess "LRU->newbase requires a name and maximal count" unless $name && $max;
-       return $pkg->SUPER::new({ }, $max, 0, $name);
+       return $pkg->SUPER::new({ }, $max, 0, $name, $callback);
 }
 
 sub get
 {
        my ($self, $call) = @_;
        if (my $p = $self->obj->{$call}) {
-               dbg("LRU $self->[5] cache hit $call") if isdbg('lru');
+               dbg("LRU $self->[NAME] cache hit $call") if isdbg('lru');
                $self->rechain($p);
                return $p->obj;
        }
@@ -53,42 +60,43 @@ sub put
        my $p = $self->obj->{$call};
        if ($p) {
                # update the reference and rechain it
-               dbg("LRU $self->[5] cache update $call") if isdbg('lru');
+               dbg("LRU $self->[NAME] cache update $call") if isdbg('lru');
                $p->obj($ref);
                $self->rechain($p);
        } else {
                # delete one of the end of the chain if required
-               while ($self->[4] >= $self->[3] ) {
+               while ($self->[INUSE] >= $self->[MAX] ) {
                        $p = $self->prev;
-                       my $call = $p->[3];
-                       dbg("LRU $self->[5] cache LRUed out $call now $self->[4]/$self->[3]") if isdbg('lru');
+                       my $call = $p->[MAX];
+                       dbg("LRU $self->[NAME] cache LRUed out $call now $self->[INUSE]/$self->[MAX]") if isdbg('lru');
                        $self->remove($call);
                }
 
                # add a new one
-               dbg("LRU $self->[5] cache add $call now $self->[4]/$self->[3]") if isdbg('lru');
+               dbg("LRU $self->[NAME] cache add $call now $self->[INUSE]/$self->[MAX]") if isdbg('lru');
                $p = $self->new($ref, $call);
                $self->add($p);
                $self->obj->{$call} = $p;
-               $self->[4]++;
+               $self->[INUSE]++;
        }
 }
 
 sub remove
 {
        my ($self, $call) = @_;
-       my $q = $self->obj->{$call};
-       confess("$call is already removed") unless $q;
-       dbg("LRU $self->[5] cache remove $call now $self->[4]/$self->[3]") if isdbg('lru');
-       $q->obj(1);
-       $q->SUPER::del;
+       my $p = $self->obj->{$call};
+       confess("$call is already removed") unless $p;
+       dbg("LRU $self->[NAME] cache remove $call now $self->[INUSE]/$self->[MAX]") if isdbg('lru');
+       &{$self->[CALLBACK]}($p->obj) if $self->[CALLBACK];        # call back if required
+       $p->obj(1);
+       $p->SUPER::del;
        delete $self->obj->{$call};
-       $self->[4]--;
+       $self->[INUSE]--;
 }
 
 sub count
 {
-       return $_[0]->[4];
+       return $_[0]->[INUSE];
 }
 
 1;