# -*- cperl -*- #

=head1 NAME

Singleton::Memcache - A singleton wrapper around Danga's memcache.

=head1 SYNOPSIS

=for example begin

    #!/usr/bin/perl -w

    use Singleton::Memcache;
    use strict;

    my $cache = Singleton::Memcache->instance();

    $cache->set( "bob", "your uncle" );

    $cache->get( "bob" );

    $cache->delete( "bob" );

=for example end


=head1 DESCRIPTION


  Singleton Wrapper around Cache::Memcached

  This is a proxy object, which will attempt to create a Cache::Memcac
+hed
 object to forward requests to.

  If we cannot create one we just use stub implementations to fail
 gracefully.  
  We will fail if the <Cache::Memcached> Perl module isn't available o
+r otherwise 
      fails to connect.


 Steve
 --
 www.steve.org.uk

 $Id: Memcache.pm,v 1.8 2005/11/09 02:30:08 steve Exp $

=cut



package Singleton::Memcache;


use strict;
use warnings;



#
#  The single, global, instance of this object
#
my $_cache;

#
#  The memcache instance we use.
#
my $_memcache;



=head2 new

  Gain access to the cache instance.  If the singleton object has been
 created return it.  Otherwise create a new instance.

=cut

sub instance
{
    $_cache ||= (shift)->new();
}



=head2 new

  Constructor.  We connect to the cache, and store a reference to it
 internally.

  If the cache is disabled in the configuration file then we do nothin
+g,
 similarly if the creation of the cache connection fails then we
 just quietly disable ourself.

=cut

sub new
{
    my ( $self ) = (@_);

    my $class=ref($self) || $self;

    #
    #  See if we're enabled
    #
    my $test    = "use Cache::Memcached;";

    #
    #  Test loading the Cache module, if it fails then
    # the cache isn't enabled.
    #
    eval( $test );
    if ( $@ )
    {
    $enabled = 0;
    }

    #
    # Connect
    #
    if ( $enabled )
    {
    $_memcache = new Cache::Memcached {
        'servers' => [ "localhost:11211" ] };

    }

    return bless {}, $class;
}



=head2 disconnect_all

  Disconnect from the cache

=cut 

sub disconnect_all
{
    my ( $self, @rest ) = ( @_ );

    $_memcache->disconnect_all( @rest ) if defined( $_memcache );
}



=head2 get

  Get a key from the cache

=cut

sub get
{
    my ( $self, @rest ) = ( @_ );

    $_memcache->get( @rest ) if defined( $_memcache );
}



=head2 set

  Set a key in the cache.  Note that we'll get a warning from Perl
 if we attempt to set an undefined value.

  We could catch it here, but we do not.

=cut
sub set
{
    my ( $self, @rest ) = ( @_ );

    $_memcache->set( @rest ) if defined( $_memcache );
}



=head2 delete

  Delete a key from the cache.

=cut

sub delete
{
    my ( $self, @rest ) = ( @_ );


    $_memcache->delete( @rest ) if defined( $_memcache );
}


1;
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