1Cache::BaseCache(3)   User Contributed Perl Documentation  Cache::BaseCache(3)
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NAME

6       Cache::BaseCache -- abstract cache base class
7

DESCRIPTION

9       BaseCache provides functionality common to all instances of a cache.
10       It differs from the CacheUtils package insofar as it is designed to be
11       used as superclass for cache implementations.
12

SYNOPSIS

14       Cache::BaseCache is to be used as a superclass for cache
15       implementations.  The most effective way to use BaseCache is to use the
16       protected _set_backend method, which will be used to retrieve the
17       persistence mechanism.  The subclass can then inherit the BaseCache's
18       implementation of get, set, etc.  However, due to the difficulty
19       inheriting static methods in Perl, the subclass will likely need to
20       explicitly implement Clear, Purge, and Size.  Also, a factory pattern
21       should be used to invoke the _complete_initialization routine after the
22       object is constructed.
23
24         package Cache::MyCache;
25
26         use vars qw( @ISA );
27         use Cache::BaseCache;
28         use Cache::MyBackend;
29
30         @ISA = qw( Cache::BaseCache );
31
32         sub new
33         {
34           my ( $self ) = _new( @_ );
35
36           $self->_complete_initialization( );
37
38           return $self;
39         }
40
41         sub _new
42         {
43           my ( $proto, $p_options_hash_ref ) = @_;
44           my $class = ref( $proto ) || $proto;
45           my $self = $class->SUPER::_new( $p_options_hash_ref );
46           $self->_set_backend( new Cache::MyBackend( ) );
47           return $self;
48         }
49
50
51         sub Clear
52         {
53           foreach my $namespace ( _Namespaces( ) )
54           {
55             _Get_Backend( )->delete_namespace( $namespace );
56           }
57         }
58
59
60         sub Purge
61         {
62           foreach my $namespace ( _Namespaces( ) )
63           {
64             _Get_Cache( $namespace )->purge( );
65           }
66         }
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68
69         sub Size
70         {
71           my $size = 0;
72
73           foreach my $namespace ( _Namespaces( ) )
74           {
75             $size += _Get_Cache( $namespace )->size( );
76           }
77
78           return $size;
79         }
80

SEE ALSO

82       Cache::Cache, Cache::FileCache, Cache::MemoryCache
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AUTHOR

85       Original author: DeWitt Clinton <dewitt@unto.net>
86
87       Last author:     $Author: dclinton $
88
89       Copyright (C) 2001-2003 DeWitt Clinton
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93perl v5.28.1                      2015-01-22               Cache::BaseCache(3)
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