1Cache::BaseCache(3) User Contributed Perl Documentation Cache::BaseCache(3)
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6 Cache::BaseCache -- abstract cache base class
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9 BaseCache provides functionality common to all instances of a cache.
10 It differes from the CacheUtils package insofar as it is designed to be
11 used as superclass for cache implementations.
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14 Cache::BaseCache is to be used as a superclass for cache implementa‐
15 tions. The most effective way to use BaseCache is to use the protected
16 _set_backend method, which will be used to retrieve the persistance
17 mechanism. The subclass can then inherit the BaseCache's implentation
18 of get, set, etc. However, due to the difficulty inheriting static
19 methods in Perl, the subclass will likely need to explicitly implement
20 Clear, Purge, and Size. Also, a factory pattern should be used to
21 invoke the _complete_initialization routine after the object is con‐
22 structed.
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24 package Cache::MyCache;
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26 use vars qw( @ISA );
27 use Cache::BaseCache;
28 use Cache::MyBackend;
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30 @ISA = qw( Cache::BaseCache );
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32 sub new
33 {
34 my ( $self ) = _new( @_ );
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36 $self->_complete_initialization( );
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38 return $self;
39 }
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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 }
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50 sub Clear
51 {
52 foreach my $namespace ( _Namespaces( ) )
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54 _Get_Backend( )->delete_namespace( $namespace );
55 }
56 }
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58 sub Purge
59 {
60 foreach my $namespace ( _Namespaces( ) )
61 {
62 _Get_Cache( $namespace )->purge( );
63 }
64 }
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66 sub Size
67 {
68 my $size = 0;
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70 foreach my $namespace ( _Namespaces( ) )
71 {
72 $size += _Get_Cache( $namespace )->size( );
73 }
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75 return $size;
76 }
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79 Cache::Cache, Cache::FileCache, Cache::MemoryCache
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82 Original author: DeWitt Clinton <dewitt@unto.net>
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84 Last author: $Author: dclinton $
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86 Copyright (C) 2001-2003 DeWitt Clinton
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90perl v5.8.8 2003-04-15 Cache::BaseCache(3)