Mercurial > pub > Impl
annotate Lib/IMPL/Object/Singleton.pm @ 251:9f394b27dccf
require can handle recursive module references
| author | sergey |
|---|---|
| date | Fri, 16 Nov 2012 16:44:16 +0400 |
| parents | 4d0e1962161c |
| children | 0f59b2de72af |
| rev | line source |
|---|---|
| 49 | 1 package IMPL::Object::Singleton; |
| 2 use strict; | |
| 3 use warnings; | |
| 4 | |
| 5 my %instances; | |
| 6 | |
| 143 | 7 sub CTOR { |
| 194 | 8 die new IMPL::InvalidOperationException("Only one instance of the singleton can be created",ref $_[0], $instances{ref $_[0]}) if $instances{ref $_[0]}; |
| 9 $instances{ref $_[0]} = $_[0]; | |
| 143 | 10 } |
| 11 | |
| 49 | 12 sub instance { |
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13 $instances{$_[0]} |
| 49 | 14 } |
| 15 | |
| 16 1; | |
| 17 | |
| 18 __END__ | |
| 19 | |
| 20 =pod | |
| 21 | |
| 22 =head1 SYNOPSIS | |
| 23 | |
| 88 | 24 =begin code |
| 25 | |
| 49 | 26 package Foo; |
| 27 | |
| 166 | 28 use parent qw(IMPL::Object IMPL::Object::Singleton); |
| 49 | 29 |
| 30 #.... | |
| 31 | |
| 32 Foo->isnatnce->some_work(); | |
| 33 | |
| 34 Foo->isnatnce->get_result(); | |
| 35 | |
| 88 | 36 =end code |
| 37 | |
| 49 | 38 =head1 DESCRIPTION |
| 39 | |
| 180 | 40 Реализует шаблон Singleton |
| 49 | 41 |
| 42 =head1 MEMBERS | |
| 43 | |
| 44 =head2 OPERATORS | |
| 45 | |
| 46 =list | |
| 47 | |
| 48 =item C<instance CLASS(@params)> | |
| 49 | |
| 180 | 50 Создает или возвращает экземпляр класса, если экземляр не существует, то он создается с параметрами C<@params>. |
| 49 | 51 |
| 52 =over | |
| 53 | |
| 54 =cut |