annotate Lib/IMPL/Object/Singleton.pm @ 206:c8fe3f84feba

+IMPL::Web::Handlers::ViewSelector +IMPL::Web::Handlers::ErrorHandler *IMPL::Web::Handlers::RestController moved types mappings to ViewSelector
author sergey
date Thu, 03 May 2012 16:48:39 +0400
parents 4d0e1962161c
children 0f59b2de72af
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1 package IMPL::Object::Singleton;
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2 use strict;
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3 use warnings;
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4
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5 my %instances;
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6
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7 sub CTOR {
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8 die new IMPL::InvalidOperationException("Only one instance of the singleton can be created",ref $_[0], $instances{ref $_[0]}) if $instances{ref $_[0]};
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9 $instances{ref $_[0]} = $_[0];
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10 }
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11
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12 sub instance {
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13 $instances{$_[0]}
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14 }
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15
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16 1;
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17
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18 __END__
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19
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20 =pod
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21
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22 =head1 SYNOPSIS
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23
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24 =begin code
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25
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26 package Foo;
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27
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28 use parent qw(IMPL::Object IMPL::Object::Singleton);
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29
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30 #....
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31
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32 Foo->isnatnce->some_work();
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33
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34 Foo->isnatnce->get_result();
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35
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36 =end code
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37
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38 =head1 DESCRIPTION
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39
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40 Реализует шаблон Singleton
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41
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42 =head1 MEMBERS
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43
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44 =head2 OPERATORS
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45
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46 =list
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47
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48 =item C<instance CLASS(@params)>
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49
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50 Создает или возвращает экземпляр класса, если экземляр не существует, то он создается с параметрами C<@params>.
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51
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52 =over
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53
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54 =cut