annotate Lib/IMPL/Object/Singleton.pm @ 366:935629bf80df

model metadata, in progress
author cin
date Mon, 02 Dec 2013 17:44:38 +0400
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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 require IMPL::Exception;
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6 use parent qw(
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7 IMPL::Class::Meta
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8 );
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9
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10 __PACKAGE__->static_accessor_own(_instance => undef);
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11
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12 sub InitInstance {
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13 my $self = shift;
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14 die IMPL::InvalidOperationException->new("Only one instance of the singleton can be created", $self)
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15 if $self->_instance;
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16
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17 $self->_instance($self->new(@_));
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18 }
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19
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20 sub instance {
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21 my $this = shift;
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22 return $this->_instance || $this->_instance($this->Activate());
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23 }
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24
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25 sub Activate {
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26 die IMPL::NotImplementedException->new("Activation isn't implemented", shift);
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27 }
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28
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29 sub Release {
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30 shift->_instance(undef);
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31 }
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32
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33 1;
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34
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35 __END__
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36
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37 =pod
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38
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39 =head1 SYNOPSIS
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40
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41 =begin code
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42
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43 package Foo;
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44
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4267a2ac3d46 Added Class::Template,
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45 use parent qw(IMPL::Object IMPL::Object::Singleton);
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46
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47 #....
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48
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49 Foo->isnatnce->some_work();
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50
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51 Foo->isnatnce->get_result();
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52
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53 =end code
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54
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55 =head1 DESCRIPTION
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56
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57 Реализует шаблон Singleton. Наследники данного класса могут иметь только один
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58 экземпляр. Создать этот экземпляр можно явно, используюя конструктор, либо
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59 автоматически при обращении к свойству C<instance>, для этого нужно
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60 переопределить метод C<Activate()>
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61
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62 =head1 MEMBERS
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63
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64 =head2 C<CTOR()>
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65
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66 Проверяет на единственность экземпляра класса, запоминает созданный экземпляр.
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68 =head2 C<[static,get]instance>
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70 Текущий экземпляр класса, если он еще не создан, то вызывает метод C<Activate>.
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72 =head2 C<[static,abstract]Activate()>
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74 Вызывается автоматически при обращении к свойству C<instance>, если экземпляр
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75 объекта еще не был создан.
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77 =head2 C<[static]Release()>
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78
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79 Освобождает текущий экземпляр.
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81 =cut