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package EntityModel::Transaction; |
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{ |
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$EntityModel::Transaction::VERSION = '0.102'; |
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} |
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14337
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use EntityModel::Class; |
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128
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use overload '&{}' => sub { |
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my $self = shift; |
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sap($self, 'apply'); |
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}, fallback => 1; |
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use Try::Tiny; |
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39831
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11231
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=head1 NAME |
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EntityModel::Transaction - transaction co-ordinator |
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=head1 VERSION |
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version 0.102 |
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=head1 SYNOPSIS |
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See L. |
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=head1 DESCRIPTION |
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Contacts each L instance and requests that they join a new |
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transaction. |
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See L. |
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=head2 apply |
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Applies the current transaction. Typically called as the last |
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step in the transaction codeblock. The &{} overload will call |
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this method (so you can use C< $tran->() > or C< $tran->apply > |
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interchangeably). |
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Takes no parameters. |
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40
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Returns $self. |
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=cut |
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sub apply { |
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4
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4
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1
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my $self = shift; |
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47
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4
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100
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return $self if $self->{rolled_back}; |
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return $self unless try { |
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# commit |
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3
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3
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116
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1; |
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} catch { |
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0
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0
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$self->mark_failure; |
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0
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0
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$self->mark_goodbye; |
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0
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0
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0 |
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3
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}; |
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3
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$self->mark_success; |
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3
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$self->mark_goodbye; |
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3
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$self; |
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} |
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61
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=head2 mark_failure |
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63
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Mark this transaction as failed, applying rollback if required, and |
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calls the failure coderef. |
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66
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Takes no parameters. |
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68
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Returns $self. |
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70
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=cut |
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72
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sub mark_failure { |
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2
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2
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1
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my $self = shift; |
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# rollback here |
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2
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$self->{rolled_back} = 1; |
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2
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$self->{on_failure}->($self) if exists $self->{on_failure}; |
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2
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824
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$self |
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} |
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80
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=head2 mark_success |
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82
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Mark this transaction as successful, committing if required, and |
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calls the success coderef. |
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85
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Takes no parameters. |
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86
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87
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Returns $self. |
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88
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89
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=cut |
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90
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91
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sub mark_success { |
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92
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3
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3
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1
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7
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my $self = shift; |
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93
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3
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100
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19
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$self->{on_success}->($self) if exists $self->{on_success}; |
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94
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3
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670
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$self |
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95
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} |
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96
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97
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=head2 mark_goodbye |
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98
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99
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Mark this transaction as completed. Calls the C coderef |
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if available. |
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101
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102
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Takes no parameters. |
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103
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104
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Returns $self. |
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105
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106
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=cut |
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107
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108
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sub mark_goodbye { |
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5
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5
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1
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8
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my $self = shift; |
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110
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5
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100
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40
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$self->{on_goodbye}->($self) if exists $self->{on_goodbye}; |
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111
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5
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1751
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$self |
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112
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} |
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113
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114
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=head2 run |
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115
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116
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Takes the following (named) parameters: |
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117
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118
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=over 4 |
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119
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120
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=item * |
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121
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122
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=back |
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124
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Returns $self. |
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125
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126
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=cut |
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127
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128
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sub run { |
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129
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5
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5
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1
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10
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my $self = shift; |
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130
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5
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6
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my $code = shift; |
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131
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5
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14
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my %args = @_; |
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132
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5
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124
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$self->{"on_$_"} = delete $args{$_} for grep exists $args{$_}, qw(success failure goodbye); |
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# Attempt the transaction bit, normally we'd expect |
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134
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# this to set up a few deferred events and return |
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135
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# quickly |
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136
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return $self unless try { |
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137
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5
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5
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202
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sap($self, $code)->(); |
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138
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3
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443
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1; |
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139
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} catch { |
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140
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# Something went wrong, bail |
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141
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2
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2
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952
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$self->mark_failure; |
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142
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2
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9
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$self->mark_goodbye; |
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143
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2
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14
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0; |
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144
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5
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100
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42
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}; |
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145
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3
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57
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$self; |
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146
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} |
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147
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148
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sub commit { |
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149
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5
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5
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0
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431
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my $self = shift; |
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150
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5
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100
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27
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return $self if $self->{rolled_back}; |
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151
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3
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7
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$self->{committed} = 1; |
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152
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3
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10
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$self |
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153
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} |
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154
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155
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sub DESTROY { |
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156
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5
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5
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1291
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my $self = shift; |
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157
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5
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50
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66
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66
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warn "did not finish" unless $self->{committed} || $self->{rolled_back}; |
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158
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} |
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159
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160
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sub sap { |
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161
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9
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9
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1
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30
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my ($self, $sub) = @_; |
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162
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9
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29
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Scalar::Util::weaken $self; |
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163
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return sub { |
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164
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9
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9
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29
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$self->$sub(@_); |
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165
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9
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54
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}; |
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166
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} |
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167
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168
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1; |
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169
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170
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__END__ |