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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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use EntityModel::Class; |
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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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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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Returns $self. |
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=cut |
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sub apply { |
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my $self = shift; |
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return $self if $self->{rolled_back}; |
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return $self unless try { |
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# commit |
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1; |
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} catch { |
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$self->mark_failure; |
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$self->mark_goodbye; |
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0 |
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}; |
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$self->mark_success; |
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$self->mark_goodbye; |
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$self; |
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} |
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=head2 mark_failure |
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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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Takes no parameters. |
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Returns $self. |
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70
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=cut |
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sub mark_failure { |
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my $self = shift; |
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# rollback here |
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$self->{rolled_back} = 1; |
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$self->{on_failure}->($self) if exists $self->{on_failure}; |
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824
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$self |
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} |
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=head2 mark_success |
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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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Takes no parameters. |
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Returns $self. |
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89
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=cut |
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sub mark_success { |
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my $self = shift; |
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$self->{on_success}->($self) if exists $self->{on_success}; |
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3
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670
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$self |
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} |
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=head2 mark_goodbye |
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Mark this transaction as completed. Calls the C coderef |
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if available. |
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102
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Takes no parameters. |
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104
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Returns $self. |
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106
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=cut |
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108
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sub mark_goodbye { |
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my $self = shift; |
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$self->{on_goodbye}->($self) if exists $self->{on_goodbye}; |
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1751
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$self |
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} |
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114
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=head2 run |
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Takes the following (named) parameters: |
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=over 4 |
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120
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=item * |
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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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126
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=cut |
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128
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sub run { |
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my $self = shift; |
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my $code = shift; |
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my %args = @_; |
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$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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# this to set up a few deferred events and return |
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# quickly |
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return $self unless try { |
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sap($self, $code)->(); |
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1; |
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} catch { |
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# Something went wrong, bail |
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$self->mark_failure; |
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$self->mark_goodbye; |
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0; |
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}; |
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$self; |
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} |
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sub commit { |
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my $self = shift; |
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return $self if $self->{rolled_back}; |
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$self->{committed} = 1; |
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3
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$self |
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} |
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sub DESTROY { |
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1291
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my $self = shift; |
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warn "did not finish" unless $self->{committed} || $self->{rolled_back}; |
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} |
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160
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sub sap { |
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my ($self, $sub) = @_; |
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Scalar::Util::weaken $self; |
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return sub { |
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$self->$sub(@_); |
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}; |
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} |
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1; |
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__END__ |