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1 | package DBIx::Class::Storage::TxnScopeGuard; |
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2 | |
3 | use strict; |
4 | use warnings; |
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5 | use Carp::Clan qw/^DBIx::Class/; |
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6 | |
7 | sub new { |
8 | my ($class, $storage) = @_; |
9 | |
10 | $storage->txn_begin; |
11 | bless [ 0, $storage ], ref $class || $class; |
12 | } |
13 | |
14 | sub commit { |
15 | my $self = shift; |
16 | |
17 | $self->[1]->txn_commit; |
18 | $self->[0] = 1; |
19 | } |
20 | |
21 | sub DESTROY { |
22 | my ($dismiss, $storage) = @{$_[0]}; |
23 | |
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24 | return if $dismiss; |
25 | |
26 | my $exception = $@; |
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27 | |
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28 | carp 'A DBIx::Class::Storage::TxnScopeGuard went out of scope without explicit commit or error. Rolling back.' |
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29 | unless $exception; |
30 | |
31 | my $rollback_exception; |
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32 | { |
33 | local $@; |
34 | eval { $storage->txn_rollback }; |
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35 | $rollback_exception = $@; |
36 | } |
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37 | |
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38 | if ($rollback_exception && $rollback_exception !~ /DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION/) { |
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39 | if ($exception) { |
40 | $@ = "Transaction aborted: ${exception} " |
41 | ."Rollback failed: ${rollback_exception}"; |
42 | } |
43 | else { |
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44 | # throws an object (verified with eval{}) but DESTROY eats the exception |
45 | $storage->throw_exception ("Rollback failed: ${rollback_exception}"); |
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46 | } |
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47 | } |
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48 | } |
49 | |
50 | 1; |
51 | |
52 | __END__ |
53 | |
54 | =head1 NAME |
55 | |
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56 | DBIx::Class::Storage::TxnScopeGuard - Scope-based transaction handling |
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57 | |
58 | =head1 SYNOPSIS |
59 | |
60 | sub foo { |
61 | my ($self, $schema) = @_; |
62 | |
63 | my $guard = $schema->txn_scope_guard; |
64 | |
65 | # Multiple database operations here |
66 | |
67 | $guard->commit; |
68 | } |
69 | |
70 | =head1 DESCRIPTION |
71 | |
72 | An object that behaves much like L<Scope::Guard>, but hardcoded to do the |
73 | right thing with transactions in DBIx::Class. |
74 | |
75 | =head1 METHODS |
76 | |
77 | =head2 new |
78 | |
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79 | Creating an instance of this class will start a new transaction (by |
80 | implicitly calling L<DBIx::Class::Storage/txn_begin>. Expects a |
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81 | L<DBIx::Class::Storage> object as its only argument. |
82 | |
83 | =head2 commit |
84 | |
85 | Commit the transaction, and stop guarding the scope. If this method is not |
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86 | called and this object goes out of scope (i.e. an exception is thrown) then |
87 | the transaction is rolled back, via L<DBIx::Class::Storage/txn_rollback> |
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88 | |
89 | =cut |
90 | |
91 | =head1 SEE ALSO |
92 | |
93 | L<DBIx::Class::Schema/txn_scope_guard>. |
94 | |
95 | =head1 AUTHOR |
96 | |
97 | Ash Berlin, 2008. |
98 | |
99 | Insipred by L<Scope::Guard> by chocolateboy. |
100 | |
101 | This module is free software. It may be used, redistributed and/or modified |
102 | under the same terms as Perl itself. |
103 | |
104 | =cut |