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comparison lib/IMPL/SQL/Schema/Processor.pm @ 407:c6e90e02dd17 ref20150831

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renamed Lib->lib
author cin
date Fri, 04 Sep 2015 19:40:23 +0300
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406:f23fcb19d3c1 407:c6e90e02dd17
1 package IMPL::SQL::Schema::Processor;
2 use strict;
3
4 use IMPL::Const qw(:prop);
5 use IMPL::declare {
6 require => {
7 Exception => 'IMPL::Exception',
8 ArgException => '-IMPL::InvalidArgumentException'
9 },
10 base => [
11 'IMPL::Object' => undef
12 ],
13 props => [
14 dbSchema => PROP_RO,
15 updateBatch => PROP_RO,
16 pendingOperations => PROP_RO
17 ]
18 };
19
20 sub CTOR {
21 my ($this,$schema) = @_;
22
23 $this->dbSchema($schema)
24 or die ArgException->new(schema => 'A DB schema is required');
25
26 $this->updateBatch([]);
27 $this->pendingOperations([]);
28 }
29
30 sub AddUpdateBatch {
31 my $this = shift;
32
33 push @{$this->updateBatch}, @_;
34 }
35
36 sub AddPendingOperations {
37 my $this = shift;
38
39 push @{$this->pendingOperations}, @_;
40 }
41
42 sub ProcessBatch {
43 my ($this,$batch) = @_;
44
45 $this->pendingOperations($batch);
46 my $i = 1;
47 while(@{$this->pendingOperations}) {
48 $batch = $this->pendingOperations;
49 $this->pendingOperations([]);
50
51 my $noChanges = 1;
52
53 foreach my $op (@$batch) {
54 if ($this->CanApplyOperation($op,$i)) {
55 $noChanges = 0;
56
57 $this->ApplyOperation($op,$i);
58 } else {
59 $this->AddPendingOperations($op);
60 }
61 }
62
63 if ($noChanges && @{$this->pendingOperations}) {
64 die Exception->new("No changes were made (iteration $i), but some operations are pending",@{$this->pendingOperations});
65 }
66
67 $i++;
68 }
69 }
70
71 sub CanApplyOperation {
72 my ($this,$op) = @_;
73
74 return $op->CanApply($this->dbSchema);
75 }
76
77 sub ApplyOperation {
78 my ($this,$op) = @_;
79
80 $op->Apply($this->dbSchema);
81 $this->AddUpdateBatch($op);
82 }
83
84 1;
85
86 __END__
87
88 =pod
89
90 =head1 NAME
91
92 =head1 SYNOPSIS
93
94 =head1 DESCRIPTION
95
96 Позволяет применит набор примитивных операций C<IMPL::SQL::Schema::Traits> к
97 схеме.
98
99 =cut