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