Last change
on this file since 108 was
108,
checked in by nanardon, 14 years ago
|
- use a timeout to not overload SQL server
|
File size:
1.4 KB
|
Line | |
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1 | package Sophie::Base::Async; |
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2 | |
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3 | use strict; |
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4 | use warnings; |
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5 | use DBD::Pg qw(:async); |
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6 | use Time::HiRes qw(sleep); |
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7 | |
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8 | sub new { |
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9 | my ($class, $rs, %options) = @_; |
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10 | |
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11 | my $query = $options{build} |
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12 | ? $options{build}->($rs)->as_query |
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13 | : $rs->as_query; |
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14 | my ($sql, @bind) = @{ $$query }; |
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15 | my $sth = $rs->storage->dbh->prepare( |
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16 | $sql, |
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17 | { pg_async => PG_ASYNC } |
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18 | ) or return; |
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19 | |
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20 | my $time = time; |
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21 | $sth->execute(map { $_->[1] } @bind); |
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22 | |
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23 | bless { |
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24 | rs => $rs, |
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25 | sth => $sth, |
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26 | start => $time, |
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27 | timeout => $options{timeout} || 10, |
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28 | }, $class; |
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29 | } |
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30 | |
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31 | sub DESTROY { |
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32 | my ($self) = @_; |
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33 | $self->cancel; |
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34 | } |
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35 | |
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36 | sub cancel { |
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37 | my ($self) = @_; |
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38 | if ($self->{sth}) { |
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39 | $self->{sth}->pg_cancel; |
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40 | $self->{sth} = undef; |
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41 | return 1; |
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42 | } else { |
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43 | return; |
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44 | } |
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45 | } |
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46 | |
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47 | sub result { |
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48 | my ($self) = @_; |
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49 | if (!$self->{sth}) { |
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50 | return; |
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51 | } |
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52 | if ($self->{rs}->storage->dbh->pg_ready) { |
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53 | my $sth = $self->{sth}; |
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54 | $self->{sth} = undef; |
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55 | $sth->pg_result; |
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56 | return $sth; |
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57 | } else { |
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58 | return undef; |
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59 | } |
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60 | } |
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61 | |
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62 | sub wait_result { |
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63 | my ($self) = @_; |
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64 | |
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65 | while (1) { |
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66 | if (my $res = $self->result) { |
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67 | return $res; |
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68 | } |
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69 | if (time > $self->{start} + $self->{timeout}) { |
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70 | $self->cancel; |
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71 | return; |
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72 | } |
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73 | sleep(0.25); |
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74 | } |
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75 | } |
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76 | |
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77 | 1; |
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