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# $Id: Shared.pm,v 1.4 2005/12/19 15:02:00 dk Exp $ |
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package DBIx::Roles::Shared; |
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use strict; |
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use vars qw(%instances %dsns $VERSION); |
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$VERSION = '1.00'; |
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sub connect |
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{ |
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my ( $self, undef, $dsn, $user, $pass, $attr) = @_; |
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my $inst_key = "$self"; |
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my $dsn_key = join( ' | ', $dsn, $user, $pass); |
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my $dbh; |
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if ( exists $instances{$inst_key}) { |
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# apparently, connect() without disconnect -- |
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# 1. find if the object was connected to another handle, and clean it up |
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keys %dsns; # reset each() |
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while ( my ( $k, $v) = each %dsns) { |
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my @d = grep { $_ != $self } @$v; |
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next if @d == @$v; |
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# found a connection |
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last if $k eq $dsn_key; # yes, it is trying to reconnect |
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# cleanup |
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@d ? ( @$v = @d ) : delete $dsns{$k}; |
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delete $instances{"$self"}; |
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goto DEFAULT_CONNECT; |
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} |
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# 2. reconnect and apply the new handle to all the shared objects |
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eval { $dbh = $self-> super( $dsn, $user, $pass, $attr); }; |
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my $exception = $@; |
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for my $obj (@{$dsns{$dsn_key}}) { |
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$obj-> dbh( $dbh); |
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} |
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$instances{$inst_key} = $dbh; |
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die $exception if $exception; |
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} else { |
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DEFAULT_CONNECT: |
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if ( exists $dsns{$dsn_key}) { |
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# reuse an existing connection |
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$dbh = $dsns{$dsn_key}-> [0]-> dbh; |
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} else { |
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# new connection |
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$dbh = $self-> super( $dsn, $user, $pass, $attr); |
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return undef unless $dbh; |
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$instances{$inst_key} = $dbh; |
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} |
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push @{$dsns{$dsn_key}}, $self; |
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} |
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return $dbh; |
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} |
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sub disconnect |
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{ |
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my $self = $_[0]; |
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keys %dsns; # reset each() |
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while ( my ( $k, $v) = each %dsns) { |
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my @d = grep { $_ != $self } @$v; |
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if ( @d == @$v) { |
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# not found |
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next; |
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} elsif ( @d) { |
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# remove the shared connection from the list but do not disconnect |
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@$v = @d; |
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delete $instances{"$self"}; |
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$self-> dbh( undef); # disconnect can be called twice |
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return; |
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} else { |
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# that was the last reference, disconnect |
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delete $dsns{$k}; |
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last; |
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} |
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} |
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# also disconnect if wasn't found somehow |
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delete $instances{"$self"}; |
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$self-> super(); |
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} |
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1; |
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__DATA__ |