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#********************************************************************* |
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#*** ResourcePool::LoadBalancer::FailOver |
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#*** Copyright (c) 2002,2003 by Markus Winand |
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#*** $Id: FailOver.pm,v 1.4 2013-04-16 10:14:44 mws Exp $ |
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#********************************************************************* |
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package ResourcePool::LoadBalancer::FailOver; |
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use vars qw($VERSION @ISA); |
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use ResourcePool::LoadBalancer; |
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$VERSION = "1.0107"; |
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push @ISA, "ResourcePool::LoadBalancer"; |
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sub get_once($) { |
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my ($self) = @_; |
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my ($rec, $r_pool); |
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my $i = $self->{failover_pos}; |
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100
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if (! defined $i) { |
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$i = 0; |
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} |
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my $try = $self->{PoolArraySize}; |
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do { # get first not suspended pool |
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$r_pool = $self->{PoolArray}->[$i % $self->{PoolArraySize}]; |
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$i++; |
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} while (defined $r_pool && $self->chk_suspend($r_pool) && ($try-- > 0)) ; |
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if (defined $r_pool) { # |
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$rec = $r_pool->{pool}->get(); |
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if (! defined $rec) { |
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$self->suspend($r_pool); |
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} |
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if (defined $self->{LastUsedPool} && $r_pool != $self->{LastUsedPool}) { |
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$self->{LastUsedPool}->{pool}->downsize(); |
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} |
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$self->{LastUsedPool} = $r_pool; |
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} |
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if (! defined $rec) { |
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undef $r_pool; |
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} |
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$self->{failover_pos} = ($i - 1) % $self->{PoolArraySize}; |
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return ($rec, $r_pool); |
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} |
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sub free_policy($$) { |
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0
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my ($self, $r_pool) = @_; |
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if ($r_pool != $self->{LastUsedPool}) { |
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0
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$self->{LastUsedPool}->{pool}->downsize(); |
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} |
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return 1; |
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} |
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1; |