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PK /�!\3<ȍ% % rush.pmnu �[��� package DBD::Gofer::Policy::rush; # $Id: rush.pm 10087 2007-10-16 12:42:37Z Tim $ # # Copyright (c) 2007, Tim Bunce, Ireland # # You may distribute under the terms of either the GNU General Public # License or the Artistic License, as specified in the Perl README file. use strict; use warnings; our $VERSION = "0.010088"; use base qw(DBD::Gofer::Policy::Base); __PACKAGE__->create_policy_subs({ # always use connect_cached on server connect_method => 'connect_cached', # use same methods on server as is called on client # (because code not using placeholders would bloat the sth cache) prepare_method => '', # Skipping the connect check is fast, but it also skips # fetching the remote dbh attributes! # Make sure that your application doesn't need access to dbh attributes. skip_connect_check => 1, # most code doesn't rely on sth attributes being set after prepare skip_prepare_check => 1, # we're happy to use local method if that's the same as the remote skip_default_methods => 1, # ping is almost meaningless for DBD::Gofer and most transports anyway skip_ping => 1, # don't update dbh attributes at all # XXX actually we currently need dbh_attribute_update for skip_default_methods to work # and skip_default_methods is more valuable to us than the cost of dbh_attribute_update dbh_attribute_update => 'none', # actually means 'first' currently #dbh_attribute_list => undef, # we'd like to set locally_* but can't because drivers differ # in a rush assume metadata doesn't change cache_tables => 1, cache_table_info => 1, cache_column_info => 1, cache_primary_key_info => 1, cache_foreign_key_info => 1, cache_statistics_info => 1, cache_get_info => 1, }); 1; =head1 NAME DBD::Gofer::Policy::rush - The 'rush' policy for DBD::Gofer =head1 SYNOPSIS $dbh = DBI->connect("dbi:Gofer:transport=...;policy=rush", ...) =head1 DESCRIPTION The C<rush> policy tries to make as few round-trips as possible. It's the opposite end of the policy spectrum to the C<pedantic> policy. Temporary docs: See the source code for list of policies and their defaults. In a future version the policies and their defaults will be defined in the pod and parsed out at load-time. =head1 AUTHOR Tim Bunce, L<http://www.tim.bunce.name> =head1 LICENCE AND COPYRIGHT Copyright (c) 2007, Tim Bunce, Ireland. All rights reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See L<perlartistic>. =cut PK /�!\�\ �: : classic.pmnu �[��� package DBD::Gofer::Policy::classic; # $Id: classic.pm 10087 2007-10-16 12:42:37Z Tim $ # # Copyright (c) 2007, Tim Bunce, Ireland # # You may distribute under the terms of either the GNU General Public # License or the Artistic License, as specified in the Perl README file. use strict; use warnings; our $VERSION = "0.010088"; use base qw(DBD::Gofer::Policy::Base); __PACKAGE__->create_policy_subs({ # always use connect_cached on server connect_method => 'connect_cached', # use same methods on server as is called on client prepare_method => '', # don't skip the connect check since that also sets dbh attributes # although this makes connect more expensive, that's partly offset # by skip_ping=>1 below, which makes connect_cached very fast. skip_connect_check => 0, # most code doesn't rely on sth attributes being set after prepare skip_prepare_check => 1, # we're happy to use local method if that's the same as the remote skip_default_methods => 1, # ping is not important for DBD::Gofer and most transports skip_ping => 1, # only update dbh attributes on first contact with server dbh_attribute_update => 'first', # we'd like to set locally_* but can't because drivers differ # get_info results usually don't change cache_get_info => 1, }); 1; =head1 NAME DBD::Gofer::Policy::classic - The 'classic' policy for DBD::Gofer =head1 SYNOPSIS $dbh = DBI->connect("dbi:Gofer:transport=...;policy=classic", ...) The C<classic> policy is the default DBD::Gofer policy, so need not be included in the DSN. =head1 DESCRIPTION Temporary docs: See the source code for list of policies and their defaults. In a future version the policies and their defaults will be defined in the pod and parsed out at load-time. =head1 AUTHOR Tim Bunce, L<http://www.tim.bunce.name> =head1 LICENCE AND COPYRIGHT Copyright (c) 2007, Tim Bunce, Ireland. All rights reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See L<perlartistic>. =cut PK /�!\�_� � pedantic.pmnu �[��� package DBD::Gofer::Policy::pedantic; # $Id: pedantic.pm 10087 2007-10-16 12:42:37Z Tim $ # # Copyright (c) 2007, Tim Bunce, Ireland # # You may distribute under the terms of either the GNU General Public # License or the Artistic License, as specified in the Perl README file. use strict; use warnings; our $VERSION = "0.010088"; use base qw(DBD::Gofer::Policy::Base); # the 'pedantic' policy is the same as the Base policy 1; =head1 NAME DBD::Gofer::Policy::pedantic - The 'pedantic' policy for DBD::Gofer =head1 SYNOPSIS $dbh = DBI->connect("dbi:Gofer:transport=...;policy=pedantic", ...) =head1 DESCRIPTION The C<pedantic> policy tries to be as transparent as possible. To do this it makes round-trips to the server for almost every DBI method call. This is the best policy to use when first testing existing code with Gofer. Once it's working well you should consider moving to the C<classic> policy or defining your own policy class. Temporary docs: See the source code for list of policies and their defaults. In a future version the policies and their defaults will be defined in the pod and parsed out at load-time. =head1 AUTHOR Tim Bunce, L<http://www.tim.bunce.name> =head1 LICENCE AND COPYRIGHT Copyright (c) 2007, Tim Bunce, Ireland. All rights reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See L<perlartistic>. =cut PK /�!\�c �� � Base.pmnu �[��� package DBD::Gofer::Policy::Base; # $Id: Base.pm 10087 2007-10-16 12:42:37Z Tim $ # # Copyright (c) 2007, Tim Bunce, Ireland # # You may distribute under the terms of either the GNU General Public # License or the Artistic License, as specified in the Perl README file. use strict; use warnings; use Carp; our $VERSION = "0.010088"; our $AUTOLOAD; my %policy_defaults = ( # force connect method (unless overridden by go_connect_method=>'...' attribute) # if false: call same method on client as on server connect_method => 'connect', # force prepare method (unless overridden by go_prepare_method=>'...' attribute) # if false: call same method on client as on server prepare_method => 'prepare', skip_connect_check => 0, skip_default_methods => 0, skip_prepare_check => 0, skip_ping => 0, dbh_attribute_update => 'every', dbh_attribute_list => ['*'], locally_quote => 0, locally_quote_identifier => 0, cache_parse_trace_flags => 1, cache_parse_trace_flag => 1, cache_data_sources => 1, cache_type_info_all => 1, cache_tables => 0, cache_table_info => 0, cache_column_info => 0, cache_primary_key_info => 0, cache_foreign_key_info => 0, cache_statistics_info => 0, cache_get_info => 0, cache_func => 0, ); my $base_policy_file = $INC{"DBD/Gofer/Policy/Base.pm"}; __PACKAGE__->create_policy_subs(\%policy_defaults); sub create_policy_subs { my ($class, $policy_defaults) = @_; while ( my ($policy_name, $policy_default) = each %$policy_defaults) { my $policy_attr_name = "go_$policy_name"; my $sub = sub { # $policy->foo($attr, ...) #carp "$policy_name($_[1],...)"; # return the policy default value unless an attribute overrides it return (ref $_[1] && exists $_[1]->{$policy_attr_name}) ? $_[1]->{$policy_attr_name} : $policy_default; }; no strict 'refs'; *{$class . '::' . $policy_name} = $sub; } } sub AUTOLOAD { carp "Unknown policy name $AUTOLOAD used"; # only warn once no strict 'refs'; *$AUTOLOAD = sub { undef }; return undef; } sub new { my ($class, $args) = @_; my $policy = {}; bless $policy, $class; } sub DESTROY { }; 1; =head1 NAME DBD::Gofer::Policy::Base - Base class for DBD::Gofer policies =head1 SYNOPSIS $dbh = DBI->connect("dbi:Gofer:transport=...;policy=...", ...) =head1 DESCRIPTION DBD::Gofer can be configured via a 'policy' mechanism that allows you to fine-tune the number of round-trips to the Gofer server. The policies are grouped into classes (which may be subclassed) and referenced by the name of the class. The L<DBD::Gofer::Policy::Base> class is the base class for all the policy classes and describes all the individual policy items. The Base policy is not used directly. You should use a policy class derived from it. =head1 POLICY CLASSES Three policy classes are supplied with DBD::Gofer: L<DBD::Gofer::Policy::pedantic> is most 'transparent' but slowest because it makes more round-trips to the Gofer server. L<DBD::Gofer::Policy::classic> is a reasonable compromise - it's the default policy. L<DBD::Gofer::Policy::rush> is fastest, but may require code changes in your applications. Generally the default C<classic> policy is fine. When first testing an existing application with Gofer it is a good idea to start with the C<pedantic> policy first and then switch to C<classic> or a custom policy, for final testing. =head1 POLICY ITEMS These are temporary docs: See the source code for list of policies and their defaults. In a future version the policies and their defaults will be defined in the pod and parsed out at load-time. See the source code to this module for more details. =head1 POLICY CUSTOMIZATION XXX This area of DBD::Gofer is subject to change. There are three ways to customize policies: Policy classes are designed to influence the overall behaviour of DBD::Gofer with existing, unaltered programs, so they work in a reasonably optimal way without requiring code changes. You can implement new policy classes as subclasses of existing policies. In many cases individual policy items can be overridden on a case-by-case basis within your application code. You do this by passing a corresponding C<<go_<policy_name>>> attribute into DBI methods by your application code. This let's you fine-tune the behaviour for special cases. The policy items are implemented as methods. In many cases the methods are passed parameters relating to the DBD::Gofer code being executed. This means the policy can implement dynamic behaviour that varies depending on the particular circumstances, such as the particular statement being executed. =head1 AUTHOR Tim Bunce, L<http://www.tim.bunce.name> =head1 LICENCE AND COPYRIGHT Copyright (c) 2007, Tim Bunce, Ireland. All rights reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See L<perlartistic>. =cut PK /�!\3<ȍ% % rush.pmnu �[��� PK /�!\�\ �: : \ classic.pmnu �[��� PK /�!\�_� � � pedantic.pmnu �[��� PK /�!\�c �� � � Base.pmnu �[��� PK # �,
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