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## ------------------------------------------------------------------------ |
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## |
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## $Id: Storage.pm,v 1.16 2003/01/20 16:52:13 joko Exp $ |
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## |
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## Copyright (c) 2002 Andreas Motl <andreas.motl@ilo.de> |
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## |
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## See COPYRIGHT section in pod text below for usage and distribution rights. |
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## |
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## ------------------------------------------------------------------------ |
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## |
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## $Log: Storage.pm,v $ |
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## Revision 1.16 2003/01/20 16:52:13 joko |
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## + now using 'DesignPattern::Object' to create a new 'Data::Storage::Handler::Xyz' on demand - before we did this in a hand-rolled fashion |
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## |
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## Revision 1.15 2003/01/19 03:12:59 joko |
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## + modified header |
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## - removed pod-documentation - now in 'Storage.pod' |
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## |
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## Revision 1.14 2002/12/19 16:27:59 joko |
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## - moved 'sub dropDb' to Data::Storage::Handler::DBI |
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## |
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## Revision 1.13 2002/12/17 21:54:12 joko |
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## + feature when using Tangram: |
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## + what? each object created should delivered with a globally(!?) unique identifier (GUID) besides the native tangram object id (OID) |
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## + patched Tangram::Storage (jonen) |
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## + enhanced Data::Storage::Schema::Tangram (joko) |
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## + enhanced Data::Storage::Handler::Tangram 'sub getObjectByGuid' (jonen) |
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## + how? |
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## + each concrete (non-abstract) class gets injected with an additional field/property called 'guid' - this is done (dynamically) on schema level |
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## + this property ('guid') gets filled on object creation/insertion from 'sub Tangram::Storage::_insert' using Data::UUID from CPAN |
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## + (as for now) this property can get accessed by calling 'getObjectByGuid' on the already known storage-handle used throughout the application |
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## |
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## Revision 1.12 2002/12/12 02:50:15 joko |
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## + this now (unfortunately) needs DBI for some helper functions |
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## + TODO: these have to be refactored to another scope! (soon!) |
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## |
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## Revision 1.11 2002/12/11 06:53:19 joko |
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## + updated pod |
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## |
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## Revision 1.10 2002/12/07 03:37:23 joko |
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## + updated pod |
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## |
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## Revision 1.9 2002/12/01 22:15:45 joko |
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## - sub createDb: moved to handler |
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## |
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## Revision 1.8 2002/11/29 04:48:23 joko |
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## + updated pod |
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## |
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## Revision 1.7 2002/11/17 06:07:18 joko |
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## + creating the handler is easier than proposed first - for now :-) |
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## + sub testAvailability |
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## |
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## Revision 1.6 2002/11/09 01:04:58 joko |
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## + updated pod |
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## |
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## Revision 1.5 2002/10/29 19:24:18 joko |
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## - reduced logging |
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## + added some pod |
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## |
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## Revision 1.4 2002/10/27 18:35:07 joko |
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## + added pod |
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## |
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## Revision 1.3 2002/10/25 11:40:37 joko |
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## + enhanced robustness |
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## + more logging for debug-levels |
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## + sub dropDb |
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## |
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## Revision 1.2 2002/10/17 00:04:29 joko |
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## + sub createDb |
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## + sub isConnected |
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## + bugfixes regarding "deep recursion" stuff |
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## |
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## Revision 1.1 2002/10/10 03:43:12 cvsjoko |
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## + new |
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## ------------------------------------------------------------------------ |
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|
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|
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BEGIN { |
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$Data::Storage::VERSION = 0.03; |
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} |
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|
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package Data::Storage; |
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|
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use strict; |
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use warnings; |
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|
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use Data::Dumper; |
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# FIXME: wipe out! |
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use DBI; |
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|
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use Data::Storage::Locator; |
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use DesignPattern::Object; |
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|
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|
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# TODO: actually implement level (integrate with Log::Dispatch) |
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my $TRACELEVEL = 0; |
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|
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# get logger instance |
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my $logger = Log::Dispatch::Config->instance; |
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|
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sub new { |
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my $invocant = shift; |
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my $class = ref($invocant) || $invocant; |
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#my @args = normalizeArgs(@_); |
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|
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my $arg_locator = shift; |
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my $arg_options = shift; |
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|
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if (!$arg_locator) { |
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$logger->critical( __PACKAGE__ . "->new: No locator passed in!" ); |
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return; |
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} |
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|
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#my $self = { STORAGEHANDLE => undef, @_ }; |
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my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options }; |
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#$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" ); |
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$logger->debug( __PACKAGE__ . "[$arg_locator->{type}]" . "->new(@_)" ); |
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return bless $self, $class; |
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} |
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|
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sub AUTOLOAD { |
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|
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# since this is a core function acting as dispatcher to $self->{STORAGEHANDLE}, |
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# some sophisticated handling and filtering is needed to avoid things like |
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# - Deep recursion on subroutine "Data::Storage::AUTOLOAD" |
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# - Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD" |
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# - Deep recursion on anonymous subroutine at [...] |
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# we also might filter log messages caused by logging to itself in "advanced logging of AUTOLOAD calls" |
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|
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my $self = shift; |
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our $AUTOLOAD; |
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|
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# ->DESTROY would - if not declared - trigger an AUTOLOAD also |
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return if $AUTOLOAD =~ m/::DESTROY$/; |
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|
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my $method = $AUTOLOAD; |
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$method =~ s/^.*:://; |
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|
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# advanced logging of AUTOLOAD calls ... |
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# ... nice but do it only when TRACING (TODO) is enabled |
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my $logstring = ""; |
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$logstring .= __PACKAGE__ . "[$self->{locator}->{type}]" . "->" . $method; |
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#print "count: ", $#_, "\n"; |
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#$logstring .= Dumper(@_) if ($#_ != -1); |
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my $tabcount = int( (80 - length($logstring)) / 10 ); |
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$logstring .= "\t" x $tabcount . "(AUTOLOAD)"; |
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# TODO: only ok if logstring doesn't contain |
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# e.g. "Data::Storage[Tangram]->insert(SystemEvent=HASH(0x5c0034c)) (AUTOLOAD)" |
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# but that would be _way_ too specific as long as we don't have an abstract handler for this ;) |
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if ($TRACELEVEL) { |
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$logger->debug( $logstring ); |
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#print join('; ', @_); |
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} |
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|
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# filtering AUTOLOAD calls and first-time-touch of the actual storage impl |
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if ($self->_filter_AUTOLOAD($method)) { |
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#print "=== FILTER!", "\n"; |
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$self->_accessStorageHandle(); |
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if ($self->{STORAGEHANDLE}) { |
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return $self->{STORAGEHANDLE}->$method(@_); |
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} else { |
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$logger->critical( __PACKAGE__ . "->AUTOLOAD: ERROR: " . $logstring ); |
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return; |
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} |
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} |
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|
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} |
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|
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sub _filter_AUTOLOAD { |
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my $self = shift; |
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my $method = shift; |
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if ($self->{options}->{protected}) { |
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if ($method eq 'disconnect') { |
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return; |
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} |
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} |
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return 1; |
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} |
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|
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|
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sub normalizeArgs { |
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my %args = @_; |
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if (!$args{dsn} && $args{meta}{dsn}) { |
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$args{dsn} = $args{meta}{dsn}; |
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} |
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my @result = %args; |
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return @result; |
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} |
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|
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sub _accessStorageHandle { |
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my $self = shift; |
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# TODO: to some tracelevel! |
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#print "=========== _accessStorage", "\n"; |
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if ($TRACELEVEL) { |
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$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->_accessStorageHandle()" ); |
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} |
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if (!$self->{STORAGEHANDLE}) { |
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return $self->_createStorageHandle(); |
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} |
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} |
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|
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sub _createStorageHandle1 { |
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my $self = shift; |
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my $type = $self->{locator}->{type}; |
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$logger->debug( __PACKAGE__ . "[$type]" . "->_createStorageHandle()" ); |
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|
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my $pkg = "Data::Storage::Handler::" . $type . ""; |
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|
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# try to load perl module at runtime |
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my $evalstr = "use $pkg;"; |
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eval($evalstr); |
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if ($@) { |
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$logger->error( __PACKAGE__ . "[$type]" . "->_createStorageHandle(): $@" ); |
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return; |
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} |
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|
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# build up some additional arguments to pass on |
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#my @args = %{$self->{locator}}; |
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my @args = (); |
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|
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# - create new storage handle object |
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# - propagate arguments to handler |
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# - pass locator by reference to be able to store status- or meta-information in it |
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$self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args ); |
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|
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} |
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|
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sub _createStorageHandle { |
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my $self = shift; |
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my $type = $self->{locator}->{type}; |
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$logger->debug( __PACKAGE__ . "[$type]" . "->_createStorageHandle()" ); |
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|
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#print Dumper($self); |
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#exit; |
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|
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my $pkg = "Data::Storage::Handler::" . $type . ""; |
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|
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# try to load perl module at runtime |
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=pod |
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my $evalstr = "use $pkg;"; |
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eval($evalstr); |
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if ($@) { |
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$logger->error( __PACKAGE__ . "[$type]" . "->_createStorageHandle(): $@" ); |
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return; |
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} |
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|
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# build up some additional arguments to pass on |
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#my @args = %{$self->{locator}}; |
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my @args = (); |
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|
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# - create new storage handle object |
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# - propagate arguments to handler |
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# - pass locator by reference to be able to store status- or meta-information in it |
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$self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args ); |
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=cut |
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|
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$self->{STORAGEHANDLE} = DesignPattern::Object->fromPackage( $pkg, locator => $self->{locator} ); |
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return 1; |
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|
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} |
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|
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sub addLogDispatchHandler { |
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|
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my $self = shift; |
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my $name = shift; |
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my $package = shift; |
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my $logger1 = shift; |
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my $objectCreator = shift; |
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|
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#$logger->add( Log::Dispatch::Tangram->new( name => $name, |
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$logger->add( $package->new( name => $name, |
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#min_level => 'debug', |
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min_level => 'info', |
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storage => $self, |
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objectCreator => $objectCreator, |
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fields => { |
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message => 'usermsg', |
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timestamp => 'stamp', |
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level => 'level', |
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name => 'code', |
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}, |
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filter_patterns => [ '->insert\(SystemEvent=' ], |
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#filter_patterns => [ 'SystemEvent' ], |
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|
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#format => '[%d] [%p] %m%n', |
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) ); |
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|
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} |
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|
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sub removeLogDispatchHandler { |
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my $self = shift; |
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my $name = shift; |
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#my $logger = shift; |
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$logger->remove($name); |
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} |
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|
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=pod |
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sub getDbName { |
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my $self = shift; |
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my $dsn = $self->{locator}->{dbi}->{dsn}; |
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$dsn =~ m/database=(.+?);/; |
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my $database_name = $1; |
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return $database_name; |
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} |
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|
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sub testAvailability { |
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my $self = shift; |
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my $status = $self->testDsn(); |
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$self->{locator}->{status}->{available} = $status; |
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return $status; |
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} |
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|
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sub isConnected { |
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my $self = shift; |
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# TODO: REVIEW! |
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return 1 if $self->{STORAGEHANDLE}; |
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} |
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|
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sub testDsn { |
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my $self = shift; |
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my $dsn = $self->{locator}->{dbi}->{dsn}; |
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my $result; |
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if ( my $dbh = DBI->connect($dsn, '', '', { |
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PrintError => 0, |
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} ) ) { |
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|
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# TODO: REVIEW |
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$dbh->disconnect(); |
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|
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return 1; |
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} else { |
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$logger->warning( __PACKAGE__ . "[$self->{locator}->{type}]" . "->testDsn(): " . "DBI-error: " . $DBI::errstr ); |
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} |
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} |
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=cut |
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|
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1; |
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__END__ |
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