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## -------------------------------------------------------------------------------- |
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## $Id: Abstract.pm,v 1.6 2002/12/03 15:52:24 joko Exp $ |
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## -------------------------------------------------------------------------------- |
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## $Log: Abstract.pm,v $ |
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## Revision 1.6 2002/12/03 15:52:24 joko |
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## + fix/feature: if dispatching to deep core method fails (is not declared), try method at Data::Storage - level |
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## |
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## Revision 1.5 2002/12/01 22:19:33 joko |
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## + just disconnect if COREHANDLE exists |
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## |
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## Revision 1.4 2002/12/01 04:45:38 joko |
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## + sub eraseAll |
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## + sub createDb |
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## |
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## Revision 1.3 2002/11/29 04:58:20 joko |
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## + Storage::Result now uses the same dispatching mechanism like Storage::Handler |
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## |
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## Revision 1.2 2002/10/17 00:08:07 joko |
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## + bugfixes regarding "deep recursion" stuff |
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## |
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## Revision 1.1 2002/10/10 03:44:07 cvsjoko |
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## + new |
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## -------------------------------------------------------------------------------- |
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|
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|
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package Data::Storage::Handler::Abstract; |
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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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use Tie::SecureHash; |
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#use Data::Storage::Handler; |
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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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#our $lock_info; |
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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) || $invocant; |
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|
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# logging info about the actual handler called |
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$logger->debug( "$invocant->new( @_ )" ); |
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#$logger->debug( __PACKAGE__ . "->" . "new()" ); |
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|
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# V1 - arguments become properties automagically / normal perl mode blessing |
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=pod |
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# autovivify passed-in arguments as future object attributes into to-be-blessed hash |
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my $self = { @_ }; |
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# create object from blessed hash-reference |
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bless $self, $class; |
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=cut |
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|
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|
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# V2 - maybe more convenient/secure? utilizing Damian Conway's Tie::SecureHash... |
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my $self = Tie::SecureHash->new( |
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$class, |
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# that's it: |
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'metainfo' => undef, |
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'lock_info' => undef, |
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'_COREHANDLE' => undef, |
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'meta' => undef, |
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'locator' => undef, |
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'dataStorageLayer' => undef, |
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'dbi' => undef, |
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# tries: |
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#'Data::Storage::Handler::Abstract::metainfo' => undef, |
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#'dataStorageLayer' |
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#'Data::Storage::Handler::Abstract::dataStorageLayer' => undef, |
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#'Data::Storage::Handler::Tangram::dataStorageLayer' => undef, |
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#'Data::Dumper::locator' => undef, |
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#$class . '::locator' => undef, |
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#'Data::Storage::Handler::Tangram::locator' => undef, |
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#'Data::Storage::Handler::DBI::locator' => undef, |
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#_protected => , |
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#__private => , |
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); |
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|
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|
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# merge passed-in arguments to constructor as properties into already blessed secure object |
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|
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# mungle arguments from array into hash - perl does the job ;) |
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my %args = @_; |
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|
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# merge attributes one-by-one |
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# TODO: deep_copy? / merge_deep? |
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foreach (keys %args) { |
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#print "key: $_", "\n"; |
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$self->{$_} = $args{$_}; |
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} |
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|
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# V3 - rolling our own security (just for {COREHANDLE} - nothing else) - nope, Tie::SecureHash works wonderful |
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#my $self = { @_ }; |
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#bless $self, $class; |
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|
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|
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|
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# handle meta data |
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#my $metainfo = $self->getMetaInfo($class); |
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my $metainfo = $self->getMetaInfo(); |
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if (!$metainfo->{disconnectMethod}) { $metainfo->{disconnectMethod} = 'disconnect'; } |
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# type? |
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$invocant =~ s/Data::Storage::Handler:://; |
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$metainfo->{type} = $invocant; |
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|
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# direct accessible (non-protected) properties ( was: my $self = { }; ) |
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$self->{metainfo} = $metainfo; |
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|
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return $self; |
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} |
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|
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|
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sub AUTOLOAD { |
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|
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# recursion problem to be avoided here!!! |
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|
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# - problem: we get recursion-hangs!!! => perl stops with ... |
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# "Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD" at [...]/libs/Data/Storage.pm line 38." |
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|
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# - when: if we log to ourselves as a storage-implementation (e.g. via Log::Dispatch::Tangram) |
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# - why: debug-messages are on a very low level including every data-operation to "Data::Storage(::Handler::X)", |
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# so e.g. a "$storage->insert" would trigger another "$storage->insert" itself |
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# which leads to a infinite recursion loop (deep recursion) |
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# - solution: locks! (by Hack or (maybe) via Perl "local"s) |
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|
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my $self = shift; |
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|
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our $AUTOLOAD; |
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#return if $AUTOLOAD =~ m/::DESTROY$/; |
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|
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# find out methodname |
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my $methodname = $AUTOLOAD; |
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$methodname =~ s/^.*:://; |
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|
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#print "method: $methodname", "\n"; |
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|
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# TODO: document this! handler-private methods listed here will not be triggered (internal use) |
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# in this case, "exists" is a method reserved for Tie::SecureHash, |
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# which encapsulates the perl data structure (HASH) under this object |
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# this is to prevent deep recursion's |
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return if lc $methodname eq 'exists'; |
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|
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#print "$methodname - 1", "\n"; |
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|
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# TODO: enhance logging/debugging |
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#if (!$self->exists('COREHANDLE')) { return; } |
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|
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# handle locking (hack) |
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if ($self->exists('lock_info') && $self->{lock_info}->{last_method} && $methodname eq $self->{lock_info}->{last_method}) { |
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$self->{lock_info}->{log_lock} = 1; |
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} else { |
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$self->{lock_info}->{log_lock} = 0; |
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} |
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$self->{lock_info}->{last_method} = $methodname; |
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|
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#print "$methodname - 2", "\n"; |
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|
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#print Dumper($self); |
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#exit; |
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|
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# get corehandle instance from underlying handler |
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my $core = $self->getCOREHANDLE(); |
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|
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# test for COREHANDLE |
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#if (!$self->{_COREHANDLE}) { |
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#=pod |
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#if (!$self->exists('_COREHANDLE')) { |
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#if (!$self->{_COREHANDLE}) { |
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if (!$core) { |
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my $err_msg_core = __PACKAGE__ . "[$self->{metainfo}->{type}]" . ": " . "COREHANDLE is undefined while trying to execute method \"$methodname\""; |
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print $err_msg_core, "\n"; |
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if ($self->exists('lock_info') && !$self->{lock_info}->{log_lock}) { |
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$logger->error( $err_msg_core ); |
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} |
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return; |
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} |
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#=cut |
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|
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#print "$methodname - 3", "\n"; |
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|
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# try to dispatch method-call to Storage::Handler::* |
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#if ($self->can($methodname)) { |
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#$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->" . $methodname . "(@_)" ); |
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#my $res = $self->$methodname(@_); |
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#if ($res) { return $res; } |
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#} |
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|
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#print "$methodname - 4", "\n"; |
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|
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# try to dispatch method-call to COREHANDLE |
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# was: |
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#my $core = $self->{_COREHANDLE}; |
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# is: |
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#my $core = $self->getCOREHANDLE(); |
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|
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#print Dumper($core); |
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#exit; |
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|
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# was: |
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#if ($self->{_COREHANDLE}->can($methodname) || $self->{_COREHANDLE}->can("AUTOLOAD")) { |
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# is: |
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if ($core->can($methodname) || $core->can("AUTOLOAD")) { |
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#$logger->debug( __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" ); |
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#$lock_AUTOLOAD = 1 if ($methodname eq 'insert'); |
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if (!$self->{lock_info}->{log_lock}) { |
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#print "method: $methodname", "\n"; |
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$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->" . $methodname . "(@_)" ); |
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} else { |
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# AUTOLOAD - sub is locked to prevent deep recursions if (e.g.) db-inserts cause log-actions to same db itself |
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} |
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#$lock_AUTOLOAD = 0; |
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#$logger->log( level => 'debug', message => __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" ); |
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|
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#print "calling: $methodname", "\n"; |
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|
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# method calls doing it until here will get dispatched to the proper handler |
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return $core->$methodname(@_); |
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|
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} elsif ($self->can($methodname)) { |
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return $self->$methodname(@_); |
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} |
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|
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} |
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|
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sub DESTROY { |
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my $self = shift; |
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#if ($self->{COREHANDLE}) { |
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if ($self->exists('_COREHANDLE')) { |
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$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->DESTROY" ); |
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|
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my $disconnectMethod = $self->{metainfo}->{disconnectMethod}; |
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|
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# call "disconnect" or alike on COREHANDLE |
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# was: $self->{COREHANDLE}->disconnect(); |
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$disconnectMethod && $self->{_COREHANDLE} && ( $self->{_COREHANDLE}->$disconnectMethod() ); |
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|
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undef $self->{_COREHANDLE}; |
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} |
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} |
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|
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|
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sub _abstract_function { |
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my $self = shift; |
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my $fName = shift; |
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my $class = ref($self); |
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# was: |
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# $logger->error( __PACKAGE__ . ": function \"$fName\" is an abstract method, please implement it in \"$class\""); |
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# is: |
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die( __PACKAGE__ . ": function \"$fName\" is an abstract method, please implement it in \"$class\""); |
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#exit; |
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} |
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|
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sub _typeCheck2 { |
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my $type = shift; |
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print "type: $type"; |
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eval("use Data::Storage::$type;"); |
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} |
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|
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|
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# ==================================================== |
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# PUBLIC METHODS |
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# ==================================================== |
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|
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sub existsChildNode { |
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my $self = shift; |
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my $nodename = shift; |
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#$nodename = 'TransactionRoutingTable'; |
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$logger->debug( __PACKAGE__ . "->getChildNode( nodename $nodename )" ); |
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$self->getChildNodes() unless $self->{meta}->{childnodes}; |
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my $result = grep(m/$nodename/i, @{$self->{meta}->{childnodes}}); # TODO: use "/i" only on win32-systems! |
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return $result; |
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} |
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|
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sub connect_tmp { |
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|
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# my $self = shift; |
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# my $connectionString = shift; |
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# # todo: patch connectionString to $args |
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# _typeCheck($self->{args}{type}); |
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|
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} |
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|
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|
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# ==================================================== |
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# CONCRETE METHOD DUMMIES (croaking via "$logger" by calling "_abstract_function") |
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# ==================================================== |
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|
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# TODO: |
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# - abstract "abstract methods" to list/hash to be used in AUTOLOAD |
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# e.g.: my @ABSTRACT_METHODS = (qw( connect sendCommand getChildNodes )); |
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# use Class::XYZ (Construct) |
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# - build them via anonymous subs |
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# - introduce them via symbols |
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|
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sub getCOREHANDLE { |
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my $self = shift; |
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$self->_abstract_function('getCOREHANDLE'); |
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} |
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|
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sub sendCommand { |
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my $self = shift; |
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$self->_abstract_function('sendCommand'); |
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} |
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|
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sub existsChildNode_tmp { |
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my $self = shift; |
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$self->_abstract_function('existsChildNode'); |
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} |
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|
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sub getChildNodes { |
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my $self = shift; |
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$self->_abstract_function('getChildNodes'); |
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} |
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|
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sub configureCOREHANDLE { |
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my $self = shift; |
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$self->_abstract_function('configureCOREHANDLE'); |
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} |
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|
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sub getMetaInfo { |
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my $self = shift; |
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$self->_abstract_function('getMetaInfo'); |
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return; |
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} |
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|
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sub getListUnfiltered { |
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my $self = shift; |
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$self->_abstract_function('getListUnfiltered'); |
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return; |
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} |
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|
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sub getListFiltered { |
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my $self = shift; |
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$self->_abstract_function('getListFiltered'); |
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return; |
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} |
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|
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sub sendQuery { |
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my $self = shift; |
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$self->_abstract_function('sendQuery'); |
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return; |
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} |
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|
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sub connect { |
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my $self = shift; |
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$self->_abstract_function('connect'); |
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return; |
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} |
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|
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sub testIntegrity { |
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my $self = shift; |
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$self->_abstract_function('testIntegrity'); |
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return; |
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} |
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|
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sub quoteSql { |
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my $self = shift; |
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$self->_abstract_function('quoteSql'); |
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return; |
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} |
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|
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sub eraseAll { |
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my $self = shift; |
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$self->_abstract_function('eraseAll'); |
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return; |
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} |
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|
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sub createDb { |
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my $self = shift; |
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$self->_abstract_function('createDb'); |
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return; |
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} |
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|
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1; |
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