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################################# |
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# |
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# $Id: Abstract.pm,v 1.1 2002/10/10 03:44:07 cvsjoko Exp $ |
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# |
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# $Log: Abstract.pm,v $ |
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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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|
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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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|
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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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# handle meta data |
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my $metainfo = _getMetaInfo($class); |
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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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# create object from blessed hash-reference |
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# direct accessible (non-protected) properties ( was: my $self = { }; ) |
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my $self = { metainfo => $metainfo, @_ }; |
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bless $self, $class; |
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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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# handle locking (hack) |
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if ($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} = $methodname; |
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|
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# test for COREHANDLE |
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if (!$self->{COREHANDLE}) { |
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#print "no COREHANDLE", "\n"; |
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if (!$self->{lock_info}->{log_lock}) { |
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$logger->error( __PACKAGE__ . "[$self->{metainfo}->{type}]" . ": " . "COREHANDLE is undefined while trying to execute method \"$methodname\"" ); |
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} |
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return; |
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} |
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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 $res; } |
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#} |
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|
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# try to dispatch method-call to COREHANDLE |
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if ($self->{COREHANDLE}->can($methodname) || $self->{COREHANDLE}->can("AUTOLOAD")) { |
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#$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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return $self->{COREHANDLE}->$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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$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->DESTROY" ); |
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|
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my $disconnectMethod = $self->{metainfo}->{disconnectMethod}; |
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# call "disconnect" or alike on COREHANDLE |
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# was: $self->{COREHANDLE}->disconnect(); |
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$disconnectMethod && ( $self->{COREHANDLE}->$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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$logger->error( __PACKAGE__ . ": function \"$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 _typeCheck { |
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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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sub _getMetaInfo { |
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my $packagename = shift; |
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#return $self->$metainfo; |
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|
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my $ns = '$' . $packagename . "::metainfo"; |
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$logger->debug( __PACKAGE__ . "->" . "_getMetaInfo()" . " " . "[$ns]" ); |
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return eval($ns); |
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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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# TODO: 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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|
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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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$logger->debug( "\"connect\" has to be implemented by handler!" ); |
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return; |
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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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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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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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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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1; |
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