6 use warnings FATAL => 'all';
8 our $VERSION = q(1.0014);
13 use DBM::Deep::Engine;
17 '""' => sub { overload::StrVal( $_[0] ) },
20 use constant DEBUG => 0;
23 # Setup constants for users to pass to new()
25 sub TYPE_HASH () { DBM::Deep::Engine->SIG_HASH }
26 sub TYPE_ARRAY () { DBM::Deep::Engine->SIG_ARRAY }
28 # This is used in all the children of this class in their TIE<type> methods.
35 $proto->_throw_error( "Odd number of parameters to " . (caller(1))[2] );
40 unless ( eval { local $SIG{'__DIE__'}; %{$_[0]} || 1 } ) {
41 $proto->_throw_error( "Not a hashref in args to " . (caller(1))[2] );
46 $args = { file => shift };
54 # Class constructor method for Perl OO interface.
55 # Calls tie() and returns blessed reference to tied hash or array,
56 # providing a hybrid OO/tie interface.
59 my $args = $class->_get_args( @_ );
62 # Check if we want a tied hash or array.
65 if (defined($args->{type}) && $args->{type} eq TYPE_ARRAY) {
66 $class = 'DBM::Deep::Array';
67 require DBM::Deep::Array;
68 tie @$self, $class, %$args;
71 $class = 'DBM::Deep::Hash';
72 require DBM::Deep::Hash;
73 tie %$self, $class, %$args;
76 return bless $self, $class;
79 # This initializer is called from the various TIE* methods. new() calls tie(),
80 # which allows for a single point of entry.
85 # locking implicitly enables autoflush
86 if ($args->{locking}) { $args->{autoflush} = 1; }
88 # These are the defaults to be optionally overridden below
96 $args->{engine} = DBM::Deep::Engine->new( { %{$args}, obj => $self } )
97 unless exists $args->{engine};
99 # Grab the parameters we want to use
100 foreach my $param ( keys %$self ) {
101 next unless exists $args->{$param};
102 $self->{$param} = $args->{$param};
106 local $SIG{'__DIE__'};
108 $self->lock_exclusive;
109 $self->_engine->setup_fh( $self );
113 eval { local $SIG{'__DIE__'}; $self->unlock; };
122 require DBM::Deep::Hash;
123 return DBM::Deep::Hash->TIEHASH( @_ );
128 require DBM::Deep::Array;
129 return DBM::Deep::Array->TIEARRAY( @_ );
133 my $self = shift->_get_self;
134 return $self->_engine->lock_exclusive( $self, @_ );
136 *lock = \&lock_exclusive;
138 my $self = shift->_get_self;
139 return $self->_engine->lock_shared( $self, @_ );
143 my $self = shift->_get_self;
144 return $self->_engine->unlock( $self, @_ );
148 my $self = shift->_get_self;
149 my ($spot, $value) = @_;
155 # This assumes hash or array only. This is a bad assumption moving forward.
157 my $r = Scalar::Util::reftype( $value );
159 if ( $r eq 'ARRAY' ) {
160 $tied = tied(@$value);
163 $tied = tied(%$value);
166 if ( eval { local $SIG{__DIE__}; $tied->isa( 'DBM::Deep' ) } ) {
167 ${$spot} = $tied->_repr;
168 $tied->_copy_node( ${$spot} );
171 if ( $r eq 'ARRAY' ) {
172 ${$spot} = [ @{$value} ];
175 ${$spot} = { %{$value} };
179 my $c = Scalar::Util::blessed( $value );
180 if ( defined $c && !$c->isa( 'DBM::Deep') ) {
181 ${$spot} = bless ${$spot}, $c
189 # die "Must be implemented in a child class\n";
193 # die "Must be implemented in a child class\n";
198 # Recursively export into standard Perl hashes and arrays.
200 my $self = shift->_get_self;
202 my $temp = $self->_repr;
204 $self->lock_exclusive;
205 $self->_copy_node( $temp );
208 my $classname = $self->_engine->get_classname( $self );
209 if ( defined $classname ) {
210 bless $temp, $classname;
216 sub _check_legality {
220 my $r = Scalar::Util::reftype( $val );
222 return $r if !defined $r || '' eq $r;
223 return $r if 'HASH' eq $r;
224 return $r if 'ARRAY' eq $r;
226 DBM::Deep->_throw_error(
227 "Storage of references of type '$r' is not supported."
232 # Perl calls import() on use -- ignore
233 return if !ref $_[0];
235 my $self = shift->_get_self;
238 my $type = $self->_check_legality( $struct );
240 DBM::Deep->_throw_error( "Cannot import a scalar" );
243 if ( substr( $type, 0, 1 ) ne $self->_type ) {
244 DBM::Deep->_throw_error(
245 "Cannot import " . ('HASH' eq $type ? 'a hash' : 'an array')
246 . " into " . ('HASH' eq $type ? 'an array' : 'a hash')
255 my $obj = 'HASH' eq Scalar::Util::reftype( $db ) ? tied(%$db) : tied(@$db);
258 my $r = $self->_check_legality( $val );
259 if ( 'HASH' eq $r ) {
260 while ( my ($k, $v) = each %$val ) {
261 my $r = $self->_check_legality( $v );
263 my $temp = 'HASH' eq $r ? {} : [];
264 if ( my $c = Scalar::Util::blessed( $v ) ) {
267 $obj->put( $k, $temp );
268 $recurse->( $temp, $v );
275 elsif ( 'ARRAY' eq $r ) {
276 foreach my $k ( 0 .. $#$val ) {
278 my $r = $self->_check_legality( $v );
280 my $temp = 'HASH' eq $r ? {} : [];
281 if ( my $c = Scalar::Util::blessed( $v ) ) {
284 $obj->put( $k, $temp );
285 $recurse->( $temp, $v );
293 $recurse->( $self, $struct );
298 #XXX Need to keep track of who has a fh to this file in order to
299 #XXX close them all prior to optimize on Win32/cygwin
302 # Rebuild entire database into new file, then move
303 # it back on top of original.
305 my $self = shift->_get_self;
307 #XXX Need to create a new test for this
308 # if ($self->_engine->storage->{links} > 1) {
309 # $self->_throw_error("Cannot optimize: reference count is greater than 1");
312 #XXX Do we have to lock the tempfile?
314 #XXX Should we use tempfile() here instead of a hard-coded name?
315 my $temp_filename = $self->_engine->storage->{file} . '.tmp';
316 my $db_temp = DBM::Deep->new(
317 file => $temp_filename,
318 type => $self->_type,
320 # Bring over all the parameters that we need to bring over
321 ( map { $_ => $self->_engine->$_ } qw(
322 byte_size max_buckets data_sector_size num_txns
326 $self->lock_exclusive;
327 $self->_engine->clear_cache;
328 $self->_copy_node( $db_temp );
329 $db_temp->_engine->storage->close;
333 # Attempt to copy user, group and permissions over to new file
335 $self->_engine->storage->copy_stats( $temp_filename );
337 # q.v. perlport for more information on this variable
338 if ( $^O eq 'MSWin32' || $^O eq 'cygwin' ) {
340 # Potential race condition when optmizing on Win32 with locking.
341 # The Windows filesystem requires that the filehandle be closed
342 # before it is overwritten with rename(). This could be redone
346 $self->_engine->storage->close;
349 if (!rename $temp_filename, $self->_engine->storage->{file}) {
350 unlink $temp_filename;
352 $self->_throw_error("Optimize failed: Cannot copy temp file over original: $!");
356 $self->_engine->storage->close;
358 $self->_engine->storage->open;
359 $self->lock_exclusive;
360 $self->_engine->setup_fh( $self );
368 # Make copy of object and return
370 my $self = shift->_get_self;
372 return DBM::Deep->new(
373 type => $self->_type,
374 base_offset => $self->_base_offset,
375 staleness => $self->_staleness,
376 engine => $self->_engine,
380 #XXX Migrate this to the engine, where it really belongs and go through some
381 # API - stop poking in the innards of someone else..
383 my %is_legal_filter = map {
386 store_key store_value
387 fetch_key fetch_value
391 my $self = shift->_get_self;
395 if ( $is_legal_filter{$type} ) {
396 $self->_engine->storage->{"filter_$type"} = $func;
403 sub filter_store_key { $_[0]->set_filter( store_key => $_[1] ); }
404 sub filter_store_value { $_[0]->set_filter( store_value => $_[1] ); }
405 sub filter_fetch_key { $_[0]->set_filter( fetch_key => $_[1] ); }
406 sub filter_fetch_value { $_[0]->set_filter( fetch_value => $_[1] ); }
410 my $self = shift->_get_self;
411 $self->lock_exclusive;
412 my $rv = eval { $self->_engine->begin_work( $self, @_ ) };
420 my $self = shift->_get_self;
421 $self->lock_exclusive;
422 my $rv = eval { $self->_engine->rollback( $self, @_ ) };
430 my $self = shift->_get_self;
431 $self->lock_exclusive;
432 my $rv = eval { $self->_engine->commit( $self, @_ ) };
444 my $self = $_[0]->_get_self;
445 return $self->{engine};
449 my $self = $_[0]->_get_self;
450 return $self->{type};
454 my $self = $_[0]->_get_self;
455 return $self->{base_offset};
459 my $self = $_[0]->_get_self;
460 return $self->{staleness};
470 my @caller = caller( ++$n );
471 next if $caller[0] =~ m/^DBM::Deep/;
473 die "DBM::Deep: $_[1] at $0 line $caller[2]\n";
479 # Store single hash key/value or array element in database.
481 my $self = shift->_get_self;
482 my ($key, $value) = @_;
483 warn "STORE($self, $key, @{[defined$value?$value:'undef']})\n" if DEBUG;
485 unless ( $self->_engine->storage->is_writable ) {
486 $self->_throw_error( 'Cannot write to a readonly filehandle' );
489 $self->lock_exclusive;
491 # User may be storing a complex value, in which case we do not want it run
492 # through the filtering system.
493 if ( !ref($value) && $self->_engine->storage->{filter_store_value} ) {
494 $value = $self->_engine->storage->{filter_store_value}->( $value );
497 $self->_engine->write_value( $self, $key, $value);
506 # Fetch single value or element given plain key or array index
508 my $self = shift->_get_self;
510 warn "FETCH($self,$key)\n" if DEBUG;
514 my $result = $self->_engine->read_value( $self, $key);
518 # Filters only apply to scalar values, so the ref check is making
519 # sure the fetched bucket is a scalar, not a child hash or array.
520 return ($result && !ref($result) && $self->_engine->storage->{filter_fetch_value})
521 ? $self->_engine->storage->{filter_fetch_value}->($result)
527 # Delete single key/value pair or element given plain key or array index
529 my $self = shift->_get_self;
531 warn "DELETE($self,$key)\n" if DEBUG;
533 unless ( $self->_engine->storage->is_writable ) {
534 $self->_throw_error( 'Cannot write to a readonly filehandle' );
537 $self->lock_exclusive;
542 my $value = $self->_engine->delete_key( $self, $key);
544 if (defined $value && !ref($value) && $self->_engine->storage->{filter_fetch_value}) {
545 $value = $self->_engine->storage->{filter_fetch_value}->($value);
555 # Check if a single key or element exists given plain key or array index
557 my $self = shift->_get_self;
559 warn "EXISTS($self,$key)\n" if DEBUG;
563 my $result = $self->_engine->key_exists( $self, $key );
572 # Clear all keys from hash, or all elements from array.
574 my $self = shift->_get_self;
575 warn "CLEAR($self)\n" if DEBUG;
577 unless ( $self->_engine->storage->is_writable ) {
578 $self->_throw_error( 'Cannot write to a readonly filehandle' );
581 $self->lock_exclusive;
583 #XXX Rewrite this dreck to do it in the engine as a tight loop vs.
584 # iterating over keys - such a WASTE - is this required for transactional
585 # clearning?! Surely that can be detected in the engine ...
586 if ( $self->_type eq TYPE_HASH ) {
587 my $key = $self->first_key;
589 # Retrieve the key before deleting because we depend on next_key
590 my $next_key = $self->next_key( $key );
591 $self->_engine->delete_key( $self, $key, $key );
596 my $size = $self->FETCHSIZE;
597 for my $key ( 0 .. $size - 1 ) {
598 $self->_engine->delete_key( $self, $key, $key );
600 $self->STORESIZE( 0 );
609 # Public method aliases
611 sub put { (shift)->STORE( @_ ) }
612 sub store { (shift)->STORE( @_ ) }
613 sub get { (shift)->FETCH( @_ ) }
614 sub fetch { (shift)->FETCH( @_ ) }
615 sub delete { (shift)->DELETE( @_ ) }
616 sub exists { (shift)->EXISTS( @_ ) }
617 sub clear { (shift)->CLEAR( @_ ) }
619 sub _dump_file {shift->_get_self->_engine->_dump_file;}