+++ /dev/null
-package DBM::Deep::Engine;
-
-#use Sub::Caller qw( load_tag );
-
-use 5.6.0;
-
-use strict;
-
-our $VERSION = q(0.99_03);
-
-use Fcntl qw( :DEFAULT :flock );
-use Scalar::Util ();
-
-# File-wide notes:
-# * To add to bucket_size, make sure you modify the following:
-# - calculate_sizes()
-# - _get_key_subloc()
-# - add_bucket() - where the buckets are printed
-#
-# * Every method in here assumes that the _storage has been appropriately
-# safeguarded. This can be anything from flock() to some sort of manual
-# mutex. But, it's the caller's responsability to make sure that this has
-# been done.
-
-##
-# Setup file and tag signatures. These should never change.
-##
-sub SIG_FILE () { 'DPDB' }
-sub SIG_HEADER () { 'h' }
-sub SIG_INTERNAL () { 'i' }
-sub SIG_HASH () { 'H' }
-sub SIG_ARRAY () { 'A' }
-sub SIG_NULL () { 'N' }
-sub SIG_DATA () { 'D' }
-sub SIG_INDEX () { 'I' }
-sub SIG_BLIST () { 'B' }
-sub SIG_FREE () { 'F' }
-sub SIG_KEYS () { 'K' }
-sub SIG_SIZE () { 1 }
-
-# This is the transaction ID for the HEAD
-sub HEAD () { 0 }
-
-################################################################################
-#
-# This is new code. It is a complete rewrite of the engine based on a new API
-#
-################################################################################
-
-sub read_value {
- my $self = shift;
- my ($trans_id, $offset, $key, $orig_key) = @_;
-
- my $dig_key = $self->_apply_digest( $key );
- my $tag = $self->find_blist( $offset, $dig_key ) or return;
- return $self->get_bucket_value( $tag, $dig_key, $orig_key );
-}
-
-sub key_exists {
- my $self = shift;
- my ($trans_id, $offset, $key) = @_;
-
- my $dig_key = $self->_apply_digest( $key );
- # exists() returns the empty string, not undef
- my $tag = $self->find_blist( $offset, $dig_key ) or return '';
- return $self->bucket_exists( $tag, $dig_key, $key );
-}
-
-sub get_next_key {
- my $self = shift;
- my ($trans_id, $offset) = @_;
-
- # If the previous key was not specifed, start at the top and
- # return the first one found.
- my $temp;
- if ( @_ > 2 ) {
- $temp = {
- prev_md5 => $self->_apply_digest($_[2]),
- return_next => 0,
- };
- }
- else {
- $temp = {
- prev_md5 => chr(0) x $self->{hash_size},
- return_next => 1,
- };
- }
-
- return $self->traverse_index( $temp, $offset, 0 );
-}
-
-sub delete_key {
- my $self = shift;
- my ($trans_id, $offset, $key, $orig_key) = @_;
-
- my $dig_key = $self->_apply_digest( $key );
- my $tag = $self->find_blist( $offset, $dig_key ) or return;
- my $value = $self->get_bucket_value( $tag, $dig_key, $orig_key );
- $self->delete_bucket( $tag, $dig_key, $orig_key );
- return $value;
-}
-
-sub write_value {
- my $self = shift;
- my ($trans_id, $offset, $key, $value, $orig_key) = @_;
-
- my $dig_key = $self->_apply_digest( $key );
- my $tag = $self->find_blist( $offset, $dig_key, { create => 1 } );
- return $self->add_bucket( $tag, $dig_key, $key, $value, undef, $orig_key );
-}
-
-################################################################################
-#
-# Below here is the old code. It will be folded into the code above as it can.
-#
-################################################################################
-
-sub new {
- my $class = shift;
- my ($args) = @_;
-
- my $self = bless {
- long_size => 4,
- long_pack => 'N',
- data_size => 4,
- data_pack => 'N',
-
- digest => \&Digest::MD5::md5,
- hash_size => 16, # In bytes
-
- ##
- # Number of buckets per blist before another level of indexing is
- # done. Increase this value for slightly greater speed, but larger database
- # files. DO NOT decrease this value below 16, due to risk of recursive
- # reindex overrun.
- ##
- max_buckets => 16,
-
- storage => undef,
- obj => undef,
- }, $class;
-
- if ( defined $args->{pack_size} ) {
- if ( lc $args->{pack_size} eq 'small' ) {
- $args->{long_size} = 2;
- $args->{long_pack} = 'n';
- }
- elsif ( lc $args->{pack_size} eq 'medium' ) {
- $args->{long_size} = 4;
- $args->{long_pack} = 'N';
- }
- elsif ( lc $args->{pack_size} eq 'large' ) {
- $args->{long_size} = 8;
- $args->{long_pack} = 'Q';
- }
- else {
- die "Unknown pack_size value: '$args->{pack_size}'\n";
- }
- }
-
- # Grab the parameters we want to use
- foreach my $param ( keys %$self ) {
- next unless exists $args->{$param};
- $self->{$param} = $args->{$param};
- }
- Scalar::Util::weaken( $self->{obj} ) if $self->{obj};
-
- if ( $self->{max_buckets} < 16 ) {
- warn "Floor of max_buckets is 16. Setting it to 16 from '$self->{max_buckets}'\n";
- $self->{max_buckets} = 16;
- }
-
- return $self;
-}
-
-sub _storage { return $_[0]{storage} }
-
-sub _apply_digest {
- my $self = shift;
- return $self->{digest}->(@_);
-}
-
-sub calculate_sizes {
- my $self = shift;
-
- # The 2**8 here indicates the number of different characters in the
- # current hashing algorithm
- #XXX Does this need to be updated with different hashing algorithms?
- $self->{hash_chars_used} = (2**8);
- $self->{index_size} = $self->{hash_chars_used} * $self->{long_size};
-
- $self->{bucket_size} = $self->{hash_size} + $self->{long_size} * 2;
- $self->{bucket_list_size} = $self->{max_buckets} * $self->{bucket_size};
-
- $self->{key_size} = $self->{long_size} * 2;
- $self->{keyloc_size} = $self->{max_buckets} * $self->{key_size};
-
- return;
-}
-
-sub write_file_header {
- my $self = shift;
-
- my $loc = $self->_storage->request_space( length( SIG_FILE ) + 33 );
-
- $self->_storage->print_at( $loc,
- SIG_FILE,
- SIG_HEADER,
- pack('N', 1), # header version
- pack('N', 24), # header size
- pack('N4', 0, 0, 0, 0), # currently running transaction IDs
- pack('n', $self->{long_size}),
- pack('A', $self->{long_pack}),
- pack('n', $self->{data_size}),
- pack('A', $self->{data_pack}),
- pack('n', $self->{max_buckets}),
- );
-
- $self->_storage->set_transaction_offset( 13 );
-
- return;
-}
-
-sub read_file_header {
- my $self = shift;
-
- my $buffer = $self->_storage->read_at( 0, length(SIG_FILE) + 9 );
- return unless length($buffer);
-
- my ($file_signature, $sig_header, $header_version, $size) = unpack(
- 'A4 A N N', $buffer
- );
-
- unless ( $file_signature eq SIG_FILE ) {
- $self->_storage->close;
- $self->_throw_error( "Signature not found -- file is not a Deep DB" );
- }
-
- unless ( $sig_header eq SIG_HEADER ) {
- $self->_storage->close;
- $self->_throw_error( "Old file version found." );
- }
-
- my $buffer2 = $self->_storage->read_at( undef, $size );
- my ($a1, $a2, $a3, $a4, @values) = unpack( 'N4 n A n A n', $buffer2 );
-
- $self->_storage->set_transaction_offset( 13 );
-
- if ( @values < 5 || grep { !defined } @values ) {
- $self->_storage->close;
- $self->_throw_error("Corrupted file - bad header");
- }
-
- #XXX Add warnings if values weren't set right
- @{$self}{qw(long_size long_pack data_size data_pack max_buckets)} = @values;
-
- return length($buffer) + length($buffer2);
-}
-
-sub setup_fh {
- my $self = shift;
- my ($obj) = @_;
-
- # Need to remove use of $fh here
- my $fh = $self->_storage->{fh};
- flock $fh, LOCK_EX;
-
- #XXX The duplication of calculate_sizes needs to go away
- unless ( $obj->{base_offset} ) {
- my $bytes_read = $self->read_file_header;
-
- $self->calculate_sizes;
-
- ##
- # File is empty -- write header and master index
- ##
- if (!$bytes_read) {
- $self->_storage->audit( "# Database created on" );
-
- $self->write_file_header;
-
- $obj->{base_offset} = $self->_storage->request_space(
- $self->tag_size( $self->{index_size} ),
- );
-
- $self->write_tag(
- $obj->_base_offset, $obj->_type,
- chr(0)x$self->{index_size},
- );
-
- # Flush the filehandle
- my $old_fh = select $fh;
- my $old_af = $|; $| = 1; $| = $old_af;
- select $old_fh;
- }
- else {
- $obj->{base_offset} = $bytes_read;
-
- ##
- # Get our type from master index header
- ##
- my $tag = $self->load_tag($obj->_base_offset);
- unless ( $tag ) {
- flock $fh, LOCK_UN;
- $self->_throw_error("Corrupted file, no master index record");
- }
-
- unless ($obj->_type eq $tag->{signature}) {
- flock $fh, LOCK_UN;
- $self->_throw_error("File type mismatch");
- }
- }
- }
- else {
- $self->calculate_sizes;
- }
-
- #XXX We have to make sure we don't mess up when autoflush isn't turned on
- $self->_storage->set_inode;
-
- flock $fh, LOCK_UN;
-
- return 1;
-}
-
-sub tag_size {
- my $self = shift;
- my ($size) = @_;
- return SIG_SIZE + $self->{data_size} + $size;
-}
-
-sub write_tag {
- ##
- # Given offset, signature and content, create tag and write to disk
- ##
- my $self = shift;
- my ($offset, $sig, $content) = @_;
- my $size = length( $content );
-
- $self->_storage->print_at(
- $offset,
- $sig, pack($self->{data_pack}, $size), $content,
- );
-
- return unless defined $offset;
-
- return {
- signature => $sig,
- #XXX Is this even used?
- size => $size,
- start => $offset,
- offset => $offset + SIG_SIZE + $self->{data_size},
- content => $content,
- is_new => 1,
- };
-}
-
-sub load_tag {
- ##
- # Given offset, load single tag and return signature, size and data
- ##
- my $self = shift;
- my ($offset) = @_;
- print join(":",map{$_||''}caller) . " - load_tag($offset)\n" if $::DEBUG;
-
- my $storage = $self->_storage;
-
- my ($sig, $size) = unpack(
- "A $self->{data_pack}",
- $storage->read_at( $offset, SIG_SIZE + $self->{data_size} ),
- );
-
- return {
- signature => $sig,
- size => $size, #XXX Is this even used?
- start => $offset,
- offset => $offset + SIG_SIZE + $self->{data_size},
- content => $storage->read_at( undef, $size ),
- };
-}
-
-sub find_keyloc {
- my $self = shift;
- my ($tag, $transaction_id) = @_;
- $transaction_id = $self->_storage->transaction_id
- unless defined $transaction_id;
-
- for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) {
- my ($loc, $trans_id, $is_deleted) = unpack(
- "$self->{long_pack} C C",
- substr( $tag->{content}, $i * $self->{key_size}, $self->{key_size} ),
- );
-
- next if $loc != HEAD && $transaction_id != $trans_id;
- return( $loc, $is_deleted, $i * $self->{key_size} );
- }
-
- return;
-}
-
-sub add_bucket {
- ##
- # Adds one key/value pair to bucket list, given offset, MD5 digest of key,
- # plain (undigested) key and value.
- ##
- my $self = shift;
- my ($tag, $md5, $plain_key, $value, $deleted, $orig_key) = @_;
-
- # This verifies that only supported values will be stored.
- {
- my $r = Scalar::Util::reftype( $value );
-
- last if !defined $r;
- last if $r eq 'HASH';
- last if $r eq 'ARRAY';
-
- $self->_throw_error(
- "Storage of references of type '$r' is not supported."
- );
- }
-
- my $storage = $self->_storage;
-
- #ACID - This is a mutation. Must only find the exact transaction
- my ($keyloc, $offset) = $self->_find_in_buckets( $tag, $md5, 1 );
-
- my @transactions;
- if ( $storage->transaction_id == 0 ) {
- @transactions = $storage->current_transactions;
- }
-
-# $self->_release_space( $size, $subloc );
-#XXX This needs updating to use _release_space
-
- my $location;
- my $size = $self->_length_needed( $value, $plain_key );
-
- # Updating a known md5
- if ( $keyloc ) {
- my $keytag = $self->load_tag( $keyloc );
- my ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag );
-
- if ( $subloc && !$is_deleted && @transactions ) {
- my $old_value = $self->read_from_loc( $subloc, $orig_key );
- my $old_size = $self->_length_needed( $old_value, $plain_key );
-
- for my $trans_id ( @transactions ) {
- my ($loc, $is_deleted, $offset2) = $self->find_keyloc( $keytag, $trans_id );
- unless ($loc) {
- my $location2 = $storage->request_space( $old_size );
- $storage->print_at( $keytag->{offset} + $offset2,
- pack($self->{long_pack}, $location2 ),
- pack( 'C C', $trans_id, 0 ),
- );
- $self->_write_value( $location2, $plain_key, $old_value, $orig_key );
- }
- }
- }
-
- $location = $self->_storage->request_space( $size );
- #XXX This needs to be transactionally-aware in terms of which keytag->{offset} to use
- $storage->print_at( $keytag->{offset} + $offset,
- pack($self->{long_pack}, $location ),
- pack( 'C C', $storage->transaction_id, 0 ),
- );
- }
- # Adding a new md5
- else {
- my $keyloc = $storage->request_space( $self->tag_size( $self->{keyloc_size} ) );
-
- # The bucket fit into list
- if ( defined $offset ) {
- $storage->print_at( $tag->{offset} + $offset,
- $md5, pack( $self->{long_pack}, $keyloc ),
- );
- }
- # If bucket didn't fit into list, split into a new index level
- else {
- $self->split_index( $tag, $md5, $keyloc );
- }
-
- my $keytag = $self->write_tag(
- $keyloc, SIG_KEYS, chr(0)x$self->{keyloc_size},
- );
-
- $location = $self->_storage->request_space( $size );
- $storage->print_at( $keytag->{offset},
- pack( $self->{long_pack}, $location ),
- pack( 'C C', $storage->transaction_id, 0 ),
- );
-
- my $offset = 1;
- for my $trans_id ( @transactions ) {
- $storage->print_at( $keytag->{offset} + $self->{key_size} * $offset++,
- pack( $self->{long_pack}, 0 ),
- pack( 'C C', $trans_id, 1 ),
- );
- }
- }
-
- $self->_write_value( $location, $plain_key, $value, $orig_key );
-
- return 1;
-}
-
-sub _write_value {
- my $self = shift;
- my ($key_loc, $location, $key, $value, $orig_key) = @_;
-
- my $storage = $self->_storage;
-
- my $dbm_deep_obj = _get_dbm_object( $value );
- if ( $dbm_deep_obj && $dbm_deep_obj->_storage ne $storage ) {
- $self->_throw_error( "Cannot cross-reference. Use export() instead" );
- }
-
- ##
- # Write signature based on content type, set content length and write
- # actual value.
- ##
- my $r = Scalar::Util::reftype( $value ) || '';
- if ( $dbm_deep_obj ) {
- $self->write_tag( $location, SIG_INTERNAL,pack($self->{long_pack}, $dbm_deep_obj->_base_offset) );
- }
- elsif ($r eq 'HASH') {
- if ( !$dbm_deep_obj && tied %{$value} ) {
- $self->_throw_error( "Cannot store something that is tied" );
- }
- $self->write_tag( $location, SIG_HASH, chr(0)x$self->{index_size} );
- }
- elsif ($r eq 'ARRAY') {
- if ( !$dbm_deep_obj && tied @{$value} ) {
- $self->_throw_error( "Cannot store something that is tied" );
- }
- $self->write_tag( $location, SIG_ARRAY, chr(0)x$self->{index_size} );
- }
- elsif (!defined($value)) {
- $self->write_tag( $location, SIG_NULL, '' );
- }
- else {
- $self->write_tag( $location, SIG_DATA, $value );
- }
-
- ##
- # Plain key is stored AFTER value, as keys are typically fetched less often.
- ##
- $storage->print_at( undef, pack($self->{data_pack}, length($key)) . $key );
-
- # Internal references don't care about autobless
- return 1 if $dbm_deep_obj;
-
- ##
- # If value is blessed, preserve class name
- ##
- if ( $storage->{autobless} ) {
- if ( defined( my $c = Scalar::Util::blessed($value) ) ) {
- $storage->print_at( undef, chr(1), pack($self->{data_pack}, length($c)) . $c );
- }
- else {
- $storage->print_at( undef, chr(0) );
- }
- }
-
- ##
- # Tie the passed in reference so that changes to it are reflected in the
- # datafile. The use of $location as the base_offset will act as the
- # the linkage between parent and child.
- #
- # The overall assignment is a hack around the fact that just tying doesn't
- # store the values. This may not be the wrong thing to do.
- ##
- if ($r eq 'HASH') {
- my %x = %$value;
- tie %$value, 'DBM::Deep', {
- base_offset => $key_loc,
- storage => $storage,
- parent => $self->{obj},
- parent_key => $orig_key,
- };
- %$value = %x;
- bless $value, 'DBM::Deep::Hash' unless Scalar::Util::blessed( $value );
- }
- elsif ($r eq 'ARRAY') {
- my @x = @$value;
- tie @$value, 'DBM::Deep', {
- base_offset => $key_loc,
- storage => $storage,
- parent => $self->{obj},
- parent_key => $orig_key,
- };
- @$value = @x;
- bless $value, 'DBM::Deep::Array' unless Scalar::Util::blessed( $value );
- }
-
- return 1;
-}
-
-sub split_index {
- my $self = shift;
- my ($tag, $md5, $keyloc) = @_;
-
- my $storage = $self->_storage;
-
- my $loc = $storage->request_space(
- $self->tag_size( $self->{index_size} ),
- );
-
- $storage->print_at( $tag->{ref_loc}, pack($self->{long_pack}, $loc) );
-
- my $index_tag = $self->write_tag(
- $loc, SIG_INDEX,
- chr(0)x$self->{index_size},
- );
-
- my $keys = $tag->{content}
- . $md5 . pack($self->{long_pack}, $keyloc);
-
- my @newloc = ();
- BUCKET:
- # The <= here is deliberate - we have max_buckets+1 keys to iterate
- # through, unlike every other loop that uses max_buckets as a stop.
- for (my $i = 0; $i <= $self->{max_buckets}; $i++) {
- my ($key, $old_subloc) = $self->_get_key_subloc( $keys, $i );
-
- die "[INTERNAL ERROR]: No key in split_index()\n" unless $key;
- die "[INTERNAL ERROR]: No subloc in split_index()\n" unless $old_subloc;
-
- my $num = ord(substr($key, $tag->{ch} + 1, 1));
-
- if ($newloc[$num]) {
- my $subkeys = $storage->read_at( $newloc[$num], $self->{bucket_list_size} );
-
- # This is looking for the first empty spot
- my ($subloc, $offset) = $self->_find_in_buckets(
- { content => $subkeys }, '',
- );
-
- $storage->print_at(
- $newloc[$num] + $offset,
- $key, pack($self->{long_pack}, $old_subloc),
- );
-
- next;
- }
-
- my $loc = $storage->request_space(
- $self->tag_size( $self->{bucket_list_size} ),
- );
-
- $storage->print_at(
- $index_tag->{offset} + ($num * $self->{long_size}),
- pack($self->{long_pack}, $loc),
- );
-
- my $blist_tag = $self->write_tag(
- $loc, SIG_BLIST,
- chr(0)x$self->{bucket_list_size},
- );
-
- $storage->print_at( $blist_tag->{offset}, $key . pack($self->{long_pack}, $old_subloc) );
-
- $newloc[$num] = $blist_tag->{offset};
- }
-
- $self->_release_space(
- $self->tag_size( $self->{bucket_list_size} ),
- $tag->{start},
- );
-
- return 1;
-}
-
-sub read_from_loc {
- my $self = shift;
- my ($key_loc, $subloc, $orig_key) = @_;
-
- my $storage = $self->_storage;
-
- my $signature = $storage->read_at( $subloc, SIG_SIZE );
-
- ##
- # If value is a hash or array, return new DBM::Deep object with correct offset
- ##
- if (($signature eq SIG_HASH) || ($signature eq SIG_ARRAY)) {
- #XXX This needs to be a singleton
-# my $new_obj;
-# my $is_autobless;
-# if ( $signature eq SIG_HASH ) {
-# $new_obj = {};
-# tie %$new_obj, 'DBM::Deep', {
-# base_offset => $subloc,
-# storage => $self->_storage,
-# parent => $self->{obj},
-# parent_key => $orig_key,
-# };
-# $is_autobless = tied(%$new_obj)->_storage->{autobless};
-# }
-# else {
-# $new_obj = [];
-# tie @$new_obj, 'DBM::Deep', {
-# base_offset => $subloc,
-# storage => $self->_storage,
-# parent => $self->{obj},
-# parent_key => $orig_key,
-# };
-# $is_autobless = tied(@$new_obj)->_storage->{autobless};
-# }
-#
-# if ($is_autobless) {
-
- my $new_obj = DBM::Deep->new({
- type => $signature,
- base_offset => $key_loc,
- storage => $self->_storage,
- parent => $self->{obj},
- parent_key => $orig_key,
- });
-
- if ($new_obj->_storage->{autobless}) {
- ##
- # Skip over value and plain key to see if object needs
- # to be re-blessed
- ##
- $storage->increment_pointer( $self->{data_size} + $self->{index_size} );
-
- my $size = $storage->read_at( undef, $self->{data_size} );
- $size = unpack($self->{data_pack}, $size);
- if ($size) { $storage->increment_pointer( $size ); }
-
- my $bless_bit = $storage->read_at( undef, 1 );
- if ( ord($bless_bit) ) {
- my $size = unpack(
- $self->{data_pack},
- $storage->read_at( undef, $self->{data_size} ),
- );
-
- if ( $size ) {
- $new_obj = bless $new_obj, $storage->read_at( undef, $size );
- }
- }
- }
-
- return $new_obj;
- }
- elsif ( $signature eq SIG_INTERNAL ) {
- my $size = $storage->read_at( undef, $self->{data_size} );
- $size = unpack($self->{data_pack}, $size);
-
- if ( $size ) {
- my $new_loc = $storage->read_at( undef, $size );
- $new_loc = unpack( $self->{long_pack}, $new_loc );
- return $self->read_from_loc( $key_loc, $new_loc, $orig_key );
- }
- else {
- return;
- }
- }
- ##
- # Otherwise return actual value
- ##
- elsif ( $signature eq SIG_DATA ) {
- my $size = $storage->read_at( undef, $self->{data_size} );
- $size = unpack($self->{data_pack}, $size);
-
- my $value = $size ? $storage->read_at( undef, $size ) : '';
- return $value;
- }
-
- ##
- # Key exists, but content is null
- ##
- return;
-}
-
-sub get_bucket_value {
- ##
- # Fetch single value given tag and MD5 digested key.
- ##
- my $self = shift;
- my ($tag, $md5, $orig_key) = @_;
-
- #ACID - This is a read. Can find exact or HEAD
- my ($keyloc, $offset) = $self->_find_in_buckets( $tag, $md5 );
-
- if ( !$keyloc ) {
- #XXX Need to use real key
-# $self->add_bucket( $tag, $md5, $orig_key, undef, $orig_key );
-# return;
- }
-# elsif ( !$is_deleted ) {
- else {
- my $keytag = $self->load_tag( $keyloc );
- my ($subloc, $is_deleted) = $self->find_keyloc( $keytag );
- if (!$subloc && !$is_deleted) {
- ($subloc, $is_deleted) = $self->find_keyloc( $keytag, 0 );
- }
- if ( $subloc && !$is_deleted ) {
- return $self->read_from_loc( $subloc, $orig_key );
- }
- }
-
- return;
-}
-
-sub delete_bucket {
- ##
- # Delete single key/value pair given tag and MD5 digested key.
- ##
- my $self = shift;
- my ($tag, $md5, $orig_key) = @_;
-
- #ACID - Although this is a mutation, we must find any transaction.
- # This is because we need to mark something as deleted that is in the HEAD.
- my ($keyloc, $offset) = $self->_find_in_buckets( $tag, $md5 );
-
- return if !$keyloc;
-
- my $storage = $self->_storage;
-
- my @transactions;
- if ( $storage->transaction_id == 0 ) {
- @transactions = $storage->current_transactions;
- }
-
- if ( $storage->transaction_id == 0 ) {
- my $keytag = $self->load_tag( $keyloc );
-
- my ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag );
- return if !$subloc || $is_deleted;
-
- my $value = $self->read_from_loc( $subloc, $orig_key );
-
- my $size = $self->_length_needed( $value, $orig_key );
-
- for my $trans_id ( @transactions ) {
- my ($loc, $is_deleted, $offset2) = $self->find_keyloc( $keytag, $trans_id );
- unless ($loc) {
- my $location2 = $storage->request_space( $size );
- $storage->print_at( $keytag->{offset} + $offset2,
- pack($self->{long_pack}, $location2 ),
- pack( 'C C', $trans_id, 0 ),
- );
- $self->_write_value( $location2, $orig_key, $value, $orig_key );
- }
- }
-
- $keytag = $self->load_tag( $keyloc );
- ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag );
- $storage->print_at( $keytag->{offset} + $offset,
- substr( $keytag->{content}, $offset + $self->{key_size} ),
- chr(0) x $self->{key_size},
- );
- }
- else {
- my $keytag = $self->load_tag( $keyloc );
-
- my ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag );
-
- $storage->print_at( $keytag->{offset} + $offset,
- pack($self->{long_pack}, 0 ),
- pack( 'C C', $storage->transaction_id, 1 ),
- );
- }
-
- return 1;
-}
-
-sub bucket_exists {
- ##
- # Check existence of single key given tag and MD5 digested key.
- ##
- my $self = shift;
- my ($tag, $md5) = @_;
-
- #ACID - This is a read. Can find exact or HEAD
- my ($keyloc) = $self->_find_in_buckets( $tag, $md5 );
- my $keytag = $self->load_tag( $keyloc );
- my ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag );
- if ( !$subloc && !$is_deleted ) {
- ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag, 0 );
- }
- return ($subloc && !$is_deleted) && 1;
-}
-
-sub find_blist {
- ##
- # Locate offset for bucket list, given digested key
- ##
- my $self = shift;
- my ($offset, $md5, $args) = @_;
- $args = {} unless $args;
-
- ##
- # Locate offset for bucket list using digest index system
- ##
- my $tag = $self->load_tag( $offset )
- or $self->_throw_error( "INTERNAL ERROR - Cannot find tag" );
-
- #XXX What happens when $ch >= $self->{hash_size} ??
- for (my $ch = 0; $tag->{signature} ne SIG_BLIST; $ch++) {
- my $num = ord substr($md5, $ch, 1);
-
- my $ref_loc = $tag->{offset} + ($num * $self->{long_size});
- $tag = $self->index_lookup( $tag, $num );
-
- if (!$tag) {
- return if !$args->{create};
-
- my $loc = $self->_storage->request_space(
- $self->tag_size( $self->{bucket_list_size} ),
- );
-
- $self->_storage->print_at( $ref_loc, pack($self->{long_pack}, $loc) );
-
- $tag = $self->write_tag(
- $loc, SIG_BLIST,
- chr(0)x$self->{bucket_list_size},
- );
-
- $tag->{ref_loc} = $ref_loc;
- $tag->{ch} = $ch;
-
- last;
- }
-
- $tag->{ch} = $ch;
- $tag->{ref_loc} = $ref_loc;
- }
-
- return $tag;
-}
-
-sub index_lookup {
- ##
- # Given index tag, lookup single entry in index and return .
- ##
- my $self = shift;
- my ($tag, $index) = @_;
-
- my $location = unpack(
- $self->{long_pack},
- substr(
- $tag->{content},
- $index * $self->{long_size},
- $self->{long_size},
- ),
- );
-
- if (!$location) { return; }
-
- return $self->load_tag( $location );
-}
-
-sub traverse_index {
- ##
- # Scan index and recursively step into deeper levels, looking for next key.
- ##
- my $self = shift;
- my ($xxxx, $offset, $ch, $force_return_next) = @_;
-
- my $tag = $self->load_tag( $offset );
-
- if ($tag->{signature} ne SIG_BLIST) {
- my $start = $xxxx->{return_next} ? 0 : ord(substr($xxxx->{prev_md5}, $ch, 1));
-
- for (my $idx = $start; $idx < $self->{hash_chars_used}; $idx++) {
- my $subloc = unpack(
- $self->{long_pack},
- substr(
- $tag->{content},
- $idx * $self->{long_size},
- $self->{long_size},
- ),
- );
-
- if ($subloc) {
- my $result = $self->traverse_index(
- $xxxx, $subloc, $ch + 1, $force_return_next,
- );
-
- if (defined $result) { return $result; }
- }
- } # index loop
-
- $xxxx->{return_next} = 1;
- }
- # This is the bucket list
- else {
- my $keys = $tag->{content};
- if ($force_return_next) { $xxxx->{return_next} = 1; }
-
- ##
- # Iterate through buckets, looking for a key match
- ##
- my $transaction_id = $self->_storage->transaction_id;
- for (my $i = 0; $i < $self->{max_buckets}; $i++) {
- my ($key, $keyloc) = $self->_get_key_subloc( $keys, $i );
-
- # End of bucket list -- return to outer loop
- if (!$keyloc) {
- $xxxx->{return_next} = 1;
- last;
- }
- # Located previous key -- return next one found
- elsif ($key eq $xxxx->{prev_md5}) {
- $xxxx->{return_next} = 1;
- next;
- }
- # Seek to bucket location and skip over signature
- elsif ($xxxx->{return_next}) {
- my $storage = $self->_storage;
-
- my $keytag = $self->load_tag( $keyloc );
- my ($subloc, $is_deleted) = $self->find_keyloc( $keytag );
- if ( $subloc == 0 && !$is_deleted ) {
- ($subloc, $is_deleted) = $self->find_keyloc( $keytag, 0 );
- }
- next if $is_deleted;
-
- # Skip over value to get to plain key
- my $sig = $storage->read_at( $subloc, SIG_SIZE );
-
- my $size = $storage->read_at( undef, $self->{data_size} );
- $size = unpack($self->{data_pack}, $size);
- if ($size) { $storage->increment_pointer( $size ); }
-
- # Read in plain key and return as scalar
- $size = $storage->read_at( undef, $self->{data_size} );
- $size = unpack($self->{data_pack}, $size);
-
- my $plain_key;
- if ($size) { $plain_key = $storage->read_at( undef, $size); }
- return $plain_key;
- }
- }
-
- $xxxx->{return_next} = 1;
- }
-
- return;
-}
-
-# Utilities
-
-sub _get_key_subloc {
- my $self = shift;
- my ($keys, $idx) = @_;
-
- return unpack(
- # This is 'a', not 'A'. Please read the pack() documentation for the
- # difference between the two and why it's important.
- "a$self->{hash_size} $self->{long_pack}",
- substr(
- $keys,
- ($idx * $self->{bucket_size}),
- $self->{bucket_size},
- ),
- );
-}
-
-sub _find_in_buckets {
- my $self = shift;
- my ($tag, $md5) = @_;
-
- BUCKET:
- for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) {
- my ($key, $subloc) = $self->_get_key_subloc(
- $tag->{content}, $i,
- );
-
- next BUCKET if $subloc && $key ne $md5;
- return( $subloc, $i * $self->{bucket_size} );
- }
-
- return;
-}
-
-sub _release_space {
- my $self = shift;
- my ($size, $loc) = @_;
-
- my $next_loc = 0;
-
- $self->_storage->print_at( $loc,
- SIG_FREE,
- pack($self->{long_pack}, $size ),
- pack($self->{long_pack}, $next_loc ),
- );
-
- return;
-}
-
-sub _throw_error {
- die "DBM::Deep: $_[1]\n";
-}
-
-sub _get_dbm_object {
- my $item = shift;
-
- my $obj = eval {
- local $SIG{__DIE__};
- if ($item->isa( 'DBM::Deep' )) {
- return $item;
- }
- return;
- };
- return $obj if $obj;
-
- my $r = Scalar::Util::reftype( $item ) || '';
- if ( $r eq 'HASH' ) {
- my $obj = eval {
- local $SIG{__DIE__};
- my $obj = tied(%$item);
- if ($obj->isa( 'DBM::Deep' )) {
- return $obj;
- }
- return;
- };
- return $obj if $obj;
- }
- elsif ( $r eq 'ARRAY' ) {
- my $obj = eval {
- local $SIG{__DIE__};
- my $obj = tied(@$item);
- if ($obj->isa( 'DBM::Deep' )) {
- return $obj;
- }
- return;
- };
- return $obj if $obj;
- }
-
- return;
-}
-
-sub _length_needed {
- my $self = shift;
- my ($value, $key) = @_;
-
- my $is_dbm_deep = eval {
- local $SIG{'__DIE__'};
- $value->isa( 'DBM::Deep' );
- };
-
- my $len = SIG_SIZE
- + $self->{data_size} # size for value
- + $self->{data_size} # size for key
- + length( $key ); # length of key
-
- if ( $is_dbm_deep && $value->_storage eq $self->_storage ) {
- # long_size is for the internal reference
- return $len + $self->{long_size};
- }
-
- if ( $self->_storage->{autobless} ) {
- # This is for the bit saying whether or not this thing is blessed.
- $len += 1;
- }
-
- my $r = Scalar::Util::reftype( $value ) || '';
- unless ( $r eq 'HASH' || $r eq 'ARRAY' ) {
- if ( defined $value ) {
- $len += length( $value );
- }
- return $len;
- }
-
- $len += $self->{index_size};
-
- # if autobless is enabled, must also take into consideration
- # the class name as it is stored after the key.
- if ( $self->_storage->{autobless} ) {
- my $c = Scalar::Util::blessed($value);
- if ( defined $c && !$is_dbm_deep ) {
- $len += $self->{data_size} + length($c);
- }
- }
-
- return $len;
-}
-
-1;
-__END__
+++ /dev/null
-package DBM::Deep::Engine2;
-
-use base 'DBM::Deep::Engine';
-
-use 5.6.0;
-
-use strict;
-use warnings;
-
-our $VERSION = q(0.99_03);
-
-use Fcntl qw( :DEFAULT :flock );
-use Scalar::Util ();
-
-# File-wide notes:
-# * Every method in here assumes that the _storage has been appropriately
-# safeguarded. This can be anything from flock() to some sort of manual
-# mutex. But, it's the caller's responsability to make sure that this has
-# been done.
-
-# Setup file and tag signatures. These should never change.
-sub SIG_FILE () { 'DPDB' }
-sub SIG_HEADER () { 'h' }
-sub SIG_INTERNAL () { 'i' }
-sub SIG_HASH () { 'H' }
-sub SIG_ARRAY () { 'A' }
-sub SIG_NULL () { 'N' }
-sub SIG_DATA () { 'D' }
-sub SIG_INDEX () { 'I' }
-sub SIG_BLIST () { 'B' }
-sub SIG_FREE () { 'F' }
-sub SIG_KEYS () { 'K' }
-sub SIG_SIZE () { 1 }
-
-# This is the transaction ID for the HEAD
-sub HEAD () { 0 }
-
-sub read_value {
- my $self = shift;
- my ($trans_id, $base_offset, $key) = @_;
-
- my ($_val_offset, $_is_del) = $self->_find_value_offset({
- offset => $base_offset,
- trans_id => $trans_id,
- allow_head => 1,
- });
- die "Attempt to use a deleted value" if $_is_del;
- die "Internal error!" if !$_val_offset;
-
- my ($key_tag) = $self->_find_key_offset({
- offset => $_val_offset,
- key_md5 => $self->_apply_digest( $key ),
- });
- return if !$key_tag;
-
- my ($val_offset, $is_del) = $self->_find_value_offset({
- offset => $key_tag->{start},
- trans_id => $trans_id,
- allow_head => 1,
- });
- return if $is_del;
- die "Internal error!" if !$val_offset;
-
- return $self->_read_value({
- keyloc => $key_tag->{start},
- offset => $val_offset,
- key => $key,
- });
-}
-
-sub key_exists {
- my $self = shift;
- my ($trans_id, $base_offset, $key) = @_;
-
- my ($_val_offset, $_is_del) = $self->_find_value_offset({
- offset => $base_offset,
- trans_id => $trans_id,
- allow_head => 1,
- });
- die "Attempt to use a deleted value" if $_is_del;
- die "Internal error!" if !$_val_offset;
-
- my ($key_tag) = $self->_find_key_offset({
- offset => $_val_offset,
- key_md5 => $self->_apply_digest( $key ),
- });
- return '' if !$key_tag->{start};
-
- my ($val_offset, $is_del) = $self->_find_value_offset({
- offset => $key_tag->{start},
- trans_id => $trans_id,
- allow_head => 1,
- });
- die "Internal error!" if !$_val_offset;
-
- return '' if $is_del;
-
- return 1;
-}
-
-sub get_next_key {
- my $self = shift;
- my ($trans_id, $base_offset) = @_;
-
- my ($_val_offset, $_is_del) = $self->_find_value_offset({
- offset => $base_offset,
- trans_id => $trans_id,
- allow_head => 1,
- });
- die "Attempt to use a deleted value" if $_is_del;
- die "Internal error!" if !$_val_offset;
-
- # If the previous key was not specifed, start at the top and
- # return the first one found.
- my $temp;
- if ( @_ > 2 ) {
- $temp = {
- prev_md5 => $self->_apply_digest($_[2]),
- return_next => 0,
- };
- }
- else {
- $temp = {
- prev_md5 => chr(0) x $self->{hash_size},
- return_next => 1,
- };
- }
-
- local $::DEBUG = 1;
- print "get_next_key: $_val_offset\n" if $::DEBUG;
- return $self->traverse_index( $temp, $_val_offset, 0 );
-}
-
-sub delete_key {
- my $self = shift;
- my ($trans_id, $base_offset, $key) = @_;
-
- my ($_val_offset, $_is_del) = $self->_find_value_offset({
- offset => $base_offset,
- trans_id => $trans_id,
- allow_head => 1,
- });
- die "Attempt to use a deleted value" if $_is_del;
- die "Internal error!" if !$_val_offset;
-
- my ($key_tag, $bucket_tag) = $self->_find_key_offset({
- offset => $_val_offset,
- key_md5 => $self->_apply_digest( $key ),
- });
- return if !$key_tag->{start};
-
- my $value = $self->read_value( $trans_id, $base_offset, $key );
- if ( $trans_id ) {
- $self->_mark_as_deleted({
- tag => $key_tag,
- trans_id => $trans_id,
- });
- }
- else {
- if ( my @transactions = $self->_storage->current_transactions ) {
- foreach my $other_trans_id ( @transactions ) {
- next if $self->_has_keyloc_entry({
- tag => $key_tag,
- trans_id => $other_trans_id,
- });
- $self->write_value( $other_trans_id, $base_offset, $key, $value );
- }
- }
-
- $self->_mark_as_deleted({
- tag => $key_tag,
- trans_id => $trans_id,
- });
-# $self->_remove_key_offset({
-# offset => $_val_offset,
-# key_md5 => $self->_apply_digest( $key ),
-# });
- }
-
- return $value;
-}
-
-sub write_value {
- my $self = shift;
- my ($trans_id, $base_offset, $key, $value) = @_;
-
- # This verifies that only supported values will be stored.
- {
- my $r = Scalar::Util::reftype( $value );
-
- last if !defined $r;
- last if $r eq 'HASH';
- last if $r eq 'ARRAY';
-
- $self->_throw_error(
- "Storage of references of type '$r' is not supported."
- );
- }
-
- my ($_val_offset, $_is_del) = $self->_find_value_offset({
- offset => $base_offset,
- trans_id => $trans_id,
- allow_head => 1,
- });
- die "Attempt to use a deleted value" if $_is_del;
- die "Internal error!" if !$_val_offset;
-
- my ($key_tag, $bucket_tag) = $self->_find_key_offset({
- offset => $_val_offset,
- key_md5 => $self->_apply_digest( $key ),
- create => 1,
- });
- die "Cannot find/create new key offset!" if !$key_tag->{start};
-
- if ( $trans_id ) {
- if ( $key_tag->{is_new} ) {
- # Must mark the HEAD as deleted because it doesn't exist
- $self->_mark_as_deleted({
- tag => $key_tag,
- trans_id => HEAD,
- });
- }
- }
- else {
- if ( $key_tag->{is_new} ) {
- }
- else {
- my $old_value = $self->read_value( $trans_id, $base_offset, $key );
- if ( my @transactions = $self->_storage->current_transactions ) {
- foreach my $other_trans_id ( @transactions ) {
- next if $self->_has_keyloc_entry({
- tag => $key_tag,
- trans_id => $other_trans_id,
- });
- $self->write_value( $other_trans_id, $base_offset, $key, $old_value );
- }
- }
- }
- }
-
- my $value_loc = $self->_storage->request_space(
- $self->_length_needed( $value, $key ),
- );
-
- $self->_add_key_offset({
- tag => $key_tag,
- trans_id => $trans_id,
- loc => $value_loc,
- });
-
- $self->_write_value( $key_tag->{start}, $value_loc, $key, $value, $key );
-
- return 1;
-}
-
-sub _find_value_offset {
- my $self = shift;
- my ($args) = @_;
-
- my $key_tag = $self->load_tag( $args->{offset} );
-
- my @head;
- for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) {
- my ($loc, $trans_id, $is_deleted) = unpack(
- "$self->{long_pack} C C",
- substr( $key_tag->{content}, $i * $self->{key_size}, $self->{key_size} ),
- );
-
- if ( $trans_id == HEAD ) {
- @head = ($loc, $is_deleted);
- }
-
- next if $loc && $args->{trans_id} != $trans_id;
- return( $loc, $is_deleted );
- }
-
- return @head if $args->{allow_head};
- return;
-}
-
-sub _find_key_offset {
- my $self = shift;
- my ($args) = @_;
-
- my $bucket_tag = $self->load_tag( $args->{offset} )
- or $self->_throw_error( "INTERNAL ERROR - Cannot find tag" );
-
- #XXX What happens when $ch >= $self->{hash_size} ??
- for (my $ch = 0; $bucket_tag->{signature} ne SIG_BLIST; $ch++) {
- my $num = ord substr($args->{key_md5}, $ch, 1);
-
- my $ref_loc = $bucket_tag->{offset} + ($num * $self->{long_size});
- $bucket_tag = $self->index_lookup( $bucket_tag, $num );
-
- if (!$bucket_tag) {
- return if !$args->{create};
-
- my $loc = $self->_storage->request_space(
- $self->tag_size( $self->{bucket_list_size} ),
- );
-
- $self->_storage->print_at( $ref_loc, pack($self->{long_pack}, $loc) );
-
- $bucket_tag = $self->write_tag(
- $loc, SIG_BLIST,
- chr(0)x$self->{bucket_list_size},
- );
-
- $bucket_tag->{ref_loc} = $ref_loc;
- $bucket_tag->{ch} = $ch;
- $bucket_tag->{is_new} = 1;
-
- last;
- }
-
- $bucket_tag->{ch} = $ch;
- $bucket_tag->{ref_loc} = $ref_loc;
- }
-
- # Need to create a new keytag, too
- if ( $bucket_tag->{is_new} ) {
- my $keytag_loc = $self->_storage->request_space(
- $self->tag_size( $self->{keyloc_size} ),
- );
-
- substr( $bucket_tag->{content}, 0, $self->{key_size} ) =
- $args->{key_md5} . pack( "$self->{long_pack}", $keytag_loc );
-
- $self->_storage->print_at( $bucket_tag->{offset}, $bucket_tag->{content} );
-
- my $key_tag = $self->write_tag(
- $keytag_loc, SIG_KEYS,
- chr(0)x$self->{keyloc_size},
- );
-
- return( $key_tag, $bucket_tag );
- }
- else {
- my ($key, $subloc, $index);
- BUCKET:
- for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) {
- ($key, $subloc) = $self->_get_key_subloc(
- $bucket_tag->{content}, $i,
- );
-
- next BUCKET if $subloc && $key ne $args->{key_md5};
-
- # Keep track of where we are, in case we need to create a new
- # entry.
- $index = $i;
- last;
- }
-
- # If we have a subloc to return or we don't want to create a new
- # entry, we need to return now.
- $args->{create} ||= 0;
- return ($self->load_tag( $subloc ), $bucket_tag) if $subloc || !$args->{create};
-
- my $keytag_loc = $self->_storage->request_space(
- $self->tag_size( $self->{keyloc_size} ),
- );
-
- # There's space left in this bucket
- if ( defined $index ) {
- substr( $bucket_tag->{content}, $index * $self->{key_size}, $self->{key_size} ) =
- $args->{key_md5} . pack( "$self->{long_pack}", $keytag_loc );
-
- $self->_storage->print_at( $bucket_tag->{offset}, $bucket_tag->{content} );
- }
- # We need to split the index
- else {
- $self->split_index( $bucket_tag, $args->{key_md5}, $keytag_loc );
- }
-
- my $key_tag = $self->write_tag(
- $keytag_loc, SIG_KEYS,
- chr(0)x$self->{keyloc_size},
- );
-
- return( $key_tag, $bucket_tag );
- }
-
- return;
-}
-
-sub _read_value {
- my $self = shift;
- my ($args) = @_;
-
- return $self->read_from_loc( $args->{keyloc}, $args->{offset}, $args->{key} );
-}
-
-sub _mark_as_deleted {
- my $self = shift;
- my ($args) = @_;
-
- my $is_changed;
- for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) {
- my ($loc, $trans_id, $is_deleted) = unpack(
- "$self->{long_pack} C C",
- substr( $args->{tag}{content}, $i * $self->{key_size}, $self->{key_size} ),
- );
-
- last unless $loc || $is_deleted;
-
- if ( $trans_id == $args->{trans_id} ) {
- substr( $args->{tag}{content}, $i * $self->{key_size}, $self->{key_size} ) = pack(
- "$self->{long_pack} C C",
- $loc, $trans_id, 1,
- );
- $is_changed = 1;
- last;
- }
- }
-
- if ( $is_changed ) {
- $self->_storage->print_at(
- $args->{tag}{offset}, $args->{tag}{content},
- );
- }
-
- return 1;
-}
-
-sub _has_keyloc_entry {
- my $self = shift;
- my ($args) = @_;
-
- for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) {
- my ($loc, $trans_id, $is_deleted) = unpack(
- "$self->{long_pack} C C",
- substr( $args->{tag}{content}, $i * $self->{key_size}, $self->{key_size} ),
- );
-
- return 1 if $trans_id == $args->{trans_id};
- }
-
- return;
-}
-
-sub _remove_key_offset {
- my $self = shift;
- my ($args) = @_;
-
- my $is_changed;
- for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) {
- my ($loc, $trans_id, $is_deleted) = unpack(
- "$self->{long_pack} C C",
- substr( $args->{tag}{content}, $i * $self->{key_size}, $self->{key_size} ),
- );
-
- if ( $trans_id == $args->{trans_id} ) {
- substr( $args->{tag}{content}, $i * $self->{key_size}, $self->{key_size} ) = '';
- $args->{tag}{content} .= chr(0) x $self->{key_size};
- $is_changed = 1;
- redo;
- }
- }
-
- if ( $is_changed ) {
- $self->_storage->print_at(
- $args->{tag}{offset}, $args->{tag}{content},
- );
- }
-
- return 1;
-}
-
-sub _add_key_offset {
- my $self = shift;
- my ($args) = @_;
-
- my $is_changed;
- for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) {
- my ($loc, $trans_id, $is_deleted) = unpack(
- "$self->{long_pack} C C",
- substr( $args->{tag}{content}, $i * $self->{key_size}, $self->{key_size} ),
- );
-
- if ( $trans_id == $args->{trans_id} || (!$loc && !$is_deleted) ) {
- substr( $args->{tag}{content}, $i * $self->{key_size}, $self->{key_size} ) = pack(
- "$self->{long_pack} C C",
- $args->{loc}, $args->{trans_id}, 0,
- );
- $is_changed = 1;
- last;
- }
- }
-
- if ( $is_changed ) {
- $self->_storage->print_at(
- $args->{tag}{offset}, $args->{tag}{content},
- );
- }
- else {
- die "Why didn't _add_key_offset() change something?!\n";
- }
-
- return 1;
-}
-
-sub setup_fh {
- my $self = shift;
- my ($obj) = @_;
-
- # Need to remove use of $fh here
- my $fh = $self->_storage->{fh};
- flock $fh, LOCK_EX;
-
- #XXX The duplication of calculate_sizes needs to go away
- unless ( $obj->{base_offset} ) {
- my $bytes_read = $self->read_file_header;
-
- $self->calculate_sizes;
-
- ##
- # File is empty -- write header and master index
- ##
- if (!$bytes_read) {
- $self->_storage->audit( "# Database created on" );
-
- $self->write_file_header;
-
- $obj->{base_offset} = $self->_storage->request_space(
- $self->tag_size( $self->{keyloc_size} ),
- );
-
- my $value_spot = $self->_storage->request_space(
- $self->tag_size( $self->{index_size} ),
- );
-
- $self->write_tag(
- $obj->{base_offset}, SIG_KEYS,
- pack( "$self->{long_pack} C C", $value_spot, HEAD, 0 ),
- chr(0) x ($self->{index_size} - $self->{key_size}),
- );
-
- $self->write_tag(
- $value_spot, $obj->_type,
- chr(0)x$self->{index_size},
- );
-
- # Flush the filehandle
- my $old_fh = select $fh;
- my $old_af = $|; $| = 1; $| = $old_af;
- select $old_fh;
- }
- else {
- $obj->{base_offset} = $bytes_read;
-
- my ($_val_offset, $_is_del) = $self->_find_value_offset({
- offset => $obj->{base_offset},
- trans_id => HEAD,
- allow_head => 1,
- });
- die "Attempt to use a deleted value" if $_is_del;
- die "Internal error!" if !$_val_offset;
-
- ##
- # Get our type from master index header
- ##
- my $tag = $self->load_tag($_val_offset);
- unless ( $tag ) {
- flock $fh, LOCK_UN;
- $self->_throw_error("Corrupted file, no master index record");
- }
-
- unless ($obj->_type eq $tag->{signature}) {
- flock $fh, LOCK_UN;
- $self->_throw_error("File type mismatch");
- }
- }
- }
- else {
- $self->calculate_sizes;
- }
-
- #XXX We have to make sure we don't mess up when autoflush isn't turned on
- $self->_storage->set_inode;
-
- flock $fh, LOCK_UN;
-
- return 1;
-}
-
-1;
-__END__
projects / dbsrgits/DBM-Deep.git / commitdiff