package VCP::DB; =head1 NAME VCP::DB - Persistant storage for id -> (name, rev_id) maps =head1 SYNOPSIS use base qw( VCP::DB ); =head1 DESCRIPTION By default, most VCP::Dest::* drivers keep track of the relationship between the id field assigned by the (original) VCP::Source::* driver and the final name and rev_id (or whatever fields are important to it) in the destination repository so that the previous_id fields, which refer to the original id, may be resolved when backfilling or branching. The VCP::*::revml drivers do not do this; they do not need to resolve id fields. The intent for this file is to serve as a base class so that individual sites may write their own ", ref $self, " plugins to, for instance, store this state in a RDBMS table. This is not quite offered at this time; we need to add an option to the appropriate VCP::Dest::* modules to allow the appropriate ", ref $self, " file to be loaded. To write your own ", ref $self, " file, see VCP::DB::sdbm. =for test_script t/01db_file.t =cut $VERSION = 1 ; use strict ; use Carp; use VCP::Debug qw( :debug ); use VCP::Utils qw( start_dir ); use fields ( 'Store', ## object used to store the database ); =head2 Methods =over =cut =item new VCP::DB::foo->new( StoreLoc => $dir, ## path to a dir to keep the state store in ); The C field indicates where the ", ref $self, " should be stored, for instance a DBI specification string or a directory to place a "revmap.db" file in. There is no control over the filename, as different storage modes may need different conventions. =cut sub new { my $class = shift ; $class = ref $class || $class ; my %options = @_; my $type = delete $options{Type} || "sdbm"; my $self = do { no strict 'refs' ; bless [ \%{"${class}::FIELDS"} ], $class; }; $self->{Store} ||= do { my $try_type = "VCP::DB_File::$type"; eval "require $try_type" ? $type = $try_type : ( eval "require $type;" || Carp::confess "Could not load VCP::DB_File subclass $type for $options{TableName}" ); $type->new( @_ ); }; return $self ; } =item store_loc Gets (does not set) the StoreLoc field as an absolute path. =cut sub store_loc { shift->{Store}->store_loc( @_ ) } =item delete_db $db->delete_db; Deletes the persitent store. This should remove all files, lock files, etc. for filesystem stores and drop any tables for RDBMS stores. Default action is to call close_db; subclasses should (subclasses should call C<$self->SUPER::delete_db before doing anything else in their delete_db() overrides). =cut sub delete_db { shift->{Store}->delete_db( @_ ) } =item open_db $db->open_db; Creates a new or opens an existing db. (subclasses should call C<$self->SUPER::open_db before doing anything else in their open_db() overrides). =cut sub open_db { shift->{Store}->open_db( @_ ) } =item open_existing_db $db->open_existing_db; Opens an existing db. (subclasses should call C<$self->SUPER::open_existing_db before doing anything else in their open_existing_db() overrides). =cut sub open_existing_db { shift->{Store}->open_existing_db( @_ ) } =item close_db $db->close_db; (subclasses should call C<$self->SUPER::close_db before doing anything else in their close_db() overrides). =cut sub close_db { shift->{Store}->close_db( @_ ) } =item set $db->set( $key, @values ); Sets the values for $key. =cut sub set { shift->{Store}->set( @_ ) } =item get my @values = $db->get( $key ); Gets the values for $key. =cut sub get { shift->{Store}->get( @_ ) } =item exists $db->exists( $key ); Tests that key exists =cut sub exists { shift->{Store}->exists( @_ ) } =back =head1 AUTHOR Barrie Slaymaker =head1 COPYRIGHT Copyright (c) 2000, 2001, 2002 Perforce Software, Inc. All rights reserved. See L (C) for the terms of use. =cut 1