Bio::DB::FileCache - In file cache for BioSeq objects $cachedb = Bio::DB::FileCache->new($real_db); # # $real_db is a Bio::DB::RandomAccessI database # $seq = $cachedb->get_Seq_by_id('ROA1_HUMAN'); # # $seq is a Bio::Seq object # # more control provided with named-parameter form $cachedb = Bio::DB::FileCache->new( -seqdb => $real_db, -file => $path, -keep => $flag, ); =head1 DESCRIPTION This is a disk cache system which saves the objects returned by Bio::DB::RandomAccessI on disk. The disk cache grows without limit, while the process is running, but is automatically unlinked at process termination unless the -keep flag is set. This module requires DB_File and Storable. Lincoln Stein

Reporting Bugs
Report bugs to the Bioperl bug tracking system to help us keep track the bugs and their resolution. Bug reports can be submitted via email or the web: bioperl-bugs@bio.perl.org http://bugzilla.bioperl.org/ The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _

new
Title : new Usage : $db = Bio::DB::FileCache->new( -seqdb => $db, # Bio::DB::RandomAccessI database -file => $path, # path to index file -keep => $flag, # don't unlink index file ) Function: creates a new on-disk cache Returns : a Bio::DB::RandomAccessI database Args : as above Throws : "Must be a randomaccess database" exception "Could not open primary index file" exception If no index file is specified, will create a temporary file in your system's temporary file directory. The name of this temporary file can be retrieved using file_name().

get_Seq_by_id
Title : get_Seq_by_id Usage : $seq = $db->get_Seq_by_id('ROA1_HUMAN') Function: Gets a Bio::Seq object by its name Returns : a Bio::Seq object Args : the id (as a string) of a sequence Throws : "id does not exist" exception

get_Seq_by_acc
Title : get_Seq_by_acc Usage : $seq = $db->get_Seq_by_acc('X77802'); Function: Gets a Bio::Seq object by accession number Returns : A Bio::Seq object Args : accession number (as a string) Throws : "acc does not exist" exception

seqdb
Title : seqdb Usage : $seqdb = $db->seqdb([$seqdb]) Function: gets/sets the Bio::DB::RandomAccessI database Returns : a Bio::DB::RandomAccessI database Args : new sequence database (optional) Throws : nothing

file_name
Title : file_name Usage : $path = $db->file_name([$file_name]) Function: gets/sets the name of the cache file Returns : a path Args : new cache file name (optional) Throws : nothing It probably isn't useful to set the cache file name after you've opened it.

keep
Title : keep Usage : $keep = $db->keep([$flag]) Function: gets/sets the value of the "keep" flag Returns : current value Args : new value (optional) Throws : nothing The keep flag will cause the index file to be unlinked when the process exits. Since on some operating systems (Unix, OS/2) the unlinking occurs during the new() call immediately after opening the file, it probably isn't safe to change this value.

db
Title : db Usage : $db->db Function: returns tied hash to index database Returns : a Berkeley DB tied hashref Args : none Throws : nothing

flush
Title : flush Usage : $db->flush Function: flushes the cache Returns : nothing Args : none Throws : nothing

get_Seq_by_version
Title : get_Seq_by_version Usage : $seq = $db->get_Seq_by_version('X77802.1'); Function: Gets a Bio::Seq object by sequence version Returns : A Bio::Seq object Args : accession.version (as a string) Throws : "acc.version does not exist" exception