Mail::SpamAssassin::BayesStore::BDB(3)

NAME
Mail::SpamAssassin::BayesStore::BDB - BerkeleyDB Bayesian Storage Module Implementation

SYNOPSIS

DESCRIPTION
This module implementes a BDB based bayesian storage module.

METHODS

  new
public class (Mail::SpamAssassin::BayesStore::SQL) new (Mail::Spamassassin::Plugin::Bayes $bayes)

Description: This methods creates a new instance of the Mail::SpamAssassin::BayesStore::BDB object. It expects to be passed an instance of the Mail::SpamAssassin:Bayes object which is passed into the Mail::SpamAssassin::BayesStore parent object.

  tie_db_readonly
public instance (Boolean) tie_db_readonly ();

Description: This method ensures that the database connection is properly setup and working.

  tie_db_writable
public instance (Boolean) tie_db_writable ()

Description: This method ensures that the database connection is properly setup and working. If necessary it will initialize the database so that they can begin using the database immediately.

  _open_db
private instance (Boolean) _open_db (Boolean $writable)

Description: This method ensures that the database connection is properly setup and working. It will initialize a users bayes variables so that they can begin using the database immediately.

  untie_db
public instance () untie_db ()

Description: Closes any open db handles. You can safely call this at any time.

  calculate_expire_delta
public instance (%) calculate_expire_delta (
  Integer $newest_atime, Integer $start, Integer $max_expire_mult)

Description: This method performs a calculation on the data to determine the optimum atime for token expiration.

  token_expiration
public instance (Integer, Integer,
                 Integer, Integer) token_expiration (\% $opts,
                        Integer $newdelta,
                        @ @vars)

Description: This method performs the database specific expiration of tokens based on the passed in $newdelta and @vars.

  sync_due
public instance (Boolean) sync_due ()

Description: This method determines if a database sync is currently required.

Unused for BDB implementation.

  seen_get
public instance (String) seen_get (string $msgid)

Description: This method retrieves the stored value, if any, for $msgid. The return value is the stored string ('s' for spam and 'h' for ham) or undef if $msgid is not found.

  seen_put
public (Boolean) seen_put (string $msgid, char $flag)

Description: This method records $msgid as the type given by $flag. $flag is one of two values 's' for spam and 'h' for ham.

  seen_delete
public instance (Boolean) seen_delete (string $msgid)

Description: This method removes $msgid from the database.

  get_storage_variables
public instance (@) get_storage_variables ()

Description: This method retrieves the various administrative variables used by the Bayes process and database.

The values returned in the array are in the following order:

0: scan count base

1: number of spam

2: number of ham

3: number of tokens in db

4: last expire atime

5: oldest token in db atime

6: db version value

7: last journal sync

8: last atime delta

9: last expire reduction count

10: newest token in db atime

  dump_tokens
public instance () dump_tokens (String $template, String $regex, Array @vars)

Description: This method loops over all tokens, computing the probability for the token and then printing it out according to the passed in token.

  set_last_expire
public instance (Boolean) set_last_expire (Integer $time)

Description: This method sets the last expire time.

  get_running_expire_tok
public instance (String $time) get_running_expire_tok ()

Description: This method determines if an expire is currently running and returns the last time set.

There can be multiple times, so we just pull the greatest (most recent) value.

  set_running_expire_tok
public instance (String $time) set_running_expire_tok ()

Description: This method sets the time that an expire starts running.

  remove_running_expire_tok
public instance (Boolean) remove_running_expire_tok ()

Description: This method removes the row in the database that indicates that and expire is currently running.

  tok_get
public instance (Integer, Integer, Integer) tok_get (String $token)

Description: This method retrieves a specificed token ($token) from the database and returns its spam_count, ham_count and last access time.

  tok_get_all
public instance (\@) tok_get (@ $tokens)

Description: This method retrieves the specified tokens ($tokens) from storage and returns an array ref of arrays spam count, ham acount and last access time.

  tok_count_change
public instance (Boolean) tok_count_change (
  Integer $dspam, Integer $dham, String $token, String $newatime)

Description: This method takes a $spam_count and $ham_count and adds it to $tok along with updating $toks atime with $atime.

  multi_tok_count_change
public instance (Boolean) multi_tok_count_change (
  Integer $dspam, Integer $dham, \% $tokens, String $newatime)

Description: This method takes a $dspam and $dham and adds it to all of the tokens in the $tokens hash ref along with updating each tokens atime with $atime.

  nspam_nham_get
public instance ($spam_count, $ham_count) nspam_nham_get ()

Description: This method retrieves the total number of spam and the total number of ham learned.

  nspam_nham_change
public instance (Boolean) nspam_nham_change (Integer $num_spam,
                        Integer $num_ham)

Description: This method updates the number of spam and the number of ham in the database.

  tok_touch
public instance (Boolean) tok_touch (String $token,
                        String $atime)

Description: This method updates the given tokens ($token) atime.

The assumption is that the token already exists in the database.

We will never update to an older atime

  tok_touch_all
public instance (Boolean) tok_touch (\@ $tokens
                        String $atime)

Description: This method does a mass update of the given list of tokens $tokens, if the existing token atime is < $atime.

The assumption is that the tokens already exist in the database.

We should never be touching more than N_SIGNIFICANT_TOKENS, so we can make some assumptions about how to handle the data (ie no need to batch like we do in tok_get_all)

  cleanup
public instance (Boolean) cleanup ()

Description: This method perfoms any cleanup necessary before moving onto the next operation.

  get_magic_re
public instance (String) get_magic_re ()

Description: This method returns a regexp which indicates a magic token.

Unused in BDB implementation.

  sync
public instance (Boolean) sync (\% $opts)

Description: This method performs a sync of the database

  perform_upgrade
public instance (Boolean) perform_upgrade (\% $opts);

Description: Performs an upgrade of the database from one version to another, not currently used in this implementation.

  clear_database
public instance (Boolean) clear_database ()

Description: This method deletes all records for a particular user.

Callers should be aware that any errors returned by this method could causes the database to be inconsistent for the given user.

  backup_database
public instance (Boolean) backup_database ()

Description: This method will dump the users database in a machine readable format.

  restore_database
public instance (Boolean) restore_database (String $filename, Boolean $showdots)

Description: This method restores a database from the given filename, $filename.

Callers should be aware that any errors returned by this method could causes the database to be inconsistent for the given user.

  db_readable
public instance (Boolean) db_readable()

Description: This method returns a boolean value indicating if the database is in a readable state.

  db_writable
public instance (Boolean) db_writable()

Description: This method returns a boolean value indicating if the database is in a writable state.

  _extract_atime
private instance () _extract_atime (String $token,
                        String $value,
                        String $index)

Description: This method ensures that the database connection is properly setup and working. If appropriate it will initialize a users bayes variables so that they can begin using the database immediately.

  _put_token
FIXME: This is rarely a good interface, because of the churn that will often happen in the "magic" tokens. Open-code this stuff in the presence of loops.