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.IX Title "Mail::SpamAssassin::BayesStore::BDB 3"
.TH Mail::SpamAssassin::BayesStore::BDB 3 "2015-04-29" "perl v5.16.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
Mail::SpamAssassin::BayesStore::BDB \- BerkeleyDB Bayesian Storage Module Implementation
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module implementes a \s-1BDB\s0 based bayesian storage module.
.SH "METHODS"
.IX Header "METHODS"
.SS "new"
.IX Subsection "new"
public class (Mail::SpamAssassin::BayesStore::SQL) new (Mail::Spamassassin::Plugin::Bayes \f(CW$bayes\fR)
.PP
Description:
This methods creates a new instance of the Mail::SpamAssassin::BayesStore::BDB
object.  It expects to be passed an instance of the Mail::SpamAssassin:Bayes
object which is passed into the Mail::SpamAssassin::BayesStore parent object.
.SS "tie_db_readonly"
.IX Subsection "tie_db_readonly"
public instance (Boolean) tie_db_readonly ();
.PP
Description:
This method ensures that the database connection is properly setup and
working.
.SS "tie_db_writable"
.IX Subsection "tie_db_writable"
public instance (Boolean) tie_db_writable ()
.PP
Description:
This method ensures that the database connection is properly setup and
working. If necessary it will initialize the database so that they can
begin using the database immediately.
.SS "_open_db"
.IX Subsection "_open_db"
private instance (Boolean) _open_db (Boolean \f(CW$writable\fR)
.PP
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.
.SS "untie_db"
.IX Subsection "untie_db"
public instance () untie_db ()
.PP
Description:
Closes any open db handles.  You can safely call this at any time.
.SS "calculate_expire_delta"
.IX Subsection "calculate_expire_delta"
public instance (%) calculate_expire_delta (
  Integer \f(CW$newest_atime\fR, Integer \f(CW$start\fR, Integer \f(CW$max_expire_mult\fR)
.PP
Description:
This method performs a calculation on the data to determine the
optimum atime for token expiration.
.SS "token_expiration"
.IX Subsection "token_expiration"
public instance (Integer, Integer,
                 Integer, Integer) token_expiration (\e% \f(CW$opts\fR,
                                                     Integer \f(CW$newdelta\fR,
                                                     @ \f(CW@vars\fR)
.PP
Description:
This method performs the database specific expiration of tokens based on
the passed in \f(CW$newdelta\fR and \f(CW@vars\fR.
.SS "sync_due"
.IX Subsection "sync_due"
public instance (Boolean) sync_due ()
.PP
Description:
This method determines if a database sync is currently required.
.PP
Unused for \s-1BDB\s0 implementation.
.SS "seen_get"
.IX Subsection "seen_get"
public instance (String) seen_get (string \f(CW$msgid\fR)
.PP
Description:
This method retrieves the stored value, if any, for \f(CW$msgid\fR.  The return
value is the stored string ('s' for spam and 'h' for ham) or undef if \f(CW$msgid\fR
is not found.
.SS "seen_put"
.IX Subsection "seen_put"
public (Boolean) seen_put (string \f(CW$msgid\fR, char \f(CW$flag\fR)
.PP
Description:
This method records \f(CW$msgid\fR as the type given by \f(CW$flag\fR.  \f(CW$flag\fR is one
of two values 's' for spam and 'h' for ham.
.SS "seen_delete"
.IX Subsection "seen_delete"
public instance (Boolean) seen_delete (string \f(CW$msgid\fR)
.PP
Description:
This method removes \f(CW$msgid\fR from the database.
.SS "get_storage_variables"
.IX Subsection "get_storage_variables"
public instance (@) get_storage_variables ()
.PP
Description:
This method retrieves the various administrative variables used by
the Bayes process and database.
.PP
The values returned in the array are in the following order:
.PP
0: scan count base
.PP
1: number of spam
.PP
2: number of ham
.PP
3: number of tokens in db
.PP
4: last expire atime
.PP
5: oldest token in db atime
.PP
6: db version value
.PP
7: last journal sync
.PP
8: last atime delta
.PP
9: last expire reduction count
.PP
10: newest token in db atime
.SS "dump_tokens"
.IX Subsection "dump_tokens"
public instance () dump_tokens (String \f(CW$template\fR, String \f(CW$regex\fR, Array \f(CW@vars\fR)
.PP
Description:
This method loops over all tokens, computing the probability for the token
and then printing it out according to the passed in token.
.SS "set_last_expire"
.IX Subsection "set_last_expire"
public instance (Boolean) set_last_expire (Integer \f(CW$time\fR)
.PP
Description:
This method sets the last expire time.
.SS "get_running_expire_tok"
.IX Subsection "get_running_expire_tok"
public instance (String \f(CW$time\fR) get_running_expire_tok ()
.PP
Description:
This method determines if an expire is currently running and returns
the last time set.
.PP
There can be multiple times, so we just pull the greatest (most recent)
value.
.SS "set_running_expire_tok"
.IX Subsection "set_running_expire_tok"
public instance (String \f(CW$time\fR) set_running_expire_tok ()
.PP
Description:
This method sets the time that an expire starts running.
.SS "remove_running_expire_tok"
.IX Subsection "remove_running_expire_tok"
public instance (Boolean) remove_running_expire_tok ()
.PP
Description:
This method removes the row in the database that indicates that
and expire is currently running.
.SS "tok_get"
.IX Subsection "tok_get"
public instance (Integer, Integer, Integer) tok_get (String \f(CW$token\fR)
.PP
Description:
This method retrieves a specificed token (\f(CW$token\fR) from the database
and returns its spam_count, ham_count and last access time.
.SS "tok_get_all"
.IX Subsection "tok_get_all"
public instance (\e@) tok_get (@ \f(CW$tokens\fR)
.PP
Description:
This method retrieves the specified tokens (\f(CW$tokens\fR) from storage and
returns an array ref of arrays spam count, ham acount and last access time.
.SS "tok_count_change"
.IX Subsection "tok_count_change"
public instance (Boolean) tok_count_change (
  Integer \f(CW$dspam\fR, Integer \f(CW$dham\fR, String \f(CW$token\fR, String \f(CW$newatime\fR)
.PP
Description:
This method takes a \f(CW$spam_count\fR and \f(CW$ham_count\fR and adds it to
\&\f(CW$tok\fR along with updating \f(CW$tok\fRs atime with \f(CW$atime\fR.
.SS "multi_tok_count_change"
.IX Subsection "multi_tok_count_change"
public instance (Boolean) multi_tok_count_change (
  Integer \f(CW$dspam\fR, Integer \f(CW$dham\fR, \e% \f(CW$tokens\fR, String \f(CW$newatime\fR)
.PP
Description:
This method takes a \f(CW$dspam\fR and \f(CW$dham\fR and adds it to all of the
tokens in the \f(CW$tokens\fR hash ref along with updating each tokens
atime with \f(CW$atime\fR.
.SS "nspam_nham_get"
.IX Subsection "nspam_nham_get"
public instance ($spam_count, \f(CW$ham_count\fR) nspam_nham_get ()
.PP
Description:
This method retrieves the total number of spam and the total number of
ham learned.
.SS "nspam_nham_change"
.IX Subsection "nspam_nham_change"
public instance (Boolean) nspam_nham_change (Integer \f(CW$num_spam\fR,
                                             Integer \f(CW$num_ham\fR)
.PP
Description:
This method updates the number of spam and the number of ham in the database.
.SS "tok_touch"
.IX Subsection "tok_touch"
public instance (Boolean) tok_touch (String \f(CW$token\fR,
                                     String \f(CW$atime\fR)
.PP
Description:
This method updates the given tokens (\f(CW$token\fR) atime.
.PP
The assumption is that the token already exists in the database.
.PP
We will never update to an older atime
.SS "tok_touch_all"
.IX Subsection "tok_touch_all"
public instance (Boolean) tok_touch (\e@ \f(CW$tokens\fR
                                     String \f(CW$atime\fR)
.PP
Description:
This method does a mass update of the given list of tokens \f(CW$tokens\fR,
if the existing token atime is < \f(CW$atime\fR.
.PP
The assumption is that the tokens already exist in the database.
.PP
We should never be touching more than N_SIGNIFICANT_TOKENS, so we can
make some assumptions about how to handle the data (ie no need to
batch like we do in tok_get_all)
.SS "cleanup"
.IX Subsection "cleanup"
public instance (Boolean) cleanup ()
.PP
Description:
This method perfoms any cleanup necessary before moving onto the next
operation.
.SS "get_magic_re"
.IX Subsection "get_magic_re"
public instance (String) get_magic_re ()
.PP
Description:
This method returns a regexp which indicates a magic token.
.PP
Unused in \s-1BDB\s0 implementation.
.SS "sync"
.IX Subsection "sync"
public instance (Boolean) sync (\e% \f(CW$opts\fR)
.PP
Description:
This method performs a sync of the database
.SS "perform_upgrade"
.IX Subsection "perform_upgrade"
public instance (Boolean) perform_upgrade (\e% \f(CW$opts\fR);
.PP
Description:
Performs an upgrade of the database from one version to another, not
currently used in this implementation.
.SS "clear_database"
.IX Subsection "clear_database"
public instance (Boolean) clear_database ()
.PP
Description:
This method deletes all records for a particular user.
.PP
Callers should be aware that any errors returned by this method
could causes the database to be inconsistent for the given user.
.SS "backup_database"
.IX Subsection "backup_database"
public instance (Boolean) backup_database ()
.PP
Description:
This method will dump the users database in a machine readable format.
.SS "restore_database"
.IX Subsection "restore_database"
public instance (Boolean) restore_database (String \f(CW$filename\fR, Boolean \f(CW$showdots\fR)
.PP
Description:
This method restores a database from the given filename, \f(CW$filename\fR.
.PP
Callers should be aware that any errors returned by this method
could causes the database to be inconsistent for the given user.
.SS "db_readable"
.IX Subsection "db_readable"
public instance (Boolean) \fIdb_readable()\fR
.PP
Description:
This method returns a boolean value indicating if the database is in a
readable state.
.SS "db_writable"
.IX Subsection "db_writable"
public instance (Boolean) \fIdb_writable()\fR
.PP
Description:
This method returns a boolean value indicating if the database is in a
writable state.
.SS "_extract_atime"
.IX Subsection "_extract_atime"
private instance () _extract_atime (String \f(CW$token\fR,
                                    String \f(CW$value\fR,
                                    String \f(CW$index\fR)
.PP
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.
.SS "_put_token"
.IX Subsection "_put_token"
\&\s-1FIXME:\s0 This is rarely a good interface, because of the churn that will
often happen in the \*(L"magic\*(R" tokens.  Open-code this stuff in the
presence of loops.