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Mail::Reporter(3pm)            User Contributed Perl Documentation            Mail::Reporter(3pm)

NAME
       Mail::Reporter - base-class and error reporter for Mail::Box

INHERITANCE
        Mail::Reporter is extended by
          Mail::Box
          Mail::Box::Collection
          Mail::Box::Identity
          Mail::Box::Locker
          Mail::Box::MH::Index
          Mail::Box::MH::Labels
          Mail::Box::Manager
          Mail::Box::Parser
          Mail::Box::Search
          Mail::Box::Thread::Manager
          Mail::Box::Thread::Node
          Mail::Message
          Mail::Message::Body
          Mail::Message::Body::Delayed
          Mail::Message::Convert
          Mail::Message::Field
          Mail::Message::Field::Attribute
          Mail::Message::Head
          Mail::Message::Head::FieldGroup
          Mail::Message::TransferEnc
          Mail::Server
          Mail::Transport

SYNOPSIS
        $folder->log(WARNING => 'go away');
        print $folder->trace;        # current level
        $folder->trace('PROGRESS');  # set level
        print $folder->errors;
        print $folder->report('PROGRESS');

DESCRIPTION
       The "Mail::Reporter" class is the base class for all classes, except
       Mail::Message::Field::Fast because it would become slow...  This base class is used during
       initiation of the objects, and for configuring and logging error messages.

METHODS
       The "Mail::Reporter" class is the base for nearly all other objects.  It can store and
       report problems, and contains the general constructor new().

   Constructors
       Mail::Reporter->new(%options)
           This error container is also the base constructor for all modules, (as long as there
           is no need for another base object)  The constructor always accepts the following
           %options related to error reports.

            -Option--Default
             log     'WARNINGS'
             trace   'WARNINGS'

           log => LEVEL
             Log messages which have a priority higher or equal to the specified level are stored
             internally and can be retrieved later.  The global default for this option can be
             changed with defaultTrace().

             Known levels are "INTERNAL", "ERRORS", "WARNINGS", "PROGRESS", "NOTICES" "DEBUG",
             and "NONE".  The "PROGRESS" level relates to the reading and writing of folders.
             "NONE" will cause only "INTERNAL" errors to be logged.  By the way: "ERROR" is an
             alias for "ERRORS", as "WARNING" is an alias for "WARNINGS", and "NOTICE" for
             "NOTICES".

           trace => LEVEL
             Trace messages which have a level higher or equal to the specified level are
             directly printed using warn.  The global default for this option can be changed with
             defaultTrace().

   Error handling
       $obj->AUTOLOAD()
           By default, produce a nice warning if the sub-classes cannot resolve a method.

       $obj->addReport($object)
           Add the report from other $object to the report of this object. This is useful when
           complex actions use temporary objects which are not returned to the main application
           but where the main application would like to know about any problems.

       $obj->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )
       Mail::Reporter->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )
           Reports the default log and trace level which is used for object as list of two
           elements.  When not explicitly set, both are set to "WARNINGS".

           This method has three different uses. When one argument is specified, that $level is
           set for both loglevel as tracelevel.

           With two arguments, the second determines which configuration you like.  If the second
           argument is a CODE reference, you install a $callback.  The loglevel will be set to
           NONE, and all warnings produced in your program will get passed to the $callback
           function.  That function will get the problem level, the object or class which reports
           the problem, and the problem text passed as arguments.

           In any case two values are returned: the first is the log level, the second represents
           the trace level.  Both are special variables: in numeric context they deliver a value
           (the internally used value), and in string context the string name.  Be warned that
           the string is always in singular form!

           example: setting loglevels

            my ($loglevel, $tracelevel) = Mail::Reporter->defaultTrace;
            Mail::Reporter->defaultTrace('NOTICES');

            my ($l, $t) = Mail::Reporter->defaultTrace('WARNINGS', 'DEBUG');
            print $l;     # prints "WARNING"  (no S!)
            print $l+0;   # prints "4"
            print "Auch" if $l >= $self->logPriority('ERROR');

            Mail::Reporter->defaultTrace('NONE');  # silence all reports

            $folder->defaultTrace('DEBUG');   # Still set as global default!
            $folder->trace('DEBUG');          # local default

           example: installing a callback

            Mail::Reporter->defaultTrace

       $obj->errors()
           Equivalent to

            $folder->report('ERRORS')

       $obj->log( [$level, [$strings]] )
       Mail::Reporter->log( [$level, [$strings]] )
           As instance method, this function has three different purposes.  Without any argument,
           it returns one scalar containing the number which is internally used to represent the
           current log level, and the textual representation of the string at the same time. See
           Scalar::Util method "dualvar" for an explanation.

           With one argument, a new level of logging detail is set (specify a number of one of
           the predefined strings).  With more arguments, it is a report which may need to be
           logged or traced.

           As class method, only a message can be passed.  The global configuration value set
           with defaultTrace() is used to decide whether the message is shown or ignored.

           Each log-entry has a $level and a text string which will be constructed by joining the
           $strings.  If there is no newline, it will be added.

           example:

            print $message->log;      # may print "NOTICE"
            print $message->log +0;   # may print "3"
            $message->log('ERRORS');  # sets a new level, returns the numeric value

            $message->log(WARNING => "This message is too large.");
            $folder ->log(NOTICE  => "Cannot read from file $filename.");
            $manager->log(DEBUG   => "Hi there!", reverse sort @l);

            Mail::Message->log(ERROR => 'Unknown');

       $obj->logPriority($level)
       Mail::Reporter->logPriority($level)
           One error level (log or trace) has more than one representation: a numeric value and
           one or more strings.  For instance, 4, 'WARNING', and 'WARNINGS' are all the same.
           You can specify any of these, and in return you get a dualvar (see Scalar::Util method
           "dualvar") back, which contains the number and the singular form.

           The higher the number, the more important the message.  Only messages about "INTERNAL"
           problems are more important than "NONE".

           example:

            my $r = Mail::Reporter->logPriority('WARNINGS');
            my $r = Mail::Reporter->logPriority('WARNING');    # same
            my $r = Mail::Reporter->logPriority(4);            # same, deprecated
            print $r;      # prints 'WARNING'  (no S!)
            print $r + 0;  # prints 4
            if($r < Mail::Reporter->logPriority('ERROR')) {..} # true

       $obj->logSettings()
           Returns a list of "(key =" value)> pairs which can be used to initiate a new object
           with the same log-settings as this one.

           example:

            $head->new($folder->logSettings);

       $obj->notImplemented()
           A special case of log(), which logs a "INTERNAL"-error and then croaks.  This is used
           by extension writers.

       $obj->report( [$level] )
           Get logged reports, as list of strings.  If a $level is specified, the log for that
           level is returned.

           In case no $level is specified, you get all messages each as reference to a tuple with
           level and message.

           example:

            my @warns = $message->report('WARNINGS');
              # previous indirectly callable with
              my @warns = $msg->warnings;

            print $folder->report('ERRORS');

            if($folder->report('DEBUG')) {...}

            my @reports = $folder->report;
            foreach (@reports) {
               my ($level, $text) = @$_;
               print "$level report: $text";
            }

       $obj->reportAll( [$level] )
           Report all messages which were produced by this object and all the objects which are
           maintained by this object.  This will return a list of triplets, each containing a
           reference to the object which caught the report, the level of the report, and the
           message.

           example:

            my $folder = Mail::Box::Manager->new->open(folder => 'inbox');
            my @reports = $folder->reportAll;
            foreach (@reports) {
               my ($object, $level, $text) = @$_;

               if($object->isa('Mail::Box')) {
                  print "Folder $object: $level: $message";
               } elsif($object->isa('Mail::Message') {
                  print "Message ".$object->seqnr.": $level: $message";
               }
            }

       $obj->trace( [$level] )
           Change the trace $level of the object. When no arguments are specified, the current
           level is returned only.  It will be returned in one scalar which contains both the
           number which is internally used to represent the level, and the string which
           represents it.  See logPriority().

       $obj->warnings()
           Equivalent to

            $folder->report('WARNINGS')

   Cleanup
       $obj->DESTROY()
           Cleanup the object.

DIAGNOSTICS
       Error: Package $package does not implement $method.
           Fatal error: the specific package (or one of its superclasses) does not implement this
           method where it should. This message means that some other related classes do
           implement this method however the class at hand does not.  Probably you should
           investigate this and probably inform the author of the package.

SEE ALSO
       This module is part of Mail-Message distribution version 3.012, built on February 11,
       2022. Website: http://perl.overmeer.net/CPAN/

LICENSE
       Copyrights 2001-2022 by [Mark Overmeer <markov AT cpan.org>]. For other contributors see
       ChangeLog.

       This program is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.  See http://dev.perl.org/licenses/

perl v5.34.0                                2022-02-14                        Mail::Reporter(3pm)

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