Log::Report::Dispatcher::File - send messages to a file or file-handle


   is a Log::Report::Dispatcher


 dispatcher Log::Report::Dispatcher::File => 'stderr'
   , to => \*STDERR, accept => 'NOTICE-';

 # close a dispatcher
 dispatcher close => 'stderr';

 # let dispatcher open and close the file
 dispatcher FILE => 'mylog', to => '/var/log/mylog'
   , charset => 'utf-8';
 dispatcher close => 'mylog';  # will close file

 # open yourself, then also close yourself
 open OUT, ">:encoding('iso-8859-1')", '/var/log/mylog'
     or fault "...";
 dispatcher FILE => 'mylog', to => \*OUT;
 dispatcher close => 'mylog';  
 close OUT;

 # dispatch into a scalar
 my $output = '';
 open $outfile, '>', \$output;
 dispatcher FILE => 'into-scalar', to => \$outfile;
 dispatcher close => 'into-scalar';
 print $output;


This basic file logger accepts an file-handle or filename as destination.

[1.00] writing to the file protected by a lock, so multiple processes can write to the same file.

Extends "DESCRIPTION" in Log::Report::Dispatcher.


Extends "METHODS" in Log::Report::Dispatcher.


Extends "Constructors" in Log::Report::Dispatcher.


Only when initiated with a FILENAME, the file will be closed. In any other case, nothing will be done.

Log::Report::Dispatcher::File->new($type, $name, %options)
 -Option       --Defined in             --Default
  accept         Log::Report::Dispatcher  depend on mode
  charset        Log::Report::Dispatcher  LOCALE
  format                                  <adds timestamp>
  format_reason  Log::Report::Dispatcher  'LOWERCASE'
  locale         Log::Report::Dispatcher  <system locale>
  mode           Log::Report::Dispatcher  'NORMAL'
  replace                                 false
  to                                      <required>
accept => REASONS
charset => CHARSET
format => CODE|'LONG'

[1.00] process each printed line. By default, this adds a timestamp, but you may want to add hostname, process number, or more.

   format => sub { '['.localtime().'] '.$_[0] }
   format => sub { shift }   # no timestamp
   format => 'LONG'

The first parameter to format is the string to print; it is already translated and trailed by a newline. The second parameter is the text-domain (if known).

[1.10] As third parameter, you get the $msg raw object as well (maybe you want to use the message context?) [1.19] After the three positional parameters, there may be a list of pairs providing additional facts about the exception. It may contain location information.

The "LONG" format is equivalent to:

  my $t = strftime "%FT%T", gmtime;
  "[$t $$] $_[1] $_[0]"

Use of context:

   format => sub { my ($msgstr, $domain, $msg, %more) = @_;
      my $host = $msg->context->{host};
      "$host $msgstr";
locale => LOCALE
mode => 'NORMAL'|'VERBOSE'|'ASSERT'|'DEBUG'|0..3
replace => BOOLEAN

Only used in combination with a FILENAME: throw away the old file if it exists. Probably you wish to append to existing information.

Use the LOCALE setting by default, which is LC_CTYPE or LC_ALL or LANG (in that order). If these contain a character-set which Perl understands, then that is used, otherwise silently ignored.


You can either specify a FILENAME, which is opened in append mode with autoflush on. Or pass any kind of FILE-HANDLE or some OBJECT which implements a print() method. You probably want to have autoflush enabled on your FILE-HANDLES.

When cleaning-up the dispatcher, the file will only be closed in case of a FILENAME.

[1.10] When you pass a CODE, then for each log message the function is called with two arguments: this dispatcher object and the message object. In some way (maybe via the message context) you have to determine the log filename. This means that probably many log-files are open at the same time.

   # configuration time
   dispatcher FILE => 'logfile', to =>
       sub { my ($disp, $msg) = @_; $msg->context->{logfile} };

   # whenever you want to change the logfile
   textdomain->updateContext(logfile => '/var/log/app');
   (textdomain 'mydomain')->setContext(logfile => '/var/log/app');

   # or
   error __x"help", _context => {logfile => '/dev/tty'};
   error __x"help", _context => "logfile=/dev/tty";


Extends "Accessors" in Log::Report::Dispatcher.


Returns the name of the opened file, or undef in case this dispatcher was started from a file-handle or file-object.


Inherited, see "Accessors" in Log::Report::Dispatcher


Inherited, see "Accessors" in Log::Report::Dispatcher


Inherited, see "Accessors" in Log::Report::Dispatcher

$obj->needs( [$reason] )

Inherited, see "Accessors" in Log::Report::Dispatcher


Returns the file-handle to write the log lines to. [1.10] This may depend on the $msg (especially message context)


Inherited, see "Accessors" in Log::Report::Dispatcher

File maintenance


[1.00] Move the current file to $filename, and start a new file.


Extends "Logging" in Log::Report::Dispatcher.


Inherited, see "Logging" in Log::Report::Dispatcher


Inherited, see "Logging" in Log::Report::Dispatcher

$obj->collectStack( [$maxdepth] )
Log::Report::Dispatcher::File->collectStack( [$maxdepth] )

Inherited, see "Logging" in Log::Report::Dispatcher

$obj->log(HASH-$of-%options, $reason, $message, $domain)

Inherited, see "Logging" in Log::Report::Dispatcher


Inherited, see "Logging" in Log::Report::Dispatcher


Inherited, see "Logging" in Log::Report::Dispatcher

$obj->translate(HASH-$of-%options, $reason, $message)

Inherited, see "Logging" in Log::Report::Dispatcher


Extends "DETAILS" in Log::Report::Dispatcher.


This module is part of Log-Report distribution version 1.34, built on September 15, 2022. Website:


Copyrights 2007-2022 by [Mark Overmeer <>]. 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