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Try.pm	2.89 KB	-rw-rw-rw-	2021-01-15 17:36
Try.pod	9.68 KB	-rw-rw-rw-	2021-01-15 17:36

Rename

=encoding utf8

=head1 NAME

Log::Report::Dispatcher::Try - capture all reports as exceptions

=head1 INHERITANCE

Log::Report::Dispatcher::Try
   is a Log::Report::Dispatcher

=head1 SYNOPSIS

try { ... };       # mind the ';' !!
 if($@) {           # signals something went wrong

if(try {...}) {    # block ended normally

my $x = try { read_temperature() };
 my @x = try { read_lines_from_file() };

try { ... }        # no comma!!
    mode => 'DEBUG', accept => 'ERROR-';

try sub { ... },   # with comma
    mode => 'DEBUG', accept => 'ALL';

try \&myhandler, accept => 'ERROR-';
 try { ... } hide => 'TRACE';

print ref $@;      # Log::Report::Dispatcher::Try

$@->reportFatal;   # re-dispatch result of try block
 $@->reportAll;     # ... also warnings etc
 if($@) {...}       # if errors
 if($@->failed) {   # same       # }
 if($@->success) {  # no errors  # }

try { # something causes an error report, which is caught
       failure 'no network';
     };
 $@->reportFatal(to => 'syslog');  # overrule destination

print $@->exceptions; # no re-cast, just print

=head1 DESCRIPTION

The B<try> works like Perl's build-in C<eval()>, but implements
real exception handling which Perl core lacks.

The L<Log::Report::try()|Log::Report/"Report Production and Configuration"> function creates this C<::Try> dispatcher
object with name 'try'.  After the C<try()> is over, you can find
the object in C<$@>.  The C<$@> as C<::Try> object behaves exactly
as the C<$@> produced by C<eval>, but has many added features.

The C<try()> function catches fatal errors happening inside the BLOCK
(CODE reference which is just following the function name) into the
C<::Try> object C<$@>.  The errors are not automatically progressed to
active dispatchers.  However, non-fatal exceptions (like info or notice)
are also collected (unless not accepted, see L<new(accept)|Log::Report::Dispatcher/"Constructors">, but also
immediately passed to the active dispatchers (unless the reason is hidden,
see L<new(hide)|Log::Report::Dispatcher::Try/"Constructors">)

After the C<try()> has run, you can introspect the collected exceptions.
Typically, you use L<wasFatal()|Log::Report::Dispatcher::Try/"Status"> to get the exception which terminated
the run of the BLOCK.

Extends L<"DESCRIPTION" in Log::Report::Dispatcher|Log::Report::Dispatcher/"DESCRIPTION">.
 
=head1 METHODS

Extends L<"METHODS" in Log::Report::Dispatcher|Log::Report::Dispatcher/"METHODS">.
 
=head2 Constructors

Extends L<"Constructors" in Log::Report::Dispatcher|Log::Report::Dispatcher/"Constructors">.
 
=over 4

=item $obj-E<gt>B<close>()

Inherited, see L<Log::Report::Dispatcher/"Constructors">

=item Log::Report::Dispatcher::Try-E<gt>B<new>($type, $name, %options)

-Option       --Defined in             --Default
  accept         Log::Report::Dispatcher  depend on mode
  charset        Log::Report::Dispatcher  <undef>
  died                                    undef
  exceptions                              []
  format_reason  Log::Report::Dispatcher  'LOWERCASE'
  hide                                    'NONE'
  locale         Log::Report::Dispatcher  <system locale>
  mode           Log::Report::Dispatcher  'NORMAL'
  on_die                                  'ERROR'

=over 2

=item accept => REASONS

=item charset => CHARSET

=item died => STRING

The exit string ($@) of the eval'ed block.

=item exceptions => ARRAY

ARRAY of L<Log::Report::Exception|Log::Report::Exception> objects.

=item format_reason => 'UPPERCASE'|'LOWERCASE'|'UCFIRST'|'IGNORE'|CODE

=item hide => REASONS|ARRAY|'ALL'|'NONE'

[1.09] see L<hide()|Log::Report::Dispatcher::Try/"Accessors">

=item locale => LOCALE

=item mode => 'NORMAL'|'VERBOSE'|'ASSERT'|'DEBUG'|0..3

=item on_die => 'ERROR'|'PANIC'

When code which runs in this block exits with a die(), it will get
translated into a L<Log::Report::Exception|Log::Report::Exception> using
L<Log::Report::Die::die_decode()|Log::Report::Die/"FUNCTIONS">.  How serious are we about these
errors?

=back

=head2 Accessors

Extends L<"Accessors" in Log::Report::Dispatcher|Log::Report::Dispatcher/"Accessors">.
 
=over 4

=item $obj-E<gt>B<die2reason>()

Returns the value of L<new(on_die)|Log::Report::Dispatcher::Try/"Constructors">.

=item $obj-E<gt>B<died>( [STRING] )

The message which was reported by C<eval>, which is used internally
to catch problems in the try block.

=item $obj-E<gt>B<exceptions>()

Returns all collected C<Log::Report::Exceptions>.  The last of
them may be a fatal one.  The other are non-fatal.

=item $obj-E<gt>B<hide>(@reasons)

[1.09] By default, the try will only catch messages which stop the
execution of the block (errors etc, internally a 'die').  Other messages
are passed to the parent dispatchers.

This option gives the opportunity to stop, for instance, trace messages.
Those messages are still collected inside the try object (unless excluded
by L<new(accept)|Log::Report::Dispatcher/"Constructors">), so may get passed-on later via L<reportAll()|Log::Report::Dispatcher::Try/"Logging"> if
you like.

Be warned: Using this method will reset the whole 'hide' configuration:
it's a I<set> not an I<add>.

example: change the setting of the running block

my $parent_try = dispatcher 'active-try';
  $parent_try->hide('ALL');

=item $obj-E<gt>B<hides>($reason)

Check whether the try stops message which were produced for C<$reason>.

=item $obj-E<gt>B<isDisabled>()

Inherited, see L<Log::Report::Dispatcher/"Accessors">

=item $obj-E<gt>B<mode>()

Inherited, see L<Log::Report::Dispatcher/"Accessors">

=item $obj-E<gt>B<name>()

Inherited, see L<Log::Report::Dispatcher/"Accessors">

=item $obj-E<gt>B<needs>( [$reason] )

Inherited, see L<Log::Report::Dispatcher/"Accessors">

=item $obj-E<gt>B<type>()

Inherited, see L<Log::Report::Dispatcher/"Accessors">

=back

=head2 Logging

Extends L<"Logging" in Log::Report::Dispatcher|Log::Report::Dispatcher/"Logging">.
 
=over 4

=item $obj-E<gt>B<addSkipStack>(@CODE)

=item Log::Report::Dispatcher::Try-E<gt>B<addSkipStack>(@CODE)

Inherited, see L<Log::Report::Dispatcher/"Logging">

=item $obj-E<gt>B<collectLocation>()

=item Log::Report::Dispatcher::Try-E<gt>B<collectLocation>()

Inherited, see L<Log::Report::Dispatcher/"Logging">

=item $obj-E<gt>B<collectStack>( [$maxdepth] )

=item Log::Report::Dispatcher::Try-E<gt>B<collectStack>( [$maxdepth] )

Inherited, see L<Log::Report::Dispatcher/"Logging">

=item $obj-E<gt>B<log>($opts, $reason, $message)

Other dispatchers translate the message here, and make it leave the
program.  However, messages in a "try" block are only captured in
an intermediate layer: they may never be presented to an end-users.
And for sure, we do not know the language yet.

The $message is either a STRING or a L<Log::Report::Message|Log::Report::Message>.

=item $obj-E<gt>B<reportAll>(%options)

Re-cast the messages in all collect exceptions into the defined
dispatchers, which were disabled during the try block. The %options
will end-up as HASH of %options to L<Log::Report::report()|Log::Report/"Report Production and Configuration">; see
L<Log::Report::Exception::throw()|Log::Report::Exception/"Processing"> which does the job.

=item $obj-E<gt>B<reportFatal>()

Re-cast only the fatal message to the defined dispatchers.  If the
block was left without problems, then nothing will be done.  The %options
will end-up as HASH of %options to L<Log::Report::report()|Log::Report/"Report Production and Configuration">; see
L<Log::Report::Exception::throw()|Log::Report::Exception/"Processing"> which does the job.

=item $obj-E<gt>B<skipStack>()

Inherited, see L<Log::Report::Dispatcher/"Logging">

=item $obj-E<gt>B<stackTraceLine>(%options)

=item Log::Report::Dispatcher::Try-E<gt>B<stackTraceLine>(%options)

Inherited, see L<Log::Report::Dispatcher/"Logging">

=item $obj-E<gt>B<translate>(HASH-$of-%options, $reason, $message)

Inherited, see L<Log::Report::Dispatcher/"Logging">

=back

=head2 Status

=over 4

=item $obj-E<gt>B<failed>()

Returns true if the block was left with an fatal message.

=item $obj-E<gt>B<showStatus>()

If this object is kept in C<$@>, and someone uses this as string, we
want to show the fatal error message.

The message is not very informative for the good cause: we do not want
people to simply print the C<$@>, but wish for a re-cast of the message
using L<reportAll()|Log::Report::Dispatcher::Try/"Logging"> or L<reportFatal()|Log::Report::Dispatcher::Try/"Logging">.

=item $obj-E<gt>B<success>()

Returns true if the block exited normally.

=item $obj-E<gt>B<wasFatal>(%options)

Returns the L<Log::Report::Exception|Log::Report::Exception> which caused the "try" block to
die, otherwise an empty LIST (undef).

-Option--Default
  class   undef

=over 2

=item class => CLASS|REGEX

Only return the exception if it was fatal, and in the same time in
the specified CLASS (as string) or matches the REGEX.
See L<Log::Report::Message::inClass()|Log::Report::Message/"Processing">

=back

=head1 DETAILS

Extends L<"DETAILS" in Log::Report::Dispatcher|Log::Report::Dispatcher/"DETAILS">.
 
=head1 OVERLOADING

=over 4

=item overload: B<boolean>

Returns true if the previous try block did produce a terminal
error.  This "try" object is assigned to C<$@>, and the usual
perl syntax is C<if($@) {...error-handler...}>.

=item overload: B<stringify>

When C<$@> is used the traditional way, it is checked to have
a string content.  In this case, stringify into the fatal error
or nothing.

=back

=head1 SEE ALSO

This module is part of Log-Report distribution version 1.31,
built on January 15, 2021. Website: F<http://perl.overmeer.net/CPAN/>

=head1 LICENSE

Copyrights 2007-2021 by [Mark Overmeer <markov@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 F<http://dev.perl.org/licenses/>