DOKK / manpages / debian 12 / libanyevent-forkobject-perl / AnyEvent::ForkObject.3pm.en
AnyEvent::ForkObject(3pm) User Contributed Perl Documentation AnyEvent::ForkObject(3pm)

AnyEvent::ForkObject - Async access on objects.

    use AnyEvent::ForkObject;
    use DBI;
    my $fo = new AnyEvent::ForkObject;
    $fo->do(
        module => 'DBI',
        method => 'connect',
        args => [ 'dbi:mysql...' ],
        cb => sub {
            my ($status, $dbh) = @_;
            $dbh->selectrow_array('SELECT ?', undef, 1 + 1, sub {
                my ($status, $result) = @_;
                print "$result\n";   # prints 2
            });
        }
    );
    use AnyEvent::Tools qw(async_repeat);
    $dbh->prepare('SELECT * FROM tbl', sub {
        my ($status, $sth) = @_;
        $sth->execute(sub {
            my ($status, $rv) = @_;
            # fetch 30 rows
            async_repeat 30 => sub {
                my ($guard) = @_;
                $sth->fetchrow_hashref(sub {
                    my ($status, $row) = @_;
                    undef $guard;
                    # do something with $row
                });
            };
        });
    });

There are a lot of modules that provide object interface. Using the module You can use them in async mode.

Constructor. Creates an instance that contains fork jail.

Creates an object inside jail. It receives the following named arguments:

Do require inside jail. If the argument is exists, module, method and wantarray arguments will be ignored.
Module name. For example 'DBI'.
Constructor name. Default value is 'new'.
Context for method. Default is 0 (SCALAR).
Done callback. The first argument is a status:
The method has thrown exception. The next argument contains $@.
A fatal error was occured (for example fork jail was killed).
Method has done. The following arguments contain all data that were returned by the method.

If "method" returns blessed object, it will provide all its methods in modified form. Each method will receive one or two additional arguments:

A callback that will be called after method has done.
Context flag for method. Default value is 0 (SCALAR).

All objects provide additional method fo_attr to access their field. Example:

    # set attribute
    $dbh->fo_attr(RaiseError => 1, sub { my ($status, $attr) = @_; ... });
    # get attribute
    $dbh->fo_attr('RaiseError', sub { my ($status, $attr) = @_; ... });

Dmitry E. Oboukhov, <unera@debian.org>

Copyright (C) 2011 by Dmitry E. Oboukhov

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.1 or, at your option, any later version of Perl 5 you may have available.

The project is placed in my git repo: <http://git.uvw.ru/?p=anyevent-forkobject;a=summary>

2021-01-08 perl v5.32.0