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use strict; |
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use warnings; |
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package Data::Stream::Bulk::AnyEvent; |
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# ABSTRACT: AnyEvent-friendly Data::Stream::Bulk::Callback |
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our $VERSION = 'v0.0.2'; # VERSION: |
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use Moose; |
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use AnyEvent; |
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use Carp; |
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with qw(Data::Stream::Bulk); |
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has _cv => ( |
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is => 'rw', |
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isa => 'Maybe[AnyEvent::CondVar]', |
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default => undef, |
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); |
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has _done => ( |
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is => 'rw', |
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isa => 'Bool', |
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default => 0 |
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); |
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has cb => ( |
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is => 'rw', |
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isa => 'Maybe[CodeRef]', |
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trigger => \&_on_cb_set, |
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default => undef, |
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); |
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has callback => ( |
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is => 'ro', |
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isa => 'CodeRef', |
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required => 1 |
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); |
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sub is_done |
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{ |
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my $self = shift; |
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return $self->_done; |
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} |
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sub next |
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{ |
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my $self = shift; |
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return if $self->is_done; |
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$self->cb(undef) if $self->cb; |
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$self->_cv($self->callback->()) if(! $self->_cv); |
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my $ret = $self->_cv->recv; |
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$self->_cv(undef); |
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$self->_done(1) if ! defined $ret; |
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return $ret; |
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} |
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sub _on_cb_set |
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{ |
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my ($self, $new, $old) = @_; |
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return if !defined($new) && !defined($old); |
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if(defined($new)) { |
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my $sub; $sub = sub { |
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my $ret = shift; |
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$self->_cv(undef); |
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$self->_done(1) if(! defined $ret->recv); |
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if($new->($ret) && defined $ret->recv) { |
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$self->_cv($self->callback->()); |
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$self->_cv->cb($sub); |
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} |
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}; |
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$self->_cv($self->callback->()) if(! $self->_cv); |
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$self->_cv->cb($sub); |
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} else { |
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$self->_cv->croak(q{Callback `cb' was set as undef during active iteration}) if $self->_cv; |
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} |
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} |
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__PACKAGE__->meta->make_immutable; |
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1; |
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__END__ |
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=pod |
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86
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=head1 NAME |
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Data::Stream::Bulk::AnyEvent - AnyEvent-friendly Data::Stream::Bulk::Callback |
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=head1 VERSION |
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version v0.0.2 |
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=head1 SYNOPSIS |
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# Default to blocking-mode |
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my $stream = Data::Stream::Bulk::AnyEvent->new( |
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# Producer callback has no arguments, and MUST return condition variable. |
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# Items are sent via the condition variable as array ref. |
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# If there are no more data, send undef. |
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producer => sub { |
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my $cv = AE::cv; |
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my $w; $w = AE::timer 1, 0, sub { # Useless, just an example |
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undef $w; |
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my $entry = shift @data; # defined like my @data = ([1,2], [2,3], undef); |
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$cv->send($entry); |
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}; |
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return $cv; |
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} |
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); |
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# In this mode, you can use this class like other Data::Stream::Bulk subclasses, at client side |
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# NOTE that calling C<next> includes blocking wait AE::cv->recv() internally. |
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$stream->next if ! $stream->is_done; |
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# Callback-mode |
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# This is natrual mode for asynchronous codes. |
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# Callback is called for each producer call. |
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# If you want to get more items, callback SHOULD return true. If not, return false. |
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my $stream = Data::Stream::Bulk::AnyEvent->new( |
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callback => sub { ... }, ... |
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)->cb(sub { my $ref = shift->recv; ... return defined $ref; }); |
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=head1 DESCRIPTION |
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This class is like L<Data::Stream::Bulk::Callback>, but there are some differences. |
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=over 4 |
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129
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=item * |
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Consumer side can use asynchronous callback style. |
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=item * |
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Producer callback does not return actual items but returns a condition variable. Items are sent via the condition variable. |
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=back |
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Primary purpose of this class is to make L<Net::Amazon::S3>, using L<Data::Stream::Bulk::Callback>, AnyEvent-friendly by using L<Module::AnyEvent::Helper::Filter>. |
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=head1 ATTRIBUTES |
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=head2 C<callback =E<gt> sub { my $cv = AE::CV; ... return $cv; }> |
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Same as L<Data::Stream::Bulk::Callback>. |
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Specify callback code reference called when data is requested. |
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This attribute is C<required>. Therefore, you need to specify in constructor argument. |
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There is no argument of the callback. Return value MUST be a condition variable that items are sent as an array reference. |
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If there is no more items, send C<undef>. |
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=head2 C<cb =E<gt> sub { my ($cv) = @_; }> |
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Specify callback code reference called for each producer call. |
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A parameter of the callback is an AnyEvent condition variable. |
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If the callback returns true, iteration is continued. |
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If false, iteration is suspended. |
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If you need to resume iteration, you should call C<next> or set C<cb> again even though the same C<cb> is used. |
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If you do not need callback, call C<next> or set C<cb> as C<undef>. |
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Setting C<cb> as C<undef> is succeeded only when iteration is not active, which means suspended or not started. |
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To set C<callback> as not-C<undef> means this object goes into callback mode, |
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while to set C<callback> as C<undef> means this object goes into blocking mode. |
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You can change this value during lifetime of the object, except for the limitation described above. |
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=head1 METHODS |
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=head2 C<next()> |
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Same as L<Data::Stream::Callback>. |
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If called in callback mode, the object goes into blocking mode and callback is canceled. |
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=head2 C<is_done()> |
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Same as L<Data::Stream::Callback>. |
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=head1 AUTHOR |
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Yasutaka ATARASHI <yakex@cpan.org> |
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183
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=head1 COPYRIGHT AND LICENSE |
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185
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This software is copyright (c) 2012 by Yasutaka ATARASHI. |
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187
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This is free software; you can redistribute it and/or modify it under |
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the same terms as the Perl 5 programming language system itself. |
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190
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=cut |