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Internally it calls select on the input file handles for those parsers to wait for one or more of them to have input available. See L for an example of its use. =head1 METHODS =head2 Class Methods =head3 C my $mux = TAP::Parser::Multiplexer->new; Returns a new C object. =cut # new() implementation supplied by TAP::Object sub _initialize { my $self = shift; $self->{select} = IO::Select->new; $self->{avid} = []; # Parsers that can't select $self->{count} = 0; return $self; } ############################################################################## =head2 Instance Methods =head3 C $mux->add( $parser, $stash ); Add a TAP::Parser to the multiplexer. C<$stash> is an optional opaque reference that will be returned from C along with the parser and the next result. =cut sub add { my ( $self, $parser, $stash ) = @_; if ( SELECT_OK && ( my @handles = $parser->get_select_handles ) ) { my $sel = $self->{select}; # We have to turn handles into file numbers here because by # the time we want to remove them from our IO::Select they # will already have been closed by the iterator. my @filenos = map { fileno $_ } @handles; for my $h (@handles) { $sel->add( [ $h, $parser, $stash, @filenos ] ); } $self->{count}++; } else { push @{ $self->{avid} }, [ $parser, $stash ]; } } =head3 C my $count = $mux->parsers; Returns the number of parsers. Parsers are removed from the multiplexer when their input is exhausted. =cut sub parsers { my $self = shift; return $self->{count} + scalar @{ $self->{avid} }; } sub _iter { my $self = shift; my $sel = $self->{select}; my $avid = $self->{avid}; my @ready = (); return sub { # Drain all the non-selectable parsers first if (@$avid) { my ( $parser, $stash ) = @{ $avid->[0] }; my $result = $parser->next; shift @$avid unless defined $result; return ( $parser, $stash, $result ); } unless (@ready) { return unless $sel->count; @ready = $sel->can_read; } my ( $h, $parser, $stash, @handles ) = @{ shift @ready }; my $result = $parser->next; unless ( defined $result ) { $sel->remove(@handles); $self->{count}--; # Force another can_read - we may now have removed a handle # thought to have been ready. @ready = (); } return ( $parser, $stash, $result ); }; } =head3 C Return a result from the next available parser. Returns a list containing the parser from which the result came, the stash that corresponds with that parser and the result. my ( $parser, $stash, $result ) = $mux->next; If C<$result> is undefined the corresponding parser has reached the end of its input (and will automatically be removed from the multiplexer). When all parsers are exhausted an empty list will be returned. if ( my ( $parser, $stash, $result ) = $mux->next ) { if ( ! defined $result ) { # End of this parser } else { # Process result } } else { # All parsers finished } =cut sub next { my $self = shift; return ( $self->{_iter} ||= $self->_iter )->(); } =head1 See Also L L =cut 1;