NAME

POE::Wheel::Sendfile - Extend POE::Wheel::ReadWrite with sendfile

SYNOPSIS

use POE::Wheel::Sendfile;

my $wheel = POE::Wheel::Sendfile->new( 
                    Handle => $socket,
                    InputEvent => 'input',
                    FlushedEvent => 'flushed',
                );
$heap->{wheel} = $wheel;

sub input {
    $heap->{wheel}->sendfile( $file );
}

sub flushed {
    delete $heap->{wheel};
}

DESCRIPTION

POE::Wheel::Sendfile extends POE::Wheel::ReadWrite and adds the possibility of using the sendfile system call to transfer data as efficiently.

It is created just like a POE::Wheel::ReadWrite would be. When you want to send a file, you call "sendfile". When sendfile is done, your FlushedEvent will be invoked.

POE::Wheel::Sendfile uses Sys::Sendfile for portable sendfile. If it is not available, it falls back to using sysread and syswrite.

METHODS

POE::Wheel::Sendfile only adds one public method to the interface:

sendfile

$wheel->sendfile( $FILE );
$wheel->sendfile( { file => $FILE,
                    [ offset => $OFFSET, ]
                    [ size => $SIZE, ]
                    [ blocksize => $BLKSIZE ]
                } );

Sends $FILE over the wheel's socket. Optionnaly starting at $OFFSET. If Sys::Sendfile is not available, will fall back to sending the file in $BLKSIZE chunks with sysread.

file => $FILE

An open filehandle or the name of a file.

offset => $OFFSET

Byte offset from which the sending will start. Optional, defaults to 0.

size => $SIZE

Number of bytes to send. Defaults to the entire file.

blocksize => $BLKSIZE

If Sys::Sendfile is not available, POE::Wheel::Sendfile will fall back to using sysread and syswrite. It will read and write $BLKSIZE bytes at once. If omited, the socket's SO_SNDBUF size is used. If that is unavailable, the block size is 7500 bytes (5 ethernet frames).

SEE ALSO

POE, POE::Wheel::ReadWrite.

AUTHOR

Philip Gwyn, <gwyn -at- cpan.org>

COPYRIGHT AND LICENSE

Copyright (C) 2010, 2011 by Philip Gwyn

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available.