NAME

GRID::Machine::Message - Primitives for sending and receiving

DESCRIPTION

This class is used by both the local and the remote sides of the GRID::Machine. It implements the low level communication layer. It is responsible of marshalling the data.

The read_operation Method

Syntax:

   my ( $operation, @args ) = $server->read_operation( );

Returns the kind of operation and the data sent by the other side of the SSH link.

The send_operation Method

Examples:

  $server->send_operation("RETURNED", GRID::Machine::Result->new( %arg ));

  $server->send_operation("DIED", GRID::Machine::Result->new( 
                                    errmsg  => "$server->{host}: $message")
  );

  $server->send_operation("RETURNED", exists($server->{stored_procedures}{$name}));

SEE ALSO

• GRID::Machine

• GRID::Machine::IOHandle

• GRID::Machine::Group

• GRID::Machine::Process

• GRID::Machine::perlparintro

• Net::OpenSSH

• IPC::PerlSSH

• IPC::PerlSSH::Async

• Man pages of ssh, ssh-key-gen, ssh_config, scp, ssh-agent, ssh-add, sshd

• http://www.openssh.com

AUTHOR

Casiano Rodriguez Leon <casiano@ull.es>

ACKNOWLEDGMENTS

This work has been supported by CEE (FEDER) and the Spanish Ministry of Educacion y Ciencia through Plan Nacional I+D+I number TIN2005-08818-C04-04 (ULL::OPLINK project http://www.oplink.ull.es/). Support from Gobierno de Canarias was through GC02210601 (Grupos Consolidados). The University of La Laguna has also supported my work in many ways and for many years.

I wish to thank Paul Evans for his IPC::PerlSSH module: it was the source of inspiration for this module. To Alex White, Dmitri Kargapolov, Eric Busto and Erik Welch for their contributions. To the Perl Monks, and the Perl Community for generously sharing their knowledge. Finally, thanks to Juana, Coro and my students at La Laguna.

LICENCE AND COPYRIGHT

Copyright (c) 2007 Casiano Rodriguez-Leon (casiano@ull.es). All rights reserved.

These modules are free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.