NAME

       Statistics::R::IO::Rserve - Supply object methods for Rserve communication

VERSION

       version 1.0002

SYNOPSIS

           use Statistics::R::IO::Rserve;

           my $rserve = Statistics::R::IO::RDS->new('someserver');
           my $var = $rserve->eval('1+1');
           print $var->to_pl;
           $rserve->close;

DESCRIPTION

       "Statistics::R::IO::Rserve" provides an object-oriented interface to communicate with the Rserve
       <http://www.rforge.net/Rserve/> binary R server.

       This allows Perl programs to access all facilities of R without the need to have a local install of R or
       link to an R library.

METHODS

   CONSTRUCTOR
       new $server
           The single-argument constructor can be invoked with a scalar containing the host name of the Rserve
           server. The method will immediately open a connection to the server using IO::Socket::INET and
           perform the initial steps prescribed by the protocol. The method will raise an exception if the
           connection cannot be established or if the remote host does not appear to run the correct version of
           Rserve.

       new $handle
           The single-argument constructor can be invoked with an instance of IO::Handle containing the
           connection to the Rserve server, which becomes the 'fh' attribute. The caller is responsible for
           ensuring that the connection is established and ready for submitting client requests.

       new ATTRIBUTE_HASH_OR_HASH_REF
           The constructor's arguments can also be given as a hash or hash reference, specifying values of the
           object attributes. The caller passing the handle is responsible for ensuring that the connection is
           established and ready for submitting client requests.

       new The no-argument constructor uses the default server name 'localhost' and port 6311 and immediately
           opens a connection to the server using IO::Socket::INET, performing the initial steps prescribed by
           the protocol. The method will raise an exception if the connection cannot be established or if the
           remote host does not appear to run the correct version of Rserve.

   ACCESSORS
       server
           Name of the Rserve server.

       port
           Port of the Rserve server.

       fh  A connection handle (stored as a reference to the IO::Handle) to the Rserve server.

   METHODS
       eval EXPR
           Evaluates an R expression, given as text string in REXPR, on an Rserve
           <http://www.rforge.net/Rserve/> server and returns its result as a Statistics::R::REXP object.

       ser_eval EXPR
           Evaluates an R expression, given as text string in REXPR, on an Rserve
           <http://www.rforge.net/Rserve/> server and returns its result as a Statistics::R::REXP object. This
           method uses the CMD_serEval Rserve command (code 0xf5), which is designated as "internal/special" and
           "should not be used by clients". Consequently, it is not recommended to use this method in a
           production environment, but only to help debug cases where "eval" isn't working as desired.

       get_file REMOTE_NAME [, LOCAL_NAME]
           Transfers a file named REMOTE_NAME from the Rserve server to the local machine, copying it to
           LOCAL_NAME if it is specified. The file is transferred in binary mode. Returns the contents of the
           file as a scalar.

       close
           Closes the object's filehandle. This method is automatically invoked when the object is destroyed if
           the connection was opened by the constructor, but not if it was passed in as a pre-opened handle.

BUGS AND LIMITATIONS

       Instances of this class are intended to be immutable. Please do not try to change their value or
       attributes.

       There are no known bugs in this module. Please see Statistics::R::IO for bug reporting.

SUPPORT

       See Statistics::R::IO for support and contact information.

AUTHOR

       Davor Cubranic <cubranic@stat.ubc.ca>

COPYRIGHT AND LICENSE

       This software is Copyright (c) 2017 by University of British Columbia.

       This is free software, licensed under:

         The GNU General Public License, Version 3, June 2007