Source code for dragonfly.engines.backend_natlink

#
# This file is part of Dragonfly.
# (c) Copyright 2007, 2008 by Christo Butcher
# Licensed under the LGPL.
#
#   Dragonfly is free software: you can redistribute it and/or modify it 
#   under the terms of the GNU Lesser General Public License as published 
#   by the Free Software Foundation, either version 3 of the License, or 
#   (at your option) any later version.
#
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#   WITHOUT ANY WARRANTY; without even the implied warranty of 
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
#   Lesser General Public License for more details.
#
#   You should have received a copy of the GNU Lesser General Public 
#   License along with Dragonfly.  If not, see 
#   <http://www.gnu.org/licenses/>.
#

"""
SR back-end package for DNS and Natlink
============================================================================

"""

import logging
_log = logging.getLogger("engine.natlink")


#---------------------------------------------------------------------------

# Module level singleton instance of this engine implementation.
_engine = None


[docs]def is_engine_available(): """ Check whether Natlink is available. """ global _engine if _engine: return True # Attempt to import natlink. try: import natlink except ImportError, e: _log.info("Failed to import natlink package: %s" % (e,)) return False except Exception, e: _log.exception("Exception during import of natlink package: %s" % (e,)) return False try: if natlink.isNatSpeakRunning(): return True else: _log.info("Natlink is available but NaturallySpeaking is not" " running.") return False except Exception, e: _log.exception("Exception during natlink.isNatSpeakRunning(): %s" % (e,)) return False
[docs]def get_engine(): """ Retrieve the Natlink back-end engine object. """ global _engine if not _engine: from .engine import NatlinkEngine _engine = NatlinkEngine() return _engine