class LoggingBase(
deprecation.moved_inheritable_class(DumpingListener,
'LoggingBase',
__name__,
version="0.6",
removal_version="?")):
def _dump(self, message, *args, **kwargs):
self._log(message, *args, **kwargs)
@abc.abstractmethod
def _log(self, message, *args, **kwargs):
"""Logs the provided *templated* message to some output."""
def prepare(self):
"""Performs any pre-run, but post-compilation actions.
NOTE(harlowja): During preparation it is currently assumed that the
underlying storage will be initialized, all final dependencies
will be verified, the tasks will be reset and the engine will enter
the PENDING state.
"""
@abc.abstractmethod
def run(self):
"""Runs the flow in the engine to completion (or die trying)."""
@abc.abstractmethod
def suspend(self):
"""Attempts to suspend the engine.
If the engine is currently running tasks then this will attempt to
suspend future work from being started (currently active tasks can
not currently be preempted) and move the engine into a suspend state
which can then later be resumed from.
"""
# TODO(harlowja): remove in 0.7 or later...
EngineBase = deprecation.moved_inheritable_class(Engine,
'EngineBase',
__name__,
version="0.6",
removal_version="?")
@abc.abstractmethod
def prepare(self):
"""Performs any pre-run, but post-compilation actions.
NOTE(harlowja): During preparation it is currently assumed that the
underlying storage will be initialized, all final dependencies
will be verified, the tasks will be reset and the engine will enter
the PENDING state.
"""
@abc.abstractmethod
def run(self):
"""Runs the flow in the engine to completion (or die trying)."""
@abc.abstractmethod
def suspend(self):
"""Attempts to suspend the engine.
If the engine is currently running tasks then this will attempt to
suspend future work from being started (currently active tasks can
not currently be preempted) and move the engine into a suspend state
which can then later be resumed from.
"""
# TODO(harlowja): remove in 0.7 or later...
EngineBase = deprecation.moved_inheritable_class(Engine,
'EngineBase', __name__,
version="0.6",
removal_version="?")
return self
def __exit__(self, type, value, tb):
try:
self.deregister()
except Exception:
# Don't let deregistering throw exceptions
LOG.warn("Failed deregistering listeners from engine %s",
self._engine,
exc_info=True)
# TODO(harlowja): remove in 0.7 or later...
ListenerBase = deprecation.moved_inheritable_class(Listener,
'ListenerBase',
__name__,
version="0.6",
removal_version="?")
@six.add_metaclass(abc.ABCMeta)
class DumpingListener(Listener):
"""Abstract base class for dumping listeners.
This provides a simple listener that can be attached to an engine which can
be derived from to dump task and/or flow state transitions to some target
backend.
To implement your own dumping listener derive from this class and
override the ``_dump`` method.
"""
def __enter__(self):
self.register()
return self
def __exit__(self, type, value, tb):
try:
self.deregister()
except Exception:
# Don't let deregistering throw exceptions
LOG.warn("Failed deregistering listeners from engine %s",
self._engine, exc_info=True)
# TODO(harlowja): remove in 0.7 or later...
ListenerBase = deprecation.moved_inheritable_class(Listener,
'ListenerBase', __name__,
version="0.6",
removal_version="?")
@six.add_metaclass(abc.ABCMeta)
class DumpingListener(Listener):
"""Abstract base class for dumping listeners.
This provides a simple listener that can be attached to an engine which can
be derived from to dump task and/or flow state transitions to some target
backend.
To implement your own dumping listener derive from this class and
override the ``_dump`` method.
"""