class STMessenger (object):
def __init__(self):
self.mqueue = QueueComms()
def send_event_update(self, event_list):
"""Send an event update to the scanning thread.
:param event_list: tuple of event name and state
:returns: None
:raises: ValueError if event_list is mal-formed.
"""
if isinstance(event_list, tuple) and len(event_list) == 2:
self.mqueue.send_to_child(event_list)
else:
logger.error("Event list: {}".format(event_list))
raise ValueError("Bad event update attempt.")
def update_queued(self):
"""Check is there is an event update waiting to be processed.
:returns: True if event waiting
"""
return self.mqueue.queued_for_child()
def get_event_update(self):
"""Get the next event waiting to be processed.
:returns: event_list (may be empty)
"""
event_list = []
try:
event_list = self.mqueue.get_from_child()
except Exception:
logger.exception("Exception while accessing a child queue.")
return event_list
def notify_end_of_scan(self):
"""Notify main thread that scanning thread has terminated.
:returns: None
"""
self.mqueue.signal_parent(1)
def check_end_of_scan(self):
""" Check to see if the scanning thread as notified us of its
termination.
:returns: True if termination signal sent.
"""
return (self.mqueue.get_from_parent() == 1)
def __init__(self):
self.mqueue = QueueComms()
class STMessenger(object):
def __init__(self):
self.mqueue = QueueComms()
def send_event_update(self, event_list):
"""Send an event update to the scanning thread.
:param event_list: tuple of event name and state
:returns: None
:raises: ValueError if event_list is mal-formed.
"""
if isinstance(event_list, tuple) and len(event_list) == 2:
self.mqueue.send_to_child(event_list)
else:
logger.error("Event list: {}".format(event_list))
raise ValueError("Bad event update attempt.")
def update_queued(self):
"""Check is there is an event update waiting to be processed.
:returns: True if event waiting
"""
return self.mqueue.queued_for_child()
def get_event_update(self):
"""Get the next event waiting to be processed.
:returns: event_list (may be empty)
"""
event_list = []
try:
event_list = self.mqueue.get_from_child()
except Exception:
logger.exception("Exception while accessing a child queue.")
return event_list
def notify_end_of_scan(self):
"""Notify main thread that scanning thread has terminated.
:returns: None
"""
self.mqueue.signal_parent(1)
def check_end_of_scan(self):
""" Check to see if the scanning thread as notified us of its
termination.
:returns: True if termination signal sent.
"""
return (self.mqueue.get_from_parent() == 1)
def notify_end_of_sync(self):
self.mqueue.signal_parent(1)
def check_end_of_sync(self):
return (self.mqueue.get_from_parent() == 1)
def __init__(self):
self.mqueue = QueueComms()