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# Copyright (C) 2010 Aldo Cortesi
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import Queue, threading
should_exit = False
class Msg:
def __init__(self):
self.q = Queue.Queue()
self.acked = False
def _ack(self, data=False):
if not self.acked:
self.acked = True
if data is None:
self.q.put(data)
else:
self.q.put(data or self)
def _send(self, masterq):
self.acked = False
try:
masterq.put(self, timeout=3)
while not should_exit: # pragma: no cover
try:
g = self.q.get(timeout=0.5)
except Queue.Empty:
continue
return g
except (Queue.Empty, Queue.Full): # pragma: no cover
return None
class Slave(threading.Thread):
def __init__(self, masterq, server):
self.masterq, self.server = masterq, server
self.server.set_mqueue(masterq)
threading.Thread.__init__(self)
def run(self):
self.server.serve_forever()
class Master:
def __init__(self, server):
"""
server may be None if no server is needed.
"""
self.server = server
self.masterq = Queue.Queue()
def tick(self, q):
changed = False
try:
# This endless loop runs until the 'Queue.Empty'
# exception is thrown. If more than one request is in
# the queue, this speeds up every request by 0.1 seconds,
# because get_input(..) function is not blocking.
while True:
# Small timeout to prevent pegging the CPU
msg = q.get(timeout=0.01)
self.handle(msg)
changed = True
except Queue.Empty:
pass
return changed
def run(self):
global should_exit
should_exit = False
self.server.start_slave(Slave, self.masterq)
while not should_exit:
self.tick(self.masterq)
self.shutdown()
def handle(self, msg): # pragma: no cover
c = "handle_" + msg.__class__.__name__.lower()
m = getattr(self, c, None)
if m:
m(msg)
else:
msg._ack()
def shutdown(self):
global should_exit
if not should_exit:
should_exit = True
if self.server:
self.server.shutdown()
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