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# coding: utf-8
import sys
import time
import Queue
import threading
import multiprocessing
def coroutine(func):
""" Decorator for priming co-routines that use (yield) """
def wrapper(*args, **kwargs):
c = func(*args, **kwargs)
c.next() # prime it for iteration
return c
return wrapper
class CoroutineProcess(multiprocessing.Process):
""" Will run a coroutine in its own process, using the multiprocessing
library. The coroutine thread runs as a daemon, and is closed automatically
when it is no longer needed. Because it exposes send and close methods, a
CoroutineProcess wrapped coroutine can be dropped in for a regular
coroutine."""
def __init__(self, target_func):
multiprocessing.Process.__init__(self)
self.in_queue = multiprocessing.Queue()
self.processor = target_func
self.daemon = True
# Allows the thread to close correctly
self.shutdown = multiprocessing.Event()
def send(self, item):
if self.shutdown.is_set():
raise StopIteration
self.in_queue.put(item)
def __call__(self, *args, **kwargs):
# Prime the wrapped coroutine.
self.processor = self.processor(*args, **kwargs)
self.processor.next()
self.start()
return self
def run(self): # this is the isolated 'process' being run after start() is called
try:
while True:
item = self.in_queue.get()
self.processor.send(item) # throws StopIteration if close() has been called
except StopIteration:
pass
self.close()
def close(self):
self.processor.close()
self.shutdown.set()
def coroutine_process(func):
def wrapper(*args, **kwargs):
cp = CoroutineProcess(func)
cp = cp(*args, **kwargs)
# XXX(todo): use @CoroutineProcess on an individual function, then wrap
# with @coroutine, too. Don't start until .next().
return cp
return wrapper
class CoroutineThread(threading.Thread):
""" Wrapper for coroutines; runs in their own threads. """
def __init__(self, target_func):
threading.Thread.__init__(self) # creates a thread
self.setDaemon(True)
self.in_queue = Queue.Queue() # creates a queue for cross-thread communication
self.processor = target_func # the function to process incoming data
self.shutdown = threading.Event() # watch for close
def send(self, item):
if self.shutdown.isSet():
raise StopIteration
self.in_queue.put(item)
def __call__(self, *args, **kwargs):
# Prime the wrapped coroutine.
self.processor = self.processor(*args, **kwargs)
self.processor.next()
self.start()
return self
def run(self): # this is running in its own thread after it is created
try:
while True:
item = self.in_queue.get()
if self.shutdown.is_set(): break
self.processor.send(item)
except StopIteration:
pass
self.shutdown.set()
def close(self):
self.shutdown.set()
def coroutine_thread(func):
def wrapper(*args, **kwargs):
cp = CoroutineThread(func)
cp = cp(*args, **kwargs)
# XXX(todo): use @CoroutineProcess on an individual function, then wrap
# with @coroutine, too. Don't start until .next().
return cp
return wrapper