/
12_active_object.py
155 lines (108 loc) · 3.71 KB
/
12_active_object.py
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from time import sleep
import queue
import threading
class RealResult:
def __init__(self, string):
self.result_value = string
def get_result_value(self):
return self.result_value
class Servant:
@staticmethod
def make_string(count, fill_char):
buffer = "" * count
for i in range(count):
buffer = buffer[:i] + fill_char + buffer[i+1:]
sleep(0.1)
return RealResult(buffer)
@staticmethod
def display_string(string):
print("display string:", string)
sleep(0.01)
class SchedulerThread(threading.Thread):
def __init__(self, aqueue):
super(SchedulerThread, self).__init__()
self.queue = aqueue
def invoke(self, request):
self.queue.put(request)
def run(self):
while True:
request = self.queue.get()
request.execute()
class DisplayStringRequest:
def __init__(self, servant, string):
self.servant = servant
self.string = string
def execute(self):
self.servant.display_string(self.string)
class MakeStringRequest:
def __init__(self, servant, future, count, fill_char):
self.count = count
self.servant = servant
self.future = future
self.fill_char = fill_char
def execute(self):
result = self.servant.make_string(self.count, self.fill_char)
self.future.set_result(result)
class FutureResult:
def __init__(self):
self.result = None
self.ready = False
self.cv = threading.Condition()
def set_result(self, result):
with self.cv:
self.result = result
self.ready = True
self.cv.notify_all()
def get_result_value(self):
with self.cv:
while not self.ready:
self.cv.wait()
return self.result.get_result_value()
return self.result.get_result_value()
class Proxy:
def __init__(self, scheduler, servant):
self.scheduler = scheduler
self.servant = servant
def make_string(self, count, fill_char):
future = FutureResult()
self.scheduler.invoke(MakeStringRequest(self.servant, future, count, fill_char))
return future
def display_string(self, string):
self.scheduler.invoke(DisplayStringRequest(self.servant, string))
class DisplayClientThread(threading.Thread):
def __init__(self, name, active_object):
super(DisplayClientThread, self).__init__()
self.name = name
self.active_object = active_object
def run(self):
for i in range(10**5):
string = self.name + " " + str(i)
self.active_object.display_string(string)
sleep(0.2)
class MakerClientThread(threading.Thread):
def __init__(self, name, active_object):
super(MakerClientThread, self).__init__()
self.name = name
self.active_object = active_object
self.fill_char = name[0]
def run(self):
for i in range(10**5):
result = self.active_object.make_string(i, self.fill_char)
sleep(0.1)
value = result.get_result_value()
print(self.name, ": value = ", value)
class ActiveObjectFactory:
@staticmethod
def create_active_object():
servant = Servant()
activation_queue = queue.Queue(maxsize=100)
scheduler = SchedulerThread(activation_queue)
proxy = Proxy(scheduler, servant)
scheduler.start()
return proxy
def main():
active_object = ActiveObjectFactory.create_active_object()
MakerClientThread("Alice", active_object).start()
MakerClientThread("Bobby", active_object).start()
DisplayClientThread("Chris", active_object).start()
main()