我需要将更新事件传递给我的python脚本的所有正在运行的实例,并且我希望尽可能简化代码。我没有在运行进程之间进行通信的经验。到目前为止,我一直在读/写配置文件,每个实例都会读取和/或更新。
这是我编写的一些伪代码(一种简单的模板),以解决如何解决这个问题。请尽量帮助我填补空白。请记住,我没有套接字,线程等经验......
import process # imaginary module
class AppA():
def __init__(self):
# Every instance that opens will need to attach
# itself to the "Instance Manager". If no manager
# exists, then we need to spawn it. Only one manager
# will ever exist no matter how many instances are
# running.
try:
hm = process.get_handle(AppA_InstanceManager)
except NoSuchProgError:
hm.spawn_instance(AppA_InstanceManager)
finally:
hm.register(self)
self.instance_manager = hm
def state_update(self):
# This method won't exist in the real code, however,
# it emulates internal state changes for the sake of
# explaination.
#
# When any internal state changes happen, we will then
# propagate the changes outward by calling the
# appropriate method of "self.instance_manager".
self.instance_manager.propagate_state()
def cb_state_update(self):
# Called from the "Instance Manager" only!
#
# This may be as simple as reading a known
# config file. Or could simply pass data
# to this method.
class AppA_InstanceManager():
def __init__(self):
self.instances = []
def register_instance(self, instance):
self.instances.append(instance)
def unregister_instance(self, instance):
# nieve example for now.
self.instances.remove(instance)
def propagate_state(self):
for instance in self.instances:
instance.cb_state_update(data)
if __name__ == '__main__':
app = AppA()
任何建议?
答案 0 :(得分:1)
这种设计有几种选择。
你可以使用一个消息队列,它是为这种东西制作的,例如: AMQP或一些ZeroMQ或类似的东西。
或者您可以使用Redis或其他(内存中)数据库之类的东西进行同步。
如果您不想使用类似的东西,可以使用多处理模块同步。
或使用特定于平台的IPC系统,例如通过mmap,sysv套接字等共享内存
如果你想按照你解释的方式做事,你可以看看Twisteds透视经纪人。