需要将更新事件传递给同一个python脚本的多个正在运行的实例

时间:2012-04-16 16:48:48

标签: python state

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?

1 个答案:

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。