问题描述
在消息总线的开发环境中,我想让自己陷入困境(!),因为我试图确保给定的队列(或其代理)没有为同一队列注册两次。消息类型。
print(registration) # gives:
RegisterHandlerQueue(messageType=<class 'TestMessage'>,handlerQueue=<Autoproxy[Queue] object,typeid 'Queue' at 0x21da2b12490>
)
# great,as expected
print(handlersQueues[registration.messageType]) # gives:
[<Autoproxy[Queue] object,typeid 'Queue' at 0x21da2b12670>]
# somewhat confusing (different memory address from above)
# but probably ok.
# the storage structure has the form: {messageType:[queue1,queue2,...]}
print(registration.handlerQueue) # gives:
<queue.Queue object at 0x00000214A15B28E0>
# very problematic: I cannot compare the handlerQueue stored
# in the registration message with the one stored in the
# handlersQueues dictionary!
print({"test":registration.handlerQueue}) # gives:
{'test': <Autoproxy[Queue] object,typeid 'Queue' at 0x21da2b12490>}
# here it appears as soon as I place the queue in a dictionary,# the proxy is stored instead. Interestingly,it has the same
# address as the proxy stored in the registration message.
最重要的问题是:如何验证两个Autoproxy [Queue]对象指向同一队列或一个Autoproxy指向给定队列?
解决方法
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