Customer orders business if there is a scene, and inventory business orders via the MQ inventory deduct
Order business will query whether to have inventory, so send the MQ to inventory system

Question is: stock out of the question, there has been no news consumption, this means that there has always been inventory, orders there query to have inventory has been deducted, actually inventory would have not only with messages, have this scenario? How to break the

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Order business will query whether to have inventory, so send the MQ to inventory system, how to query whether have inventory, if through the message, should still can not return the information