问题
Can PHP treat AMQP like an RPC service, and send a message and block until a reply is returned? Are there any good examples of this, and do any libraries wrap such functionality up in an easy-to-use way?
I'd like to have the flexibility of a brokered messaging system, but shield the web tier from needing to know about its asynchronous nature.
回答1:
Sure, absolutely. Look at how an RPC-style request flows around a system:
- A request is issued
- The requester now blocks waiting for a reply to that request
That's completely implementable with an asynchronous message system like AMQP. You just need to do the RPC correlation yourself:
- Send your request within an asynchronous message with a unique ID within it (this does not block)
- Receive messages from the messaging system and block until you get a message back with the same unique ID (that means you've just received your reply)
RabbitMQ, an AMQP broker, offers documentation online on how to do exactly this.
来源：https://stackoverflow.com/questions/9381909/synchronous-amqp-from-php