PubSub vs MessageQueue vs Request & Response

Name	Solve	Use Case	Example
PubSub		broadcast one message to multiple listeners, and don’t care about how the message gonna be dealt with
Message Queue	asynchronous processing	task has unpredictable processing time and may used up server and network resources	Order at McDonalds
Request & Response

• PubSub: don’t care about whether message is properly processed. 1-M (Publisher, vs Subscriber)
• Message Queue: care about message must be processed once and in right order. 1-1 (Producer vs Consumer)