Summary
You have reached the end of this chapter. Here, you learned the most important messaging and integration patterns and the role they play in the design of distributed systems. You should now have mastered the three most important types of message exchange patterns: Publish/Subscribe, Task Distribution, and Request/Reply, implemented either on top of a peer-to-peer architecture or using a broker. We analyzed the pros and cons of each pattern and architecture, and we saw that by using a broker (implementing either a message queue or data stream), it's possible to implement reliable and scalable applications with little effort, but at the cost of having one more system to maintain and scale.
You have also learned how ZeroMQ allows you to build distributed systems where you can have total control over every aspect of the architecture, fine tuning its properties around your very own requirements.
Ultimately, both approaches will give you all the tools that you need...