The producer/consumer pattern
This decoupling of the find command from the egrep command is intentional. Consumer not knowing about producers and vice versa has the following advantages:
If we use a real message broker, such as the RabbitMQ server, we can even have producers and consumers written in different programming languages. For example, we can have a producer in Java and a consumer in Python. For the Unix example too, we can write filters in different languages and connect them together.
We can have any number of producers and consumers.
If some producers or consumers fail, the system keeps operating, although less effectively.
The last point is what makes us integrate different existing systems together. This is a very powerful concept.
Brokers offer many other conveniences too, such as storing, forwarding, and reliably delivering messages. Message brokers support patterns like point-to-point messaging or publish/subscribe. Refer to https://www.rabbitmq.com/getstarted.html for more information...
