Blockchain Development with Hyperledger

Messages carry event notifications

We think of messages as the carriers of event notifications. In the real world, we are notified of events via sent by text messages, or email, or maybe a newsfeed. We therefore make a distinction between an event and the communication of it. This is a very important distinction to make, because it illustrates that we are coupled to the event via a medium.

Let us now plant the idea—which we will return to later—that although there is a singular event, multiple participants can be notified via separate message notifications. We see that there is a loose coupling between event-producer and event-consumer. It all means events have a slightly intangible quality—their slightly abstract nature makes them hard to ...