Firstly, we will develop an event-driven BPEL process. This is a BPEL process triggered by a business event. We will develop a process for book shelving. As we have already mentioned, such a process can be executed on various occasions, such as when a book arrives to the bookstore for the first time, after a customer has looked at the book, or even during an inventory.

In contrast to a BPEL process, which exposes an operation that needs to be invoked explicitly, our book shelving process will react on a business event. We will call it a BookshelfEvent.

We can see that in order to develop an event-driven BPEL process, we will need to firstly declare a business event, the BookshelfEvent. Following this, we will need to develop the event-driven book shelving BPEL process.