Next Generation Application Integration: From Simple Information to Web Services

BPEL4WS by Example

So, now that we know some of the details behind BPEL4WS, perhaps it's best to walk through an example to bring the concepts home. Let's return to our broker example.

When receiving an order from a client, the broker example creates three process instances that are required to carry out the order (see Figure 13.2):

1.	Booking the order into the order management system
2.	Executing the trade
3.	Deducting the amount of the trade from the client's cash account

Figure 13.2. A graphical representation of our example BPEL4WS process to book the purchase of a stock.

In the world of process integration, as you may remember from the previous ...