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Extra resources for Tuscany SCA in Action

Example text

Let’s look at each of these building blocks in turn. info Download from Wow! 3 and represents the business application we’re building with SCA and Tuscany. It’s described using the Assembly Model XML that the SCA specifications define. It defines wired components whose implementations reference the artifacts required to run the application, such as Java class files and BPEL process files. This topic is covered in chapter 3 in more detail. 3. It allows component implementations in the composite application to interact with the runtime.

What’s missing from this picture? There isn’t a single SCA-related API call in sight. Although programming models usually come with a sizable library of APIs, SCA has only a few APIs. In this simple SCA application we don’t need to use any APIs. SCA’s declarative programming style makes SCA easy to learn and use. To complete the picture, we need to make some observations about the implementation of the TripProvider component that you saw in the previous section. The code to handle trip reservations was created by GoodValueTrips to service its clients (other travel businesses) and wasn’t written using SCA.

You’ll then use the returned proxy to call the service and check trip availability f. The resulting booking code will be printed out to the console. Finally you’ll stop the node g and the program will end. When you run the JumpstartLauncher class, the application should print out: Trip booking code = 6R98Y The JumpstartLauncher class can be found in the following sample’s launchers directory: travelsample/launchers/jumpstart/src/main/java/scatours. 1. SCA provides more flexibility than the Java language by treating interfaces as equivalent if they contain the same operations, and JumpstartLauncher takes advantage of this SCA feature.

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