| [[tut-services-step1,Step 1 - Creating a ServiceComposite]] |
| = Step 1 - Creating a ServiceComposite = |
| |
| In this tutorial we start with basic Java classes, to simulate a very simple Library where you can borrow |
| and return books. |
| |
| Qi4j relies heavily on the use of interfaces. This makes it possible for an object |
| to externally implement a number of interfaces which internally is backed by a number |
| of Mixins, some of which you may have written yourself, and some of which may have been |
| reused. This is also true for services, which we are to cover in this tutorial. |
| |
| The first task is therefore to refactor the code so that the methods are implemented from an |
| interface instead, and to essentially make the identical "application" into a Qi4j application. |
| We also want the Book to be a ValueComposite. |
| |
| Steps for this tutorial: |
| |
| - Make the Book into a ValueComposite. |
| - Make the Library an interface with the same methods. We call this a MixinType. |
| - Create a LibraryMixin class, which implements the Library interface. |
| - Create a LibraryService that binds the LibraryMixin. |
| - The LibraryMixin will need to be injected with the ValueBuilderFactory in the @Structure scope. |
| |
