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| |
| [[tut-composites-step2,Step 2 - Creating a Transient Composite]] |
| = Step 2 - Creating a Transient Composite = |
| |
| Previous step was <<tut-composites-step1>>. |
| |
| In this step we will create a TransientComposite interface that ties all pieces together. The TransientComposite |
| interface is a regular Java interface which extends the interfaces you want to expose from your domain model, and which |
| uses various annotations to declare what Fragments to include. Fragments include Mixins, Concerns, SideEffects and |
| Constraints. In this tutorial we will only use Mixins. When a TransientComposite is instantiated at runtime the |
| framework will inspect the interface to determine what the TransientComposite instance should look like in terms of |
| used Fragments. |
| |
| In Zestâ„¢ all method parameters are considered mandatory unless marked as @Optional. Therefore you can remove the null |
| checks in the Mixin. If a null value is passed in an exception will be thrown by Zestâ„¢. |
| |
| Steps for this tutorial: |
| |
| - Create an interface that extends the domain interface HelloWorld and org.qi4j.api.composite.TransientComposite. |
| - Add a @Mixins annotation to it with the name of the Mixin as argument. |
| |
| == Solution == |
| |
| These ones remain unchanged: |
| |
| - +HelloWorld.java+ |
| - +HelloWorldBehaviour.java+ |
| - +HelloWorldState.java+ |
| |
| *HelloWorldComposite.java* |
| [snippet,java] |
| ---- |
| source=tutorials/composites/src/main/java/org/qi4j/tutorials/composites/tutorial3/HelloWorldComposite.java |
| tag=solution |
| ---- |
| |
| *HelloWorldMixin.java* |
| [snippet,java] |
| ---- |
| source=tutorials/composites/src/main/java/org/qi4j/tutorials/composites/tutorial2/HelloWorldMixin.java |
| tag=solution |
| ---- |
| |
| |
| Next step is <<tut-composites-step3>> |