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| <h2 title="Annotation Type Composition" class="title">Annotation Type Composition</h2> |
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| <pre>@Retention(value=CLASS) |
| @Target(value=METHOD) |
| public @interface <span class="memberNameLabel">Composition</span></pre> |
| <div class="block">Annotates a method returning the list of objects which are part of a Component implementation. |
| When implementing complex Components, you often need to use more than one object instances. |
| Moreover, several of these instances might want to have dependencies injected, as well as lifecycle |
| callbacks invoked, like the methods annotated with <a href="../../../../../../org/apache/felix/dm/annotation/api/Init.html" title="annotation in org.apache.felix.dm.annotation.api"><code>Init</code></a>, <a href="../../../../../../org/apache/felix/dm/annotation/api/Start.html" title="annotation in org.apache.felix.dm.annotation.api"><code>Start</code></a>, <a href="../../../../../../org/apache/felix/dm/annotation/api/Stop.html" title="annotation in org.apache.felix.dm.annotation.api"><code>Stop</code></a>, |
| <a href="../../../../../../org/apache/felix/dm/annotation/api/Destroy.html" title="annotation in org.apache.felix.dm.annotation.api"><code>Destroy</code></a> annotations. In such cases you can tell the dependency manager which instances to |
| consider, by annotating a method in your Component, returning a list of objects which are part |
| of the implementation. |
| <p> |
| This annotation may be applied on a method which is part of class annotated with either a <a href="../../../../../../org/apache/felix/dm/annotation/api/Component.html" title="annotation in org.apache.felix.dm.annotation.api"><code>Component</code></a>, |
| <a href="../../../../../../org/apache/felix/dm/annotation/api/AspectService.html" title="annotation in org.apache.felix.dm.annotation.api"><code>AspectService</code></a>, <a href="../../../../../../org/apache/felix/dm/annotation/api/AdapterService.html" title="annotation in org.apache.felix.dm.annotation.api"><code>AdapterService</code></a>, <a href="../../../../../../org/apache/felix/dm/annotation/api/FactoryConfigurationAdapterService.html" title="annotation in org.apache.felix.dm.annotation.api"><code>FactoryConfigurationAdapterService</code></a> or |
| <a href="../../../../../../org/apache/felix/dm/annotation/api/ResourceAdapterService.html" title="annotation in org.apache.felix.dm.annotation.api"><code>ResourceAdapterService</code></a> annotation. |
| |
| <h3>Usage Examples</h3> |
| |
| <p> Here, the "MyComponent" component is composed of the Helper class, which is also injected with |
| service dependencies. The lifecycle callbacks are also invoked in the Helper (if the Helper defines |
| them): |
| <blockquote> |
| <pre> |
| |
| class Helper { |
| LogService logService; // Injected |
| void start() {} // lifecycle callback |
| void bind(OtherService otherService) {} // injected |
| } |
| |
| @Component |
| class MyComponent { |
| // Helper which will also be injected with our service dependencies |
| private Helper helper = new Helper(); |
| |
| @Composition |
| Object[] getComposition() { |
| return new Object[] { this, helper }; |
| } |
| |
| @ServiceDependency |
| private LogService logService; // Helper.logService will be also be injected, if defined. |
| |
| @Start |
| void start() {} // the Helper.start() method will also be called, if defined |
| |
| @ServiceDependency |
| void bind(OtherService otherService) {} // the Helper.bind() method will also be called, if defined |
| } |
| </pre> |
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