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| <h2 title="Annotation Type Init" class="title">Annotation Type Init</h2> |
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| <pre>@Retention(value=CLASS) |
| @Target(value=METHOD) |
| public @interface <span class="strong">Init</span></pre> |
| <div class="block">Annotates a method which will be invoked when the Service is initializing. |
| All required dependencies are already injected before the annotated method is called, and |
| optional dependencies on class fields are injected with NullObjects if the optional |
| dependencies are not currently available.<p> |
| |
| If some dependencies are declared using a <b>named</b> @<a href="../../../../../../org/apache/felix/dm/annotation/api/ServiceDependency.html" title="annotation in org.apache.felix.dm.annotation.api"><code>ServiceDependency</code></a> annotation, |
| then the annotated method may optionally return a Map used to dynamically configure such |
| dependencies (Please refer to @<a href="../../../../../../org/apache/felix/dm/annotation/api/ServiceDependency.html#name()"><code>ServiceDependency.name()</code></a> attribute for more |
| information about this feature).<p> |
| |
| After the init method returns, the component is then invoked in the method annotated with |
| @<a href="../../../../../../org/apache/felix/dm/annotation/api/Start.html" title="annotation in org.apache.felix.dm.annotation.api"><code>Start</code></a>, in order to notify that the component is about to be registered into the OSGi |
| registry (if this one provides a service). However, you can take control of when the service is registered, |
| using the @<a href="../../../../../../org/apache/felix/dm/annotation/api/LifecycleController.html" title="annotation in org.apache.felix.dm.annotation.api"><code>LifecycleController</code></a> annotation). |
| |
| <h3>Usage Examples</h3> |
| Here, the "VideoPlayer" init method is called after the "log" dependency is injected. |
| <blockquote> |
| <pre> |
| |
| @Component |
| public class VideoPlayer { |
| @ServiceDependency |
| LogService log; |
| |
| @Init |
| void init() {} // initialize our service (the "log" dependency is already injected). |
| } |
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