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| <h2 title="Annotation Type LifecycleController" class="title">Annotation Type LifecycleController</h2> |
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| <pre>@Retention(value=CLASS) |
| @Target(value=FIELD) |
| public @interface <span class="strong">LifecycleController</span></pre> |
| <div class="block">Injects a <code>Runnable</code> object in a Service for starting/stopping it programatically. |
| By default, a Service is implicitly started when the service's bundle is started and when |
| all required dependencies are satisfied. However, it is sometimes required to programatically |
| take control of when the service is started or stopped. In this case, the injected <code>Runnable</code> |
| can be invoked in order to start/register (or stop/unregister) a Service at any time. When this annotation |
| is used, then the Service on which this annotation is applied is not activated by default, and you have to |
| call the injected Runnable yourself. |
| <p> |
| <h3>Usage Examples</h3> |
| <blockquote> |
| |
| <pre> |
| /** |
| * This Service will be registered programatically into the OSGi registry, using the LifecycleController annotation. |
| */ |
| @Service |
| class X implements Z { |
| @LifecycleController |
| Runnable starter |
| |
| @LifecycleController(start=false) |
| Runnable stopper |
| |
| @Init |
| void init() { |
| // At this point, all required dependencies are there, but we'll activate our service in 2 seconds ... |
| Thread t = new Thread() { |
| public void run() { |
| sleep(2000); |
| // start our "Z" service (our "start" method will be called, juste before service registration |
| starter.run(); |
| |
| sleep(2000); |
| // now, stop/unregister the "Z" service (we'll then be called in our stop() method |
| stopper.run(); |
| } |
| }; |
| t.start(); |
| } |
| |
| @Start |
| public void start() { |
| // This method will be called after we invoke our starter Runnable, and our service will be |
| // published after our method returns, as in normal case. |
| } |
| |
| @Stop |
| public void stop() { |
| // This method will be called after we invoke our "stop" Runnable, and our service will be |
| // unregistered before our method is invoked, as in normal case. Notice that the service won't |
| // be destroyed here, and the "starter" runnable can be re-invoked later. |
| } |
| } |
| </pre> |
| </blockquote></div> |
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| <h3>Optional Element Summary</h3> |
| <table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Optional Element Summary table, listing optional elements, and an explanation"> |
| <caption><span>Optional Elements</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Optional Element and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/felix/dm/annotation/api/LifecycleController.html#start()">start</a></strong></code> |
| <div class="block">Specifies the action to be performed when the Injected runnable is invoked.</div> |
| </td> |
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| <!-- ============ ANNOTATION TYPE MEMBER DETAIL =========== --> |
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| <h3>Element Detail</h3> |
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| <h4>start</h4> |
| <pre>public abstract boolean start</pre> |
| <div class="block">Specifies the action to be performed when the Injected runnable is invoked. By default, the |
| Runnable will fire a Service Component activation, when invoked. If you specify this attribute |
| to false, then the Service Component will be stopped, when the runnable is invoked.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>true</dd> |
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