documentation/_attachments/apidocs/dependencymanager.annotations/r15/org/apache/felix/dm/annotation/api/LifecycleController.html - felix-site-pub - Git at Google

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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="memberNameLabel">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.

  <h3>Usage Examples</h3>
  <blockquote>

  <pre>
  &#47;**
    * This Service will be registered programmatically into the OSGi registry, using the LifecycleController annotation.
    *&#47;
  &#64;Component
  class X implements Z {
      &#64;LifecycleController
      Runnable starter

      &#64;LifecycleController(start=false)
      Runnable stopper

      &#64;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();
      }

      &#64;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.
      }

      &#64;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>
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 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Optional Element and Description</th>
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 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/felix/dm/annotation/api/LifecycleController.html#start--">start</a></span></code>
 <div class="block">Specifies the action to be performed when the injected runnable is invoked.</div>
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 <pre>public abstract&nbsp;boolean&nbsp;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><span class="returnLabel">Returns:</span></dt>
 <dd>true if the component must be started when you invoke the injected runnable, or false if
  the component must stopped when invoking the runnable.</dd>
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 <dt>Default:</dt>
 <dd>true</dd>
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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="memberNameLabel">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.

	<h3>Usage Examples</h3>
	<blockquote>

	<pre>
	/**
	* This Service will be registered programmatically into the OSGi registry, using the LifecycleController annotation.
	*/
	@Component
	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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	<caption><span>Optional Elements</span><span class="tabEnd"> </span></caption>
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	<th class="colFirst" scope="col">Modifier and Type</th>
	<th class="colLast" scope="col">Optional Element and Description</th>
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	<td class="colFirst"><code>boolean</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/felix/dm/annotation/api/LifecycleController.html#start--">start</a></span></code>
	<div class="block">Specifies the action to be performed when the injected runnable is invoked.</div>
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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><span class="returnLabel">Returns:</span></dt>
	<dd>true if the component must be started when you invoke the injected runnable, or false if
	the component must stopped when invoking the runnable.</dd>
	</dl>
	<dl>
	<dt>Default:</dt>
	<dd>true</dd>
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