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| <h1 id="configuring-ipojo-extender">Configuring iPOJO Extender<a class="headerlink" href="#configuring-ipojo-extender" title="Permanent link">¶</a></h1> |
| <p><em>This page presents how the iPOJO's extender can be configured.</em></p> |
| <div class="toc"> |
| <ul> |
| <li><a href="#configuring-ipojo-extender">Configuring iPOJO Extender</a><ul> |
| <li><a href="#extender">Extender</a><ul> |
| <li><a href="#threadpool">ThreadPool</a></li> |
| <li><a href="#synchronous-asynchronous-processing">Synchronous / Asynchronous processing</a><ul> |
| <li><a href="#system-wide">System wide</a></li> |
| <li><a href="#per-bundle">Per-Bundle</a></li> |
| </ul> |
| </li> |
| <li><a href="#queueservice-insights">QueueService Insights</a></li> |
| <li><a href="#event-dispatcher">Event Dispatcher</a></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <h2 id="extender">Extender<a class="headerlink" href="#extender" title="Permanent link">¶</a></h2> |
| <p>The iPOJO Extender starts with the iPOJO bundle (in fact, it's the iPOJO's <code>BundleActivator</code>). It is basically a <code>BundleTracker</code> that will discover iPOJO's components, instances, etc from the <code>ACTIVE</code> bundles.</p> |
| <h3 id="threadpool">ThreadPool<a class="headerlink" href="#threadpool" title="Permanent link">¶</a></h3> |
| <p>In Apache Felix iPOJO 1.10, the extender has been refactored to take advantage of multi-threading capabilities of modern machines. |
| There is now an <code>ExecutorQueueService</code> service, based on a <code>ThreadPoolExecutor</code> that enable asynchronous (and concurrent) activation of Bundles. |
| All activation activities (search for <code>IPOJO-Components</code> and <code>IPOJO-Extensions</code> Manifest headers, creation of factories and instances, binding) are done through job submissions. |
| Respectively, deactivation is always done asynchronously (if bundle is stopped when we would perform actions on it, that the ideal way to Exceptions).</p> |
| <p>By default, the ThreadPool size is set to <em>1</em> (asynchronous, but not concurrent executions), to mimic the pre 1.10 behavior.</p> |
| <p>ThreadPool's size can be configured either with System properties or through ConfigurationAdmin. |
| With Config Admin, the Configuration object has to target the service with <code>org.apache.felix.ipojo.extender.ExecutorQueueService</code> as its Service PID. |
| Property names are identical for System properties and ConfigAdmin.</p> |
| <table class="table table-striped"> |
| <thead> |
| <tr> |
| <th>Function</th> |
| <th>Property Name</th> |
| <th>Supported Type(s)</th> |
| <th>Default Value</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>Number of Threads</td> |
| <td><code>org.apache.felix.ipojo.extender.ThreadPoolSize</code></td> |
| <td>Integer</td> |
| <td><code>1</code></td> |
| <td>The size of the thread pool. The default value is 1. Increase in case of a large amount of bundle's to manage (bundles with iPOJO's components/instances inside).</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h3 id="synchronous-asynchronous-processing">Synchronous / Asynchronous processing<a class="headerlink" href="#synchronous-asynchronous-processing" title="Permanent link">¶</a></h3> |
| <p>By default, Apache Felix iPOJO process the Bundles in an asynchronous way. It's better in term of performances and more aligned with OSGi spec recommendations. |
| However, in some situations, like when running in <a href="https://developers.google.com/appengine/">Google App Engine</a> (<em>GAE</em>), the underlying platform imposes limitations. |
| For example GAE imposes mono-threading. That means that no asynchronous processing can be done by the application itself.</p> |
| <p>In other situations, it can be useful to be sure that components and instances contained in a given Bundle will be synchronously started.</p> |
| <p>iPOJO's Extender can be configured to support mono-threaded bundle processing to support such use cases.</p> |
| <h4 id="system-wide">System wide<a class="headerlink" href="#system-wide" title="Permanent link">¶</a></h4> |
| <p>General synchronous processing can be configured through System properties or iPOJO's own Manifest attributes (requires a dedicated iPOJO bundle build).</p> |
| <table class="table table-striped"> |
| <thead> |
| <tr> |
| <th>Mean</th> |
| <th>Property Name</th> |
| <th>Supported Type(s)</th> |
| <th>Default Value</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>System Property</td> |
| <td><code>ipojo.processing.synchronous</code></td> |
| <td>Boolean</td> |
| <td><code>false</code></td> |
| <td>Whether the Bundles processing should be performed synchronously. The default value is <code>false</code>. Set it to <code>true</code> when running in GAE for example.</td> |
| </tr> |
| <tr> |
| <td>Manifest</td> |
| <td><code>IPojo-processing-synchronous</code></td> |
| <td>Boolean</td> |
| <td><code>false</code></td> |
| <td>Whether the Bundles processing should be performed synchronously. The default value is <code>false</code>. Set it to <code>true</code> when running in GAE for example. Notice that case is ignored (<code>IPOJO-PROCESSING-SYNCHRONOUS</code> works as well as <code>IPojo-Processing-Synchronous</code>).</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h4 id="per-bundle">Per-Bundle<a class="headerlink" href="#per-bundle" title="Permanent link">¶</a></h4> |
| <p>The synchronous behavior can be selected per-bundle (given that it does not conflict with existing system wide configuration). |
| Synchronous/Asynchronous behavior can be expressed in the Bundle's Manifest (case is not significant, but an uppercase first letter is recommended):</p> |
| <div class="codehilite"><pre><span class="n">IPOJO</span><span class="o">-</span><span class="n">Queue</span><span class="o">-</span><span class="n">Preference</span> <span class="n">SYNC</span> |
| </pre></div> |
| |
| |
| <p>3 values are supported:</p> |
| <ul> |
| <li><code>SYNC</code> for synchronous processing</li> |
| <li><code>ASYNC</code> for asynchronous processing</li> |
| <li><code>DEFAULT</code> using the default behavior</li> |
| </ul> |
| <p>If no header (or invalid value) is provided, the fallback behavior is <code>DEFAULT</code> (use system wide preference).</p> |
| <h3 id="queueservice-insights">QueueService Insights<a class="headerlink" href="#queueservice-insights" title="Permanent link">¶</a></h3> |
| <p>Apache Felix iPOJO provides a mechanism that stores Job events of the QueueService in use (synchronous, multi-threaded, ...) for replay. |
| This is very useful to see where time is spent during the bootstrap and take actions accordingly.</p> |
| <p>This mechanism is available when the <code>org.apache.felix.ipojo.extender.BootstrapQueueDebug</code> system property is set to <code>true</code>. |
| When activated, a new OSGi service is registered under the <code>org.apache.felix.ipojo.extender.queue.debug.QueueEventProxy</code> interface (see below).</p> |
| <p><code>QueueListener</code> has to be registered in this service, when added, they'll be invoked with all stored events. |
| After that, the proxy simply forward the queue events to registered listeners.</p> |
| <div class="codehilite"><pre><span class="cm">/**</span> |
| <span class="cm"> * This service record events from a {@link org.apache.felix.ipojo.extender.queue.QueueService}.</span> |
| <span class="cm"> * When a listener is added, all recorded events are replayed into the listener.</span> |
| <span class="cm"> */</span> |
| <span class="kd">public</span> <span class="kd">interface</span> <span class="nc">QueueEventProxy</span> <span class="o">{</span> |
| <span class="cm">/**</span> |
| <span class="cm"> * Add a {@link org.apache.felix.ipojo.extender.queue.QueueListener} that will be notified on events</span> |
| <span class="cm"> * relative to the observed {@link org.apache.felix.ipojo.extender.queue.QueueService}.</span> |
| <span class="cm"> * @param listener added listener</span> |
| <span class="cm"> */</span> |
| <span class="kt">void</span> <span class="nf">addQueueListener</span><span class="o">(</span><span class="n">QueueListener</span> <span class="n">listener</span><span class="o">);</span> |
| |
| <span class="cm">/**</span> |
| <span class="cm"> * Remove a {@link QueueListener} from the observed {@link org.apache.felix.ipojo.extender.queue.QueueService}.</span> |
| <span class="cm"> * @param listener removed listener</span> |
| <span class="cm"> */</span> |
| <span class="kt">void</span> <span class="nf">removeQueueListener</span><span class="o">(</span><span class="n">QueueListener</span> <span class="n">listener</span><span class="o">);</span> |
| <span class="o">}</span> |
| </pre></div> |
| |
| |
| <h3 id="event-dispatcher">Event Dispatcher<a class="headerlink" href="#event-dispatcher" title="Permanent link">¶</a></h3> |
| <p>Apache Felix iPOJO provides a way to circumvent the so-call event storm happening when starting large OSGi applications (chained services apparitions). |
| It is a dedicated Event dispatcher that mimics a service registry partition logic based on registered service interfaces (<code>Constants.OBJECTCLASS</code>). |
| It is not enabled by default (rely on the framework's own service registry).</p> |
| <table class="table table-striped"> |
| <thead> |
| <tr> |
| <th>Mean</th> |
| <th>Property Name</th> |
| <th>Supported Type(s)</th> |
| <th>Default Value</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>System Property</td> |
| <td><code>ipojo.internal.dispatcher</code></td> |
| <td>Boolean</td> |
| <td><code>false</code></td> |
| <td>Whether the EventDispatcher should be enabled. The default value is <code>false</code>. Set it to <code>true</code> when running large-scale applications.</td> |
| </tr> |
| <tr> |
| <td>Manifest</td> |
| <td><code>IPOJO-Internal-Dispatcher</code></td> |
| <td>Boolean</td> |
| <td><code>false</code></td> |
| <td>Whether the EventDispatcher should be enabled. The default value is <code>false</code>. Set it to <code>true</code> when running large-scale applications. Notice that case is ignored (<code>IPOJO-INTERNAL-DISPATCHER</code> works as well as <code>IPOJO-Internal-Dispatcher</code>).</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
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| <div class="timestamp span3 offset2"> |
| Rev. 1530248 by clement on Tue, 8 Oct 2013 12:13:27 +0000 |
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