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| <h1 id="the-white-board-pattern-handler">The white board pattern handler<a class="headerlink" href="#the-white-board-pattern-handler" title="Permanent link">¶</a></h1> |
| <p>The objective of this handler is to simplify the development of white-board architecture. This architecture-style is based is very close to the extender architecture style but relies on services instead of bundles.</p> |
| <div class="toc"> |
| <ul> |
| <li><a href="#the-white-board-pattern-handler">The white board pattern handler</a><ul> |
| <li><a href="#the-whiteboard-pattern">The whiteboard pattern</a></li> |
| <li><a href="#using-the-handler">Using the handler</a></li> |
| <li><a href="#configuration">Configuration</a></li> |
| <li><a href="#configuring-the-handler-with-annotations">Configuring the handler with annotations</a></li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="alert alert-info info" markdown="1"> |
| <h4>Change in the 1.2.0</h4> |
| <p>The 1.2.0 uses the namespace <code>org.apache.felix.ipojo.whiteboard</code> instead of <code>org.apache.felix.ipojo.white-board-pattern</code></p> |
| </div> |
| |
| <div class="alert alert-info info" markdown="1"> |
| <h4>Change in the 1.7.0</h4> |
| <p>The 1.7.0 has introduced a new annotations allowing to declare several whiteboard patterns in the same class. The <code>@Whiteboards</code> annotation is not available in previous version.</p> |
| </div> |
| |
| <h2 id="the-whiteboard-pattern">The whiteboard pattern<a class="headerlink" href="#the-whiteboard-pattern" title="Permanent link">¶</a></h2> |
| <p>A whiteboard is based on two different roles:</p> |
| <ul> |
| <li>A consumer looking to special services or a services published with a special mark</li> |
| <li>Looked services</li> |
| </ul> |
| <p>More information on this pattern is available in this <a href="http://www.osgi.org/wiki/uploads/Links/whiteboard.pdf">document</a> |
| Implementing a white board pattern could be complex as the extender needs to track these services dynamically. Indeed looked services can be highly dynamic; they can arrive, leave or be modified at runtime. Several services specified in the OSGi specification use white board pattern such as the Device Access Manager.</p> |
| <h2 id="using-the-handler">Using the handler<a class="headerlink" href="#using-the-handler" title="Permanent link">¶</a></h2> |
| <p>First of all, you need to configure the component type to use the handler such as:</p> |
| <div class="codehilite"><pre><span class="nt"><ipojo</span> <span class="na">xmlns:wbp=</span><span class="s">"org.apache.felix.ipojo.whiteboard"</span><span class="nt">></span> |
| <span class="nt"><component</span> |
| <span class="na">className=</span><span class="s">"org.apache.felix.ipojo.test.FooWhiteBoardPattern"</span><span class="nt">></span> |
| <span class="nt"><wbp:wbp</span> |
| <span class="na">filter=</span><span class="s">"(my.property=1)"</span> |
| <span class="na">onArrival=</span><span class="s">"onArrival"</span> |
| <span class="na">onDeparture=</span><span class="s">"onDeparture"</span> |
| <span class="na">onModification=</span><span class="s">"onModification"</span> |
| <span class="nt">/></span> |
| <span class="nt"></component></span> |
| </pre></div> |
| |
| |
| <p>Notice that, this handler is an external handler. So, it uses the "org.apache.felix.ipojo.whiteboard" namespace. |
| Once described, you can implement your component. The methods specified methods will be called when a matching services arrives or leaves or are modified.The modification callback is optional. A matching service is detected by confronting the service reference against the specified filter. |
| The filter can target specific service interface (with the objectclass property) or property values. |
| In the previous example, these methods could be: </p> |
| <div class="codehilite"><pre><span class="kd">public</span> <span class="kd">class</span> <span class="nc">FooWhiteBoardPattern</span> <span class="o">{</span> |
| <span class="n">List</span> <span class="n">list</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">();</span> |
| <span class="kt">int</span> <span class="n">modifications</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span> |
| <span class="kd">public</span> <span class="kd">synchronized</span> <span class="kt">void</span> <span class="nf">onArrival</span><span class="o">(</span><span class="n">ServiceReference</span> <span class="n">ref</span><span class="o">)</span> <span class="o">{</span> |
| <span class="n">list</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">ref</span><span class="o">);</span> |
| <span class="o">}</span> |
| <span class="kd">public</span> <span class="kd">synchronized</span> <span class="kt">void</span> <span class="nf">onDeparture</span><span class="o">(</span><span class="n">ServiceReference</span> <span class="n">ref</span><span class="o">)</span> <span class="o">{</span> |
| <span class="n">list</span><span class="o">.</span><span class="na">remove</span><span class="o">(</span><span class="n">ref</span><span class="o">);</span> |
| <span class="o">}</span> |
| <span class="kd">public</span> <span class="kd">synchronized</span> <span class="kt">void</span> <span class="nf">onModification</span><span class="o">(</span><span class="n">ServiceReference</span> <span class="n">ref</span><span class="o">)</span> <span class="o">{</span> |
| <span class="c1">// ...</span> |
| <span class="o">}</span> |
| </pre></div> |
| |
| |
| <p>All methods received the arriving, leaving or modified service reference.</p> |
| <p>You can also use annotation to declare the same component:</p> |
| <div class="codehilite"><pre><span class="nd">@Component</span> |
| <span class="nd">@Wbp</span><span class="o">(</span> |
| <span class="n">filter</span><span class="o">=</span><span class="s">"my.property=1"</span><span class="o">,</span> |
| <span class="n">onArrival</span><span class="o">=</span><span class="s">"onArrival"</span> |
| <span class="n">onDeparture</span><span class="o">=</span><span class="s">"onDeparture"</span> |
| <span class="n">onModification</span><span class="o">=</span><span class="s">"onModification"</span><span class="o">)</span> |
| <span class="kd">public</span> <span class="kd">class</span> <span class="nc">FooWhiteBoardPattern</span> <span class="o">{</span> |
| <span class="n">List</span> <span class="n">list</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">();</span> |
| |
| <span class="kd">public</span> <span class="kd">synchronized</span> <span class="kt">void</span> <span class="nf">onArrival</span><span class="o">(</span><span class="n">ServiceReference</span> <span class="n">ref</span><span class="o">)</span> <span class="o">{</span> |
| <span class="n">list</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">ref</span><span class="o">);</span> |
| <span class="o">}</span> |
| <span class="kd">public</span> <span class="kd">synchronized</span> <span class="kt">void</span> <span class="nf">onDeparture</span><span class="o">(</span><span class="n">ServiceReference</span> <span class="n">ref</span><span class="o">)</span> <span class="o">{</span> |
| <span class="n">list</span><span class="o">.</span><span class="na">remove</span><span class="o">(</span><span class="n">ref</span><span class="o">);</span> |
| <span class="o">}</span> |
| <span class="kd">public</span> <span class="kd">synchronized</span> <span class="kt">void</span> <span class="nf">onModification</span><span class="o">(</span><span class="n">ServiceReference</span> <span class="n">ref</span><span class="o">)</span> <span class="o">{</span> |
| <span class="c1">//...</span> |
| <span class="o">}</span> |
| </pre></div> |
| |
| |
| <h2 id="configuration">Configuration<a class="headerlink" href="#configuration" title="Permanent link">¶</a></h2> |
| <p>The handler has only three mandatory attributes:</p> |
| <ul> |
| <li>Filter: filter use to discover matching filter.</li> |
| <li>onArrival: declaring the method to invoke when a matching service arrives</li> |
| <li>onDeparture: declaring the method to invoke when a matching service leaves</li> |
| </ul> |
| <p>The onModification attribute is optional. This method is called when an injected service reference is modified but stills valid against the filter.</p> |
| <div class="alert alert-info info" markdown="1"> |
| <h4>Notifications</h4> |
| The implementation will be notified of arrivals, modifications and departures, despite the instance is invalid. Indeed, the implementation must release all objects created from another bundle as soon it leaves. |
| </div> |
| |
| <h2 id="configuring-the-handler-with-annotations">Configuring the handler with annotations<a class="headerlink" href="#configuring-the-handler-with-annotations" title="Permanent link">¶</a></h2> |
| <p>It is possible to configure the handler with a simple annotation available in the annotation pack ('annotation' project in the iPOJO trunk). Here is an example of usage:</p> |
| <div class="codehilite"><pre><span class="kn">import</span> <span class="nn">org.apache.felix.ipojo.annotations.Component</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.osgi.framework.ServiceReference</span><span class="o">;</span> |
| |
| <span class="nd">@Component</span> |
| <span class="nd">@org.apache.felix.ipojo.whiteboard.Wbp</span><span class="o">(</span><span class="n">filter</span><span class="o">=</span><span class="s">"(foo=true)"</span><span class="o">,</span> |
| <span class="n">onArrival</span><span class="o">=</span><span class="s">"onArrival"</span><span class="o">,</span> |
| <span class="n">onDeparture</span><span class="o">=</span><span class="s">"onDeparture"</span><span class="o">,</span> |
| <span class="n">onModification</span><span class="o">=</span><span class="s">"onModification"</span><span class="o">)</span> |
| <span class="kd">public</span> <span class="kd">class</span> <span class="nc">WhiteBoardExemple</span> <span class="o">{</span> |
| |
| <span class="kd">public</span> <span class="kt">void</span> <span class="nf">onArrival</span><span class="o">(</span><span class="n">ServiceReference</span> <span class="n">ref</span><span class="o">)</span> <span class="o">{</span> |
| <span class="c1">// do something</span> |
| <span class="o">}</span> |
| |
| <span class="kd">public</span> <span class="kt">void</span> <span class="nf">onDeparture</span><span class="o">(</span><span class="n">ServiceReference</span> <span class="n">ref</span><span class="o">)</span> <span class="o">{</span> |
| <span class="c1">// do something</span> |
| <span class="o">}</span> |
| |
| <span class="kd">public</span> <span class="kt">void</span> <span class="nf">onModification</span><span class="o">(</span><span class="n">ServiceReference</span> <span class="n">ref</span><span class="o">)</span> <span class="o">{</span> |
| <span class="c1">// do something</span> |
| <span class="o">}</span> |
| |
| <span class="o">}</span> |
| </pre></div> |
| |
| |
| <p>The <code>onModification</code> attribute is optional.The <code>filter</code> attribute allows setting the service filter.</p> |
| <p>In the 1.7.0, a new annotation was introduced to support the declaration of several whiteboard patterns in the same component:</p> |
| <div class="codehilite"><pre><span class="nd">@Component</span> |
| <span class="nd">@Whiteboards</span><span class="o">(</span><span class="n">whiteboards</span><span class="o">={</span> |
| <span class="nd">@Wbp</span><span class="o">(</span><span class="n">filter</span><span class="o">=</span><span class="s">"(foo=true)"</span><span class="o">,</span> |
| <span class="n">onArrival</span><span class="o">=</span><span class="s">"onArrival"</span><span class="o">,</span> |
| <span class="n">onDeparture</span><span class="o">=</span><span class="s">"onDeparture"</span><span class="o">,</span> |
| <span class="n">onModification</span><span class="o">=</span><span class="s">"onModification"</span><span class="o">),</span> |
| <span class="nd">@Wbp</span><span class="o">(</span><span class="n">filter</span><span class="o">=</span><span class="s">"(bar=true)"</span><span class="o">,</span> |
| <span class="n">onArrival</span><span class="o">=</span><span class="s">"onArrival2"</span><span class="o">,</span> |
| <span class="n">onDeparture</span><span class="o">=</span><span class="s">"onDeparture2"</span><span class="o">)}</span> |
| <span class="o">)</span> |
| <span class="kd">public</span> <span class="kd">class</span> <span class="nc">WhiteBoardExemple</span> <span class="o">{</span> |
| |
| <span class="c1">// ...</span> |
| |
| <span class="o">}</span> |
| </pre></div> |
| </div> |
| </div> |
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