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| <h1 id="using-distributed-services-with-ipojo">Using Distributed Services with iPOJO<a class="headerlink" href="#using-distributed-services-with-ipojo" title="Permanent link">¶</a></h1> |
| <p><em>Distributed Service defines how to deal with remote services in OSGi. This page describes the CXF Distributed OSGi with iPOJO demo.This demo uses iPOJO to create a remote OSGi service from an iPOJO component. The consumer side also uses iPOJO to create a component that consumes the remote OSGi service. By using iPOJO, you don't need to write code to interact with the OSGi Service Registry at all. That's all handled through injection, which hugely simplifies the code. Moreover thanks to iPOJO's advanced features such as property propagation, the service is exported without any impact on its implementation.</em></p> |
| <p>In this demo, you will show how to use iPOJO:</p> |
| <ul> |
| <li>to expose a service </li> |
| <li>to propagate properties to make the service remotely accessible</li> |
| <li>to use a "remote" service</li> |
| </ul> |
| <p>This demo can be used with any DOSGi distribution, in this document the single-bundle distribution (1.1) is used with iPOJO 1.6.0 and Felix (2.0.5)</p> |
| <div class="toc"> |
| <ul> |
| <li><a href="#using-distributed-services-with-ipojo">Using Distributed Services with iPOJO</a><ul> |
| <li><a href="#demo-design">Demo design</a></li> |
| <li><a href="#sources">Sources</a></li> |
| <li><a href="#the-adder-service-implementation">The Adder Service Implementation</a></li> |
| <li><a href="#the-adder-service-consumer">The Adder Service Consumer</a></li> |
| <li><a href="#conclusion">Conclusion</a></li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <h2 id="demo-design">Demo design<a class="headerlink" href="#demo-design" title="Permanent link">¶</a></h2> |
| <p>This demo is quite similar to the DS demo of DOSGi demo in structure. It consists of 5 bundles:</p> |
| <ul> |
| <li>An interface bundle defining the Adder Service interface. </li> |
| <li>This bundle is deployed on both sides.</li> |
| <li>An Adder Service implementation bundle. (The service will be exported)</li> |
| <li>An Adder Service importer bundle containing the remote-service file explaining to DOSGi how to import and from where to import the Adder service.</li> |
| <li>An Adder Service consumer bundle.</li> |
| </ul> |
| <p><img src="design.png"></p> |
| <p>The service implementation and consumer bundle are built using iPOJO. |
| The Adder Service interface is as follows:</p> |
| <div class="codehilite"><pre><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">AdderService</span> <span class="o">{</span> |
| <span class="kt">int</span> <span class="nf">add</span><span class="o">(</span><span class="kt">int</span> <span class="n">a</span><span class="o">,</span><span class="kt">int</span> <span class="n">b</span><span class="o">);</span> |
| <span class="o">}</span> |
| </pre></div> |
| |
| |
| <h2 id="sources">Sources<a class="headerlink" href="#sources" title="Permanent link">¶</a></h2> |
| <p>The sources and a pre-configured version of Felix are available in the <a href="http://people.apache.org/~clement/ipojo/tutorials/dosgi/dosgi-tutorial.zip">dosgi-tutorial archive</a>. Once downloaded unzip the archive. To compile, run from the root : <code>mvn clean install</code>. To run the application. go to the <code>felix</code> directory containing a pre-configured Felix.</p> |
| <h2 id="the-adder-service-implementation">The Adder Service Implementation<a class="headerlink" href="#the-adder-service-implementation" title="Permanent link">¶</a></h2> |
| <p>The service implementation is a simplistic implementation of the Adder service, which is instantiated as an iPOJO component. This implementation uses annotations to define its component type. The <code>@provides</code> annotation just says that it provides a service. Moreover, the <code>propagation=true</code> attribute enables property propagation.</p> |
| <p>In the <a href="http://svn.apache.org/repos/asf/felix/sandbox/clement/ipojo-tutorials/dosgi/AdderServiceProvider/src/main/resources/metadata.xml">metadata.xml</a> file, an instance of the component type is declared. Note that this instance declaration defines three properties used by DOSGi to exports the service. These properties instruct Distributed OSGi into making the service available on http://localhost:9090/adder. Those properties are not declared in the component type itself. Indeed, the component type enables property propagation; so all defined properties will be published on exported services. This propagation also works with the configuration admin. This feature is pretty nice, as it does not impact the component implementation and its description.</p> |
| <div class="codehilite"><pre><span class="nt"><instance</span> <span class="na">component=</span><span class="s">"org.apache.felix.ipojo.remote.adder.impl.AdderServiceImpl"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"osgi.remote.interfaces"</span><span class="na">value=</span><span class="s">"*"</span><span class="nt">/></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"osgi.remote.configuration.type"</span><span class="na">value=</span><span class="s">"pojo"</span><span class="nt">/></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"osgi.remote.configuration.pojo.address"</span><span class="na">value=</span><span class="s">"http://localhost:9090/adder"</span><span class="nt">/></span> |
| <span class="nt"></instance></span> |
| </pre></div> |
| |
| |
| <p>So let's install the server side in Felix. Launch Felix from the <code>felix</code> directory with:</p> |
| <div class="codehilite"><pre>java -jar bin/felix.jar server |
| </pre></div> |
| |
| |
| <p>Once the shell prompt appears, execute the following command in the shell:</p> |
| <div class="codehilite"><pre>start file:../AdderServiceInterface/target/AdderServiceInterface-0.0.1-SNAPSHOT.jar |
| start file:../AdderServiceProvider/target/AdderServiceProvider-0.0.1-SNAPSHOT.jar |
| </pre></div> |
| |
| |
| <p>At this point, the service should be available remotely (wait until the console stops printing stuff), you can check this by obtaining the WSDL: <a href="http://localhost:9090/adder?wsdl">http://localhost:9090/adder?wsdl</a></p> |
| <p><img src="wsdl.png" width="600px"></p> |
| <h2 id="the-adder-service-consumer">The Adder Service Consumer<a class="headerlink" href="#the-adder-service-consumer" title="Permanent link">¶</a></h2> |
| <p>The service consumer is also created using iPOJO. Thanks to DOSGi, iPOJO can inject the service as any regular OSGi service. So, the code is pretty simple:</p> |
| <div class="codehilite"><pre><span class="nd">@Component</span> |
| <span class="kd">public</span> <span class="kd">class</span> <span class="nc">AdderConsumer</span> <span class="o">{</span> |
| |
| <span class="nd">@Requires</span> |
| <span class="kd">private</span> <span class="n">AdderService</span> <span class="n">adder</span><span class="o">;</span> |
| |
| <span class="kd">public</span> <span class="nf">AdderConsumer</span><span class="o">()</span> <span class="o">{</span> |
| <span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">"Using adder service: 1 + 1 = "</span><span class="o">+</span> <span class="n">adder</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="mi">1</span><span class="o">));</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| </pre></div> |
| |
| |
| <p>This implementation use iPOJO field injection to receive the AdderService. Then, it uses it as a regular field. This bundle also contains a [metadata.xml|http://svn.apache.org/repos/asf/felix/sandbox/clement/ipojo-tutorials/dosgi/AdderServiceConsumer/src/main/resources/metadata.xml] file declaring an instance of this type without any special configuration:</p> |
| <div class="codehilite"><pre><span class="nt"><instance</span> <span class="na">component=</span><span class="s">"org.apache.felix.ipojo.remote.consumer.AdderConsumer"</span><span class="nt">/></span> |
| </pre></div> |
| |
| |
| <p>However, now we have to tell to DOSGi to import our Adder service. To achieve that, we create a very simple bundle that just contains the <a href="http://svn.apache.org/repos/asf/felix/sandbox/clement/ipojo-tutorials/dosgi/AdderServiceImporter/src/main/resources/OSGI-INF/remote-service/remote-services.xml">remote-services.xml</a> file. This file is analyzed by CXF in order to import the service.</p> |
| <div class="codehilite"><pre><span class="nt"><service-descriptions</span> <span class="na">xmlns=</span><span class="s">"http://www.osgi.org/xmlns/sd/v1.0.0"</span><span class="nt">></span> |
| <span class="nt"><service-description></span> |
| <span class="nt"><provide</span> <span class="na">interface=</span><span class="s">"org.apache.cxf.dosgi.samples.ds.AdderService"</span><span class="nt">/></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"osgi.remote.interfaces"</span><span class="nt">></span>*<span class="nt"></property></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"osgi.remote.configuration.type"</span><span class="nt">></span>pojo<span class="nt"></property></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"osgi.remote.configuration.pojo.address"</span><span class="nt">></span>http://localhost:9090/adder<span class="nt"></property></span> |
| <span class="nt"></service-description></span> |
| <span class="nt"></service-descriptions></span> |
| </pre></div> |
| |
| |
| <p>Now, let's start another instance of Felix:</p> |
| <div class="codehilite"><pre>java -jar bin/felix.jar client |
| </pre></div> |
| |
| |
| <p>Then, execute the following command in the shell:</p> |
| <div class="codehilite"><pre>start file:../AdderServiceInterface/target/AdderServiceInterface-0.0.1-SNAPSHOT.jar |
| start file:../AdderServiceConsumer/target/AdderServiceConsumer-0.0.1-SNAPSHOT.jar |
| start file:../AdderServiceImporter/target/AdderServiceImporter-0.0.1-SNAPSHOT.jar |
| |
| ... log messages may appear, after a little <span class="k">while </span>the following message appears: |
| |
| Using adder service: 1 + <span class="nv">1</span> <span class="o">=</span> 2 |
| </pre></div> |
| |
| |
| <p>The remote adder service has now been invoked. You will see the following line on the server side window:</p> |
| <div class="codehilite"><pre>Adder service invoked: 1 + <span class="nv">1</span> <span class="o">=</span> 2 |
| </pre></div> |
| |
| |
| <p>That's it !</p> |
| <h2 id="conclusion">Conclusion<a class="headerlink" href="#conclusion" title="Permanent link">¶</a></h2> |
| <p>This tutorial has illustrated how to easily create remote services and consume them with iPOJO. Subscribe to the Felix users mailing list by sending a message to <a href="mailto:users-subscribe@felix.apache.org">users-subscribe@felix.apache.org</a>; after subscribing, email questions or feedback to <a href="mailto:users@felix.apache.org">users@felix.apache.org</a>.</p> |
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| Rev. 1700393 by cziegeler on Tue, 1 Sep 2015 06:04:06 +0000 |
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