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| <h1 class="page">Apache Felix SCR Annotations BndTools Use</h1> |
| <div class="sect1"> |
| <h2 id="_using_the_apache_felix_scr_annotations_bnd_plugin_to_generate_declarative_services_and_metatype_service_descriptors_in_bndtools"><a class="anchor" href="#_using_the_apache_felix_scr_annotations_bnd_plugin_to_generate_declarative_services_and_metatype_service_descriptors_in_bndtools"></a>Using the Apache Felix SCR Annotations Bnd plugin to generate Declarative Services and Metatype Service descriptors in BndTools.</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The org.apache.felix.scrplugin.bnd.SCRDescriptorBndPlugin is a bnd plugin allowing to generate SCR annotations and metatype descriptors in the Eclipse BndTools environment. |
| This page describes how to install the plugin in BndTools and also provides a simple tutorial, which won’t be very fascinating, but will make it easy to demonstrate the use of Apache SCR annotations within BndTools.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If you are not yet familiar with BndTools or if you have not already installed it, you can take a look at <a href="http://bndtools.org/">BndTools homepage</a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This tutorial has been made with Eclipse Kepler and with the latest BndTools development version. |
| It is assumed that the eclipse workspace is currently set to ~/workspace/BNDTOOLS</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_installing_scr_bnd_plugin_in_bndtools"><a class="anchor" href="#_installing_scr_bnd_plugin_in_bndtools"></a>Installing SCR Bnd plugin in BndTools</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>Create the cnf project</strong>:</p> |
| </div> |
| <div class="paragraph"> |
| <p>If the BndTools "cnf" project does not already exist in your workspace, then create it:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>In the Eclipse Windows menu, click on Preference -> BndTools OSGi</p> |
| </li> |
| <li> |
| <p>Click on "Configuration Project/Check Now". |
| This will create the "cnf" bndtools project.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p><strong>Compile the SCR annotations bnd plugin and copy it in cnf project</strong>:</p> |
| </div> |
| <div class="paragraph"> |
| <p>Now you have to copy the SCR annotations bnd plugin into the cnf project of your current workspace ("BNDTOOLS" in this example). |
| For now, the plugin is not yet released, but you can build it yourself like this:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-sh hljs" data-lang="sh"> $ svn checkout http://svn.apache.org/repos/asf/felix/trunk/scrplugin scrplugin |
| $ cd scrplugin |
| $ mvn clean install |
| $ mkdir ~/workspace/BNDTOOLS/cnf/plugins/org.apache.felix.scr.bnd/ |
| $ cp scrplugin/bnd-scr-plugin/target/org.apache.felix.scr.bnd-X.Y.Z-SNAPSHOT.jar ~/workspace/BNDTOOLS/cnf/plugins/org.apache.felix.scr.bnd/</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p><strong>Configure the default BndTools plugin path</strong>:</p> |
| </div> |
| <div class="paragraph"> |
| <p>In order to let BndTools load the SCR annotations bnd plugin, you can configure the default BndTools plugin path:</p> |
| </div> |
| <div class="paragraph"> |
| <p>First, if you have not yet opened the BndTools perspective, then open it: go to Window Menu -> Open Perspective -> BndTools.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Now, in BndTools menu, click on "BndTools Open ext/pluginpaths.bnd", then click on "Source" and append the SCR bnd plugin (${plugin-dir}/org.apache.felix.scr.bnd/org.apache.felix.scr.bnd-X.Y.Z-SNAPSHOT.jar) to the current plugin path. |
| For example:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>-pluginpath: ${plugin-dir}/biz.aQute.repository/biz.aQute.repository-2.1.0.jar, \ |
| ${plugin-dir}/org.apache.felix.scr.bnd/org.apache.felix.scr.bnd-1.0.0-SNAPSHOT.jar</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>You have installed the SCR annotations bnd plugin in Eclipse BndTools, and you can now start using it (see the following Tutorial).</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_tutorial"><a class="anchor" href="#_tutorial"></a>Tutorial</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>In this tutorial, we’ll create a "greeting" project, which provides a simple Greeting service with a "sayHello" method, and the implementation will use the Apache Felix SCR annotations:</p> |
| </div> |
| <div class="paragraph"> |
| <p>From the File menu, select New -> Bndtools OSGi Project for creating an empty project, and call it "greeting".</p> |
| </div> |
| <div class="paragraph"> |
| <p>Then click on bnd.bnd file of the greeting project, then click on Source, and add the following (and then save the file)</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>-buildpath: ${plugin-dir}/org.apache.felix.scr.bnd/org.apache.felix.scr.bnd-1.0.0-SNAPSHOT.jar;version=file |
| -plugin: org.apache.felix.scrplugin.bnd.SCRDescriptorBndPlugin |
| Private-Package: greeting.impl |
| Export-Package: greeting.api</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Create the greeting.api.Greeting interface:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">package greeting.api; |
| |
| public interface Greeting { |
| void sayHello(String name); |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>And create the greeting.impl.GreetingImpl class:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">package greeting.impl; |
| |
| import greeting.api.Greeting; |
| |
| import org.apache.felix.scr.annotations.Activate; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Service; |
| |
| @Component(immediate=true) |
| @Service |
| public class GreetingImpl implements Greeting { |
| @Activate |
| private void start() { |
| System.out.println("Starting Greeting Service"); |
| } |
| |
| @Override |
| public void sayHello(String name) { |
| System.out.println("Hello " + name); |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Now, click on bnd.bnd and rebuild the project. |
| you have created your first bndtools project using SCR annotations.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Create a Run descriptor (call it "run") with Apache Felix 4 With Gogo Shell.</p> |
| </div> |
| <div class="paragraph"> |
| <p>In Run requirement, add the greeting project, as well as Apache Felix SCR from Bnd HUB.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Then Run the project: you should see in the console the "Starting Greeting Service" message displayed from the start() method.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_plugin_options"><a class="anchor" href="#_plugin_options"></a>Plugin Options</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>You can possibly add some optional parameters in the plugin bnd directive (each one separated by a semicolon). |
| For example:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>-plugin: org.apache.felix.scrplugin.bnd.SCRDescriptorBndPlugin;log=debug;generateAccessors=false</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Here is the list of options:</p> |
| </div> |
| <hr> |
| <div class="paragraph"> |
| <p><strong><code>log</code></strong> + <em>Required</em>: No + <em>Default</em>: <code>warn</code> + The plugin enabled log level. |
| You can select either one of "error", "warn", "info", or "debug". |
| Plugin logs are written in ${java.io.tmpdir}/scrplugin/BSN.log (BSN is the Bundle Symbolic Name of the bundle being analyzed by the plugin).</p> |
| </div> |
| <hr> |
| <div class="paragraph"> |
| <p><strong><code>destdir</code></strong> + <em>Required</em>: No + <em>Default</em>: <code>bin</code> + The name of the directory where the descriptor files are generated into. |
| This is also used as the directory where the compiled classes are generated by bndtools.</p> |
| </div> |
| <hr> |
| <div class="paragraph"> |
| <p><strong><code>generateAccessors</code></strong> + <em>Required</em>: No + <em>Default</em>: <code>true</code> + If this switch is turned on, the bind and unbind methods for unary references are automatically generated by the plugin.</p> |
| </div> |
| <hr> |
| <div class="paragraph"> |
| <p><strong><code>strictMode</code></strong> + <em>Required</em>: No + <em>Default</em>: <code>false</code> + If set to true, a warning will be considered as an error and the build will fail with warnings generated by this task.</p> |
| </div> |
| <hr> |
| <div class="paragraph"> |
| <p><strong><code>specVersion</code></strong> + <em>Required</em>: No + <em>Default</em>: — + The plugin will generate a descriptor for the Declarative Service version (e.g. |
| 1.0, 1.1, or 1.2). |
| If no value is specified, the plugin will detect the version and only use 1.1 if features from this version are used.</p> |
| </div> |
| </div> |
| </div> |
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