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Posted to commits@felix.apache.org by cl...@apache.org on 2009/01/15 16:35:22 UTC
svn commit: r734735 [5/12] - in /felix/trunk/ipojo: annotations/doc/
annotations/doc/how-to-use-ipojo-annotations_files/
annotations/doc/how-to-use-ipojo-annotations_files/button_data/
annotations/doc/media.data/ ant/doc/ ant/doc/ipojo-ant-task_files/ ...
Added: felix/trunk/ipojo/core/doc/controller-lifecycle-handler_files/ga.js
URL: http://svn.apache.org/viewvc/felix/trunk/ipojo/core/doc/controller-lifecycle-handler_files/ga.js?rev=734735&view=auto
==============================================================================
--- felix/trunk/ipojo/core/doc/controller-lifecycle-handler_files/ga.js (added)
+++ felix/trunk/ipojo/core/doc/controller-lifecycle-handler_files/ga.js Thu Jan 15 07:35:17 2009
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+ <div class="main">
+<table class="sectionMacro" border="0" cellpadding="5" cellspacing="0" width="100%"><tbody><tr>
+<td class="confluenceTd" valign="top" width="80%">
+<h1><a name="iPOJOin10minutes-iPOJOin10minutes"></a>iPOJO in 10 minutes</h1>
+
+<p><em>This page presents how to use the</em> <em>iPOJO</em> <em>runtime
+and its associated service component model. The concepts of the service
+component model are introduced, followed by a simple example that
+demonstrates the features of iPOJO.</em></p>
+
+<h2><a name="iPOJOin10minutes-Introduction"></a>Introduction</h2>
+
+<p>iPOJO aims to simplify service-oriented programming on OSGi frameworks; the name iPOJO is an abbreviation for <em>injected POJO</em>.
+iPOJO provides a new way to develop OSGi service components with the
+main goal being to simplify service component implementation by
+transparently managing the dynamics of the environment as well as other
+non-functional requirements. The iPOJO framework allows developers to
+more clearly separate functional code (i.e., the POJO) from the
+non-functional code (i.e., dependency management, service provision,
+configuration, etc.). iPOJO combines the functional and non-functional
+aspects at run time. To achieve this, iPOJO provides a simple and
+extensible service component model based on POJOs.</p>
+
+<h2><a name="iPOJOin10minutes-ThePOJOconcept"></a>The POJO concept</h2>
+
+<p>POJO is an acronym for Plain Old Java Object, but it embodies a
+concept that the simpler and less intrusive the design of a given
+framework, the better. The name is used to emphasize that a given
+object is not somehow special, but is an ordinary Java Object. Martin
+Fowler, Rebecca Parsons and Josh Mackenzie coined the term POJO in
+September 2000: "We wondered why people were so against using regular
+objects in their systems and concluded that it was because simple
+objects lacked a fancy name. So we gave them one, and it's caught on
+very nicely." From the developer's perspective, the iPOJO framework
+strives to only require POJOs in as much as it is possible.</p>
+
+<h2><a name="iPOJOin10minutes-iPOJOservicecomponentoverview"></a>iPOJO service component overview</h2>
+
+<p>A service component is able to provide and/or require services,
+where a service is an object that implements a given service interface
+embodied as a Java interface. In addition, iPOJO introduces a callback
+concept to notify a component about various state changes.</p>
+
+<p>The component is the central concept in iPOJO. In the core iPOJO
+model, a component describes service dependencies, provided services,
+and callbacks; this information is recorded in the component's
+metadata. Then, the second important concept in iPOJO is component
+instances. A component instances is a special <em>version</em> of the
+component. By merging component metadata and instance configuration,
+the iPOJO runtime is able to manage the component, i.e., manage its
+life cycle, inject required services, publish provided services,
+discover needed services.</p>
+
+<h2><a name="iPOJOin10minutes-Asimpleexample"></a>A simple example</h2>
+
+<p>In this tutorial we will present how to:</p>
+<ul>
+ <li>Publish an OSGi service</li>
+ <li>Require an OSGi service</li>
+ <li>Use lifecycle callbacks to activate and deactivate components</li>
+</ul>
+
+
+<h3><a name="iPOJOin10minutes-PresentationoftheSpellapplication"></a>Presentation of the <em>Spell</em> application</h3>
+
+<p>To illustrate iPOJO features, we will implement a very simple application. This application is composed by three components:</p>
+<ul>
+ <li>A component implementing a dictionary service</li>
+ <li>A component requiring the dictionary service and providing a spellchecker service</li>
+ <li>A component requiring the spellchecker and providing an user interface</li>
+</ul>
+
+
+<p><img src="ipojo-in-10-minutes_files/spell.png" align="absmiddle" border="0"></p>
+
+<h3><a name="iPOJOin10minutes-Preparingthetutorial"></a>Preparing the tutorial</h3>
+
+<p>This tutorial is based on Ant. So, you need to have the Ant program accessible in your path (see <span class="nobr"><a href="http://ant.apache.org/" title="Visit page outside Confluence" rel="nofollow">here<sup><img class="rendericon" src="ipojo-in-10-minutes_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span> to download and install Ant). Download the tutorial archive available <span class="nobr"><a href="http://people.apache.org/%7Eclement/ipojo/tutorials/10min/tutorial.zip" title="Visit page outside Confluence" rel="nofollow">here<sup><img class="rendericon" src="ipojo-in-10-minutes_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span> and then unzip it. The archive is composed by seven directories:</p>
+<ul>
+ <li>spell.services contains service interfaces used by the applications</li>
+ <li>spell.english contains an implementation of the Dictionary service (containing English words)</li>
+ <li>spell.checker
+contains an implementation of a Spell Checker. The spell checker
+requires a dictionary service and check if an input passage is correct
+(according to the words contained in the dictionary).</li>
+ <li>spell.gui
+contains a very simple user interface. This component uses a spell
+checker service. Then the user can interact with the spell checker with
+this user interface.</li>
+ <li>The task directory contains Ant tasks used to build the project</li>
+ <li>The solution directory contains an already developed version of the application.</li>
+ <li>Finally, the felix folder contains a configured version of the Felix runtime</li>
+</ul>
+
+
+<h3><a name="iPOJOin10minutes-Thespell.servicesproject"></a>The spell.services project</h3>
+
+<p>The spell.services project contains only service interfaces. It is not an iPOJO powered bundle.</p>
+
+<p>Go inside the Spell.services directory and create the file "src/spell/services/DictionaryService.java" for the following <em>Dictionary</em> service interface:</p>
+<div class="code"><div class="codeContent">
+<pre class="code-java"><span class="code-keyword">package</span> spell.services;
+/**
+ * A simple service <span class="code-keyword">interface</span> that defines a dictionary service.
+ * A dictionary service simply verifies the existence of a word.
+**/
+<span class="code-keyword">public</span> <span class="code-keyword">interface</span> DictionaryService {
+ /**
+ * Check <span class="code-keyword">for</span> the existence of a word.
+ * @param word the word to be checked.
+ * @<span class="code-keyword">return</span> <span class="code-keyword">true</span> <span class="code-keyword">if</span> the word is in the dictionary,
+ * <span class="code-keyword">false</span> otherwise.
+ **/
+ <span class="code-keyword">public</span> <span class="code-object">boolean</span> checkWord(<span class="code-object">String</span> word);
+}</pre>
+</div></div>
+<p>Then, create the file "src/spell/services/SpellChecker.java" for the following <em>Spell Checker</em> service interface:</p>
+<div class="code"><div class="codeContent">
+<pre class="code-java"><span class="code-keyword">package</span> spell.services;
+/**
+ * A simple service <span class="code-keyword">interface</span> that defines a spell checker service.
+ * A spell checker service checks the spelling of all words in a
+ * given passage. A passage is any number of words separated by
+ * a space character and the following punctuation marks: comma,
+ * period, exclamation mark, question mark, semi-colon, and colon.
+**/
+<span class="code-keyword">public</span> <span class="code-keyword">interface</span> SpellChecker {
+ /**
+ * Checks a given passage <span class="code-keyword">for</span> spelling errors. A passage is any
+ * number of words separated by a space and any of the following
+ * punctuation marks: comma (,), period (.), exclamation mark (!),
+ * question mark (?), semi-colon (;), and colon(:).
+ * @param passage the passage to spell check.
+ * @<span class="code-keyword">return</span> An array of misspelled words or <span class="code-keyword">null</span> <span class="code-keyword">if</span> no
+ * words are misspelled.
+ **/
+ <span class="code-keyword">public</span> <span class="code-object">String</span>[] check(<span class="code-object">String</span> passage);
+}</pre>
+</div></div>
+<p>Once created, you can build the project by launching Ant from the project directory.</p>
+<div class="code"><div class="codeContent">
+<pre class="code-java">$ ant
+Buildfile: build.xml
+clean:
+compile:
+ [mkdir] Created dir: d:\clement\workspaces\sandbox\ipojo\examples\tutorial-ant\
+ spell.services\output
+ [mkdir] Created dir: d:\clement\workspaces\sandbox\ipojo\examples\tutorial-ant\
+ spell.services\output\classes
+ [javac] Compiling 2 source files to d:\clement\workspaces\sandbox\ipojo\examples\
+ tutorial-ant\spell.services\output\classes
+<span class="code-keyword">package</span>:
+ [bnd] spell.services 2
+BUILD SUCCESSFUL
+Total time: 0 seconds</pre>
+</div></div>
+<p>The created bundle is inside the output directory (spell.services.jar). The build process use <span class="nobr"><a href="http://www.aqute.biz/Code/Bnd" title="Visit page outside Confluence" rel="nofollow">BND<sup><img class="rendericon" src="ipojo-in-10-minutes_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span>. The bundle manifest is described in the spell.services.bnd file.<br>
+Once this project is done, we are able to implement a Dictionary service.</p>
+
+<h3><a name="iPOJOin10minutes-Thespell.englishproject:ProvidinganOSGiservice"></a>The spell.english project: Providing an OSGi service</h3>
+
+<p>The spell.english project is a simple dictionary implementation of
+the Dictionary service. It contains few English words. This
+implementation is an iPOJO component.<br>
+The first step is to implement the service. Create the "src/spell/english/EnglishDictionary.java" file for the following <em>Dictionary service</em> implementation:</p>
+<div class="code"><div class="codeContent">
+<pre class="code-java"><span class="code-keyword">package</span> spell.english;
+<span class="code-keyword">import</span> spell.services.DictionaryService;
+/**
+ * An implementation of the Dictionary service containing English words
+ * see DictionaryService <span class="code-keyword">for</span> details of the service.
+ **/
+<span class="code-keyword">public</span> class EnglishDictionary <span class="code-keyword">implements</span> DictionaryService {
+ <span class="code-comment">// The set of words contained in the dictionary.
+</span> <span class="code-object">String</span>[] m_dictionary = { <span class="code-quote">"welcome"</span>, <span class="code-quote">"to"</span>, <span class="code-quote">"the"</span>, <span class="code-quote">"ipojo"</span>, <span class="code-quote">"tutorial"</span> };
+ /**
+ * Implements DictionaryService.checkWord(). Determines
+ * <span class="code-keyword">if</span> the passed in word is contained in the dictionary.
+ * @param word the word to be checked.
+ * @<span class="code-keyword">return</span> <span class="code-keyword">true</span> <span class="code-keyword">if</span> the word is in the dictionary,
+ * <span class="code-keyword">false</span> otherwise.
+ **/
+ <span class="code-keyword">public</span> <span class="code-object">boolean</span> checkWord(<span class="code-object">String</span> word) {
+ word = word.toLowerCase();
+ <span class="code-comment">// This is very inefficient
+</span> <span class="code-keyword">for</span> (<span class="code-object">int</span> i = 0; i < m_dictionary.length; i++) {
+ <span class="code-keyword">if</span> (m_dictionary[i].equals(word)) {
+ <span class="code-keyword">return</span> <span class="code-keyword">true</span>;
+ }
+ }
+ <span class="code-keyword">return</span> <span class="code-keyword">false</span>;
+ }
+}</pre>
+</div></div>
+<p>Notice that this class does not contains neither OSGi nor iPOJO
+specific code. It is just an implementation of the Dictionary Service
+interface.<br>
+Once created, we need to describe this component to ask iPOJO to manage
+it. To achieve this, create the "metadata.xml" file in the
+spell.english directory:</p>
+<div class="code"><div class="codeContent">
+<pre class="code-xml"><span class="code-tag"><ipojo></span>
+<span class="code-tag"><component classname=<span class="code-quote">"spell.english.EnglishDictionary"</span>></span>
+ <span class="code-tag"><provides/></span>
+<span class="code-tag"></component></span>
+<span class="code-tag"><instance component=<span class="code-quote">"spell.english.EnglishDictionary"</span>/></span>
+<span class="code-tag"></ipojo></span></pre>
+</div></div>
+<p>This file describes the Dictionary service implementation. First it creates a <em>component</em>. This component has a <em>classname</em> attribute containing the implementation class name. The <em>'provides'</em>
+element indicates that the component provide a service. Provided
+service interfaces are computed by iPOJO, so it is not necessary to
+indicate them. The <em>instance</em> element asks iPOJO to create an
+instance of the described component when the bundle starts. The
+relation between components and instances is the same than between
+classes and objects in the object oriented programming. The <em>component</em>
+attribute indicates which component needs to be instantiated. By
+default, component type name is the implementation class (i.e. the
+classname attribute).</p>
+
+<p>Then, we are able to create the bundle. In the spell.english directory launch the ant command:</p>
+<div class="code"><div class="codeContent">
+<pre class="code-java">$ ant
+Buildfile: build.xml
+clean:
+ [delete] Deleting directory d:\clement\workspaces\sandbox\ipojo\examples\
+ tutorial-ant\spell.english\output\classes
+ [delete] Deleting directory d:\clement\workspaces\sandbox\ipojo\examples\
+ tutorial-ant\spell.english\output
+buildclasspath:
+compile:
+ [mkdir] Created dir: d:\clement\workspaces\sandbox\ipojo\examples\
+ tutorial-ant\spell.english\output
+ [mkdir] Created dir: d:\clement\workspaces\sandbox\ipojo\examples\
+ tutorial-ant\spell.english\output\classes
+ [javac] Compiling 1 source file to d:\clement\workspaces\sandbox\ipojo\examples\
+ tutorial-ant\spell.english\output\classes
+<span class="code-keyword">package</span>:
+ [bnd] spell.english 1
+ [ipojo] Input Bundle File : d:\clement\workspaces\sandbox\ipojo\examples\
+ tutorial-ant\spell.english\output\spell.english.jar
+ [ipojo] Metadata File : d:\clement\workspaces\sandbox\ipojo\examples\
+ tutorial-ant\spell.english\metadata.xml
+ [ipojo] Start bundle manipulation
+ [ipojo] Bundle manipulation - SUCCESS
+ [ipojo] Output File : d:\clement\workspaces\sandbox\ipojo\examples\
+ tutorial-ant\spell.english\output\spell.english.jar
+BUILD SUCCESSFUL
+Total time: 1 second</pre>
+</div></div>
+<p>The created bundle is inside the output directory
+(spell.english.jar). The build process is based on BND and on the iPOJO
+Ant task. The manifest of the bundle is described in the
+spell.english.bnd file.</p>
+
+<h3><a name="iPOJOin10minutes-Thespell.checkerproject:RequiringanOSGiservice"></a>The spell.checker project: Requiring an OSGi service</h3>
+
+<p>The spell.checker project aims to provide a <em>spell checker</em> service. However, to serve this service, this implementation requires a <em>dictionary</em>
+service. During this step, we will create an iPOJO component requiring
+a Dictionary service and providing the Spell Checker service.</p>
+
+<p>First create the file "src/spell/checker/SpellCheck.java" in the spell.checker directory for the following <em>Check Speller service</em> implementation:</p>
+<div class="code"><div class="codeContent">
+<pre class="code-java"><span class="code-keyword">package</span> spell.checker;
+<span class="code-keyword">import</span> java.util.ArrayList;
+<span class="code-keyword">import</span> java.util.List;
+<span class="code-keyword">import</span> java.util.StringTokenizer;
+<span class="code-keyword">import</span> spell.services.DictionaryService;
+<span class="code-keyword">import</span> spell.services.SpellChecker;
+<span class="code-keyword">public</span> class SpellCheck <span class="code-keyword">implements</span> SpellChecker {
+ <span class="code-keyword">private</span> DictionaryService m_dictionary;
+ /**
+ * Implements SpellChecker.check(). Checks the given passage <span class="code-keyword">for</span> misspelled words.
+ * @param passage the passage to spell check.
+ * @<span class="code-keyword">return</span> An array of misspelled words or <span class="code-keyword">null</span> <span class="code-keyword">if</span> no words are misspelled.
+ */
+ <span class="code-keyword">public</span> <span class="code-object">String</span>[] check(<span class="code-object">String</span> passage) {
+ <span class="code-comment">// No misspelled words <span class="code-keyword">for</span> an empty string.
+</span> <span class="code-keyword">if</span> ((passage == <span class="code-keyword">null</span>) || (passage.length() == 0)) { <span class="code-keyword">return</span> <span class="code-keyword">null</span>; }
+ List errorList = <span class="code-keyword">new</span> ArrayList();
+ <span class="code-comment">// Tokenize the passage using spaces and punctuation.
+</span> StringTokenizer st = <span class="code-keyword">new</span> StringTokenizer(passage, <span class="code-quote">" ,.!?;:"</span>);
+ <span class="code-comment">// Loop through each word in the passage.
+</span> <span class="code-keyword">while</span> (st.hasMoreTokens()) {
+ <span class="code-object">String</span> word = st.nextToken();
+ <span class="code-comment">// Check the current word.
+</span> <span class="code-keyword">if</span> (! m_dictionary.checkWord(word)) {
+ <span class="code-comment">// If the word is not correct, then add it
+</span> <span class="code-comment">// to the incorrect word list.
+</span> errorList.add(word);
+ }
+ }
+ <span class="code-comment">// Return <span class="code-keyword">null</span> <span class="code-keyword">if</span> no words are incorrect.
+</span> <span class="code-keyword">if</span> (errorList.size() == 0) { <span class="code-keyword">return</span> <span class="code-keyword">null</span>; }
+ <span class="code-comment">// Return the array of incorrect words.
+</span> <span class="code-keyword">return</span> (<span class="code-object">String</span>[]) errorList.toArray(<span class="code-keyword">new</span> <span class="code-object">String</span>[errorList.size()]);
+ }
+}</pre>
+</div></div>
+<p>This class implements the SpellChecker service interface as it will provide it. Moreover, it has a <em>special</em>
+field "_m_dictionary_". This field represents the required service.
+iPOJO will inject a Dictionary service when needed. So, the class can
+use it directly. Notice that this class as no OSGi specific code, both
+the service providing and the requiring are managed by iPOJO. If the
+used dictionary service leaves, iPOJO will try to find another
+provider. If no more providers are available, the instance is
+invalidated, and the provided service is withdrawn from the service
+registry.</p>
+
+<p>Once implemented, we need to describe this component. Create the
+"metadata.xml" file in the spell.checker directory for the following
+component descriptor:</p>
+<div class="code"><div class="codeContent">
+<pre class="code-xml"><span class="code-tag"><ipojo></span>
+<span class="code-tag"><component classname=<span class="code-quote">"spell.checker.SpellCheck"</span>></span>
+ <span class="code-tag"><requires field=<span class="code-quote">"m_dictionary"</span>/></span>
+ <span class="code-tag"><provides/></span>
+<span class="code-tag"></component></span>
+<span class="code-tag"><instance component=<span class="code-quote">"spell.checker.SpellCheck"</span>/></span>
+<span class="code-tag"></ipojo></span></pre>
+</div></div>
+<p>This description contains a '<em>requires'</em> element. This element indicates to iPOJO to manage the service dependency. The <em>field</em>
+attributes describe in which member of the class the service need to be
+injected. It is not necessary to write the required service as it is
+computed by iPOJO. Notice that iPOJO can inject required service by
+invoking methods too.</p>
+
+<p>Finally, we are able to build the bundle. As for previous projects, launch Ant from the project directory.</p>
+
+<h3><a name="iPOJOin10minutes-Thespell.checker.guiproject"></a>The spell.checker.gui project</h3>
+
+<p>The spell.check.gui project contains a very simple user interface (in Swing) allowing a user to interact with a <em>spell checker</em> service.</p>
+
+<p>Create the "src\spell\gui\SpellCheckerGui.java" for the following implementation:</p>
+<div class="code"><div class="codeContent">
+<pre class="code-java"><span class="code-keyword">package</span> spell.gui;
+<span class="code-keyword">import</span> javax.swing.JButton;
+<span class="code-keyword">import</span> javax.swing.JFrame;
+<span class="code-keyword">import</span> javax.swing.JLabel;
+<span class="code-keyword">import</span> javax.swing.JTextField;
+<span class="code-keyword">import</span> spell.services.SpellChecker;
+/**
+ * A very simple Gui interacting with the CheckSpeller service
+ */
+<span class="code-keyword">public</span> class SpellCheckerGui <span class="code-keyword">extends</span> JFrame {
+ /**
+ * Swing component where the user write the passage to check.
+ */
+ <span class="code-keyword">private</span> JTextField m_passage = <span class="code-keyword">null</span>;
+
+ /**
+ * Check button
+ */
+ <span class="code-keyword">private</span> JButton m_checkButton = <span class="code-keyword">null</span>;
+
+ /**
+ * Area where the result is displayed.
+ */
+ <span class="code-keyword">private</span> JLabel m_result = <span class="code-keyword">null</span>;
+ /**
+ * Service dependency on the SpellChecker.
+ */
+ <span class="code-keyword">private</span> SpellChecker m_checker;
+
+ /**
+ * Constructor.
+ * Initialize the GUI.
+ */
+ <span class="code-keyword">public</span> SpellCheckerGui() {
+ <span class="code-keyword">super</span>();
+ initComponents();
+ <span class="code-keyword">this</span>.setTitle(<span class="code-quote">"Spellchecker Gui"</span>);
+ }
+ /**
+ * Initialize the Swing Gui.
+ */
+ <span class="code-keyword">private</span> void initComponents() {
+ java.awt.GridBagConstraints gridBagConstraints;
+ m_checkButton = <span class="code-keyword">new</span> javax.swing.JButton();
+ m_result = <span class="code-keyword">new</span> javax.swing.JLabel();
+ m_passage = <span class="code-keyword">new</span> javax.swing.JTextField();
+ setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); <span class="code-comment">//Stop Felix
+</span> getContentPane().setLayout(<span class="code-keyword">new</span> java.awt.GridBagLayout());
+ m_checkButton.setText(<span class="code-quote">"Check"</span>);
+ m_checkButton.addActionListener(<span class="code-keyword">new</span> java.awt.event.ActionListener() {
+ <span class="code-keyword">public</span> void actionPerformed(java.awt.event.ActionEvent e) {
+ check();
+ }
+ });
+ gridBagConstraints = <span class="code-keyword">new</span> java.awt.GridBagConstraints();
+ gridBagConstraints.gridx = 0;
+ gridBagConstraints.gridy = 1;
+ gridBagConstraints.insets = <span class="code-keyword">new</span> java.awt.Insets(2, 2, 2, 2);
+ getContentPane().add(m_checkButton, gridBagConstraints);
+ m_result.setPreferredSize(<span class="code-keyword">new</span> java.awt.Dimension(175, 20));
+ gridBagConstraints = <span class="code-keyword">new</span> java.awt.GridBagConstraints();
+ gridBagConstraints.gridx = 0;
+ gridBagConstraints.gridy = 2;
+ gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
+ gridBagConstraints.insets = <span class="code-keyword">new</span> java.awt.Insets(2, 2, 2, 2);
+ getContentPane().add(m_result, gridBagConstraints);
+ m_passage.setPreferredSize(<span class="code-keyword">new</span> java.awt.Dimension(175, 20));
+ gridBagConstraints = <span class="code-keyword">new</span> java.awt.GridBagConstraints();
+ gridBagConstraints.gridx = 0;
+ gridBagConstraints.gridy = 0;
+ gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
+ gridBagConstraints.insets = <span class="code-keyword">new</span> java.awt.Insets(2, 2, 2, 2);
+ getContentPane().add(m_passage, gridBagConstraints);
+ pack();
+ }
+ /**
+ * Check Button action.
+ * Collects the user input and checks it.
+ */
+ <span class="code-keyword">private</span> void check() {
+ <span class="code-object">String</span>[] result = m_checker.check(m_passage.getText());
+ <span class="code-keyword">if</span> (result != <span class="code-keyword">null</span>) {
+ m_result.setText(result.length + <span class="code-quote">" word(s) are mispelled"</span>);
+ } <span class="code-keyword">else</span> {
+ m_result.setText(<span class="code-quote">"All words are correct"</span>);
+ }
+ }
+ /**
+ * Start callback.
+ * This method will be called when the instance becomes valid.
+ * It set the Gui visibility to <span class="code-keyword">true</span>.
+ */
+ <span class="code-keyword">public</span> void start() {
+ <span class="code-keyword">this</span>.setVisible(<span class="code-keyword">true</span>);
+ }
+ /**
+ * Stop callback.
+ * This method will be called when the instance becomes invalid or stops.
+ * It deletes the Gui.
+ */
+ <span class="code-keyword">public</span> void stop() {
+ <span class="code-keyword">this</span>.dispose();
+ }
+}</pre>
+</div></div>
+<p>Look at the three last methods. The <em>check</em> methods collect the user input and use a <em>Check speller</em> service to check this input. This method is called when the button is pressed by the user. The <em>start</em> and <em>stop</em>
+methods are lifecycle callbacks. As we need to display the user
+interface when the instance is created and to delete it when the
+instance stops, we need a way to be notified when we need to execute
+these actions. iPOJO provide an easy way to do this. The component
+provides two callback methods for its activation and deactivation,
+start and stop, respectively. Callbacks are used when the component
+needs to be informed about a component state change. In iPOJO, the
+component state is either <b>INVALID</b> (i.e., not all of the component's constraints are satisfied) or <b>VALID</b>
+(i.e., all of the component's constraints are satisfied). In this
+example, the start callback method set the GUI visibility to true; the
+stop callback method deletes the GUI. The component metadata will
+instruct iPOJO to invoke these methods when the component's state
+changes to <b>VALID</b> or <b>INVALID</b> respectively.</p>
+
+<p>Create the <em>metadata.xml</em> file in the spell.chercker.gui directory with the following content:</p>
+<div class="code"><div class="codeContent">
+<pre class="code-xml"><span class="code-tag"><ipojo></span>
+<span class="code-tag"><component classname=<span class="code-quote">"spell.gui.SpellCheckerGui"</span>></span>
+ <span class="code-tag"><requires field=<span class="code-quote">"m_checker"</span>/></span>
+ <span class="code-tag"><callback transition=<span class="code-quote">"validate"</span> method=<span class="code-quote">"start"</span>/></span>
+ <span class="code-tag"><callback transition=<span class="code-quote">"invalidate"</span> method=<span class="code-quote">"stop"</span>/></span>
+<span class="code-tag"></component></span>
+<span class="code-tag"><instance component=<span class="code-quote">"spell.gui.SpellCheckerGui"</span>/></span>
+<span class="code-tag"></ipojo></span></pre>
+</div></div>
+<p>The component element again has the '<em>classname'</em> attribute that refers to the component implementation class. The '<em>requires</em>' element describes the <em>Check Speller</em> service dependency by simply specifying its associated component field. The '<em>callback'</em> elements describe which method to invoke when the component's state changes. Then the <em>'instance'</em> element asks iPOJO to create an instance of the component.</p>
+
+<p>Once this file is created, you can compile the project by launching <em>ant</em> in the spell.checker.gui directory.</p>
+
+<h2><a name="iPOJOin10minutes-Runningtheapplication"></a>Running the application</h2>
+
+<p>To run the example, start Felix. A distribution of Felix is provided
+in the felix directory. This version is configured to launch iPOJO
+automatically. From the Felix directory, launch the following command
+to start the framework. Then enter a profile name.</p>
+<div class="code"><div class="codeContent">
+<pre class="code-java">java -jar bin/felix.jar</pre>
+</div></div>
+<p>You can check installed bundles by using the '<em>ps</em>' command:</p>
+<div class="code"><div class="codeContent">
+<pre class="code-java">-> ps
+START LEVEL 1
+ ID State Level Name
+[ 0] [Active ] [ 0] <span class="code-object">System</span> Bundle (1.0.3)
+[ 1] [Active ] [ 1] Apache Felix Shell Service (1.0.0)
+[ 2] [Active ] [ 1] Apache Felix Shell TUI (1.0.0)
+[ 3] [Active ] [ 1] Apache Felix Bundle Repository (1.0.2)
+[ 4] [Active ] [ 1] iPOJO (1.0.0)
+-></pre>
+</div></div>
+<p>iPOJO runtime is the bundle 4. Once started, install the four created bundles as above:</p>
+<div class="code"><div class="codeContent">
+<pre class="code-java">start file:../spell.services/output/spell.services.jar
+start file:../spell.english/output/spell.english.jar
+start file:../spell.checker/output/spell.checker.jar
+start file:../spell.checker.gui/output/spell.checker.gui.jar</pre>
+</div></div>
+<p>When starting the GUI bundle, the user interface appears. Indeed, the <em>Check Speller</em> service is provided. You can interact with this service by entering a passage and clicking on the check button:<br>
+<img src="ipojo-in-10-minutes_files/ss.png" align="absmiddle" border="0"><br>
+Then, stop the <em>Dictionary</em> service provider (with the <em>stop 6</em>) command. The GUI disappears. Indeed, Spell Checker service cannot be provided as it depends on the Dictionary service.<br>
+<img src="ipojo-in-10-minutes_files/spell2.png" align="absmiddle" border="0"><br>
+Then, restart the Dictionary service provider with the <em>start 6</em> command. The GUI reappears immediately. You can try to stop the <em>check speller</em> service provider without stopping the <em>dictionary</em> service provider with the <em>stop 7</em> command. As for the last manipulation, the GUI disappears.<br>
+<img src="ipojo-in-10-minutes_files/spell3.png" align="absmiddle" border="0"><br>
+To go further in the exploration, modify the spell.cheker implementation. For example, add a simple trace, printing wrong words:</p>
+<div class="code"><div class="codeContent">
+<pre class="code-java"><span class="code-comment">// ...
+</span> <span class="code-comment">// Return <span class="code-keyword">null</span> <span class="code-keyword">if</span> no words are incorrect.
+</span> <span class="code-keyword">if</span> (errorList.size() == 0) { <span class="code-keyword">return</span> <span class="code-keyword">null</span>; }
+
+ <span class="code-comment">// Return the array of incorrect words.
+</span> <span class="code-object">System</span>.out.println(<span class="code-quote">"Wrong words:"</span> + errorList); <span class="code-comment">// <-- Add <span class="code-keyword">this</span> line
+</span> <span class="code-keyword">return</span> (<span class="code-object">String</span>[]) errorList.toArray(<span class="code-keyword">new</span> <span class="code-object">String</span>[errorList.size()]);</pre>
+</div></div>
+
+<p>Then rebuild the spell.checker bundle and update it (with the
+'update 7' command). You will see the gui "blinking". In fact, the gui
+was stopped as the required spell checker service was no more
+available. As soon as it was back, the gui restarts. The gui didn't
+lose its state. The other services weren't stopped during the update.<br>
+You can uninstall the check service bundle and then re-install a new one (or the same one), you will see the same behavior. </p>
+
+<h2><a name="iPOJOin10minutes-Conclusion"></a>Conclusion</h2>
+
+<p>We saw how to use easily iPOJO to build service-oriented component. In this tutorial, we have demonstrated how to:</p>
+<ul>
+ <li>Publish OSGi services</li>
+ <li>Require OSGi services</li>
+ <li>Use lifecycle callbacks to activate and deactivate components</li>
+</ul>
+
+
+<p>iPOJO provides a lot of others features that you can try in the
+others available tutorials. Subscribe to the Felix users mailing list
+by sending a message to <span class="nobr"><a href="mailto:users-subscribe@felix.apache.org" title="Send mail to users-subscribe@felix.apache.org" rel="nofollow">users-subscribe@felix.apache.org<sup><img class="rendericon" src="ipojo-in-10-minutes_files/mail_small.gif" alt="" align="absmiddle" border="0" width="13" height="12"></sup></a></span>; after subscribing, email questions or feedback to <span class="nobr"><a href="mailto:users@felix.apache.org" title="Send mail to users@felix.apache.org" rel="nofollow">users@felix.apache.org<sup><img class="rendericon" src="ipojo-in-10-minutes_files/mail_small.gif" alt="" align="absmiddle" border="0" width="13" height="12"></sup></a></span>.</p>
+</td>
+<td class="confluenceTd" valign="top" width="20%">
+<h6><a name="iPOJOin10minutes-Overview"></a><b>Overview</b></h6>
+<ul>
+ <li><a href="http://felix.apache.org/site/apache-felix-ipojo.html" title="Apache Felix iPOJO">Home Page</a></li>
+ <li><a href="http://felix.apache.org/site/apache-felix-ipojo-feature-overview.html" title="Apache Felix iPOJO Feature Overview">iPOJO Feature Overview</a></li>
+ <li><a href="http://felix.apache.org/site/download.html" title="Download">Download & Install </a></li>
+</ul>
+
+
+<h6><a name="iPOJOin10minutes-GettingStarted"></a><b>Getting Started</b></h6>
+<ul>
+ <li><a href="" title="iPOJO in 10 minutes">iPOJO in 10 minutes</a></li>
+ <li><a href="http://felix.apache.org/site/how-to-use-ipojo-annotations.html" title="How to use iPOJO Annotations">How to use iPOJO Annotations</a></li>
+ <li><a href="http://felix.apache.org/site/ipojo-hello-word-maven-based-tutorial.html" title="iPOJO Hello Word (Maven-Based) tutorial">iPOJO Hello Word (Maven-Based) tutorial</a></li>
+ <li><a href="http://felix.apache.org/site/ipojo-advanced-tutorial.html" title="iPOJO Advanced Tutorial">iPOJO Advanced Tutorial</a></li>
+ <li><a href="http://felix.apache.org/site/ipojo-composition-tutorial.html" title="iPOJO Composition Tutorial">iPOJO Composition Tutorial</a></li>
+</ul>
+
+
+<h6><a name="iPOJOin10minutes-UserGuide"></a><b>User Guide</b></h6>
+<ul>
+ <li><a href="http://felix.apache.org/site/describing-components.html" title="Describing components">Describing components (handler list) </a></li>
+ <li><a href="http://felix.apache.org/site/using-xml-schemas.html" title="Using XML Schemas">Using XML Schemas</a></li>
+ <li><a href="http://felix.apache.org/site/apache-felix-ipojo-testing-components.html" title="apache-felix-ipojo-testing-components">Testing components</a></li>
+ <li><a href="http://felix.apache.org/site/ipojo-advanced-topics.html" title="iPOJO Advanced Topics">Advanced Topics</a></li>
+ <li><a href="http://felix.apache.org/site/ipojo-faq.html" title="iPOJO FAQ">FAQ</a></li>
+</ul>
+
+
+<h6><a name="iPOJOin10minutes-Tools"></a><b>Tools</b></h6>
+<ul>
+ <li><a href="http://felix.apache.org/site/ipojo-eclipse-plug-in.html" title="iPOJO Eclipse Plug-in">iPOJO Eclipse Plug-in</a></li>
+ <li><a href="http://felix.apache.org/site/ipojo-ant-task.html" title="iPOJO Ant Task">iPOJO Ant Task</a></li>
+ <li><a href="http://felix.apache.org/site/ipojo-maven-plug-in.html" title="iPOJO Maven Plug-in">iPOJO Maven Plug-in</a></li>
+ <li><a href="http://felix.apache.org/site/apache-felix-ipojo-junit4osgi.html" title="apache-felix-ipojo-junit4osgi">Junit4OSGi</a></li>
+ <li><a href="http://felix.apache.org/site/ipojo-concepts-overview.html" title="iPOJO Concepts Overview">iPOJO concepts overview</a></li>
+</ul>
+
+
+<h6><a name="iPOJOin10minutes-DeveloperGuide"></a><b>Developer Guide</b></h6>
+<ul>
+ <li>API: <span class="nobr"><a href="http://people.apache.org/%7Eclement/ipojo/api/1.0/" title="Visit page outside Confluence" rel="nofollow">1.0<sup><img class="rendericon" src="ipojo-in-10-minutes_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
+ <li><a href="http://felix.apache.org/site/how-to-write-your-own-handler.html" title="How to write your own handler">How to write your own handler</a></li>
+ <li><a href="http://felix.apache.org/site/how-to-use-ipojo-manipulation-metadata.html" title="How to use iPOJO Manipulation Metadata">How to use iPOJO Manipulation Metadata</a></li>
+ <li><a href="http://felix.apache.org/site/dive-into-the-ipojo-manipulation-depths.html" title="Dive into the iPOJO Manipulation depths">Dive into the iPOJO Manipulation depths</a></li>
+</ul>
+
+
+<h6><a name="iPOJOin10minutes-Misc&Contact"></a><b>Misc & Contact</b></h6>
+<ul>
+ <li><a href="http://felix.apache.org/site/apache-felix-ipojo-issuestracker.html" title="apache-felix-ipojo-issuestracker">Issues Tracker</a></li>
+ <li><a href="http://felix.apache.org/site/apache-felix-ipojo-supportedvms.html" title="apache-felix-ipojo-supportedVMs">Supported JVMs</a></li>
+ <li><a href="http://felix.apache.org/site/apache-felix-ipojo-supportedosgi.html" title="apache-felix-ipojo-supportedOSGi">Supported OSGi Implementations</a></li>
+ <li><span class="nobr"><a href="http://ipojo-dark-side.blogspot.com/" title="Visit page outside Confluence" rel="nofollow">iPOJO's Dark Side Blog<sup><img class="rendericon" src="ipojo-in-10-minutes_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
+ <li><a href="http://felix.apache.org/site/future-ideas.html" title="Future Ideas">Future Ideas</a></li>
+ <li><a href="http://felix.apache.org/site/contact.html" title="Contact">Contact</a></li>
+ <li><a href="http://felix.apache.org/site/related-works.html" title="Related Works">Related Works</a></li>
+ <li><a href="http://felix.apache.org/site/article-presentations.html" title="Article & Presentations">Article & Presentations</a></li>
+</ul>
+
+
+<hr>
+<div class="" align="center">
+<p><span class="nobr"><a href="http://cwiki.apache.org/confluence/createrssfeed.action?types=blogpost&statuses=created&statuses=modified&spaces=FELIX&labelString=iPOJO&rssType=atom&maxResults=10&timeSpan=5&publicFeed=true&title=iPOJO%20Atom%20Feed" title="Stay tuned!" rel="nofollow"><img src="ipojo-in-10-minutes_files/feed-icon-32x32.png" align="absmiddle" border="0"><sup><img class="rendericon" src="ipojo-in-10-minutes_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></p></div>
+
+<script type="text/javascript">
+var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
+document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
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+var pageTracker = _gat._getTracker("UA-1518442-4");
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+</script>
+</td></tr></tbody></table>
+ </div>
+ </body></html>
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+<html><head>
+<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"><!-- ads start -->
+</head><body><a href="http://eu.apachecon.com/c/aceu2009/" target="_blank"><img src="button_data/2009-europe-125x125.png" title="ApacheCon Europe 2009" border="0" width="125" height="125"></a>
+<!-- ads end -->
+</body></html>
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