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From conflue...@apache.org
Subject [CONF] Apache Felix: Service Component Runtime Tutorial (page edited)
Date Fri, 31 Aug 2007 05:46:00 GMT
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}

#foldertab li a:link { color: #ffffff; }
#foldertab li a:visited { color: #ffffff; }

#foldertab li a:hover {
color: #ffffff;
background: #003366;
border-color: #003366;
}

#foldertab li a.current {
background: white;
border-bottom: 1px solid white;
color: black;
}

#foldertab li a.current:link { color: black; }
#foldertab li a.current:visited { color: black; }
#foldertab li a.current:hover {
background: white;
border-bottom: 1px solid white;
color: black;
}

/* alphabet list */
ul#squaretab {
margin-left: 0;
padding-left: 0;
white-space: nowrap;
font: bold 8px Verdana, sans-serif;
}

#squaretab li {
display: inline;
list-style-type: none;
}

#squaretab a {
padding: 2px 6px;
border: 1px solid #3c78b5;
}

#squaretab a:link, #squaretab a:visited {
color: #fff;
background-color: #3c78b5;
text-decoration: none;
}

#squaretab a:hover {
color: #ffffff;
background-color: #003366;
border-color: #003366;
text-decoration: none;
}

#squaretab li a#current {
background: white;
color: black;
}

.blogcalendar * {
    font-family:verdana, arial, sans-serif;
    font-size:x-small;
    font-weight:normal;
    line-height:140%;
    padding:2px;
}


table.blogcalendar {
    border: 1px solid #3c78b5;
}

.blogcalendar th.calendarhead, a.calendarhead {
    font-size:x-small;
    font-weight:bold;
    padding:2px;
    text-transform:uppercase;
    background-color: #3c78b5;
    color: #ffffff;
    letter-spacing: .3em;
    text-transform: uppercase;
}

.calendarhead:visited {color: white;}
.calendarhead:active {color: white;}
.calendarhead:hover {color: white;}

.blogcalendar th {
    font-size:x-small;
    font-weight:bold;
    padding:2px;
    background-color:#f0f0f0;
}

.blogcalendar td {
    font-size:x-small;
    font-weight:normal;
}

.searchGroup { padding: 0 0 10px 0; background: #f0f0f0; }
.searchGroupHeading { font-size: 10px; font-weight: bold; color: #ffffff; background-color:
#3c78b5; padding: 2px 4px 1px 4px; }
.searchItem { padding: 1px 4px 1px 4px; }
.searchItemSelected { padding: 1px 4px 1px 4px; font-weight: bold; background: #ddd; }

/* permissions page styles */
.permissionHeading {
    border-bottom: #bbb; border-width: 0 0 1px 0; border-style: solid; font-size: 16px; text-align:
left;
}
.permissionTab {
    border-width: 0 0 0 1px; border-style: solid; background: #3c78b5; color: #ffffff; font-size:
10px;
}
.permissionSuperTab {
    border-width: 0 0 0 1px; border-style: solid; background: #003366; color: #ffffff;
}
.permissionCell {
    border-left: #bbb; border-width: 0 0 0 1px; border-style: solid;
}

/* warning panel */
.warningPanel { background: #FFFFCE; border:#F0C000 1px solid; padding: 8px; margin: 10px;
}
/* alert panel */
.alertPanel { background: #FFCCCC; border:#C00 1px solid; padding: 8px; margin: 10px; }
/* info panel */
.infoPanel { background: #D8E4F1; border:#3c78b5 1px solid; padding: 8px; margin: 10px; }

/* side menu highlighting (e.g. space content screen) */
.optionPadded { padding: 2px; }
.optionSelected { background-color: #ffffcc; padding: 2px; border: 1px solid #ddd; margin:
-1px; }
.optionSelected a { font-weight: bold; text-decoration: none; color: black; }

/* information macros */
.noteMacro { border-style: solid; border-width: 1px; border-color: #F0C000; background-color:
#FFFFCE; text-align:left; margin-top: 5px; margin-bottom: 5px}
.warningMacro { border-style: solid; border-width: 1px; border-color: #c00; background-color:
#fcc; text-align:left; margin-top: 5px; margin-bottom: 5px}
.infoMacro { border-style: solid; border-width: 1px; border-color: #3c78b5; background-color:
#D8E4F1; text-align:left; margin-top: 5px; margin-bottom: 5px}
.tipMacro { border-style: solid; border-width: 1px; border-color: #090; background-color:
#dfd; text-align:left; margin-top: 5px; margin-bottom: 5px}
.informationMacroPadding { padding: 5px 0 0 5px; }

table.infoMacro td, table.warningMacro td, table.tipMacro td, table.noteMacro td, table.sectionMacro
td {
    border: none;
}

table.sectionMacroWithBorder td.columnMacro { border-style: dashed; border-width: 1px; border-color:
#cccccc;}

.pagecontent
{
    padding: 10px;
    text-align: left;
}

/* styles for links in the top bar */
.topBarDiv a:link {color: #ffffff;}
.topBarDiv a:visited {color: #ffffff;}
.topBarDiv a:active {color: #ffffff;}
.topBarDiv a:hover {color: #ffffff;}
.topBarDiv {color: #ffffff;}

.topBar {
    background-color: #003366;
}


/* styles for extended operations */
.greyLinks a:link {color: #666666; text-decoration:underline;}
.greyLinks a:visited {color: #666666; text-decoration:underline;}
.greyLinks a:active {color: #666666; text-decoration:underline;}
.greyLinks a:hover {color: #666666; text-decoration:underline;}
.greyLinks {color: #666666; display:block; padding: 10px}

.logoSpaceLink {color: #999999; text-decoration: none}
.logoSpaceLink a:link {color: #999999; text-decoration: none}
.logoSpaceLink a:visited {color: #999999; text-decoration: none}
.logoSpaceLink a:active {color: #999999; text-decoration: none}
.logoSpaceLink a:hover {color: #003366; text-decoration: none}

/* basic panel (basicpanel.vmd) style */
.basicPanelContainer {border: 1px solid #3c78b5; margin-top: 2px; margin-bottom: 8px; width:
100%}
.basicPanelTitle {padding: 5px; margin: 0px; background-color: #f0f0f0; color: black; font-weight:
bold;}
.basicPanelBody {padding: 5px; margin: 0px}

.separatorLinks a:link {color: white}
.separatorLinks a:visited {color: white}
.separatorLinks a:active {color: white}

.greynavbar {background-color: #f0f0f0; border-top: 1px solid #3c78b5; margin-top: 2px}

div.headerField {
    float: left;
    width: auto;
    height: 100%;
}

.headerFloat {
    margin-left: auto;
    width: 50%;
}

.headerFloatLeft {
    float: left;
    margin-right: 20px;
    margin-bottom: 10px;
}

#headerRow {
    padding: 10px;
}

div.license-personal {
   background-color: #003366;
   color: #ffffff;
}

div.license-personal a {
   color: #ffffff;
}

.greyFormBox {
    border: 1px solid #cccccc;
    padding: 5px;
}

/* IE automatically adds a margin before and after form tags. Use this style to remove that
*/
.marginlessForm {
    margin: 0px;
}

.openPageHighlight {
    background-color: #ffffcc;
    padding: 2px;
    border: 1px solid #ddd;
}

.editPageInsertLinks, .editPageInsertLinks a
{
    color: #666666;
    font-weight: bold;
    font-size: 10px;
}

/* Style for label heatmap. */
.top10 a {
    font-weight: bold;
    font-size: 2em;
    color: #003366;
}
.top25 a {
    font-weight: bold;
    font-size: 1.6em;
    color: #003366;
}
.top50 a {
    font-size: 1.4em;
    color: #003366;
}
.top100 a {
    font-size: 1.2em;
    color: #003366;
}

.heatmap {
    list-style:none;
    width: 95%;
    margin: 0px auto;
}

.heatmap a {
    text-decoration:none;
}

.heatmap a:hover {
    text-decoration:underline;
}

.heatmap li {
    display: inline;
}

.minitab {
padding: 3px 0px 3px 8px;
margin-left: 0;
margin-top: 1px;
margin-bottom: 0px;
border-bottom: 1px solid #3c78b5;
font: bold 9px Verdana, sans-serif;
text-decoration: none;
float:none;
}
.selectedminitab {
padding: 3px 0.5em;
margin-left: 3px;
margin-top: 1px;
border: 1px solid #3c78b5;
background: white;
border-bottom: 1px solid white;
color: #000000;
text-decoration: none;
}
.unselectedminitab {
padding: 3px 0.5em;
margin-left: 3px;
margin-top: 1px;
border: 1px solid #3c78b5;
border-bottom: none;
background: #3c78b5;
color: #ffffff;
text-decoration: none;
}

a.unselectedminitab:hover {
color: #ffffff;
background: #003366;
border-color: #003366;
}

a.unselectedminitab:link { color: white; }
a.unselectedminitab:visited { color: white; }

a.selectedminitab:link { color: black; }
a.selectedminitab:visited { color: black; }

.linkerror { background-color: #fcc;}

a.labelOperationLink:link {text-decoration: underline}
a.labelOperationLink:active {text-decoration: underline}
a.labelOperationLink:visited {text-decoration: underline}
a.labelOperationLink:hover {text-decoration: underline}

a.newLabel:link {background-color: #ddffdd}
a.newLabel:active {background-color: #ddffdd}
a.newLabel:visited {background-color: #ddffdd}
a.newLabel:hover {background-color: #ddffdd}

ul.square {list-style-type: square}

.inline-control-link {
    background: #ffc;
    font-size: 9px;
    color: #666;
    padding: 2px;
    text-transform: uppercase;
    text-decoration: none;
}


.inline-control-link a:link {text-decoration: none}
.inline-control-link a:active {text-decoration: none}
.inline-control-link a:visited {text-decoration: none}
.inline-control-link a:hover {text-decoration: none}

.inline-control-link {
    background: #ffc;
    font-size: 9px;
    color: #666;
    padding: 2px;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
}

div.auto_complete {
    width: 350px;
    background: #fff;
}
div.auto_complete ul {
    border: 1px solid #888;
    margin: 0;
    padding: 0;
    width: 100%;
    list-style-type: none;
}
div.auto_complete ul li {
    margin: 0;
    padding: 3px;
}
div.auto_complete ul li.selected {
    background-color: #ffb;
}
div.auto_complete ul strong.highlight {
    color: #800;
    margin: 0;
    padding: 0;
}

/******* Edit Page Styles *******/
.toogleFormDiv{
    border:1px solid #A7A6AA;
    background-color:white;
    padding:5px;
    margin-top: 5px;
}

.toogleInfoDiv{
    border:1px solid #A7A6AA;
    background-color:white;
    display:none;
    padding:5px;
    margin-top: 10px;
}

.inputSection{
    margin-bottom:20px;
}

#editBox{
   border:1px solid lightgray;
   background-color:#F0F0F0;
}

/******* Left Navigation Theme Styles ********/
.leftnav li a {
    text-decoration:none;
    color:white;
    margin:0px;
    display:block;
    padding:2px;
    padding-left:5px;
    background-color: #3c78b5;
    border-top:1px solid #3c78b5;
}

.leftnav li a:active {color:white;}
.leftnav li a:visited {color:white;}
.leftnav li a:hover {background-color: #003366; color:white;}

/* Added by Shaun during i18n */
.replaced
{
    background-color: #33CC66;
}

.topPadding
{
    margin-top: 20px;
}

/* new form style */
.form-block {
    padding: 6px;
}
.form-error-block {
    padding: 6px;
    background: #fcc;
    border-top: #f0f0f0 1px solid;
    border-bottom: #f0f0f0 1px solid;
    margin-bottom: 6px;
    padding: 0 12px 0 12px;
}
.form-element-large {
    font-size: 16px;
    font-weight: bold;
    font-family: Arial, sans-serif;
    color: #003366;
}

.form-element-small {
    font-size: 12px;
    font-weight: bold;
    font-family: Arial, sans-serif;
    color: #003366;
}

.form-header {
    background: lightyellow;
    border-top: #f0f0f0 1px solid;
    border-bottom: #f0f0f0 1px solid;
    margin-bottom: 6px;
    padding: 0 12px 0 12px;
}
.form-header p, .form-block p, .form-error-block p {
    line-height: normal;
    margin: 12px 0 12px 0;
}
.form-example {
    color: #888;
    font-size: 11px;
}
.form-divider {
    border-bottom: #ccc 1px solid;
    margin-bottom: 6px;
}
.form-buttons {
    margin-top: 6px;
    border-top: #ccc 1px solid;
    border-bottom: #ccc 1px solid;
    background: #f0f0f0;
    padding: 10px;
    text-align: center;
}
.form-buttons input {
    width: 100px;
}
.form-block .error {
    padding: 6px;
    margin-bottom: 6px;
}
    -->
    </style>
</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/FELIX">FELIX</a>
:
            <a href="http://cwiki.apache.org/confluence/display/FELIX/Service+Component+Runtime+Tutorial">Service
Component Runtime Tutorial</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/FELIX/Service+Component+Runtime+Tutorial">Service
Component Runtime Tutorial</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~fmeschbe">Felix
Meschberger</a>
            <span class="smallfont">(Aug 30, 2007)</span>.
     </p>
    <p>
      Change summary:
      <div class="greybox wiki-content"><p>Add section to refer to the Maven SCR
Plugin</p></div>
    </p>
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=7967&originalVersion=5&revisedVersion=6">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><div>[ <a href='#ServiceComponentRuntimeTutorial-Example'>Example</a>
] [ <a href='#ServiceComponentRuntimeTutorial-Component'>Component</a> ] [ <a
href='#ServiceComponentRuntimeTutorial-Declaration'>Declaration</a> ] [ <a href='#ServiceComponentRuntimeTutorial-Activation'>Activation</a>
] [ <a href='#ServiceComponentRuntimeTutorial-ServiceBinding'>Service Binding</a>
] [ <a href='#ServiceComponentRuntimeTutorial-LookinguptheService'>Looking up the Service</a>
] [ <a href='#ServiceComponentRuntimeTutorial-ReceivingtheService'>Receiving the Service</a>
] [ <a href='#ServiceComponentRuntimeTutorial-MavenSCRPlugin'>Maven SCR Plugin</a>
] [ <a href='#ServiceComponentRuntimeTutorial-Summary'>Summary</a> ]</div>

<p>The Apache Felix Service Component Runtime described by the OSGi Desclarative Services
Specification is implemented by the <tt>org.apache.felix.scr</tt> bundle. As specified,
the components must be declared in XML-formatted descriptor files which in turn must be listed
in the <tt>Service-Component</tt> header of the declaring bundle.</p>

<p>The component declarations are read when the declaring bundle is started and the
respective components are verified and activated depending on their declaration.</p>

<h2><a name="ServiceComponentRuntimeTutorial-Example"></a>Example</h2>

<p>To help you get a head start, here is an example of using Declarative Services. You
will find more examples in the <tt>trunk/examples</tt> folder of the Apache Felix
Project.</p>

<h2><a name="ServiceComponentRuntimeTutorial-Component"></a>Component</h2>

<p>First of all the component must be implemented in a simple Java class. The Declarative
Services Specification basically places no restrictions on the contents of this class. If
you make use of advanced functionality such as providing an <tt>activate()</tt>
or <tt>deactivate()</tt> method or using service loopup by <em>event strategy</em>
(see 112.3.1 Accessing Services) you will of course have to provide the respective methods.</p>

<p>For the sake of example, lets define a very simple class, which implements a <tt>java.util.Comparator</tt>
service:</p>

<div class="code"><div class="codeHeader"><b>sample/SampleComparator.java</b></div><div
class="codeContent">
<pre class="code-java"><span class="code-keyword">package</span> sample;
<span class="code-keyword">import</span> java.util.Comparator;
<span class="code-keyword">public</span> class SampleComparator <span class="code-keyword">implements</span>
Comparator
{
    <span class="code-keyword">public</span> <span class="code-object">int</span>
compare( <span class="code-object">Object</span> o1, <span class="code-object">Object</span>
o2 )
    {
        <span class="code-comment">// TODO: calculate the result
</span>        <span class="code-keyword">return</span> o1.equals( o2 )
? 0 : -1;
    }
}</pre>
</div></div>

<p>This is of course a very simple and not very intelligently implemented comparator...</p>

<h2><a name="ServiceComponentRuntimeTutorial-Declaration"></a>Declaration</h2>

<p>The next step consists of writing the declaration. I usually put these files in the
<tt>OSGI-INF</tt> folder of the bundle, but the files may be placed anywhere within
the bundle or any of the bundle's fragments as long as its path is listed in the <tt>Service-Component</tt>
bundle manifest header.</p>

<p>So here we go with the file:</p>

<div class="code"><div class="codeHeader"><b>OSGI-INF/sample.xml</b></div><div
class="codeContent">
<pre class="code-java">&lt;?xml version=<span class="code-quote">"1.0"</span>
encoding=<span class="code-quote">"UTF-8"</span>?&gt;
&lt;component name=<span class="code-quote">"sample.component"</span> immediate=<span
class="code-quote">"<span class="code-keyword">true</span>"</span>&gt;
  &lt;implementation class=<span class="code-quote">"sample.SampleComparator"</span>
/&gt;
  &lt;property name=<span class="code-quote">"service.description"</span>
value=<span class="code-quote">"Sample Comparator Service"</span> /&gt;
  &lt;property name=<span class="code-quote">"service.vendor"</span> value=<span
class="code-quote">"Apache Software Foundation"</span> /&gt;
  &lt;service&gt;
    &lt;provide <span class="code-keyword">interface</span>=<span class="code-quote">"java.util.Comparator"</span>
/&gt;
  &lt;/service&gt;
&lt;/component&gt;</pre>
</div></div>

<p>There are some noteworthy settings in this descriptor already:</p>

<ul>
	<li><b>name</b> - Uniquely identifies this component and is also used to
retrieve optional configuration from the Configuration Admin Service (if available).</li>
	<li><b>immediate</b> - Defines whether the component is to be instantiated
immediately (<tt>true</tt>) or on-demand (<tt>false</tt>).</li>
	<li><b>implementation.class</b> - The fully qualified name of the class
implementing the component. This class must be public and have a public default constructor
for it to be usable by the Service Component Runtime. This class is not required to be exported
and may as well be private to the bundle. In fact, you will generally not export the component
implementation class.</li>
	<li><b>property</b> - These elements define configuration properties to
the component. These properties are available through the <tt>ComponentContext</tt>
which is presented to the component in the <tt>activate</tt> method (see below).</li>
	<li><b>service</b> - If the component is to be registered as a service,
the service names are listed in <b>provide</b> elements inside the <b>service</b>
element. These names will generally be interfaces and must be visible to other bundles for
the service to be usable. In this sample, the service is the Java <tt>java.util.Comparator</tt>
class, which is always visible.</li>
</ul>


<p>To finalize this declaration, add the following header to the bundle manifest:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">Service-Component = OSGI-INF/sample.xml</pre>
</div></div>

<h2><a name="ServiceComponentRuntimeTutorial-Activation"></a>Activation</h2>

<p>It may well be that the component needs to be notified, when it is activated and
deactivated. For this, the component may implement an <tt>activate</tt> method
and a <tt>deactivate</tt> method. Both methods must be <tt>public</tt>
or <tt>protected</tt> and take a single argument, the <tt>org.osgi.service.ComponentContext</tt>.
It is recommended for this method to the <tt>protected</tt> as it is only used
by the Service Component Runtime and should of course not be part of the public API of the
component.</p>

<p>Here is the initial class extended with activation and deactivation methods:</p>

<div class="code"><div class="codeHeader"><b>sample/SampleComparator.java</b></div><div
class="codeContent">
<pre class="code-java"><span class="code-keyword">package</span> sample;
<span class="code-keyword">import</span> java.util.Comparator;
<span class="code-keyword">import</span> org.osgi.service.component.ComponentContext;
<span class="code-keyword">public</span> class SampleComparator <span class="code-keyword">implements</span>
Comparator
{
    <span class="code-keyword">public</span> <span class="code-object">int</span>
compare( <span class="code-object">Object</span> o1, <span class="code-object">Object</span>
o2 )
    {
        <span class="code-comment">// TODO: calculate the result
</span>        <span class="code-keyword">return</span> o1.equals( o2 )
? 0 : -1;
    }

    <span class="code-keyword">protected</span> void activate(ComponentContext
context)
    {
        <span class="code-comment">// TODO: Do something on activation
</span>    }
    
    <span class="code-keyword">protected</span> void deactivate(ComponentContext
context)
    {
        <span class="code-comment">// TODO: Do something on deactivation
</span>    }
}</pre>
</div></div>

<p>Nothing more needs to be done as the Service Component Runtime automatically recognizes
and calls these methods.</p>

<h2><a name="ServiceComponentRuntimeTutorial-ServiceBinding"></a>Service
Binding</h2>

<p>The next step would probably be to do some service binding. This is somewhat more
overhead, as the referred to services must be declared. On the other hand, you do not have
to care to listen for these services. As examples of these strategies we will first use the
lookup strategy to access an OSGi <tt>HttpService</tt> and then we will use the
event strategy to access an OSGi <tt>LogService</tt> (I personally prefer the
event strategy, but your mileage may vary).</p>

<h3><a name="ServiceComponentRuntimeTutorial-LookinguptheService"></a>Looking
up the Service</h3>

<p>To use the service, the reference must be declared in the service declaration in
an <b>reference</b> element. Here is the respective declaration for a log service
to lookup:</p>

<div class="code"><div class="codeHeader"><b>LogService Reference</b></div><div
class="codeContent">
<pre class="code-java">&lt;component...&gt;
   ...
    &lt;reference name=<span class="code-quote">"http"</span>
        <span class="code-keyword">interface</span>=<span class="code-quote">"org.osgi.service.http.HttpService"</span>
        cardinality=<span class="code-quote">"1..1"</span> 
        policy=<span class="code-quote">"<span class="code-keyword">static</span>"</span>
    /&gt;
   ...
&lt;/component&gt;</pre>
</div></div>

<p>To use this service you call the <tt>ComponentContext.getService(String)</tt>
method, for example in the <tt>activate</tt> method:</p>

<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">protected</span> void
activate(ComponentContext context)
{
    HttpService http = ( HttpService ) context.locateService( <span class="code-quote">"http"</span>
);
}</pre>
</div></div>

<h3><a name="ServiceComponentRuntimeTutorial-ReceivingtheService"></a>Receiving
the Service</h3>

<p>The event strategy works by declaring bind and unbind methods in the component descriptor.
These methods take a single parameter of the type defined in the <b>reference.interface</b>
attribute and must be declared <tt>public</tt> or <tt>protected</tt>.
As with the <tt>activate</tt> and <tt>deactive</tt> it is recommended
for the bind and unbind methods to be declared <tt>protected</tt> as they are
generally not part of the public API of the component.</p>

<p>When using the event strategy, you will want to store the service in a private field
of the component for later use.</p>

<p>First here is the reference declaration:</p>

<div class="code"><div class="codeHeader"><b>LogService Reference</b></div><div
class="codeContent">
<pre class="code-java">&lt;component...&gt;
   ...
   &lt;reference name=<span class="code-quote">"log"</span>
         <span class="code-keyword">interface</span>=<span class="code-quote">"org.osgi.service.log.LogService"</span>
         cardinality=<span class="code-quote">"1..1"</span>
         policy=<span class="code-quote">"<span class="code-keyword">static</span>"</span>
         bind=<span class="code-quote">"bindLog"</span>
         unbind=<span class="code-quote">"unbindLog"</span>
   /&gt;
   ...
&lt;/component&gt;</pre>
</div></div>

<p>And here is some code:</p>

<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">private</span> LogService
log;

<span class="code-keyword">protected</span> void activate(ComponentContext context)
{
    log.log(LogService.LOG_INFO, <span class="code-quote">"Hello Components!"</span>);
}

<span class="code-keyword">protected</span> void bindLog(LogService log)
{
    <span class="code-keyword">this</span>.log = log;
}

<span class="code-keyword">protected</span> void unbindLog(LogService log)
{
    <span class="code-keyword">this</span>.log = <span class="code-keyword">null</span>;
}</pre>
</div></div>

<p>Note, that you may refer to the <tt>log</tt> field in the <tt>activate</tt>
method as we declared the reference as required. In this case the reference is provided to
the component in the <tt>bind</tt> method before the <tt>activate</tt>
method is called.</p>


<h2><a name="ServiceComponentRuntimeTutorial-MavenSCRPlugin"></a>Maven SCR
Plugin</h2>

<p>To simplify the tasks of generating the SCR Desriptor and adding the <tt>Service-Component</tt>
header to the bundle manifest, the <a href="/confluence/display/FELIX/Maven+SCR+Plugin"
title="Maven SCR Plugin">Maven SCR Plugin</a> may be used. This helps keeping the
descriptor and the code in sync especially during development.</p>


<h2><a name="ServiceComponentRuntimeTutorial-Summary"></a>Summary</h2>

<p>This tutorial just listed some very basic information on Declarative Service. To
get more information, for example on hoe the Configuration Admin Service may be used to configure
components, refer to the Declarative Services Sepecification in the OSGi Service Platform
<em>Service Compendium</em> book.</p>

<p>Have Fun !</p></div>


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