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<div class="subTitle">org.osgi.util.tracker</div>
<h2 title="Class ServiceTracker" class="title">Class ServiceTracker<S,T></h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>org.osgi.util.tracker.ServiceTracker<S,T></li>
</ul>
</li>
</ul>
<div class="description">
<ul class="blockList">
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<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>S</code> - The type of the service being tracked.</dd><dd><code>T</code> - The type of the tracked object.</dd></dl>
<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</a><S,T></dd>
</dl>
<hr>
<br>
<pre>public class <span class="strong">ServiceTracker<S,T></span>
extends java.lang.Object
implements <a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</a><S,T></pre>
<div class="block">The <code>ServiceTracker</code> class simplifies using services from the
Framework's service registry.
<p>
A <code>ServiceTracker</code> object is constructed with search criteria and a
<code>ServiceTrackerCustomizer</code> object. A <code>ServiceTracker</code> can use a
<code>ServiceTrackerCustomizer</code> to customize the service objects to be
tracked. The <code>ServiceTracker</code> can then be opened to begin tracking all
services in the Framework's service registry that match the specified search
criteria. The <code>ServiceTracker</code> correctly handles all of the details of
listening to <code>ServiceEvent</code>s and getting and ungetting services.
<p>
The <code>getServiceReferences</code> method can be called to get references to
the services being tracked. The <code>getService</code> and <code>getServices</code>
methods can be called to get the service objects for the tracked service.
<p>
The <code>ServiceTracker</code> class is thread-safe. It does not call a
<code>ServiceTrackerCustomizer</code> while holding any locks.
<code>ServiceTrackerCustomizer</code> implementations must also be thread-safe.</div>
</li>
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<h3>Field Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation">
<caption><span>Fields</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected <a href="../../../../org/osgi/framework/BundleContext.html" title="interface in org.osgi.framework">BundleContext</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#context">context</a></strong></code>
<div class="block">The Bundle Context used by this <code>ServiceTracker</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected <a href="../../../../org/osgi/framework/Filter.html" title="interface in org.osgi.framework">Filter</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#filter">filter</a></strong></code>
<div class="block">The Filter used by this <code>ServiceTracker</code> which specifies the search
criteria for the services to track.</div>
</td>
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</table>
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<h3>Constructor Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#ServiceTracker(org.osgi.framework.BundleContext,%20java.lang.Class,%20org.osgi.util.tracker.ServiceTrackerCustomizer)">ServiceTracker</a></strong>(<a href="../../../../org/osgi/framework/BundleContext.html" title="interface in org.osgi.framework">BundleContext</a> context,
java.lang.Class<<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> clazz,
<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>,<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>> customizer)</code>
<div class="block">Create a <code>ServiceTracker</code> on the specified class.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#ServiceTracker(org.osgi.framework.BundleContext,%20org.osgi.framework.Filter,%20org.osgi.util.tracker.ServiceTrackerCustomizer)">ServiceTracker</a></strong>(<a href="../../../../org/osgi/framework/BundleContext.html" title="interface in org.osgi.framework">BundleContext</a> context,
<a href="../../../../org/osgi/framework/Filter.html" title="interface in org.osgi.framework">Filter</a> filter,
<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>,<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>> customizer)</code>
<div class="block">Create a <code>ServiceTracker</code> on the specified <code>Filter</code> object.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#ServiceTracker(org.osgi.framework.BundleContext,%20org.osgi.framework.ServiceReference,%20org.osgi.util.tracker.ServiceTrackerCustomizer)">ServiceTracker</a></strong>(<a href="../../../../org/osgi/framework/BundleContext.html" title="interface in org.osgi.framework">BundleContext</a> context,
<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> reference,
<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>,<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>> customizer)</code>
<div class="block">Create a <code>ServiceTracker</code> on the specified <code>ServiceReference</code>
.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#ServiceTracker(org.osgi.framework.BundleContext,%20java.lang.String,%20org.osgi.util.tracker.ServiceTrackerCustomizer)">ServiceTracker</a></strong>(<a href="../../../../org/osgi/framework/BundleContext.html" title="interface in org.osgi.framework">BundleContext</a> context,
java.lang.String clazz,
<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>,<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>> customizer)</code>
<div class="block">Create a <code>ServiceTracker</code> on the specified class name.</div>
</td>
</tr>
</table>
</li>
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<h3>Method Summary</h3>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#addingService(org.osgi.framework.ServiceReference)">addingService</a></strong>(<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> reference)</code>
<div class="block">Default implementation of the
<code>ServiceTrackerCustomizer.addingService</code> method.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#close()">close</a></strong>()</code>
<div class="block">Close this <code>ServiceTracker</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getService()">getService</a></strong>()</code>
<div class="block">Returns a service object for one of the services being tracked by this
<code>ServiceTracker</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getService(org.osgi.framework.ServiceReference)">getService</a></strong>(<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> reference)</code>
<div class="block">Returns the service object for the specified <code>ServiceReference</code> if
the specified referenced service is being tracked by this
<code>ServiceTracker</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>></code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getServiceReference()">getServiceReference</a></strong>()</code>
<div class="block">Returns a <code>ServiceReference</code> for one of the services being tracked
by this <code>ServiceTracker</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>>[]</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getServiceReferences()">getServiceReferences</a></strong>()</code>
<div class="block">Return an array of <code>ServiceReference</code>s for all services being
tracked by this <code>ServiceTracker</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.Object[]</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getServices()">getServices</a></strong>()</code>
<div class="block">Return an array of service objects for all services being tracked by this
<code>ServiceTracker</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>[]</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getServices(T[])">getServices</a></strong>(<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>[] array)</code>
<div class="block">Return an array of service objects for all services being tracked by this
<code>ServiceTracker</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.util.SortedMap<<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>>,<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>></code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getTracked()">getTracked</a></strong>()</code>
<div class="block">Return a <code>SortedMap</code> of the <code>ServiceReference</code>s and service
objects for all services being tracked by this <code>ServiceTracker</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getTrackingCount()">getTrackingCount</a></strong>()</code>
<div class="block">Returns the tracking count for this <code>ServiceTracker</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#isEmpty()">isEmpty</a></strong>()</code>
<div class="block">Return if this <code>ServiceTracker</code> is empty.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#modifiedService(org.osgi.framework.ServiceReference,%20T)">modifiedService</a></strong>(<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> reference,
<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a> service)</code>
<div class="block">Default implementation of the
<code>ServiceTrackerCustomizer.modifiedService</code> method.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#open()">open</a></strong>()</code>
<div class="block">Open this <code>ServiceTracker</code> and begin tracking services.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#open(boolean)">open</a></strong>(boolean trackAllServices)</code>
<div class="block">Open this <code>ServiceTracker</code> and begin tracking services.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#remove(org.osgi.framework.ServiceReference)">remove</a></strong>(<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> reference)</code>
<div class="block">Remove a service from this <code>ServiceTracker</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#removedService(org.osgi.framework.ServiceReference,%20T)">removedService</a></strong>(<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> reference,
<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a> service)</code>
<div class="block">Default implementation of the
<code>ServiceTrackerCustomizer.removedService</code> method.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#size()">size</a></strong>()</code>
<div class="block">Return the number of services being tracked by this
<code>ServiceTracker</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#waitForService(long)">waitForService</a></strong>(long timeout)</code>
<div class="block">Wait for at least one service to be tracked by this
<code>ServiceTracker</code>.</div>
</td>
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<h3>Methods inherited from class java.lang.Object</h3>
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<pre>protected final <a href="../../../../org/osgi/framework/BundleContext.html" title="interface in org.osgi.framework">BundleContext</a> context</pre>
<div class="block">The Bundle Context used by this <code>ServiceTracker</code>.</div>
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<pre>protected final <a href="../../../../org/osgi/framework/Filter.html" title="interface in org.osgi.framework">Filter</a> filter</pre>
<div class="block">The Filter used by this <code>ServiceTracker</code> which specifies the search
criteria for the services to track.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.1</dd></dl>
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<pre>public ServiceTracker(<a href="../../../../org/osgi/framework/BundleContext.html" title="interface in org.osgi.framework">BundleContext</a> context,
<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> reference,
<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>,<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>> customizer)</pre>
<div class="block">Create a <code>ServiceTracker</code> on the specified <code>ServiceReference</code>
.
<p>
The service referenced by the specified <code>ServiceReference</code> will be
tracked by this <code>ServiceTracker</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>context</code> - The <code>BundleContext</code> against which the tracking is
done.</dd><dd><code>reference</code> - The <code>ServiceReference</code> for the service to be
tracked.</dd><dd><code>customizer</code> - The customizer object to call when services are added,
modified, or removed in this <code>ServiceTracker</code>. If customizer
is <code>null</code>, then this <code>ServiceTracker</code> will be used as
the <code>ServiceTrackerCustomizer</code> and this
<code>ServiceTracker</code> will call the
<code>ServiceTrackerCustomizer</code> methods on itself.</dd></dl>
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<pre>public ServiceTracker(<a href="../../../../org/osgi/framework/BundleContext.html" title="interface in org.osgi.framework">BundleContext</a> context,
java.lang.String clazz,
<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>,<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>> customizer)</pre>
<div class="block">Create a <code>ServiceTracker</code> on the specified class name.
<p>
Services registered under the specified class name will be tracked by
this <code>ServiceTracker</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>context</code> - The <code>BundleContext</code> against which the tracking is
done.</dd><dd><code>clazz</code> - The class name of the services to be tracked.</dd><dd><code>customizer</code> - The customizer object to call when services are added,
modified, or removed in this <code>ServiceTracker</code>. If customizer
is <code>null</code>, then this <code>ServiceTracker</code> will be used as
the <code>ServiceTrackerCustomizer</code> and this
<code>ServiceTracker</code> will call the
<code>ServiceTrackerCustomizer</code> methods on itself.</dd></dl>
</li>
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<pre>public ServiceTracker(<a href="../../../../org/osgi/framework/BundleContext.html" title="interface in org.osgi.framework">BundleContext</a> context,
<a href="../../../../org/osgi/framework/Filter.html" title="interface in org.osgi.framework">Filter</a> filter,
<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>,<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>> customizer)</pre>
<div class="block">Create a <code>ServiceTracker</code> on the specified <code>Filter</code> object.
<p>
Services which match the specified <code>Filter</code> object will be tracked
by this <code>ServiceTracker</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>context</code> - The <code>BundleContext</code> against which the tracking is
done.</dd><dd><code>filter</code> - The <code>Filter</code> to select the services to be tracked.</dd><dd><code>customizer</code> - The customizer object to call when services are added,
modified, or removed in this <code>ServiceTracker</code>. If customizer
is null, then this <code>ServiceTracker</code> will be used as the
<code>ServiceTrackerCustomizer</code> and this <code>ServiceTracker</code>
will call the <code>ServiceTrackerCustomizer</code> methods on itself.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.1</dd></dl>
</li>
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<pre>public ServiceTracker(<a href="../../../../org/osgi/framework/BundleContext.html" title="interface in org.osgi.framework">BundleContext</a> context,
java.lang.Class<<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> clazz,
<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>,<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>> customizer)</pre>
<div class="block">Create a <code>ServiceTracker</code> on the specified class.
<p>
Services registered under the name of the specified class will be tracked
by this <code>ServiceTracker</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>context</code> - The <code>BundleContext</code> against which the tracking is
done.</dd><dd><code>clazz</code> - The class of the services to be tracked.</dd><dd><code>customizer</code> - The customizer object to call when services are added,
modified, or removed in this <code>ServiceTracker</code>. If customizer
is <code>null</code>, then this <code>ServiceTracker</code> will be used as
the <code>ServiceTrackerCustomizer</code> and this
<code>ServiceTracker</code> will call the
<code>ServiceTrackerCustomizer</code> methods on itself.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.5</dd></dl>
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<pre>public void open()</pre>
<div class="block">Open this <code>ServiceTracker</code> and begin tracking services.
<p>
This implementation calls <code>open(false)</code>.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalStateException</code> - If the <code>BundleContext</code> with
which this <code>ServiceTracker</code> was created is no longer valid.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../org/osgi/util/tracker/ServiceTracker.html#open(boolean)"><code>open(boolean)</code></a></dd></dl>
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<pre>public void open(boolean trackAllServices)</pre>
<div class="block">Open this <code>ServiceTracker</code> and begin tracking services.
<p>
Services which match the search criteria specified when this
<code>ServiceTracker</code> was created are now tracked by this
<code>ServiceTracker</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>trackAllServices</code> - If <code>true</code>, then this <code>ServiceTracker</code>
will track all matching services regardless of class loader
accessibility. If <code>false</code>, then this <code>ServiceTracker</code>
will only track matching services which are class loader
accessible to the bundle whose <code>BundleContext</code> is used by
this <code>ServiceTracker</code>.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalStateException</code> - If the <code>BundleContext</code> with
which this <code>ServiceTracker</code> was created is no longer valid.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.3</dd></dl>
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<pre>public void close()</pre>
<div class="block">Close this <code>ServiceTracker</code>.
<p>
This method should be called when this <code>ServiceTracker</code> should end
the tracking of services.
<p>
This implementation calls <a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getServiceReferences()"><code>getServiceReferences()</code></a> to get the list
of tracked services to remove.</div>
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<pre>public <a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a> addingService(<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> reference)</pre>
<div class="block">Default implementation of the
<code>ServiceTrackerCustomizer.addingService</code> method.
<p>
This method is only called when this <code>ServiceTracker</code> has been
constructed with a <code>null ServiceTrackerCustomizer</code> argument.
<p>
This implementation returns the result of calling <code>getService</code> on
the <code>BundleContext</code> with which this <code>ServiceTracker</code> was
created passing the specified <code>ServiceReference</code>.
<p>
This method can be overridden in a subclass to customize the service
object to be tracked for the service being added. In that case, take care
not to rely on the default implementation of
<a href="../../../../org/osgi/util/tracker/ServiceTracker.html#removedService(org.osgi.framework.ServiceReference,%20T)"><code>removedService</code></a> to unget
the service.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#addingService(org.osgi.framework.ServiceReference)">addingService</a></code> in interface <code><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>,<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>reference</code> - The reference to the service being added to this
<code>ServiceTracker</code>.</dd>
<dt><span class="strong">Returns:</span></dt><dd>The service object to be tracked for the service added to this
<code>ServiceTracker</code>.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#addingService(org.osgi.framework.ServiceReference)"><code>ServiceTrackerCustomizer.addingService(ServiceReference)</code></a></dd></dl>
</li>
</ul>
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<pre>public void modifiedService(<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> reference,
<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a> service)</pre>
<div class="block">Default implementation of the
<code>ServiceTrackerCustomizer.modifiedService</code> method.
<p>
This method is only called when this <code>ServiceTracker</code> has been
constructed with a <code>null ServiceTrackerCustomizer</code> argument.
<p>
This implementation does nothing.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#modifiedService(org.osgi.framework.ServiceReference,%20T)">modifiedService</a></code> in interface <code><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>,<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>reference</code> - The reference to modified service.</dd><dd><code>service</code> - The service object for the modified service.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#modifiedService(org.osgi.framework.ServiceReference,%20T)"><code>ServiceTrackerCustomizer.modifiedService(ServiceReference, Object)</code></a></dd></dl>
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<pre>public void removedService(<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> reference,
<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a> service)</pre>
<div class="block">Default implementation of the
<code>ServiceTrackerCustomizer.removedService</code> method.
<p>
This method is only called when this <code>ServiceTracker</code> has been
constructed with a <code>null ServiceTrackerCustomizer</code> argument.
<p>
This implementation calls <code>ungetService</code>, on the
<code>BundleContext</code> with which this <code>ServiceTracker</code> was created,
passing the specified <code>ServiceReference</code>.
<p>
This method can be overridden in a subclass. If the default
implementation of <a href="../../../../org/osgi/util/tracker/ServiceTracker.html#addingService(org.osgi.framework.ServiceReference)"><code>addingService</code></a>
method was used, this method must unget the service.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#removedService(org.osgi.framework.ServiceReference,%20T)">removedService</a></code> in interface <code><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>,<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>reference</code> - The reference to removed service.</dd><dd><code>service</code> - The service object for the removed service.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#removedService(org.osgi.framework.ServiceReference,%20T)"><code>ServiceTrackerCustomizer.removedService(ServiceReference, Object)</code></a></dd></dl>
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<pre>public <a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a> waitForService(long timeout)
throws java.lang.InterruptedException</pre>
<div class="block">Wait for at least one service to be tracked by this
<code>ServiceTracker</code>. This method will also return when this
<code>ServiceTracker</code> is closed.
<p>
It is strongly recommended that <code>waitForService</code> is not used during
the calling of the <code>BundleActivator</code> methods.
<code>BundleActivator</code> methods are expected to complete in a short
period of time.
<p>
This implementation calls <a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getService()"><code>getService()</code></a> to determine if a service
is being tracked.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>timeout</code> - The time interval in milliseconds to wait. If zero, the
method will wait indefinitely.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Returns the result of <a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getService()"><code>getService()</code></a>.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.InterruptedException</code> - If another thread has interrupted the
current thread.</dd>
<dd><code>java.lang.IllegalArgumentException</code> - If the value of timeout is negative.</dd></dl>
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<pre>public <a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>>[] getServiceReferences()</pre>
<div class="block">Return an array of <code>ServiceReference</code>s for all services being
tracked by this <code>ServiceTracker</code>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Array of <code>ServiceReference</code>s or <code>null</code> if no services
are being tracked.</dd></dl>
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<pre>public <a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> getServiceReference()</pre>
<div class="block">Returns a <code>ServiceReference</code> for one of the services being tracked
by this <code>ServiceTracker</code>.
<p>
If multiple services are being tracked, the service with the highest
ranking (as specified in its <code>service.ranking</code> property) is
returned. If there is a tie in ranking, the service with the lowest
service id (as specified in its <code>service.id</code> property); that is,
the service that was registered first is returned. This is the same
algorithm used by <code>BundleContext.getServiceReference</code>.
<p>
This implementation calls <a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getServiceReferences()"><code>getServiceReferences()</code></a> to get the list
of references for the tracked services.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>A <code>ServiceReference</code> or <code>null</code> if no services are
being tracked.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.1</dd></dl>
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<h4>getService</h4>
<pre>public <a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a> getService(<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> reference)</pre>
<div class="block">Returns the service object for the specified <code>ServiceReference</code> if
the specified referenced service is being tracked by this
<code>ServiceTracker</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>reference</code> - The reference to the desired service.</dd>
<dt><span class="strong">Returns:</span></dt><dd>A service object or <code>null</code> if the service referenced by the
specified <code>ServiceReference</code> is not being tracked.</dd></dl>
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<pre>public java.lang.Object[] getServices()</pre>
<div class="block">Return an array of service objects for all services being tracked by this
<code>ServiceTracker</code>.
<p>
This implementation calls <a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getServiceReferences()"><code>getServiceReferences()</code></a> to get the list
of references for the tracked services and then calls
<a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getService(org.osgi.framework.ServiceReference)"><code>getService(ServiceReference)</code></a> for each reference to get the
tracked service object.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>An array of service objects or <code>null</code> if no services are
being tracked.</dd></dl>
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<pre>public <a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a> getService()</pre>
<div class="block">Returns a service object for one of the services being tracked by this
<code>ServiceTracker</code>.
<p>
If any services are being tracked, this implementation returns the result
of calling <code>getService(getServiceReference())</code>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>A service object or <code>null</code> if no services are being
tracked.</dd></dl>
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<h4>remove</h4>
<pre>public void remove(<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>> reference)</pre>
<div class="block">Remove a service from this <code>ServiceTracker</code>.
The specified service will be removed from this <code>ServiceTracker</code>.
If the specified service was being tracked then the
<code>ServiceTrackerCustomizer.removedService</code> method will be called for
that service.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>reference</code> - The reference to the service to be removed.</dd></dl>
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<h4>size</h4>
<pre>public int size()</pre>
<div class="block">Return the number of services being tracked by this
<code>ServiceTracker</code>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>The number of services being tracked.</dd></dl>
</li>
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<pre>public int getTrackingCount()</pre>
<div class="block">Returns the tracking count for this <code>ServiceTracker</code>.
The tracking count is initialized to 0 when this <code>ServiceTracker</code>
is opened. Every time a service is added, modified or removed from this
<code>ServiceTracker</code>, the tracking count is incremented.
<p>
The tracking count can be used to determine if this
<code>ServiceTracker</code> has added, modified or removed a service by
comparing a tracking count value previously collected with the current
tracking count value. If the value has not changed, then no service has
been added, modified or removed from this <code>ServiceTracker</code> since
the previous tracking count was collected.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>The tracking count for this <code>ServiceTracker</code> or -1 if this
<code>ServiceTracker</code> is not open.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.2</dd></dl>
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<h4>getTracked</h4>
<pre>public java.util.SortedMap<<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</a>>,<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>> getTracked()</pre>
<div class="block">Return a <code>SortedMap</code> of the <code>ServiceReference</code>s and service
objects for all services being tracked by this <code>ServiceTracker</code>.
The map is sorted in reverse natural order of <code>ServiceReference</code>.
That is, the first entry is the service with the highest ranking and the
lowest service id.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>A <code>SortedMap</code> with the <code>ServiceReference</code>s and
service objects for all services being tracked by this
<code>ServiceTracker</code>. If no services are being tracked, then
the returned map is empty.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.5</dd></dl>
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<h4>isEmpty</h4>
<pre>public boolean isEmpty()</pre>
<div class="block">Return if this <code>ServiceTracker</code> is empty.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd><code>true</code> if this <code>ServiceTracker</code> is not tracking any
services.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.5</dd></dl>
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<h4>getServices</h4>
<pre>public <a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>[] getServices(<a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</a>[] array)</pre>
<div class="block">Return an array of service objects for all services being tracked by this
<code>ServiceTracker</code>. The runtime type of the returned array is that of
the specified array.
<p>
This implementation calls <a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getServiceReferences()"><code>getServiceReferences()</code></a> to get the list
of references for the tracked services and then calls
<a href="../../../../org/osgi/util/tracker/ServiceTracker.html#getService(org.osgi.framework.ServiceReference)"><code>getService(ServiceReference)</code></a> for each reference to get the
tracked service object.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>array</code> - An array into which the tracked service objects will be
stored, if the array is large enough.</dd>
<dt><span class="strong">Returns:</span></dt><dd>An array of service objects being tracked. If the specified array
is large enough to hold the result, then the specified array is
returned. If the specified array is longer then necessary to hold
the result, the array element after the last service object is
set to <code>null</code>. If the specified array is not large enough
to hold the result, a new array is created and returned.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.5</dd></dl>
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