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<div class="subTitle">org.osgi.util.tracker</div>
<h2 title="Interface ServiceTrackerCustomizer" class="title">Interface ServiceTrackerCustomizer<S,T></h2>
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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 Known Implementing Classes:</dt>
<dd><a href="../../../../org/osgi/util/tracker/ServiceTracker.html" title="class in org.osgi.util.tracker">ServiceTracker</a></dd>
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<pre>@ConsumerType
public interface <span class="strong">ServiceTrackerCustomizer<S,T></span></pre>
<div class="block">The <code>ServiceTrackerCustomizer</code> interface allows a
<code>ServiceTracker</code> to customize the service objects that are tracked. A
<code>ServiceTrackerCustomizer</code> is called when a service is being added to a
<code>ServiceTracker</code>. The <code>ServiceTrackerCustomizer</code> can then return
an object for the tracked service. A <code>ServiceTrackerCustomizer</code> is also
called when a tracked service is modified or has been removed from a
<code>ServiceTracker</code>.
<p>
The methods in this interface may be called as the result of a
<code>ServiceEvent</code> being received by a <code>ServiceTracker</code>. Since
<code>ServiceEvent</code>s are synchronously delivered by the Framework, it is
highly recommended that implementations of these methods do not register (
<code>BundleContext.registerService</code>), modify (
<code>ServiceRegistration.setProperties</code>) or unregister (
<code>ServiceRegistration.unregister</code>) a service while being synchronized on
any object.
<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>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">T</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.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/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">S</a>> reference)</code>
<div class="block">A service is being added to the <code>ServiceTracker</code>.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.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/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">S</a>> reference,
<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">T</a> service)</code>
<div class="block">A service tracked by the <code>ServiceTracker</code> has been modified.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.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/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">S</a>> reference,
<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">T</a> service)</code>
<div class="block">A service tracked by the <code>ServiceTracker</code> has been removed.</div>
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<h4>addingService</h4>
<pre><a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">T</a> addingService(<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">S</a>> reference)</pre>
<div class="block">A service is being added to the <code>ServiceTracker</code>.
<p>
This method is called before a service which matched the search
parameters of the <code>ServiceTracker</code> is added to the
<code>ServiceTracker</code>. This method should return the service object to
be tracked for the specified <code>ServiceReference</code>. The returned
service object is stored in the <code>ServiceTracker</code> and is available
from the <code>getService</code> and <code>getServices</code> methods.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>reference</code> - The reference to the service being added to the
<code>ServiceTracker</code>.</dd>
<dt><span class="strong">Returns:</span></dt><dd>The service object to be tracked for the specified referenced
service or <code>null</code> if the specified referenced service
should not be tracked.</dd></dl>
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<h4>modifiedService</h4>
<pre>void modifiedService(<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">S</a>> reference,
<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">T</a> service)</pre>
<div class="block">A service tracked by the <code>ServiceTracker</code> has been modified.
<p>
This method is called when a service being tracked by the
<code>ServiceTracker</code> has had it properties modified.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>reference</code> - The reference to the service that has been modified.</dd><dd><code>service</code> - The service object for the specified referenced service.</dd></dl>
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<h4>removedService</h4>
<pre>void removedService(<a href="../../../../org/osgi/framework/ServiceReference.html" title="interface in org.osgi.framework">ServiceReference</a><<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">S</a>> reference,
<a href="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">T</a> service)</pre>
<div class="block">A service tracked by the <code>ServiceTracker</code> has been removed.
<p>
This method is called after a service is no longer being tracked by the
<code>ServiceTracker</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>reference</code> - The reference to the service that has been removed.</dd><dd><code>service</code> - The service object for the specified referenced service.</dd></dl>
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