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ServiceTrackerCustomizer
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org.osgi.util.tracker</FONT>
<BR>
Interface ServiceTrackerCustomizer<S,T></H2>
<DL>
<DT><DT><B>Type Parameters:</B><DD><CODE>S</CODE> - The type of the service being tracked.<DD><CODE>T</CODE> - The type of the tracked object.</DL>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="class in org.osgi.util.tracker">ServiceTracker</A></DD>
</DL>
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<DT><PRE>public interface <B>ServiceTrackerCustomizer<S,T></B></DL>
</PRE>
<P>
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.
<P>
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<CODE> <A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">T</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#addingService(org.osgi.framework.ServiceReference)">addingService</A></B>(org.osgi.framework.ServiceReference<<A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">S</A>> reference)</CODE>
<BR>
A service is being added to the <code>ServiceTracker</code>.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#modifiedService(org.osgi.framework.ServiceReference, T)">modifiedService</A></B>(org.osgi.framework.ServiceReference<<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>
<BR>
A service tracked by the <code>ServiceTracker</code> has been modified.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#removedService(org.osgi.framework.ServiceReference, T)">removedService</A></B>(org.osgi.framework.ServiceReference<<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>
<BR>
A service tracked by the <code>ServiceTracker</code> has been removed.</TD>
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<A NAME="addingService(org.osgi.framework.ServiceReference)"><!-- --></A><H3>
addingService</H3>
<PRE>
<A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">T</A> <B>addingService</B>(org.osgi.framework.ServiceReference<<A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="type parameter in ServiceTrackerCustomizer">S</A>> reference)</PRE>
<DL>
<DD>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.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>reference</CODE> - The reference to the service being added to the
<code>ServiceTracker</code>.
<DT><B>Returns:</B><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.</DL>
</DD>
</DL>
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<A NAME="modifiedService(org.osgi.framework.ServiceReference,java.lang.Object)"><!-- --></A><A NAME="modifiedService(org.osgi.framework.ServiceReference, T)"><!-- --></A><H3>
modifiedService</H3>
<PRE>
void <B>modifiedService</B>(org.osgi.framework.ServiceReference<<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>
<DL>
<DD>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.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>reference</CODE> - The reference to the service that has been modified.<DD><CODE>service</CODE> - The service object for the specified referenced service.</DL>
</DD>
</DL>
<HR>
<A NAME="removedService(org.osgi.framework.ServiceReference,java.lang.Object)"><!-- --></A><A NAME="removedService(org.osgi.framework.ServiceReference, T)"><!-- --></A><H3>
removedService</H3>
<PRE>
void <B>removedService</B>(org.osgi.framework.ServiceReference<<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>
<DL>
<DD>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>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>reference</CODE> - The reference to the service that has been removed.<DD><CODE>service</CODE> - The service object for the specified referenced service.</DL>
</DD>
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