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ServiceTracker
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org.osgi.util.tracker</FONT>
<BR>
Class ServiceTracker<S,T></H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.osgi.util.tracker.ServiceTracker<S,T></B>
</PRE>
<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 Implemented Interfaces:</B> <DD><A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</A><S,T></DD>
</DL>
<HR>
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<DT><PRE>public class <B>ServiceTracker<S,T></B><DT>extends java.lang.Object<DT>implements <A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html" title="interface in org.osgi.util.tracker">ServiceTrackerCustomizer</A><S,T></DL>
</PRE>
<P>
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.
<P>
<P>
<HR>
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<CODE>protected org.osgi.framework.BundleContext</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#context">context</A></B></CODE>
<BR>
The Bundle Context used by this <code>ServiceTracker</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected org.osgi.framework.Filter</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#filter">filter</A></B></CODE>
<BR>
The Filter used by this <code>ServiceTracker</code> which specifies the
search criteria for the services to track.</TD>
</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#ServiceTracker(org.osgi.framework.BundleContext, java.lang.Class, org.osgi.util.tracker.ServiceTrackerCustomizer)">ServiceTracker</A></B>(org.osgi.framework.BundleContext 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>
<BR>
Create a <code>ServiceTracker</code> on the specified class.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#ServiceTracker(org.osgi.framework.BundleContext, org.osgi.framework.Filter, org.osgi.util.tracker.ServiceTrackerCustomizer)">ServiceTracker</A></B>(org.osgi.framework.BundleContext context,
org.osgi.framework.Filter 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>
<BR>
Create a <code>ServiceTracker</code> on the specified <code>Filter</code>
object.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#ServiceTracker(org.osgi.framework.BundleContext, org.osgi.framework.ServiceReference, org.osgi.util.tracker.ServiceTrackerCustomizer)">ServiceTracker</A></B>(org.osgi.framework.BundleContext context,
org.osgi.framework.ServiceReference<<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>
<BR>
Create a <code>ServiceTracker</code> on the specified
<code>ServiceReference</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#ServiceTracker(org.osgi.framework.BundleContext, java.lang.String, org.osgi.util.tracker.ServiceTrackerCustomizer)">ServiceTracker</A></B>(org.osgi.framework.BundleContext 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>
<BR>
Create a <code>ServiceTracker</code> on the specified class name.</TD>
</TR>
</TABLE>
<!-- ========== METHOD SUMMARY =========== -->
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<B>Method Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#addingService(org.osgi.framework.ServiceReference)">addingService</A></B>(org.osgi.framework.ServiceReference<<A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</A>> reference)</CODE>
<BR>
Default implementation of the
<code>ServiceTrackerCustomizer.addingService</code> method.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#close()">close</A></B>()</CODE>
<BR>
Close this <code>ServiceTracker</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#getService()">getService</A></B>()</CODE>
<BR>
Returns a service object for one of the services being tracked by this
<code>ServiceTracker</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#getService(org.osgi.framework.ServiceReference)">getService</A></B>(org.osgi.framework.ServiceReference<<A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</A>> reference)</CODE>
<BR>
Returns the service object for the specified
<code>ServiceReference</code> if the specified referenced service is
being tracked by this <code>ServiceTracker</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> org.osgi.framework.ServiceReference<<A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</A>></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#getServiceReference()">getServiceReference</A></B>()</CODE>
<BR>
Returns a <code>ServiceReference</code> for one of the services being
tracked by this <code>ServiceTracker</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> org.osgi.framework.ServiceReference<<A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</A>>[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#getServiceReferences()">getServiceReferences</A></B>()</CODE>
<BR>
Return an array of <code>ServiceReference</code>s for all services being
tracked by this <code>ServiceTracker</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#getServices()">getServices</A></B>()</CODE>
<BR>
Return an array of service objects for all services being tracked by this
<code>ServiceTracker</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</A>[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#getServices(T[])">getServices</A></B>(<A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</A>[] array)</CODE>
<BR>
Return an array of service objects for all services being tracked by this
<code>ServiceTracker</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.util.SortedMap<org.osgi.framework.ServiceReference<<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></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#getTracked()">getTracked</A></B>()</CODE>
<BR>
Return a <code>SortedMap</code> of the <code>ServiceReference</code>s and
service objects for all services being tracked by this
<code>ServiceTracker</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#getTrackingCount()">getTrackingCount</A></B>()</CODE>
<BR>
Returns the tracking count for this <code>ServiceTracker</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#isEmpty()">isEmpty</A></B>()</CODE>
<BR>
Return if this <code>ServiceTracker</code> is empty.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#modifiedService(org.osgi.framework.ServiceReference, T)">modifiedService</A></B>(org.osgi.framework.ServiceReference<<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>
<BR>
Default implementation of the
<code>ServiceTrackerCustomizer.modifiedService</code> method.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#open()">open</A></B>()</CODE>
<BR>
Open this <code>ServiceTracker</code> and begin tracking services.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#open(boolean)">open</A></B>(boolean trackAllServices)</CODE>
<BR>
Open this <code>ServiceTracker</code> and begin tracking services.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#remove(org.osgi.framework.ServiceReference)">remove</A></B>(org.osgi.framework.ServiceReference<<A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</A>> reference)</CODE>
<BR>
Remove a service from this <code>ServiceTracker</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#removedService(org.osgi.framework.ServiceReference, T)">removedService</A></B>(org.osgi.framework.ServiceReference<<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>
<BR>
Default implementation of the
<code>ServiceTrackerCustomizer.removedService</code> method.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#size()">size</A></B>()</CODE>
<BR>
Return the number of services being tracked by this
<code>ServiceTracker</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#waitForService(long)">waitForService</A></B>(long timeout)</CODE>
<BR>
Wait for at least one service to be tracked by this
<code>ServiceTracker</code>.</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
<P>
<!-- ============ FIELD DETAIL =========== -->
<A NAME="field_detail"><!-- --></A>
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<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Field Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="context"><!-- --></A><H3>
context</H3>
<PRE>
protected final org.osgi.framework.BundleContext <B>context</B></PRE>
<DL>
<DD>The Bundle Context used by this <code>ServiceTracker</code>.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="filter"><!-- --></A><H3>
filter</H3>
<PRE>
protected final org.osgi.framework.Filter <B>filter</B></PRE>
<DL>
<DD>The Filter used by this <code>ServiceTracker</code> which specifies the
search criteria for the services to track.
<P>
<DL>
<DT><B>Since:</B></DT>
<DD>1.1</DD>
</DL>
</DL>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
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</TR>
</TABLE>
<A NAME="ServiceTracker(org.osgi.framework.BundleContext, org.osgi.framework.ServiceReference, org.osgi.util.tracker.ServiceTrackerCustomizer)"><!-- --></A><H3>
ServiceTracker</H3>
<PRE>
public <B>ServiceTracker</B>(org.osgi.framework.BundleContext context,
org.osgi.framework.ServiceReference<<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>
<DL>
<DD>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>.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - The <code>BundleContext</code> against which the tracking
is done.<DD><CODE>reference</CODE> - The <code>ServiceReference</code> for the service to be
tracked.<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.</DL>
</DL>
<HR>
<A NAME="ServiceTracker(org.osgi.framework.BundleContext, java.lang.String, org.osgi.util.tracker.ServiceTrackerCustomizer)"><!-- --></A><H3>
ServiceTracker</H3>
<PRE>
public <B>ServiceTracker</B>(org.osgi.framework.BundleContext 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>
<DL>
<DD>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>.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - The <code>BundleContext</code> against which the tracking
is done.<DD><CODE>clazz</CODE> - The class name of the services to be tracked.<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.</DL>
</DL>
<HR>
<A NAME="ServiceTracker(org.osgi.framework.BundleContext, org.osgi.framework.Filter, org.osgi.util.tracker.ServiceTrackerCustomizer)"><!-- --></A><H3>
ServiceTracker</H3>
<PRE>
public <B>ServiceTracker</B>(org.osgi.framework.BundleContext context,
org.osgi.framework.Filter 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>
<DL>
<DD>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>.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - The <code>BundleContext</code> against which the tracking
is done.<DD><CODE>filter</CODE> - The <code>Filter</code> to select the services to be
tracked.<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.<DT><B>Since:</B></DT>
<DD>1.1</DD>
</DL>
</DL>
<HR>
<A NAME="ServiceTracker(org.osgi.framework.BundleContext, java.lang.Class, org.osgi.util.tracker.ServiceTrackerCustomizer)"><!-- --></A><H3>
ServiceTracker</H3>
<PRE>
public <B>ServiceTracker</B>(org.osgi.framework.BundleContext 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>
<DL>
<DD>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>.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - The <code>BundleContext</code> against which the tracking
is done.<DD><CODE>clazz</CODE> - The class of the services to be tracked.<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.<DT><B>Since:</B></DT>
<DD>1.5</DD>
</DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="open()"><!-- --></A><H3>
open</H3>
<PRE>
public void <B>open</B>()</PRE>
<DL>
<DD>Open this <code>ServiceTracker</code> and begin tracking services.
<p>
This implementation calls <code>open(false)</code>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - If the <code>BundleContext</code>
with which this <code>ServiceTracker</code> was created is no
longer valid.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#open(boolean)"><CODE>open(boolean)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="open(boolean)"><!-- --></A><H3>
open</H3>
<PRE>
public void <B>open</B>(boolean trackAllServices)</PRE>
<DL>
<DD>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>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><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>.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - If the <code>BundleContext</code>
with which this <code>ServiceTracker</code> was created is no
longer valid.<DT><B>Since:</B></DT>
<DD>1.3</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="close()"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</B>()</PRE>
<DL>
<DD>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.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="addingService(org.osgi.framework.ServiceReference)"><!-- --></A><H3>
addingService</H3>
<PRE>
public <A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</A> <B>addingService</B>(org.osgi.framework.ServiceReference<<A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</A>> reference)</PRE>
<DL>
<DD>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, T)"><CODE>removedService</CODE></A> to unget
the service.
<P>
<DD><DL>
<DT><B>Specified by:</B><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></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>reference</CODE> - The reference to the service being added to this
<code>ServiceTracker</code>.
<DT><B>Returns:</B><DD>The service object to be tracked for the service added to this
<code>ServiceTracker</code>.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#addingService(org.osgi.framework.ServiceReference)"><CODE>ServiceTrackerCustomizer.addingService(ServiceReference)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="modifiedService(org.osgi.framework.ServiceReference,java.lang.Object)"><!-- --></A><A NAME="modifiedService(org.osgi.framework.ServiceReference, T)"><!-- --></A><H3>
modifiedService</H3>
<PRE>
public void <B>modifiedService</B>(org.osgi.framework.ServiceReference<<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>
<DL>
<DD>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.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#modifiedService(org.osgi.framework.ServiceReference, T)">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></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>reference</CODE> - The reference to modified service.<DD><CODE>service</CODE> - The service object for the modified service.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#modifiedService(org.osgi.framework.ServiceReference, T)"><CODE>ServiceTrackerCustomizer.modifiedService(ServiceReference, Object)</CODE></A></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>
public void <B>removedService</B>(org.osgi.framework.ServiceReference<<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>
<DL>
<DD>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.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#removedService(org.osgi.framework.ServiceReference, T)">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></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>reference</CODE> - The reference to removed service.<DD><CODE>service</CODE> - The service object for the removed service.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/util/tracker/ServiceTrackerCustomizer.html#removedService(org.osgi.framework.ServiceReference, T)"><CODE>ServiceTrackerCustomizer.removedService(ServiceReference, Object)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="waitForService(long)"><!-- --></A><H3>
waitForService</H3>
<PRE>
public <A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</A> <B>waitForService</B>(long timeout)
throws java.lang.InterruptedException</PRE>
<DL>
<DD>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.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>timeout</CODE> - The time interval in milliseconds to wait. If zero, the
method will wait indefinitely.
<DT><B>Returns:</B><DD>Returns the result of <A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html#getService()"><CODE>getService()</CODE></A>.
<DT><B>Throws:</B>
<DD><CODE>java.lang.InterruptedException</CODE> - If another thread has interrupted the
current thread.
<DD><CODE>java.lang.IllegalArgumentException</CODE> - If the value of timeout is negative.</DL>
</DD>
</DL>
<HR>
<A NAME="getServiceReferences()"><!-- --></A><H3>
getServiceReferences</H3>
<PRE>
public org.osgi.framework.ServiceReference<<A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</A>>[] <B>getServiceReferences</B>()</PRE>
<DL>
<DD>Return an array of <code>ServiceReference</code>s for all services being
tracked by this <code>ServiceTracker</code>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>Array of <code>ServiceReference</code>s or <code>null</code> if
no services are being tracked.</DL>
</DD>
</DL>
<HR>
<A NAME="getServiceReference()"><!-- --></A><H3>
getServiceReference</H3>
<PRE>
public org.osgi.framework.ServiceReference<<A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</A>> <B>getServiceReference</B>()</PRE>
<DL>
<DD>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.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>A <code>ServiceReference</code> or <code>null</code> if no
services are being tracked.<DT><B>Since:</B></DT>
<DD>1.1</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="getService(org.osgi.framework.ServiceReference)"><!-- --></A><H3>
getService</H3>
<PRE>
public <A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</A> <B>getService</B>(org.osgi.framework.ServiceReference<<A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</A>> reference)</PRE>
<DL>
<DD>Returns the service object for the specified
<code>ServiceReference</code> if the specified referenced service is
being tracked by this <code>ServiceTracker</code>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>reference</CODE> - The reference to the desired service.
<DT><B>Returns:</B><DD>A service object or <code>null</code> if the service referenced
by the specified <code>ServiceReference</code> is not being
tracked.</DL>
</DD>
</DL>
<HR>
<A NAME="getServices()"><!-- --></A><H3>
getServices</H3>
<PRE>
public java.lang.Object[] <B>getServices</B>()</PRE>
<DL>
<DD>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.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>An array of service objects or <code>null</code> if no services
are being tracked.</DL>
</DD>
</DL>
<HR>
<A NAME="getService()"><!-- --></A><H3>
getService</H3>
<PRE>
public <A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</A> <B>getService</B>()</PRE>
<DL>
<DD>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>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>A service object or <code>null</code> if no services are being
tracked.</DL>
</DD>
</DL>
<HR>
<A NAME="remove(org.osgi.framework.ServiceReference)"><!-- --></A><H3>
remove</H3>
<PRE>
public void <B>remove</B>(org.osgi.framework.ServiceReference<<A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">S</A>> reference)</PRE>
<DL>
<DD>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.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>reference</CODE> - The reference to the service to be removed.</DL>
</DD>
</DL>
<HR>
<A NAME="size()"><!-- --></A><H3>
size</H3>
<PRE>
public int <B>size</B>()</PRE>
<DL>
<DD>Return the number of services being tracked by this
<code>ServiceTracker</code>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>The number of services being tracked.</DL>
</DD>
</DL>
<HR>
<A NAME="getTrackingCount()"><!-- --></A><H3>
getTrackingCount</H3>
<PRE>
public int <B>getTrackingCount</B>()</PRE>
<DL>
<DD>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.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>The tracking count for this <code>ServiceTracker</code> or -1 if this
<code>ServiceTracker</code> is not open.<DT><B>Since:</B></DT>
<DD>1.2</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="getTracked()"><!-- --></A><H3>
getTracked</H3>
<PRE>
public java.util.SortedMap<org.osgi.framework.ServiceReference<<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>> <B>getTracked</B>()</PRE>
<DL>
<DD>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.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><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.<DT><B>Since:</B></DT>
<DD>1.5</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="isEmpty()"><!-- --></A><H3>
isEmpty</H3>
<PRE>
public boolean <B>isEmpty</B>()</PRE>
<DL>
<DD>Return if this <code>ServiceTracker</code> is empty.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD><code>true</code> if this <code>ServiceTracker</code> is not tracking any
services.<DT><B>Since:</B></DT>
<DD>1.5</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="getServices(java.lang.Object[])"><!-- --></A><A NAME="getServices(T[])"><!-- --></A><H3>
getServices</H3>
<PRE>
public <A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</A>[] <B>getServices</B>(<A HREF="../../../../org/osgi/util/tracker/ServiceTracker.html" title="type parameter in ServiceTracker">T</A>[] array)</PRE>
<DL>
<DD>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.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>array</CODE> - An array into which the tracked service objects will be
stored, if the array is large enough.
<DT><B>Returns:</B><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.<DT><B>Since:</B></DT>
<DD>1.5</DD>
</DL>
</DD>
</DL>
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