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MonitoringJob
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org.osgi.service.monitor</FONT>
<BR>
Interface MonitoringJob</H2>
<HR>
<DL>
<DT><PRE>public interface <B>MonitoringJob</B></DL>
</PRE>
<P>
A Monitoring Job is a request for scheduled or event based notifications on
update of a set of <code>StatusVariable</code>s. The job is a data structure
that holds a non-empty list of <code>StatusVariable</code> names, an
identification of the initiator of the job, and the sampling parameters.
There are two kinds of monitoring jobs: time based and change based. Time
based jobs take samples of all <code>StatusVariable</code>s with a specified
frequency. The number of samples to be taken before the job finishes may be
specified. Change based jobs are only interested in the changes of the
monitored <code>StatusVariable</code>s. In this case, the number of changes
that must take place between two notifications can be specified.
<p>
The job can be started on the <code>MonitorAdmin</code> interface. Running
the job (querying the <code>StatusVariable</code>s, listening to changes, and
sending out notifications on updates) is the task of the
<code>MonitorAdmin</code> implementation.
<p>
Whether a monitoring job keeps track dynamically of the
<code>StatusVariable</code>s it monitors is not specified. This means that if
we monitor a <code>StatusVariable</code> of a <code>Monitorable</code>
service which disappears and later reappears then it is implementation
specific whether we still receive updates of the <code>StatusVariable</code>
changes or not.
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<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/monitor/MonitoringJob.html#getInitiator()">getInitiator</A></B>()</CODE>
<BR>
Returns the identifier of the principal who initiated the job.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/monitor/MonitoringJob.html#getReportCount()">getReportCount</A></B>()</CODE>
<BR>
Returns the number of times <code>MonitorAdmin</code> will query the
<code>StatusVariable</code>s (for time based jobs), or the number of changes
of a <code>StatusVariable</code> between notifications (for change based
jobs).</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/monitor/MonitoringJob.html#getSchedule()">getSchedule</A></B>()</CODE>
<BR>
Returns the delay (in seconds) between two samples.</TD>
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<CODE> java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/monitor/MonitoringJob.html#getStatusVariableNames()">getStatusVariableNames</A></B>()</CODE>
<BR>
Returns the list of <code>StatusVariable</code> names that are the
targets of this measurement job.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/monitor/MonitoringJob.html#isLocal()">isLocal</A></B>()</CODE>
<BR>
Returns whether the job was started locally or remotely.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/monitor/MonitoringJob.html#isRunning()">isRunning</A></B>()</CODE>
<BR>
Returns whether the job is running.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/monitor/MonitoringJob.html#stop()">stop</A></B>()</CODE>
<BR>
Stops a Monitoring Job.</TD>
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<A NAME="stop()"><!-- --></A><H3>
stop</H3>
<PRE>
void <B>stop</B>()</PRE>
<DL>
<DD>Stops a Monitoring Job. Note that a time based job can also stop
automatically if the specified number of samples have been taken.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getInitiator()"><!-- --></A><H3>
getInitiator</H3>
<PRE>
java.lang.String <B>getInitiator</B>()</PRE>
<DL>
<DD>Returns the identifier of the principal who initiated the job. This is
set at the time when <A HREF="../../../../org/osgi/service/monitor/MonitorAdmin.html#startJob(java.lang.String, java.lang.String[], int)"><CODE>MonitorAdmin.startJob</CODE></A> method is called. This string holds the ServerID
if the operation was initiated from a remote manager, or an arbitrary ID
of the initiator entity in the local case (used for addressing
notification events).
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the ID of the initiator, cannot be <code>null</code></DL>
</DD>
</DL>
<HR>
<A NAME="getStatusVariableNames()"><!-- --></A><H3>
getStatusVariableNames</H3>
<PRE>
java.lang.String[] <B>getStatusVariableNames</B>()</PRE>
<DL>
<DD>Returns the list of <code>StatusVariable</code> names that are the
targets of this measurement job. For time based jobs, the
<code>MonitorAdmin</code> will iterate through this list and query all
<code>StatusVariable</code>s when its timer set by the job's frequency
rate expires.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the target list of the measurement job in
[Monitorable_ID]/[StatusVariable_ID] format, cannot be
<code>null</code></DL>
</DD>
</DL>
<HR>
<A NAME="getSchedule()"><!-- --></A><H3>
getSchedule</H3>
<PRE>
int <B>getSchedule</B>()</PRE>
<DL>
<DD>Returns the delay (in seconds) between two samples. If this call returns
N (greater than 0) then the <code>MonitorAdmin</code> queries each
<code>StatusVariable</code> that belongs to this job every N seconds.
The value 0 means that the job is not scheduled but event based: in this
case instant notification on changes is requested (at every n-th change of
the value, as specified by the report count parameter).
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the delay (in seconds) between samples, or 0 for change based
jobs</DL>
</DD>
</DL>
<HR>
<A NAME="getReportCount()"><!-- --></A><H3>
getReportCount</H3>
<PRE>
int <B>getReportCount</B>()</PRE>
<DL>
<DD>Returns the number of times <code>MonitorAdmin</code> will query the
<code>StatusVariable</code>s (for time based jobs), or the number of changes
of a <code>StatusVariable</code> between notifications (for change based
jobs). Time based jobs with non-zero report count will take
<code>getReportCount()</code>*<code>getSchedule()</code> time to finish. Time based
jobs with 0 report count and change based jobs do not stop automatically,
but all jobs can be stopped with the <A HREF="../../../../org/osgi/service/monitor/MonitoringJob.html#stop()"><CODE>stop()</CODE></A> method.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the number of measurements to be taken, or the number of changes
between notifications</DL>
</DD>
</DL>
<HR>
<A NAME="isLocal()"><!-- --></A><H3>
isLocal</H3>
<PRE>
boolean <B>isLocal</B>()</PRE>
<DL>
<DD>Returns whether the job was started locally or remotely. Jobs started by
the clients of this API are always local, remote jobs can only be started
using the Device Management Tree.
<P>
<DD><DL>
<DT><B>Returns:</B><DD><code>true</code> if the job was started from the local device,
<code>false</code> if the job was initiated from a management
server through the device management tree</DL>
</DD>
</DL>
<HR>
<A NAME="isRunning()"><!-- --></A><H3>
isRunning</H3>
<PRE>
boolean <B>isRunning</B>()</PRE>
<DL>
<DD>Returns whether the job is running. A job is running until it is
explicitly stopped, or, in case of time based jobs with a finite report
count, until the given number of measurements have been made.
<P>
<DD><DL>
<DT><B>Returns:</B><DD><code>true</code> if the job is still running, <code>false</code>
if it has finished</DL>
</DD>
</DL>
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