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Metric (stat4j API)
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net.sourceforge.stat4j</FONT>
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Class Metric</H2>
<PRE>
java.lang.Object
  <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>net.sourceforge.stat4j.Metric</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>Metric</B><DT>extends java.lang.Object</DL>
</PRE>

<P>
Name:           Metric.java
 Date:          Aug 29, 2004
 Description:
 
 A metric is collected from a log either at a point in time (single reading) or
 over 2 points in time (dual reading). A dual reading enables deltas such as durations and
 memory usage to be calculated.
 
 A metric will only be generated for a statsictic if the log message matches the 
 statistic filter. The filter also defines an optional expression for
 scaping user defined values from the log.
 
 A reading holds the time,free memory and a user defined
 value for a point in time. 
 
 Typically metrics that require dual readings will be cached
 for the first reading and then sent to the statstic calculator once
 the second reading has been captured. The statistic defines the filters
 for each reading.
 
 Calculators may override caching by setting  setApplyImmediate to true. RunningTotals are
 examples of calculators that must be sent  metrics
 when a match occurs on either statisitic filter.
 
 Metrics may be collected across all threads or 
 locally within a given thread (thread local). This
 is so that we can support metrics for a given call stack such
 as method duration and global metrics such as average user session
 duration.
<P>

<P>
<DL>
<DT><B>Author:</B></DT>
  <DD>Lara D'Abreo</DD>
<DT><B>See Also:</B><DD><A HREF="../../../net/sourceforge/stat4j/Filter.html" title="class in net.sourceforge.stat4j"><CODE>Filter</CODE></A>, 
<A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j"><CODE>Reading</CODE></A>, 
<A HREF="../../../net/sourceforge/stat4j/Calculator.html" title="interface in net.sourceforge.stat4j"><CODE>Calculator</CODE></A>, 
<A HREF="../../../net/sourceforge/stat4j/Statistic.html" title="class in net.sourceforge.stat4j"><CODE>value scraped from the log taken at one or 2 points in time</CODE></A></DL>
<HR>

<P>
<!-- =========== FIELD SUMMARY =========== -->

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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<B>Field Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;<A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#firstReading">firstReading</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;<A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#secondReading">secondReading</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#statisticName">statisticName</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#Metric(java.lang.String, net.sourceforge.stat4j.Reading)">Metric</A></B>(java.lang.String&nbsp;statisticName,
       <A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A>&nbsp;reading)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#Metric(java.lang.String, net.sourceforge.stat4j.Reading, net.sourceforge.stat4j.Reading)">Metric</A></B>(java.lang.String&nbsp;statisticName,
       <A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A>&nbsp;first,
       <A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A>&nbsp;second)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<!-- ========== METHOD SUMMARY =========== -->

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<B>Method Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#getFirstReading()">getFirstReading</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;double</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#getReading(net.sourceforge.stat4j.Unit)">getReading</A></B>(<A HREF="../../../net/sourceforge/stat4j/Unit.html" title="class in net.sourceforge.stat4j">Unit</A>&nbsp;unit)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;double</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#getReadingDelta(net.sourceforge.stat4j.Unit)">getReadingDelta</A></B>(<A HREF="../../../net/sourceforge/stat4j/Unit.html" title="class in net.sourceforge.stat4j">Unit</A>&nbsp;unit)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#getSecondReading()">getSecondReading</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#getStatisticName()">getStatisticName</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;long</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#getTimestamp()">getTimestamp</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#hasFirstReading()">hasFirstReading</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#hasSecondReading()">hasSecondReading</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#isDual()">isDual</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#isSingle()">isSingle</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../net/sourceforge/stat4j/Metric.html#setSecondReading(net.sourceforge.stat4j.Reading)">setSecondReading</A></B>(<A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A>&nbsp;reading)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<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>
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&nbsp;
<P>

<!-- ============ FIELD DETAIL =========== -->

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<B>Field Detail</B></FONT></TH>
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<A NAME="statisticName"><!-- --></A><H3>
statisticName</H3>
<PRE>
protected java.lang.String <B>statisticName</B></PRE>
<DL>
<DL>
</DL>
</DL>
<HR>

<A NAME="firstReading"><!-- --></A><H3>
firstReading</H3>
<PRE>
protected <A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A> <B>firstReading</B></PRE>
<DL>
<DL>
</DL>
</DL>
<HR>

<A NAME="secondReading"><!-- --></A><H3>
secondReading</H3>
<PRE>
protected <A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A> <B>secondReading</B></PRE>
<DL>
<DL>
</DL>
</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<B>Constructor Detail</B></FONT></TH>
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</TABLE>

<A NAME="Metric(java.lang.String, net.sourceforge.stat4j.Reading)"><!-- --></A><H3>
Metric</H3>
<PRE>
public <B>Metric</B>(java.lang.String&nbsp;statisticName,
              <A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A>&nbsp;reading)</PRE>
<DL>
</DL>
<HR>

<A NAME="Metric(java.lang.String, net.sourceforge.stat4j.Reading, net.sourceforge.stat4j.Reading)"><!-- --></A><H3>
Metric</H3>
<PRE>
public <B>Metric</B>(java.lang.String&nbsp;statisticName,
              <A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A>&nbsp;first,
              <A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A>&nbsp;second)</PRE>
<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="isSingle()"><!-- --></A><H3>
isSingle</H3>
<PRE>
public boolean <B>isSingle</B>()</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="isDual()"><!-- --></A><H3>
isDual</H3>
<PRE>
public boolean <B>isDual</B>()</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="hasFirstReading()"><!-- --></A><H3>
hasFirstReading</H3>
<PRE>
public boolean <B>hasFirstReading</B>()</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="hasSecondReading()"><!-- --></A><H3>
hasSecondReading</H3>
<PRE>
public boolean <B>hasSecondReading</B>()</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getSecondReading()"><!-- --></A><H3>
getSecondReading</H3>
<PRE>
public <A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A> <B>getSecondReading</B>()</PRE>
<DL>
<DD><DL>

<DT><B>Returns:</B><DD></DL>
</DD>
</DL>
<HR>

<A NAME="getFirstReading()"><!-- --></A><H3>
getFirstReading</H3>
<PRE>
public <A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A> <B>getFirstReading</B>()</PRE>
<DL>
<DD><DL>

<DT><B>Returns:</B><DD></DL>
</DD>
</DL>
<HR>

<A NAME="setSecondReading(net.sourceforge.stat4j.Reading)"><!-- --></A><H3>
setSecondReading</H3>
<PRE>
public void <B>setSecondReading</B>(<A HREF="../../../net/sourceforge/stat4j/Reading.html" title="class in net.sourceforge.stat4j">Reading</A>&nbsp;reading)</PRE>
<DL>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>reading</CODE> - </DL>
</DD>
</DL>
<HR>

<A NAME="getReadingDelta(net.sourceforge.stat4j.Unit)"><!-- --></A><H3>
getReadingDelta</H3>
<PRE>
public double <B>getReadingDelta</B>(<A HREF="../../../net/sourceforge/stat4j/Unit.html" title="class in net.sourceforge.stat4j">Unit</A>&nbsp;unit)</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getReading(net.sourceforge.stat4j.Unit)"><!-- --></A><H3>
getReading</H3>
<PRE>
public double <B>getReading</B>(<A HREF="../../../net/sourceforge/stat4j/Unit.html" title="class in net.sourceforge.stat4j">Unit</A>&nbsp;unit)</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getTimestamp()"><!-- --></A><H3>
getTimestamp</H3>
<PRE>
public long <B>getTimestamp</B>()</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getStatisticName()"><!-- --></A><H3>
getStatisticName</H3>
<PRE>
public java.lang.String <B>getStatisticName</B>()</PRE>
<DL>
<DD><DL>

<DT><B>Returns:</B><DD></DL>
</DD>
</DL>
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