memorymonitor.html

基于mondrian 开源框架进行OLAP多维分析

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Removes a <code>Listener</code> from the <code>MemoryMonitor</code>.</TD>
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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../mondrian/util/MemoryMonitor.html#updateListenerThreshold(mondrian.util.MemoryMonitor.Listener, int)">updateListenerThreshold</A></B>(<A HREF="../../mondrian/util/MemoryMonitor.Listener.html" title="interface in mondrian.util">MemoryMonitor.Listener</A>&nbsp;listener,
                        int&nbsp;percentage)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Changes the threshold percentage of a given <code>Listener</code>.</TD>
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<A NAME="addListener(mondrian.util.MemoryMonitor.Listener, int)"><!-- --></A><H3>
addListener</H3>
<PRE>
boolean <B>addListener</B>(<A HREF="../../mondrian/util/MemoryMonitor.Listener.html" title="interface in mondrian.util">MemoryMonitor.Listener</A>&nbsp;listener,
                    int&nbsp;thresholdPercentage)</PRE>
<DL>
<DD>Adds a <code>Listener</code> to the <code>MemoryMonitor</code> with
 a given threshold percentage.

 <p>If the threshold is below the Java5 memory managment system's
 threshold, then the Listener is notified from within this
 method.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>listener</CODE> - the <code>Listener</code> to be added.<DD><CODE>thresholdPercentage</CODE> - the threshold percentage for this
   <code>Listener</code>.
<DT><B>Returns:</B><DD><code>true</code> if the <code>Listener</code> was
   added and <code>false</code> otherwise.</DL>
</DD>
</DL>
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<A NAME="addListener(mondrian.util.MemoryMonitor.Listener)"><!-- --></A><H3>
addListener</H3>
<PRE>
boolean <B>addListener</B>(<A HREF="../../mondrian/util/MemoryMonitor.Listener.html" title="interface in mondrian.util">MemoryMonitor.Listener</A>&nbsp;listener)</PRE>
<DL>
<DD>Adds a <code>Listener</code> using the default threshold percentage.

 <p>If the threshold is below the Java5 memory managment system's
 threshold, then the Listener is notified from within this
 method.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>listener</CODE> - the <code>Listener</code> to be added.
<DT><B>Returns:</B><DD><code>true</code> if the <code>Listener</code> was
 added and <code>false</code> otherwise.</DL>
</DD>
</DL>
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<A NAME="updateListenerThreshold(mondrian.util.MemoryMonitor.Listener, int)"><!-- --></A><H3>
updateListenerThreshold</H3>
<PRE>
void <B>updateListenerThreshold</B>(<A HREF="../../mondrian/util/MemoryMonitor.Listener.html" title="interface in mondrian.util">MemoryMonitor.Listener</A>&nbsp;listener,
                             int&nbsp;percentage)</PRE>
<DL>
<DD>Changes the threshold percentage of a given <code>Listener</code>.

 <p>If the new value is below the system's current value, then the
 <code>Listener</code> will have its notification callback called
 while in this method - so a client should always check if its
 notification method was called immediately after calling this
 method.

 <p>This method can be used if, for example, an algorithm has
 different approaches that result in different memory
 usage profiles; one, large memory but fast and
 a second which is low-memory but slow. The algorithm starts
 with the large memory approach, receives a low memory
 notification, switches to the low memory approach and changes
 when it should be notified for this new approach. The first
 approach need to be notified at a lower percentage because it
 uses lots of memory, possibly quickly; while the second
 approach, possibly a file based algorithm, has smaller memory
 requirements and uses memory less quickly thus one can
 live with a higher notification threshold percentage.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>listener</CODE> - the <code>Listener</code> being updated.<DD><CODE>percentage</CODE> - new percentage threshold.</DL>
</DD>
</DL>
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<A NAME="removeListener(mondrian.util.MemoryMonitor.Listener)"><!-- --></A><H3>
removeListener</H3>
<PRE>
boolean <B>removeListener</B>(<A HREF="../../mondrian/util/MemoryMonitor.Listener.html" title="interface in mondrian.util">MemoryMonitor.Listener</A>&nbsp;listener)</PRE>
<DL>
<DD>Removes a <code>Listener</code> from the <code>MemoryMonitor</code>.
 Returns <code>true</code> if listener was removed and
 <code>false</code> otherwise.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>listener</CODE> - the listener to be removed
<DT><B>Returns:</B><DD><code>true</code> if listener was removed.</DL>
</DD>
</DL>
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<A NAME="removeAllListener()"><!-- --></A><H3>
removeAllListener</H3>
<PRE>
void <B>removeAllListener</B>()</PRE>
<DL>
<DD>Clear out all <code>Listener</code>s and turnoff JVM
 memory notification.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getMaxMemory()"><!-- --></A><H3>
getMaxMemory</H3>
<PRE>
long <B>getMaxMemory</B>()</PRE>
<DL>
<DD>Returns the maximum memory usage.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>the maximum memory usage.</DL>
</DD>
</DL>
<HR>

<A NAME="getUsedMemory()"><!-- --></A><H3>
getUsedMemory</H3>
<PRE>
long <B>getUsedMemory</B>()</PRE>
<DL>
<DD>Returns the current memory used.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>the current memory used.</DL>
</DD>
</DL>
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