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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.4.2_02) on Thu Nov 13 17:20:54 PST 2003 --><TITLE>CounterMonitor (Java 2 Platform Ent. Ed. v1.4)</TITLE><META NAME="keywords" CONTENT="javax.management.monitor.CounterMonitor class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="CounterMonitor (Java 2 Platform Ent. 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Ed. v1.4</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> PREV CLASS <A HREF="../../../javax/management/monitor/GaugeMonitor.html" title="class in javax.management.monitor"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="CounterMonitor.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | <A HREF="#fields_inherited_from_class_javax.management.monitor.Monitor">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.management.monitor</FONT><BR>Class CounterMonitor</H2><PRE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../javax/management/NotificationBroadcasterSupport.html" title="class in javax.management">javax.management.NotificationBroadcasterSupport</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../javax/management/monitor/Monitor.html" title="class in javax.management.monitor">javax.management.monitor.Monitor</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by"><B>javax.management.monitor.CounterMonitor</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../javax/management/monitor/CounterMonitorMBean.html" title="interface in javax.management.monitor">CounterMonitorMBean</A>, <A HREF="../../../javax/management/MBeanRegistration.html" title="interface in javax.management">MBeanRegistration</A>, <A HREF="../../../javax/management/monitor/MonitorMBean.html" title="interface in javax.management.monitor">MonitorMBean</A>, <A HREF="../../../javax/management/NotificationBroadcaster.html" title="interface in javax.management">NotificationBroadcaster</A>, <A HREF="../../../javax/management/NotificationEmitter.html" title="interface in javax.management">NotificationEmitter</A></DD></DL><HR><DL><DT>public class <B>CounterMonitor</B><DT>extends <A HREF="../../../javax/management/monitor/Monitor.html" title="class in javax.management.monitor">Monitor</A><DT>implements <A HREF="../../../javax/management/monitor/CounterMonitorMBean.html" title="interface in javax.management.monitor">CounterMonitorMBean</A></DL><P>Defines a monitor MBean designed to observe the values of a counter attribute. <P> A counter monitor sends a <A HREF="../../../javax/management/monitor/MonitorNotification.html#THRESHOLD_VALUE_EXCEEDED"><CODE>threshold notification</CODE></A> when the value of the counter reaches or exceeds a threshold known as the comparison level. The notify flag must be set to <CODE>true</CODE>. <BR>In addition, an offset mechanism enables particular counting intervals to be detected. <P> If the offset value is not zero, whenever the threshold is triggered by the counter value reaching a comparison level, that comparison level is incremented by the offset value. This is regarded as taking place instantaneously, that is before the count is incremented. Thus, for each level, the threshold triggers an event notification every time the count increases by an interval equal to the offset value. <P> If the counter can wrap around its maximum value, the modulus needs to be specified. The modulus is the value at which the counter is reset to zero. <P> If the counter difference mode is used, the value of the derived gauge is calculated as the difference between the observed counter values for two successive observations. If this difference is negative, the value of the derived gauge is incremented by the value of the modulus. <BR>The derived gauge value (V[t]) is calculated using the following method:w * <UL> <LI>if (counter[t] - counter[t-GP]) is positive then V[t] = counter[t] - counter[t-GP] <LI>if (counter[t] - counter[t-GP]) is negative then V[t] = counter[t] - counter[t-GP] + MODULUS </UL> This implementation of the counter monitor requires the observed attribute to be of the type integer (<CODE>Byte</CODE>, <CODE>Integer</CODE>, <CODE>Short</CODE>, <CODE>Long</CODE>).<P><P><DL><DT><B>Version:</B></DT> <DD>1.59 10/08/02</DD><DT><B>Author:</B></DT> <DD>Sun Microsystems, Inc</DD></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR></TABLE> <A NAME="fields_inherited_from_class_javax.management.monitor.Monitor"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class javax.management.monitor.<A HREF="../../../javax/management/monitor/Monitor.html" title="class in javax.management.monitor">Monitor</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../javax/management/monitor/Monitor.html#alreadyNotified">alreadyNotified</A>, <A HREF="../../../javax/management/monitor/Monitor.html#alreadyNotifieds">alreadyNotifieds</A>, <A HREF="../../../javax/management/monitor/Monitor.html#capacityIncrement">capacityIncrement</A>, <A HREF="../../../javax/management/monitor/Monitor.html#dbgTag">dbgTag</A>, <A HREF="../../../javax/management/monitor/Monitor.html#elementCount">elementCount</A>, <A HREF="../../../javax/management/monitor/Monitor.html#OBSERVED_ATTRIBUTE_ERROR_NOTIFIED">OBSERVED_ATTRIBUTE_ERROR_NOTIFIED</A>, <A HREF="../../../javax/management/monitor/Monitor.html#OBSERVED_ATTRIBUTE_TYPE_ERROR_NOTIFIED">OBSERVED_ATTRIBUTE_TYPE_ERROR_NOTIFIED</A>, <A HREF="../../../javax/management/monitor/Monitor.html#OBSERVED_OBJECT_ERROR_NOTIFIED">OBSERVED_OBJECT_ERROR_NOTIFIED</A>, <A HREF="../../../javax/management/monitor/Monitor.html#RESET_FLAGS_ALREADY_NOTIFIED">RESET_FLAGS_ALREADY_NOTIFIED</A>, <A HREF="../../../javax/management/monitor/Monitor.html#RUNTIME_ERROR_NOTIFIED">RUNTIME_ERROR_NOTIFIED</A>, <A HREF="../../../javax/management/monitor/Monitor.html#server">server</A></CODE></TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/management/monitor/CounterMonitor.html#CounterMonitor()">CounterMonitor</A></B>()</CODE><BR> Default constructor.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Number.html" title="class or interface in java.lang">Number</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/management/monitor/CounterMonitor.html#getDerivedGauge()">getDerivedGauge</A></B>()</CODE><BR> <B>Deprecated.</B> <I>As of JMX 1.2, replaced by <A HREF="../../../javax/management/monitor/CounterMonitor.html#getDerivedGauge(javax.management.ObjectName)"><CODE>getDerivedGauge(ObjectName)</CODE></A></I></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Number.html" title="class or interface in java.lang">Number</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/management/monitor/CounterMonitor.html#getDerivedGauge(javax.management.ObjectName)">getDerivedGauge</A></B>(<A HREF="../../../javax/management/ObjectName.html" title="class in javax.management">ObjectName</A> object)</CODE><BR> Gets the derived gauge of the specified object, if this object is contained in the set of observed MBeans, or <code>null</code> otherwise.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/management/monitor/CounterMonitor.html#getDerivedGaugeTimeStamp()">getDerivedGaugeTimeStamp</A></B>()</CODE><BR> <B>Deprecated.</B> <I>As of JMX 1.2, replaced by <A HREF="../../../javax/management/monitor/CounterMonitor.html#getDerivedGaugeTimeStamp(javax.management.ObjectName)"><CODE>getDerivedGaugeTimeStamp(ObjectName)</CODE></A></I></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/management/monitor/CounterMonitor.html#getDerivedGaugeTimeStamp(javax.management.ObjectName)">getDerivedGaugeTimeStamp</A></B>(<A HREF="../../../javax/management/ObjectName.html" title="class in javax.management">ObjectName</A> object)</CODE><BR> Gets the derived gauge timestamp of the specified object, if this object is contained in the set of observed MBeans, or <code>null</code> otherwise.</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="../../../javax/management/monitor/CounterMonitor.html#getDifferenceMode()">getDifferenceMode</A></B>()</CODE><BR> Gets the difference mode flag value common to all observed MBeans.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Number.html" title="class or interface in java.lang">Number</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/management/monitor/CounterMonitor.html#getInitThreshold()">getInitThreshold</A></B>()</CODE><BR>⌨️ 快捷键说明
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