/*
* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.visualvm.modules.tracer.jvmstat;
import com.sun.tools.visualvm.modules.tracer.ProbeItemDescriptor;
import com.sun.tools.visualvm.modules.tracer.TracerProbe;
import static com.sun.tools.visualvm.modules.tracer.jvmstat.JvmstatCounterFormatter.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import sun.jvmstat.monitor.Monitor;
/**
*
* @author Tomas Hurka
*/
class JvmstatCounterProbe extends TracerProbe {
private static final Logger LOGGER = Logger.getLogger(JvmstatCounterProbe.class.getName());
private static final String Variability_MONOTONIC = "Monotonic"; // NOI18N
private Monitor counter;
private long lastVal;
private long lastTime;
private boolean ticks;
JvmstatCounterProbe(String name, String desc, Monitor c) {
super(createItemDescriptors(name, desc, c));
counter = c;
String u = Utils.getUnits(c).toString();
ticks = u.equals(Units_TICKS) || (u.equals(Units_EVENTS) && Utils.getVariability(c).toString().equals(Variability_MONOTONIC));
}
private static final ProbeItemDescriptor[] createItemDescriptors(String name, String desc, Monitor c) {
return new ProbeItemDescriptor[] {
ProbeItemDescriptor.continuousLineItem(name, desc,
new JvmstatCounterFormatter(c), 1d, 0, ProbeItemDescriptor.MAX_VALUE_UNDEFINED),
};
}
public long[] getItemValues(long time) {
try {
Object val = counter.getValue();
if (val instanceof Number) {
Number num = (Number) val;
long value = num.longValue();
return new long[] {convert(value)};
}
} catch (Throwable t) {
LOGGER.log(Level.INFO, "Failed to read UnixOperatingSystemMXBean attributes", t); // NOI18N
}
return new long[1]; // ??? should return null -- or -- catch exception in TracerController.fetchDataImpl()
}
private long convert(long value) {
if (ticks) {
long now = System.currentTimeMillis();
long diff = 0;
if (lastTime != 0) {
diff = 1000 * (value - lastVal) / (now - lastTime);
}
lastTime = now;
lastVal = value;
return diff;
}
return value;
}
}