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/*
* Copyright (c) 2004, 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 sun.tools.jstat;
import java.util.*;
import java.io.*;
import sun.jvmstat.monitor.*;
import sun.jvmstat.monitor.event.*;
import java.util.regex.PatternSyntaxException;
/**
* Class to sample and output various jvmstat statistics for a target Java
* a target Java Virtual Machine.
*
* @author Brian Doherty
* @since 1.5
*/
public class JStatLogger {
private MonitoredVm monitoredVm;
private volatile boolean active = true;
public JStatLogger(MonitoredVm monitoredVm) {
this.monitoredVm = monitoredVm;
}
/**
* print the monitors that match the given monitor name pattern string.
*/
public void printNames(String names, Comparator<Monitor> comparator,
boolean showUnsupported, PrintStream out)
throws MonitorException, PatternSyntaxException {
// get the set of all monitors
List<Monitor> items = monitoredVm.findByPattern(names);
Collections.sort(items, comparator);
for (Monitor m: items) {
if (!(m.isSupported() || showUnsupported)) {
continue;
}
out.println(m.getName());
}
}
/**
* print name=value pairs for the given list of monitors.
*/
public void printSnapShot(String names, Comparator<Monitor> comparator,
boolean verbose, boolean showUnsupported,
PrintStream out)
throws MonitorException, PatternSyntaxException {
// get the set of all monitors
List<Monitor> items = monitoredVm.findByPattern(names);
Collections.sort(items, comparator);
printList(items, verbose, showUnsupported, out);
}
/**
* print name=value pairs for the given list of monitors.
*/
public void printList(List<Monitor> list, boolean verbose, boolean showUnsupported,
PrintStream out)
throws MonitorException {
// print out the name of each available counter
for (Monitor m: list ) {
if (!(m.isSupported() || showUnsupported)) {
continue;
}
StringBuilder buffer = new StringBuilder();
buffer.append(m.getName()).append("=");
if (m instanceof StringMonitor) {
buffer.append("\"").append(m.getValue()).append("\"");
} else {
buffer.append(m.getValue());
}
if (verbose) {
buffer.append(" ").append(m.getUnits());
buffer.append(" ").append(m.getVariability());
buffer.append(" ").append(m.isSupported() ? "Supported"
: "Unsupported");
}
out.println(buffer);
}
}
/**
* method to for asynchronous termination of sampling loops
*/
public void stopLogging() {
active = false;
}
/**
* print samples according to the given format.
*/
public void logSamples(OutputFormatter formatter, int headerRate,
int sampleInterval, int sampleCount, PrintStream out)
throws MonitorException {
long iterationCount = 0;
int printHeaderCount = 0;
// if printHeader == 0, then only an initial column header is desired.
int printHeader = headerRate;
if (printHeader == 0) {
// print the column header once, disable future printing
out.println(formatter.getHeader());
printHeader = -1;
}
while (active) {
// check if it's time to print another column header
if (printHeader > 0 && --printHeaderCount <= 0) {
printHeaderCount = printHeader;
out.println(formatter.getHeader());
}
out.println(formatter.getRow());
// check if we've hit the specified sample count
if (sampleCount > 0 && ++iterationCount >= sampleCount) {
break;
}
try { Thread.sleep(sampleInterval); } catch (Exception e) { };
}
}
}
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