|
/*
* Copyright (c) 2016, 2018, 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.
*
* 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 jdk.jfr.tool;
import java.nio.file.Path;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import jdk.jfr.Configuration;
import jdk.jfr.Event;
import jdk.jfr.Recording;
import jdk.test.lib.JDKToolLauncher;
import jdk.test.lib.Utils;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;;
final class ExecuteHelper {
public static Object[] array;
static class CustomEvent extends Event {
int intValue;
long longValue;
double doubliValue;
float floatValue;
String stringValue;
Short shortValue;
boolean booleanValue;
char charValue;
double trickyDouble;
}
public static void emitCustomEvents() {
// Custom events with potentially tricky values
CustomEvent event1 = new CustomEvent();
event1.trickyDouble = Double.NaN;
event1.intValue = Integer.MIN_VALUE;
event1.longValue = Long.MIN_VALUE;
event1.doubliValue = Double.MIN_VALUE;
event1.floatValue = Float.MIN_VALUE;
StringBuilder sb = new StringBuilder();
for (int i = 0; i < 512; i++) {
sb.append((char) i);
}
sb.append("\u2324");
event1.stringValue = sb.toString();
event1.shortValue = Short.MIN_VALUE;
event1.booleanValue = true;
event1.booleanValue = false;
event1.charValue = '\b';
event1.commit();
CustomEvent event2 = new CustomEvent();
event2.trickyDouble = Double.NEGATIVE_INFINITY;
event2.intValue = Integer.MAX_VALUE;
event2.longValue = Long.MAX_VALUE;
event2.doubliValue = Double.MAX_VALUE;
event2.floatValue = Float.MAX_VALUE;
event2.stringValue = null;
event2.shortValue = Short.MAX_VALUE;
event2.booleanValue = false;
event2.charValue = 0;
event2.commit();
}
public static Path createProfilingRecording() throws Exception {
Path file = Utils.createTempFile("profiling-recording", ".jfr");
// Create a recording with some data
try (Recording r = new Recording(Configuration.getConfiguration("profile"))) {
r.start();
// Allocation event
array = new Object[1000000];
array = null;
// Class loading event etc
provokeClassLoading();
// GC events
System.gc();
// ExecutionSample
long t = System.currentTimeMillis();
while (System.currentTimeMillis() - t < 50) {
// do nothing
}
// Other periodic events, i.e CPU load
Thread.sleep(1000);
r.stop();
r.dump(file);
}
return file;
}
private static void provokeClassLoading() {
// Matching a string with regexp
// is expected to load some classes and generate some VM events
Pattern p = Pattern.compile("a*b");
Matcher m = p.matcher("aaaaab");
m.matches();
}
public static OutputAnalyzer jfr(String... args) throws Throwable {
JDKToolLauncher l = JDKToolLauncher.createUsingTestJDK("jfr");
for (String arg : args) {
l.addToolArg(arg);
}
return ProcessTools.executeCommand(l.getCommand());
}
}
¤ Dauer der Verarbeitung: 0.0 Sekunden
(vorverarbeitet)
¤
|
Haftungshinweis
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung ist noch experimentell.
|
