/*
* Copyright ( c ) 2013 , 2022 , 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 .
*/
import java.util.Arrays;
import java.text.NumberFormat;
import static jdk.test.lib.Asserts.*;
import jdk.test.lib.Utils;
/**
* The helper class for parsing following output from command ' jstat - gcutil ' :
*
* S0 S1 E O M CCS YGC YGCT FGC FGCT CGC CGCT GCT
* 0 . 00 0 . 00 0 . 00 52 . 39 97 . 76 92 . 71 4 0 . 286 28 28 . 006 2 0 . 086 28 . 378
*
* It will be verified that numerical values have defined types and are reasonable ,
* for example percentage should fit within 0 - 100 interval .
*/
public class JstatGCUtilParser {
public enum GcStatisticsType {
INTEGER, DOUBLE , PERCENTAGE, PERCENTAGE_OR_DASH, INTEGER_OR_DASH, DOUBLE_OR_DASH;
}
public enum GcStatistics {
S0(GcStatisticsType.PERCENTAGE_OR_DASH),
S1(GcStatisticsType.PERCENTAGE_OR_DASH),
E(GcStatisticsType.PERCENTAGE_OR_DASH),
O(GcStatisticsType.PERCENTAGE),
M(GcStatisticsType.PERCENTAGE_OR_DASH),
CCS(GcStatisticsType.PERCENTAGE_OR_DASH),
YGC(GcStatisticsType.INTEGER_OR_DASH),
YGCT(GcStatisticsType.DOUBLE_OR_DASH),
FGC(GcStatisticsType.INTEGER_OR_DASH),
FGCT(GcStatisticsType.DOUBLE_OR_DASH),
CGC(GcStatisticsType.INTEGER_OR_DASH),
CGCT(GcStatisticsType.DOUBLE_OR_DASH),
GCT(GcStatisticsType.DOUBLE );
private final GcStatisticsType type;
private GcStatistics(GcStatisticsType type) {
this .type = type;
}
private GcStatisticsType getType() {
return type;
}
public static boolean isHeadline(String... valueArray) {
if (valueArray.length != values().length) {
return false ;
}
int headersCount = 0 ;
for (int i = 0 ; i < values().length; i++) {
if (valueArray[i].equals(values()[i].toString())) {
headersCount++;
}
}
if (headersCount != values().length) {
return false ;
}
return true ;
}
private static void verifyLength(String... valueArray) throws Exception {
assertEquals(valueArray.length, values().length,
"Invalid number of data columns: " + Arrays.toString(valueArray));
}
public static void verify(String... valueArray) throws Exception {
verifyLength(valueArray);
for (int i = 0 ; i < values().length; i++) {
GcStatisticsType type = values()[i].getType();
String value = valueArray[i].trim();
if ((type.equals(GcStatisticsType.PERCENTAGE_OR_DASH)
|| type.equals(GcStatisticsType.INTEGER_OR_DASH)
|| type.equals(GcStatisticsType.DOUBLE_OR_DASH))
&& value.equals("-" )) {
continue ;
}
if (type.equals(GcStatisticsType.INTEGER)
|| type.equals(GcStatisticsType.INTEGER_OR_DASH)) {
NumberFormat.getInstance().parse(value).intValue();
continue ;
}
if (type.equals(GcStatisticsType.DOUBLE )
|| type.equals(GcStatisticsType.DOUBLE_OR_DASH)) {
NumberFormat.getInstance().parse(value).doubleValue();
continue ;
}
double percentage = NumberFormat.getInstance().parse(value).doubleValue();
assertTrue(0 <= percentage && percentage <= 100 ,
"Not a percentage. value: " + value + " percentage: " + percentage);
}
}
}
private final String output;
public JstatGCUtilParser(String output) {
this .output = output;
}
public String getOutput() {
return output;
}
/**
* The function will discard any lines that come before the header line .
* This can happen if the JVM outputs a warning message for some reason
* before running jstat .
*/
public void parse(int samples) throws Exception {
boolean headlineFound = false ;
int datalineCount = 0 ;
String[] lines = output.split(Utils.NEW_LINE);
for (String line : lines) {
line = line.replaceAll("\\s+" , " " ).trim();
String[] valueArray = line.split(" " );
if (!headlineFound) {
headlineFound = GcStatistics.isHeadline(valueArray);
continue ;
}
GcStatistics.verify(valueArray);
datalineCount++;
}
assertTrue(headlineFound, "No or invalid headline found, expected: " +
Utils.NEW_LINE + Arrays.toString(GcStatistics.values()).replaceAll("," , " " ));
assertEquals(samples, datalineCount,
"Expected " + samples + " samples, got " + datalineCount);
}
}
Messung V0.5 in Prozent C=87 H=92 G=89
¤ Dauer der Verarbeitung: 0.11 Sekunden
(vorverarbeitet am 2026-06-10)
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