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/*
* Copyright (c) 2013, 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.
*/
import java.util.Arrays;
import jdk.testlibrary.Utils;
import static jdk.testlibrary.Asserts.*;
import java.text.NumberFormat;
/**
* 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 86.67 0.00 - - 0 0.000 0 0.000 0 0.000 0.000
* 0.00 0.00 86.67 0.00 - - 0 0.000 0 0.000 0 0.000 0.000
*
* 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;
}
public enum GcStatistics {
S0(GcStatisticsType.PERCENTAGE),
S1(GcStatisticsType.PERCENTAGE),
E(GcStatisticsType.PERCENTAGE),
O(GcStatisticsType.PERCENTAGE),
M(GcStatisticsType.PERCENTAGE_OR_DASH),
CCS(GcStatisticsType.PERCENTAGE_OR_DASH),
YGC(GcStatisticsType.INTEGER),
YGCT(GcStatisticsType.DOUBLE),
FGC(GcStatisticsType.INTEGER),
FGCT(GcStatisticsType.DOUBLE),
CGC(GcStatisticsType.INTEGER),
CGCT(GcStatisticsType.DOUBLE),
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.INTEGER)) {
NumberFormat.getInstance().parse(value).intValue();
break;
}
if (type.equals(GcStatisticsType.DOUBLE)) {
NumberFormat.getInstance().parse(value).doubleValue();
break;
}
if (type.equals(GcStatisticsType.PERCENTAGE_OR_DASH) &&
value.equals("-")) {
break;
}
double percentage = NumberFormat.getInstance().parse(value).doubleValue();
assertTrue(0 <= percentage && percentage <= 100,
"Not a percentage: " + value);
}
}
}
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);
}
}
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