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Java example source code file (JMapHProfLargeHeapTest.java)

This example Java source code file (JMapHProfLargeHeapTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

exception, expected, filereader, heap_dump_file_name, hprof_header_1_0_1, java, jdktoollauncher, macosx, nio, outputanalyzer, processbuilder, profile, reader, scanner, string, util

The JMapHProfLargeHeapTest.java Java example source code

/*
 * Copyright (c) 2013, 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.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.nio.CharBuffer;
import java.util.Arrays;
import java.util.Scanner;

import com.oracle.java.testlibrary.Asserts;
import com.oracle.java.testlibrary.JDKToolFinder;
import com.oracle.java.testlibrary.JDKToolLauncher;
import com.oracle.java.testlibrary.OutputAnalyzer;
import com.oracle.java.testlibrary.Platform;
import com.oracle.java.testlibrary.ProcessTools;

/*
 * @test
 * @bug 6313383
 * @key regression
 * @summary Regression test for hprof export issue due to large heaps (>2G)
 * @library /testlibrary
 * @compile JMapHProfLargeHeapProc.java
 * @run main JMapHProfLargeHeapTest
 */

public class JMapHProfLargeHeapTest {
    private static final String HEAP_DUMP_FILE_NAME = "heap.hprof";
    private static final String HPROF_HEADER_1_0_1 = "JAVA PROFILE 1.0.1";
    private static final String HPROF_HEADER_1_0_2 = "JAVA PROFILE 1.0.2";
    private static final long M = 1024L;
    private static final long G = 1024L * M;

    public static void main(String[] args) throws Exception {
        // If we are on MacOSX, test if JMap tool is signed, otherwise return
        // since test will fail with privilege error.
        if (Platform.isOSX()) {
            String jmapToolPath = JDKToolFinder.getTestJDKTool("jmap");
            ProcessBuilder codesignProcessBuilder = new ProcessBuilder(
                    "codesign", "-v", jmapToolPath);
            Process codesignProcess = codesignProcessBuilder.start();
            OutputAnalyzer analyser = new OutputAnalyzer(codesignProcess);
            try {
                analyser.shouldNotContain("code object is not signed at all");
                System.out.println("Signed jmap found at: " + jmapToolPath);
            } catch (Exception e) {
                // Abort since we can't know if the test will work
                System.out
                        .println("Test aborted since we are on MacOSX and the jmap tool is not signed.");
                return;
            }
        }

        // Small heap 22 megabytes, should create 1.0.1 file format
        testHProfFileFormat("-Xmx1g", 22 * M, HPROF_HEADER_1_0_1);

        /**
         * This test was deliberately commented out since the test system lacks
         * support to handle the requirements for this kind of heap size in a
         * good way. If or when it becomes possible to run this kind of tests in
         * the test environment the test should be enabled again.
         * */
        // Large heap 2,2 gigabytes, should create 1.0.2 file format
        // testHProfFileFormat("-Xmx4g", 2 * G + 2 * M, HPROF_HEADER_1_0_2);
    }

    private static void testHProfFileFormat(String vmArgs, long heapSize,
            String expectedFormat) throws Exception, IOException,
            InterruptedException, FileNotFoundException {
        ProcessBuilder procBuilder = ProcessTools.createJavaProcessBuilder(
                vmArgs, "JMapHProfLargeHeapProc", String.valueOf(heapSize));
        procBuilder.redirectError(ProcessBuilder.Redirect.INHERIT);
        Process largeHeapProc = procBuilder.start();

        try (Scanner largeHeapScanner = new Scanner(
                largeHeapProc.getInputStream());) {
            String pidstring = null;
            while ((pidstring = largeHeapScanner.findInLine("PID\\[[0-9].*\\]")) == null) {
                Thread.sleep(500);
            }
            int pid = Integer.parseInt(pidstring.substring(4,
                    pidstring.length() - 1));
            System.out.println("Extracted pid: " + pid);

            JDKToolLauncher jMapLauncher = JDKToolLauncher
                    .createUsingTestJDK("jmap");
            jMapLauncher.addToolArg("-dump:format=b,file=" + pid + "-"
                    + HEAP_DUMP_FILE_NAME);
            jMapLauncher.addToolArg(String.valueOf(pid));

            ProcessBuilder jMapProcessBuilder = new ProcessBuilder(
                    jMapLauncher.getCommand());
            System.out.println("jmap command: "
                    + Arrays.toString(jMapLauncher.getCommand()));

            Process jMapProcess = jMapProcessBuilder.start();
            OutputAnalyzer analyzer = new OutputAnalyzer(jMapProcess);
            analyzer.shouldHaveExitValue(0);
            analyzer.shouldContain(pid + "-" + HEAP_DUMP_FILE_NAME);
            analyzer.shouldContain("Heap dump file created");

            largeHeapProc.getOutputStream().write('\n');

            File dumpFile = new File(pid + "-" + HEAP_DUMP_FILE_NAME);
            Asserts.assertTrue(dumpFile.exists(), "Heap dump file not found.");

            try (Reader reader = new BufferedReader(new FileReader(dumpFile))) {
                CharBuffer buf = CharBuffer.allocate(expectedFormat.length());
                reader.read(buf);
                buf.clear();
                Asserts.assertEQ(buf.toString(), expectedFormat,
                        "Wrong file format. Expected '" + expectedFormat
                                + "', but found '" + buf.toString() + "'");
            }

            System.out.println("Success!");

        } finally {
            largeHeapProc.destroyForcibly();
        }
    }
}

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