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Java example source code file (LocalManagementTest.java)

This example Java source code file (LocalManagementTest.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

arraylist, atomicreference, boolean, exception, filesystem, path, pid, processbuilder, reflection, string, test_classpath, test_jdk, testapplication, testmanager, threading, threads, util

The LocalManagementTest.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.File;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;

/**
 * @test
 * @library /lib/testlibrary
 * @bug 5016507 6173612 6319776 6342019 6484550 8004926
 * @summary Start a managed VM and test that a management tool can connect
 *          without connection or username/password details.
 *          TestManager will attempt a connection to the address obtained from
 *          both agent properties and jvmstat buffer.
 * @build jdk.testlibrary.ProcessTools
 * @build TestManager TestApplication
 * @run main/othervm/timeout=300 LocalManagementTest
 */

import jdk.testlibrary.ProcessTools;

public class LocalManagementTest {
    private static final  String TEST_CLASSPATH = System.getProperty("test.class.path");
    private static final  String TEST_JDK = System.getProperty("test.jdk");

    public static void main(String[] args) throws Exception {
        int failures = 0;
        for(Method m : LocalManagementTest.class.getDeclaredMethods()) {
            if (Modifier.isStatic(m.getModifiers()) &&
                m.getName().startsWith("test")) {
                m.setAccessible(true);
                try {
                    System.out.println(m.getName());
                    System.out.println("==========");
                    Boolean rslt = (Boolean)m.invoke(null);
                    if (!rslt) {
                        System.err.println(m.getName() + " failed");
                        failures++;
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    failures++;
                }
            }
        }
        if (failures > 0) {
            throw new Error("Test failed");
        }
    }

    private static boolean test1() throws Exception {
        return doTest("1", "-Dcom.sun.management.jmxremote");
    }

    private static boolean test2() throws Exception {
        Path agentPath = findAgent();
        if (agentPath != null) {
            String agent = agentPath.toString();
            return doTest("2", "-javaagent:" + agent);
        } else {
            return false;
        }
    }

    /**
     * no args (blank) - manager should attach and start agent
     */
    private static boolean test3() throws Exception {
        return doTest("3", null);
    }

    /**
     * sanity check arguments to management-agent.jar
     */
    private static boolean test4() throws Exception {
        Path agentPath = findAgent();
        if (agentPath != null) {
            ProcessBuilder builder = ProcessTools.createJavaProcessBuilder(
                "-javaagent:" + agentPath.toString() +
                "=com.sun.management.jmxremote.port=7775," +
                "com.sun.management.jmxremote.authenticate=false," +
                "com.sun.management.jmxremote.ssl=false",
                "-cp",
                TEST_CLASSPATH,
                "TestApplication",
                "-exit"
            );

            Process prc = null;
            try {
                prc = ProcessTools.startProcess(
                    "TestApplication",
                    builder
                );
                int exitCode = prc.waitFor();
                return exitCode == 0;
            } finally {
                if (prc != null) {
                    prc.destroy();
                    prc.waitFor();
                }
            }
        }
        return false;
    }

    /**
     * use DNS-only name service
     */
    private static boolean test5() throws Exception {
        return doTest("5", "-Dsun.net.spi.namservice.provider.1=\"dns,sun\"");
    }

    private static Path findAgent() {
        FileSystem FS = FileSystems.getDefault();
        Path agentPath = FS.getPath(
            TEST_JDK, "jre", "lib", "management-agent.jar"
        );
        if (!isFileOk(agentPath)) {
            agentPath = FS.getPath(
                TEST_JDK, "lib", "management-agent.jar"
            );
        }
        if (!isFileOk(agentPath)) {
            System.err.println("Can not locate management-agent.jar");
            return null;
        }
        return agentPath;
    }

    private static boolean isFileOk(Path path) {
        return Files.isRegularFile(path) && Files.isReadable(path);
    }

    private static boolean doTest(String testId, String arg) throws Exception {
        List<String> args = new ArrayList<>();
        args.add("-cp");
        args.add(TEST_CLASSPATH);

        if (arg != null) {
            args.add(arg);
        }
        args.add("TestApplication");
        ProcessBuilder server = ProcessTools.createJavaProcessBuilder(
            args.toArray(new String[args.size()])
        );

        Process serverPrc = null, clientPrc = null;
        try {
            final AtomicReference<String> port = new AtomicReference<>();
            final AtomicReference<String> pid = new AtomicReference<>();

            serverPrc = ProcessTools.startProcess(
                "TestApplication(" + testId + ")",
                server,
                (String line) -> {
                    if (line.startsWith("port:")) {
                         port.set(line.split("\\:")[1]);
                     } else  if (line.startsWith("pid:")) {
                         pid.set(line.split("\\:")[1]);
                     } else if (line.startsWith("waiting")) {
                         return true;
                     }
                     return false;
                },
                5,
                TimeUnit.SECONDS
            );

            System.out.println("Attaching test manager:");
            System.out.println("=========================");
            System.out.println("  PID           : " + pid.get());
            System.out.println("  shutdown port : " + port.get());

            ProcessBuilder client = ProcessTools.createJavaProcessBuilder(
                "-cp",
                TEST_CLASSPATH +
                    File.pathSeparator +
                    TEST_JDK +
                    File.separator +
                    "lib" +
                    File.separator +
                    "tools.jar",
                "TestManager",
                pid.get(),
                port.get(),
                "true"
            );

            clientPrc = ProcessTools.startProcess(
                "TestManager",
                client,
                (String line) -> line.startsWith("Starting TestManager for PID"),
                10,
                TimeUnit.SECONDS
            );

            int clientExitCode = clientPrc.waitFor();
            int serverExitCode = serverPrc.waitFor();
            return clientExitCode == 0 && serverExitCode == 0;
        } finally {
            if (clientPrc != null) {
                System.out.println("Stopping process " + clientPrc);
                clientPrc.destroy();
                clientPrc.waitFor();
            }
            if (serverPrc != null) {
                System.out.println("Stopping process " + serverPrc);
                serverPrc.destroy();
                serverPrc.waitFor();
            }
        }
    }
}

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