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 * Copyright (c) 2017, 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

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/*

 * @test

 * @summary Test JVM's awareness of cpu sets (cpus and mems)

 * @requires docker.support

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.management

 *          jdk.jartool/sun.tools.jar

 * @build Common AttemptOOM CPUSetsReader sun.hotspot.WhiteBox PrintContainerInfo

 * @run driver ClassFileInstaller -jar whitebox.jar sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run driver TestCPUSets

 */

import java.util.List;

import jdk.test.lib.containers.docker.DockerRunOptions;

import jdk.test.lib.containers.docker.DockerTestUtils;

import jdk.test.lib.Asserts;

import jdk.test.lib.Platform;

import jdk.test.lib.Utils;

import jdk.test.lib.process.OutputAnalyzer;

public class TestCPUSets {

    private static final String imageName = Common.imageName("cpusets");

    public static void main(String[] args) throws Exception {

        if (!DockerTestUtils.canTestDocker()) {

            return;

        }

        Common.prepareWhiteBox();

        DockerTestUtils.buildJdkDockerImage(imageName, "Dockerfile-BasicTest", "jdk-docker");

        try {

            // Sanity test the cpu sets reader and parser

            CPUSetsReader.test();

            testTheSet("Cpus_allowed_list");

            testTheSet("Mems_allowed_list");

        } finally {

            DockerTestUtils.removeDockerImage(imageName);

        }

    }

    private static void testTheSet(String setType) throws Exception {

        String cpuSetStr = CPUSetsReader.readFromProcStatus(setType);

        if (cpuSetStr == null) {

            System.out.printf("The %s test is skipped %n", setType);

        } else {

            List<Integer> cpuSet = CPUSetsReader.parseCpuSet(cpuSetStr);

            // Test subset of one, full subset, and half of the subset

            testCpuSet(CPUSetsReader.listToString(cpuSet, 1));

            if (cpuSet.size() > 1) {

                testCpuSet(CPUSetsReader.listToString(cpuSet));

            }

            if (cpuSet.size() > 2) {

                testCpuSet(CPUSetsReader.listToString(cpuSet, cpuSet.size()/2 ));

            }

        }

    }

    private static DockerRunOptions commonOpts() {

        DockerRunOptions opts = new DockerRunOptions(imageName, "/jdk/bin/java",

                                                     "PrintContainerInfo");

        opts.addDockerOpts("--volume", Utils.TEST_CLASSES + ":/test-classes/");

        opts.addJavaOpts("-Xlog:os+container=trace", "-cp", "/test-classes/");

        Common.addWhiteBoxOpts(opts);

        return opts;

    }

    private static void checkResult(List<String> lines, String lineMarker, String value) {

        boolean lineMarkerFound = false;

        for (String line : lines) {

            if (line.contains(lineMarker)) {

                lineMarkerFound = true;

                String[] parts = line.split(":");

                System.out.println("DEBUG: line = " + line);

                System.out.println("DEBUG: parts.length = " + parts.length);

                Asserts.assertEquals(parts.length, 2);

                String set = parts[1].replaceAll("\\s","");

                String actual = CPUSetsReader.listToString(CPUSetsReader.parseCpuSet(set));

                Asserts.assertEquals(actual, value);

                break;

            }

        }

        Asserts.assertTrue(lineMarkerFound);

    }

    private static void testCpuSet(String value) throws Exception {

        Common.logNewTestCase("cpusets.cpus, value = " + value);

        DockerRunOptions opts = commonOpts();

        opts.addDockerOpts("--cpuset-cpus=" + value);

        List<String> lines = Common.run(opts).asLines();

        checkResult(lines, "cpuset.cpus is:", value);

    }

    private static void testMemSet(String value) throws Exception {

        Common.logNewTestCase("cpusets.mems, value = " + value);

        DockerRunOptions opts = commonOpts();

        opts.addDockerOpts("--cpuset-mems=" + value);

        List<String> lines = Common.run(opts).asLines();

        checkResult(lines, "cpuset.mems is:", value);

    }

}