/*
 * Copyright (c) 2019, 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.
 */


/*
 * @test
 * @summary Ensure that certain JFR events return correct results for resource values
 *          when run inside Docker container, such as available CPU and memory.
 *          Also make sure that PIDs are based on value provided by container,
 *          not by the host system.
 * @requires (docker.support & os.maxMemory >= 2g)
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 *          jdk.jartool/sun.tools.jar
 * @build JfrReporter
 * @run driver TestJFREvents
 */
import jdk.test.lib.containers.docker.Common;
import jdk.test.lib.containers.docker.DockerRunOptions;
import jdk.test.lib.containers.docker.DockerTestUtils;
import jdk.test.lib.Utils;


public class TestJFREvents {
    private static final String imageName = Common.imageName("jfr-events");
    private static final int availableCPUs = Runtime.getRuntime().availableProcessors();

    public static void main(String[] args) throws Exception {
        System.out.println("Test Environment: detected availableCPUs = " + availableCPUs);
        if (!DockerTestUtils.canTestDocker()) {
            return;
        }

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

        try {
            // leave one CPU for system and tools, otherwise this test may be unstable
            int maxNrOfAvailableCpus =  availableCPUs - 1;
            for (int i=1; i < maxNrOfAvailableCpus; i = i * 2) {
                testCPUInfo(i, i);
            }

            long MB = 1024*1024;
            testMemory("200m", "" + 200*MB);
            testMemory("500m", "" + 500*MB);
            testMemory("1g", "" + 1024*MB);

            testProcessInfo();

        } finally {
            DockerTestUtils.removeDockerImage(imageName);
        }
    }


    private static void testCPUInfo(int valueToSet, int expectedValue) throws Exception {
        Common.logNewTestCase("CPUInfo: --cpus = " + valueToSet);
        DockerTestUtils.dockerRunJava(
                                      commonDockerOpts()
                                      .addDockerOpts("--cpus=" + valueToSet)
                                      .addClassOptions(JfrReporter.TESTCASE_CPU))
            .shouldHaveExitValue(0)
            .shouldContain(JfrReporter.TEST_REPORTED_CORES);

        // The following assertion is currently disabled due to JFR reporting incorrect values.
        // JFR reports values for the host system as opposed to values for the container.
        // @ignore 8219999
        // .shouldContain(JfrReporter.TEST_REPORTED_CORES + "=" + expectedValue);
    }


    private static void testMemory(String valueToSet, String expectedValue) throws Exception {
        Common.logNewTestCase("Memory: --memory = " + valueToSet);
        DockerTestUtils.dockerRunJava(
                                      commonDockerOpts()
                                      .addDockerOpts("--memory=" + valueToSet)
                                      .addClassOptions(JfrReporter.TESTCASE_MEMORY))
            .shouldHaveExitValue(0)
            .shouldContain(JfrReporter.TEST_REPORTED_MEMORY + "=" + expectedValue);
    }


    private static void testProcessInfo() throws Exception {
        Common.logNewTestCase("ProcessInfo");
        DockerTestUtils.dockerRunJava(
                                      commonDockerOpts()
                                      .addClassOptions(JfrReporter.TESTCASE_PROCESS))
            .shouldHaveExitValue(0)
            .shouldContain(JfrReporter.TEST_REPORTED_PID + "=1");

    }


    private static DockerRunOptions commonDockerOpts() {
        return new DockerRunOptions(imageName, "/jdk/bin/java", "JfrReporter")
            .addDockerOpts("--volume", Utils.TEST_CLASSES + ":/test-classes/")
            .addJavaOpts("-cp", "/test-classes/");
    }
}