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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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).

 *

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package jdk.jfr.event.runtime;

import java.io.IOException;

import java.lang.reflect.Field;

import java.nio.file.Paths;

import java.util.Comparator;

import java.util.List;

import java.util.stream.Collectors;

import jdk.jfr.consumer.RecordedEvent;

import jdk.jfr.consumer.RecordedFrame;

import jdk.jfr.consumer.RecordedStackTrace;

import jdk.jfr.consumer.RecordingFile;

import jdk.test.lib.Asserts;

import jdk.test.lib.Platform;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.jfr.EventNames;

import jdk.test.lib.jfr.Events;

import sun.misc.Unsafe;

/**

 * @test

 * @summary Test Shutdown event

 * @key jfr

 * @requires vm.hasJFR

 * @library /test/lib

 * @modules jdk.jfr

 * @run main jdk.jfr.event.runtime.TestShutdownEvent

 */

public class TestShutdownEvent {

    private static ShutdownEventSubTest subTests[] = {

             new TestLastNonDaemon(),

             new TestSystemExit(),

             new TestVMCrash(),

             new TestUnhandledException(),

             new TestRuntimeHalt(),

             new TestSig("TERM"),

             new TestSig("HUP"),

             new TestSig("INT")};

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

        for (int i = 0; i < subTests.length; ++i) {

            if (subTests[i].isApplicable()) {

                runSubtest(i);

            } else {

                System.out.println("Skipping non-applicable test: " + i);

            }

        }

    }

    private static void runSubtest(int subTestIndex) throws Exception {

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(true,

                                "-Xlog:jfr=debug",

                                "-XX:-CreateCoredumpOnCrash",

                                "-XX:StartFlightRecording=filename=./dumped.jfr,dumponexit=true,settings=default",

                                "jdk.jfr.event.runtime.TestShutdownEvent$TestMain",

                                String.valueOf(subTestIndex));

        OutputAnalyzer output = ProcessTools.executeProcess(pb);

        System.out.println(output.getOutput());

        System.out.println("Exit code: " + output.getExitValue());

        String recordingName = output.firstMatch("emergency jfr file: (.*.jfr)", 1);

        if (recordingName == null) {

            recordingName = "./dumped.jfr";

        }

        List<RecordedEvent> events = RecordingFile.readAllEvents(Paths.get(recordingName));

        List<RecordedEvent> filteredEvents = events.stream()

            .filter(e -> e.getEventType().getName().equals(EventNames.Shutdown))

            .sorted(Comparator.comparing(RecordedEvent::getStartTime))

            .collect(Collectors.toList());

        Asserts.assertEquals(filteredEvents.size(), 1);

        RecordedEvent event = filteredEvents.get(0);

        subTests[subTestIndex].verifyEvents(event);

    }

    @SuppressWarnings("unused")

    private static class TestMain {

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

            ShutdownEventSubTest subTest = subTests[Integer.parseInt(args[0])];

            System.out.println("Running subtest " + args[0] + " (" + subTest.getClass().getName() + ")");

            subTest.runTest();

        }

    }

    private interface ShutdownEventSubTest {

        default boolean isApplicable() {

            return true;

        }

        void runTest();

        void verifyEvents(RecordedEvent event);

    }

    public static Unsafe getUnsafe() {

        try {

            Field f = Unsafe.class.getDeclaredField("theUnsafe");

            f.setAccessible(true);

            return (Unsafe)f.get(null);

        } catch (Exception e) {

            Asserts.fail("Could not access Unsafe");

        }

        return null;

    }

    // Basic stack trace validation, checking that the runTest method is part of the stack

    static void validateStackTrace(RecordedStackTrace stackTrace) {

        List<RecordedFrame> frames = stackTrace.getFrames();

        Asserts.assertFalse(frames.isEmpty());

        Asserts.assertTrue(frames.stream()

                           .anyMatch(t -> t.getMethod().getName().equals("runTest")));

    }

    // =========================================================================

    private static class TestLastNonDaemon implements ShutdownEventSubTest {

        @Override

        public void runTest() {

            // Do nothing - this is the default exit reason

        }

        @Override

        public void verifyEvents(RecordedEvent event) {

            Events.assertField(event, "reason").equal("No remaining non-daemon Java threads");

        }

    }

    private static class TestSystemExit implements ShutdownEventSubTest {

        @Override

        public void runTest() {

            System.out.println("Running System.exit");

            System.exit(42);

        }

        @Override

        public void verifyEvents(RecordedEvent event) {

            Events.assertField(event, "reason").equal("Shutdown requested from Java");

            validateStackTrace(event.getStackTrace());

        }

    }

    private static class TestVMCrash implements ShutdownEventSubTest {

        @Override

        public void runTest() {

            System.out.println("Attempting to crash");

            getUnsafe().putInt(0L, 0);

        }

        @Override

        public void verifyEvents(RecordedEvent event) {

            Events.assertField(event, "reason").equal("VM Error");

            validateStackTrace(event.getStackTrace());

        }

    }

    private static class TestUnhandledException implements ShutdownEventSubTest {

        @Override

        public void runTest() {

            throw new RuntimeException("Unhandled");

        }

        @Override

        public void verifyEvents(RecordedEvent event) {

            Events.assertField(event, "reason").equal("No remaining non-daemon Java threads");

        }

    }

    private static class TestRuntimeHalt implements ShutdownEventSubTest {

        @Override

        public void runTest() {

            System.out.println("Running Runtime.getRuntime.halt");

            Runtime.getRuntime().halt(17);

        }

        @Override

        public void verifyEvents(RecordedEvent event) {

            Events.assertField(event, "reason").equal("Shutdown requested from Java");

            validateStackTrace(event.getStackTrace());

        }

    }

    private static class TestSig implements ShutdownEventSubTest {

        private final String signalName;

        @Override

        public boolean isApplicable() {

            if (Platform.isWindows()) {

                return false;

            }

            if (signalName.equals("HUP") && Platform.isSolaris()) {

                return false;

            }

            return true;

        }

        public TestSig(String signalName) {

            this.signalName = signalName;

        }

        @Override

        public void runTest() {

            System.out.println("Sending SIG" + signalName + " to process " + ProcessHandle.current().pid());

            try {

                Runtime.getRuntime().exec("kill -" + signalName + " " + ProcessHandle.current().pid()).waitFor();

                Thread.sleep(60_1000);

            } catch (InterruptedException e) {

                e.printStackTrace();

            } catch (IOException e) {

                e.printStackTrace();

            }

            Asserts.fail("Process survived the SIG" + signalName + " signal!");

        }

        @Override

        public void verifyEvents(RecordedEvent event) {

            Events.assertField(event, "reason").equal("Shutdown requested from Java");

            Events.assertEventThread(event);

            Asserts.assertEquals(event.getThread().getJavaName(), "SIG" + signalName + " handler");

        }

    }

}