/*

 * 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.  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).

 *

 * 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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 */

package jdk.jfr.api.consumer.streaming;

import java.io.IOException;

import java.io.RandomAccessFile;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.Properties;

import jdk.internal.misc.Unsafe;

import jdk.jfr.Event;

import jdk.test.lib.process.ProcessTools;

import com.sun.tools.attach.VirtualMachine;

/**

 * Class that emits a NUMBER_OF_EVENTS and then awaits crash or exit

 *

 * Requires jdk.attach module.

 *

 */

    private static class TestEvent extends Event {

    }

    public final static int NUMBER_OF_EVENTS = 10;

    private final Process process;

    private final Path path;

    public TestProcess(String name) throws IOException {

        this.path = Paths.get("action-" + System.currentTimeMillis()).toAbsolutePath();

        String[] args = {

                "--add-exports",

                "java.base/jdk.internal.misc=ALL-UNNAMED",

                "-XX:StartFlightRecording:settings=none",

                TestProcess.class.getName(), path.toString()

            };

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(false, args);

        process = ProcessTools.startProcess(name, pb);

    }

    public static void main(String... args) throws Exception {

        for (int i = 0; i < NUMBER_OF_EVENTS; i++) {

            TestEvent e = new TestEvent();

            e.commit();

        }

        Path path = Paths.get(args[0]);

        while (true) {

            try {

                String action = Files.readString(path);

                if ("crash".equals(action)) {

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

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

                }

                if ("exit".equals(action)) {

                    System.out.println("About to exit...");

                    System.exit(0);

                }

            } catch (Exception ioe) {

                // Ignore

            }

            takeNap();

        }

    }

    public Path getRepository() {

        while (true) {

            try {

                VirtualMachine vm = VirtualMachine.attach(String.valueOf(process.pid()));

                Properties p = vm.getSystemProperties();

                vm.detach();

                String repo = (String) p.get("jdk.jfr.repository");

                if (repo != null) {

                    return Paths.get(repo);

                }

            } catch (Exception e) {

                System.out.println("Attach failed: " + e.getMessage());

                System.out.println("Retrying...");

            }

            takeNap();

        }

    }

    private static void takeNap() {

        try {

            Thread.sleep(10);

        } catch (InterruptedException ie) {

            // ignore

        }

    }

    public void crash() {

        try {

            Files.writeString(path, "crash");

        } catch (IOException ioe) {

            ioe.printStackTrace();

        }

    }

    public void exit() {

        try {

            Files.writeString(path, "exit");

        } catch (IOException ioe) {

            ioe.printStackTrace();

        }

    }

    public long pid() {

        return process.pid();

    }

}