/*

 * Copyright (c) 2016, 2018, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.jfr.internal;

import java.io.IOException;

import java.nio.file.Paths;

import java.security.AccessControlContext;

import java.security.AccessController;

import java.security.PrivilegedActionException;

import java.security.PrivilegedExceptionAction;

import java.time.LocalDateTime;

import jdk.jfr.RecordingState;

/**

 * Class responsible for dumping recordings on exit

 *

 */

final class ShutdownHook implements Runnable {

    private final PlatformRecorder recorder;

    Object tlabDummyObject;

    ShutdownHook(PlatformRecorder recorder) {

        this.recorder = recorder;

    }

    @Override

    public void run() {

        // this allocation is done in order to fetch a new TLAB before

        // starting any "real" operations. In low memory situations,

        // we would like to take an OOM as early as possible.

        tlabDummyObject = new Object();

        for (PlatformRecording recording : recorder.getRecordings()) {

            if (recording.getDumpOnExit() && recording.getState() == RecordingState.RUNNING) {

                dump(recording);

            }

        }

        recorder.destroy();

    }

    private void dump(PlatformRecording recording) {

        try {

            WriteableUserPath dest = recording.getDestination();

            if (dest == null) {

                dest = makeDumpOnExitPath(recording);

            }

            if (dest != null) {

                recording.stop("Dump on exit", dest);

            }

        } catch (Exception e) {

            Logger.log(LogTag.JFR, LogLevel.DEBUG, () -> "Could not dump recording " + recording.getName() + " on exit.");

        }

    }

    private WriteableUserPath makeDumpOnExitPath(PlatformRecording recording) {

        try {

            String pid = JVM.getJVM().getPid();

            String dfText = Repository.REPO_DATE_FORMAT.format(LocalDateTime.now());

            String name = "hotspot-" + "pid-" + pid + "-id-" + recording.getId() + "-" + dfText + ".jfr";

            AccessControlContext acc = recording.getNoDestinationDumpOnExitAccessControlContext();

            return AccessController.doPrivileged(new PrivilegedExceptionAction<WriteableUserPath>() {

                @Override

                public WriteableUserPath run() throws Exception {

                    return new WriteableUserPath(Paths.get(".", name));

                }

            }, acc);

        } catch (PrivilegedActionException e) {

            Throwable t = e.getCause();

            if (t instanceof SecurityException) {

                Logger.log(LogTag.JFR, LogLevel.WARN, "Not allowed to create dump path for recording " + recording.getId() + " on exit. " + e.getMessage());

            }

            if (t instanceof IOException) {

                Logger.log(LogTag.JFR, LogLevel.WARN, "Could not dump " + recording.getId() + " on exit. " + e.getMessage());

            }

            return null;

        }

    }

    static final class ExceptionHandler implements Thread.UncaughtExceptionHandler {

        public void uncaughtException(Thread t, Throwable e) {

            JVM.getJVM().uncaughtException(t, e);

        }

    }

}