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/*
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* Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.jfr.internal;
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import java.io.IOException;
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import java.security.AccessControlContext;
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import java.security.AccessController;
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import java.security.PrivilegedActionException;
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import java.security.PrivilegedExceptionAction;
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import jdk.jfr.RecordingState;
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/**
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* Class responsible for dumping recordings on exit
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*
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*/
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final class ShutdownHook implements Runnable {
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private final PlatformRecorder recorder;
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Object tlabDummyObject;
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ShutdownHook(PlatformRecorder recorder) {
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this.recorder = recorder;
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}
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@Override
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public void run() {
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// this allocation is done in order to fetch a new TLAB before
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// starting any "real" operations. In low memory situations,
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// we would like to take an OOM as early as possible.
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tlabDummyObject = new Object();
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recorder.setInShutDown();
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for (PlatformRecording recording : recorder.getRecordings()) {
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if (recording.getDumpOnExit() && recording.getState() == RecordingState.RUNNING) {
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dump(recording);
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}
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}
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recorder.destroy();
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}
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private void dump(PlatformRecording recording) {
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try {
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WriteableUserPath dest = recording.getDestination();
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if (dest == null) {
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dest = makeDumpOnExitPath(recording);
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recording.setDestination(dest);
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}
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if (dest != null) {
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recording.stop("Dump on exit");
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}
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} catch (Exception e) {
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Logger.log(LogTag.JFR, LogLevel.DEBUG, () -> "Could not dump recording " + recording.getName() + " on exit.");
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}
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}
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private WriteableUserPath makeDumpOnExitPath(PlatformRecording recording) {
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try {
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String name = Utils.makeFilename(recording.getRecording());
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AccessControlContext acc = recording.getNoDestinationDumpOnExitAccessControlContext();
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return AccessController.doPrivileged(new PrivilegedExceptionAction<WriteableUserPath>() {
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@Override
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public WriteableUserPath run() throws Exception {
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return new WriteableUserPath(recording.getDumpOnExitDirectory().toPath().resolve(name));
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}
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}, acc);
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} catch (PrivilegedActionException e) {
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Throwable t = e.getCause();
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if (t instanceof SecurityException) {
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Logger.log(LogTag.JFR, LogLevel.WARN, "Not allowed to create dump path for recording " + recording.getId() + " on exit.");
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}
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if (t instanceof IOException) {
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Logger.log(LogTag.JFR, LogLevel.WARN, "Could not dump " + recording.getId() + " on exit.");
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}
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return null;
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}
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}
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static final class ExceptionHandler implements Thread.UncaughtExceptionHandler {
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public void uncaughtException(Thread t, Throwable e) {
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JVM.getJVM().uncaughtException(t, e);
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}
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}
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}
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