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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package jdk.jfr.internal;

import java.io.IOException;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;

import jdk.jfr.RecordingState;

Class responsible for dumping recordings on exit
/** * 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(); recorder.setInShutDown(); 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); recording.setDestination(dest); } if (dest != null) { recording.stop("Dump on exit"); } } catch (Exception e) { if (Logger.shouldLog(LogTag.JFR, LogLevel.DEBUG)) { Logger.log(LogTag.JFR, LogLevel.DEBUG, "Could not dump recording " + recording.getName() + " on exit."); } } } private WriteableUserPath makeDumpOnExitPath(PlatformRecording recording) { try { String name = Utils.makeFilename(recording.getRecording()); AccessControlContext acc = recording.getNoDestinationDumpOnExitAccessControlContext(); return AccessController.doPrivileged(new PrivilegedExceptionAction<WriteableUserPath>() { @Override public WriteableUserPath run() throws Exception { return new WriteableUserPath(recording.getDumpOnExitDirectory().toPath().resolve(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."); } if (t instanceof IOException) { Logger.log(LogTag.JFR, LogLevel.WARN, "Could not dump " + recording.getId() + " on exit."); } return null; } } static final class ExceptionHandler implements Thread.UncaughtExceptionHandler { public void uncaughtException(Thread t, Throwable e) { JVM.getJVM().uncaughtException(t, e); } } }