1 /* 2 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.jfr.internal; 27 28 import java.io.IOException; 29 import java.security.AccessControlContext; 30 import java.security.AccessController; 31 import java.security.PrivilegedActionException; 32 import java.security.PrivilegedExceptionAction; 33 34 import jdk.jfr.RecordingState; 35 36 /** 37 * Class responsible for dumping recordings on exit 38 * 39 */ 40 final class ShutdownHook implements Runnable { 41 private final PlatformRecorder recorder; 42 Object tlabDummyObject; 43 44 ShutdownHook(PlatformRecorder recorder) { 45 this.recorder = recorder; 46 } 47 48 @Override 49 public void run() { 50 // this allocation is done in order to fetch a new TLAB before 51 // starting any "real" operations. In low memory situations, 52 // we would like to take an OOM as early as possible. 53 tlabDummyObject = new Object(); 54 55 for (PlatformRecording recording : recorder.getRecordings()) { 56 if (recording.getDumpOnExit() && recording.getState() == RecordingState.RUNNING) { 57 dump(recording); 58 } 59 } 60 recorder.destroy(); 61 } 62 63 private void dump(PlatformRecording recording) { 64 try { 65 WriteableUserPath dest = recording.getDestination(); 66 if (dest == null) { 67 dest = makeDumpOnExitPath(recording); 68 recording.setDestination(dest); 69 } 70 if (dest != null) { 71 recording.stop("Dump on exit"); 72 } 73 } catch (Exception e) { 74 Logger.log(LogTag.JFR, LogLevel.DEBUG, () -> "Could not dump recording " + recording.getName() + " on exit."); 75 } 76 } 77 78 private WriteableUserPath makeDumpOnExitPath(PlatformRecording recording) { 79 try { 80 String name = Utils.makeFilename(recording.getRecording()); 81 AccessControlContext acc = recording.getNoDestinationDumpOnExitAccessControlContext(); 82 return AccessController.doPrivileged(new PrivilegedExceptionAction<WriteableUserPath>() { 83 @Override 84 public WriteableUserPath run() throws Exception { 85 return new WriteableUserPath(recording.getDumpOnExitDirectory().toPath().resolve(name)); 86 } 87 }, acc); 88 } catch (PrivilegedActionException e) { 89 Throwable t = e.getCause(); 90 if (t instanceof SecurityException) { 91 Logger.log(LogTag.JFR, LogLevel.WARN, "Not allowed to create dump path for recording " + recording.getId() + " on exit."); 92 } 93 if (t instanceof IOException) { 94 Logger.log(LogTag.JFR, LogLevel.WARN, "Could not dump " + recording.getId() + " on exit."); 95 } 96 return null; 97 } 98 } 99 100 static final class ExceptionHandler implements Thread.UncaughtExceptionHandler { 101 public void uncaughtException(Thread t, Throwable e) { 102 JVM.getJVM().uncaughtException(t, e); 103 } 104 } 105 }