1 /* 2 * Copyright (c) 2016, 2019, 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.nio.file.Paths; 30 import java.security.AccessControlContext; 31 import java.security.AccessController; 32 import java.security.PrivilegedActionException; 33 import java.security.PrivilegedExceptionAction; 34 import java.time.LocalDateTime; 35 36 import jdk.jfr.RecordingState; 37 38 /** 39 * Class responsible for dumping recordings on exit 40 * 41 */ 42 final class ShutdownHook implements Runnable { 43 private final PlatformRecorder recorder; 44 Object tlabDummyObject; 45 46 ShutdownHook(PlatformRecorder recorder) { 47 this.recorder = recorder; 48 } 49 50 @Override 51 public void run() { 52 // this allocation is done in order to fetch a new TLAB before 53 // starting any "real" operations. In low memory situations, 54 // we would like to take an OOM as early as possible. 55 tlabDummyObject = new Object(); 56 57 for (PlatformRecording recording : recorder.getRecordings()) { 58 if (recording.getDumpOnExit() && recording.getState() == RecordingState.RUNNING) { 59 dump(recording); 60 } 61 } 62 recorder.destroy(); 63 } 64 65 private void dump(PlatformRecording recording) { 66 try { 67 WriteableUserPath dest = recording.getDestination(); 68 if (dest == null) { 69 dest = makeDumpOnExitPath(recording); 70 } 71 if (dest != null) { 72 recording.stop("Dump on exit", dest); 73 } 74 } catch (Exception e) { 75 Logger.log(LogTag.JFR, LogLevel.DEBUG, () -> "Could not dump recording " + recording.getName() + " on exit."); 76 } 77 } 78 79 private WriteableUserPath makeDumpOnExitPath(PlatformRecording recording) { 80 try { 81 String pid = JVM.getJVM().getPid(); 82 String dfText = Repository.REPO_DATE_FORMAT.format(LocalDateTime.now()); 83 String name = "hotspot-" + "pid-" + pid + "-id-" + recording.getId() + "-" + dfText + ".jfr"; 84 AccessControlContext acc = recording.getNoDestinationDumpOnExitAccessControlContext(); 85 return AccessController.doPrivileged(new PrivilegedExceptionAction<WriteableUserPath>() { 86 @Override 87 public WriteableUserPath run() throws Exception { 88 return new WriteableUserPath(Paths.get(".", name)); 89 } 90 }, acc); 91 } catch (PrivilegedActionException e) { 92 Throwable t = e.getCause(); 93 if (t instanceof SecurityException) { 94 Logger.log(LogTag.JFR, LogLevel.WARN, "Not allowed to create dump path for recording " + recording.getId() + " on exit. " + e.getMessage()); 95 } 96 if (t instanceof IOException) { 97 Logger.log(LogTag.JFR, LogLevel.WARN, "Could not dump " + recording.getId() + " on exit. " + e.getMessage()); 98 } 99 return null; 100 } 101 } 102 103 static final class ExceptionHandler implements Thread.UncaughtExceptionHandler { 104 public void uncaughtException(Thread t, Throwable e) { 105 JVM.getJVM().uncaughtException(t, e); 106 } 107 } 108 }