| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.pulsar.tests; |
| |
| import java.io.PrintWriter; |
| import java.io.StringWriter; |
| import java.lang.management.LockInfo; |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.MonitorInfo; |
| import java.lang.management.ThreadInfo; |
| import java.lang.management.ThreadMXBean; |
| import java.time.LocalDateTime; |
| import java.time.format.DateTimeFormatter; |
| import java.util.Map; |
| import javax.management.JMException; |
| import javax.management.ObjectName; |
| |
| /** |
| * Adapted from Hadoop TimedOutTestsListener. |
| * |
| * https://raw.githubusercontent.com/apache/hadoop/master/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/test/TimedOutTestsListener.java |
| */ |
| public class ThreadDumpUtil { |
| private static final String INDENT = " "; |
| |
| public static String buildThreadDiagnosticString() { |
| StringWriter sw = new StringWriter(); |
| PrintWriter output = new PrintWriter(sw); |
| |
| output.println(buildThreadDump()); |
| |
| String deadlocksInfo = buildDeadlockInfo(); |
| if (deadlocksInfo != null) { |
| output.println("====> DEADLOCKS DETECTED <===="); |
| output.println(); |
| output.println(deadlocksInfo); |
| } |
| |
| return sw.toString(); |
| } |
| |
| static String buildThreadDump() { |
| try { |
| // first attempt to use jcmd to do the thread dump, similar output to jstack |
| return callDiagnosticCommand("threadPrint", "-l"); |
| } catch (Exception ignore) { |
| } |
| |
| // fallback to using JMX for creating the thread dump |
| StringBuilder dump = new StringBuilder(); |
| |
| dump.append(String.format("Timestamp: %s", DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(LocalDateTime.now()))); |
| dump.append("\n\n"); |
| |
| Map<Thread, StackTraceElement[]> stackTraces = Thread.getAllStackTraces(); |
| for (Map.Entry<Thread, StackTraceElement[]> e : stackTraces.entrySet()) { |
| Thread thread = e.getKey(); |
| dump.append('\n'); |
| dump.append(String.format("\"%s\" %s prio=%d tid=%d %s\njava.lang.Thread.State: %s", thread.getName(), |
| (thread.isDaemon() ? "daemon" : ""), thread.getPriority(), thread.getId(), |
| Thread.State.WAITING.equals(thread.getState()) ? "in Object.wait()" : thread.getState().name(), |
| Thread.State.WAITING.equals(thread.getState()) ? "WAITING (on object monitor)" |
| : thread.getState())); |
| for (StackTraceElement stackTraceElement : e.getValue()) { |
| dump.append("\n at "); |
| dump.append(stackTraceElement); |
| } |
| dump.append("\n"); |
| } |
| return dump.toString(); |
| } |
| |
| /** |
| * Calls a diagnostic commands. |
| * The available operations are similar to what the jcmd commandline tool has, |
| * however the naming of the operations are different. The "help" operation can be used |
| * to find out the available operations. For example, the jcmd command "Thread.print" maps |
| * to "threadPrint" operation name. |
| */ |
| static String callDiagnosticCommand(String operationName, String... args) |
| throws JMException { |
| return (String) ManagementFactory.getPlatformMBeanServer() |
| .invoke(new ObjectName("com.sun.management:type=DiagnosticCommand"), |
| operationName, new Object[]{args}, new String[]{String[].class.getName()}); |
| } |
| |
| static String buildDeadlockInfo() { |
| ThreadMXBean threadBean = ManagementFactory.getThreadMXBean(); |
| long[] threadIds = threadBean.findMonitorDeadlockedThreads(); |
| if (threadIds != null && threadIds.length > 0) { |
| StringWriter stringWriter = new StringWriter(); |
| PrintWriter out = new PrintWriter(stringWriter); |
| |
| ThreadInfo[] infos = threadBean.getThreadInfo(threadIds, true, true); |
| for (ThreadInfo ti : infos) { |
| printThreadInfo(ti, out); |
| printLockInfo(ti.getLockedSynchronizers(), out); |
| out.println(); |
| } |
| |
| out.close(); |
| return stringWriter.toString(); |
| } else { |
| return null; |
| } |
| } |
| |
| private static void printThreadInfo(ThreadInfo ti, PrintWriter out) { |
| // print thread information |
| printThread(ti, out); |
| |
| // print stack trace with locks |
| StackTraceElement[] stacktrace = ti.getStackTrace(); |
| MonitorInfo[] monitors = ti.getLockedMonitors(); |
| for (int i = 0; i < stacktrace.length; i++) { |
| StackTraceElement ste = stacktrace[i]; |
| out.println(INDENT + "at " + ste.toString()); |
| for (MonitorInfo mi : monitors) { |
| if (mi.getLockedStackDepth() == i) { |
| out.println(INDENT + " - locked " + mi); |
| } |
| } |
| } |
| out.println(); |
| } |
| |
| private static void printThread(ThreadInfo ti, PrintWriter out) { |
| out.println(); |
| out.print("\"" + ti.getThreadName() + "\"" + " Id=" + ti.getThreadId() + " in " + ti.getThreadState()); |
| if (ti.getLockName() != null) { |
| out.print(" on lock=" + ti.getLockName()); |
| } |
| if (ti.isSuspended()) { |
| out.print(" (suspended)"); |
| } |
| if (ti.isInNative()) { |
| out.print(" (running in native)"); |
| } |
| out.println(); |
| if (ti.getLockOwnerName() != null) { |
| out.println(INDENT + " owned by " + ti.getLockOwnerName() + " Id=" + ti.getLockOwnerId()); |
| } |
| } |
| |
| private static void printLockInfo(LockInfo[] locks, PrintWriter out) { |
| out.println(INDENT + "Locked synchronizers: count = " + locks.length); |
| for (LockInfo li : locks) { |
| out.println(INDENT + " - " + li); |
| } |
| out.println(); |
| } |
| |
| } |