content: /*
   * 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.activemq.artemis.utils;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import java.lang.invoke.MethodHandles;
  
  import java.io.IOException;
  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;
  
  public final class ThreadDumpUtil {
     private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
     public static String threadDump(final String msg) {
  
        try (
           StringWriter str = new StringWriter();
           PrintWriter out = new PrintWriter(str)
        ) {
  
           ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
  
           out.println("*******************************************************************************");
           out.println("Complete Thread dump " + msg);
  
           for (ThreadInfo threadInfo : threadMXBean.dumpAllThreads(true, true)) {
              out.println(threadInfoToString(threadInfo));
           }
  
           long[] deadlockedThreads = threadMXBean.findDeadlockedThreads();
  
           if (deadlockedThreads != null && deadlockedThreads.length > 0) {
              out.println("Deadlock detected!");
              out.println();
  
              for (ThreadInfo threadInfo : threadMXBean.getThreadInfo(deadlockedThreads, true, true)) {
                 out.println(threadInfoToString(threadInfo));
              }
           }
  
           out.println("===============================================================================");
           out.println("End Thread dump " + msg);
           out.println("*******************************************************************************");
  
           return str.toString();
  
        } catch (IOException e) {
           logger.error("Exception thrown during generating of thread dump.", e);
        }
  
        return "Generating of thread dump failed " + msg;
  
     }
  
     private static String threadInfoToString(ThreadInfo threadInfo) {
        StringBuilder sb = new StringBuilder("\"" + threadInfo.getThreadName() + "\"" +
              " Id=" + threadInfo.getThreadId() + " " +
              threadInfo.getThreadState());
        if (threadInfo.getLockName() != null) {
           sb.append(" on " + threadInfo.getLockName());
        }
        if (threadInfo.getLockOwnerName() != null) {
           sb.append(" owned by \"" + threadInfo.getLockOwnerName() +
                 "\" Id=" + threadInfo.getLockOwnerId());
        }
        if (threadInfo.isSuspended()) {
           sb.append(" (suspended)");
        }
        if (threadInfo.isInNative()) {
           sb.append(" (in native)");
        }
        sb.append('\n');
        int i = 0;
        for (; i < threadInfo.getStackTrace().length; i++) {
           StackTraceElement ste = threadInfo.getStackTrace()[i];
           sb.append("\tat " + ste.toString());
           sb.append('\n');
           if (i == 0 && threadInfo.getLockInfo() != null) {
              Thread.State ts = threadInfo.getThreadState();
              switch (ts) {
                 case BLOCKED:
                    sb.append("\t-  blocked on " + threadInfo.getLockInfo());
                    sb.append('\n');
                    break;
                 case WAITING:
                 case TIMED_WAITING:
                    sb.append("\t-  waiting on " + threadInfo.getLockInfo());
                    sb.append('\n');
                    break;
                 default:
              }
           }
  
           for (MonitorInfo mi : threadInfo.getLockedMonitors()) {
              if (mi.getLockedStackDepth() == i) {
                 sb.append("\t-  locked " + mi);
                 sb.append('\n');
              }
           }
        }
  
        LockInfo[] locks = threadInfo.getLockedSynchronizers();
        if (locks.length > 0) {
           sb.append("\n\tNumber of locked synchronizers = " + locks.length);
           sb.append('\n');
           for (LockInfo li : locks) {
              sb.append("\t- " + li);
              sb.append('\n');
           }
        }
        sb.append('\n');
        return sb.toString();
     }
  
  }
  