ThreadMXBean.dumpAllThreads（）maxDepth

Question

我正在嘗試編寫一些線程管理實用程序，並閱讀ThreadMXBean。

http://download.oracle.com/javase/6/docs/api/java/lang/management/ThreadMXBean.html#dumpAllThreads(boolean, boolean)

根據商務部，getThreadInfo（長[] IDS，詮釋MAXDEPTH）「沒有獲得鎖定的監視器和線程鎖定同步」，然而，這些方法允許您指定true獲取鎖定/監視器信息似乎無法使您指定maxDepth。

有什麼我可以做的，以指定是否獲得顯示器/鎖定信息以及堆棧深度？

在此先感謝！

Answer 1

您可以複製從一個ThreadInfo了toString（），但除去堆棧深度的限制給你：

public String dump(ThreadInfo info) { 

     StringBuilder sb = new StringBuilder("\"" + info.getThreadName() + "\"" 
       + " Id=" + info.getThreadId() + " " + info.getThreadState()); 
     if (info.getLockName() != null) { 
      sb.append(" on " + info.getLockName()); 
     } 
     if (info.getLockOwnerName() != null) { 
      sb.append(" owned by \"" + info.getLockOwnerName() + "\" Id=" 
        + info.getLockOwnerId()); 
     } 
     if (info.isSuspended()) { 
      sb.append(" (suspended)"); 
     } 
     if (info.isInNative()) { 
      sb.append(" (in native)"); 
     } 
     sb.append('\n'); 
     int i = 0; 
     for (; i < info.getStackTrace().length; i++) { 
      StackTraceElement ste = info.getStackTrace()[i]; 
      sb.append("\tat " + ste.toString()); 
      sb.append('\n'); 
      if (i == 0 && info.getLockInfo() != null) { 
       Thread.State ts = info.getThreadState(); 
       switch (ts) { 
       case BLOCKED: 
        sb.append("\t- blocked on " + info.getLockInfo()); 
        sb.append('\n'); 
        break; 
       case WAITING: 
        sb.append("\t- waiting on " + info.getLockInfo()); 
        sb.append('\n'); 
        break; 
       case TIMED_WAITING: 
        sb.append("\t- waiting on " + info.getLockInfo()); 
        sb.append('\n'); 
        break; 
       default: 
       } 
      } 

      for (MonitorInfo mi : info.getLockedMonitors()) { 
       if (mi.getLockedStackDepth() == i) { 
        sb.append("\t- locked " + mi); 
        sb.append('\n'); 
       } 
      } 
     } 
     if (i < info.getStackTrace().length) { 
      sb.append("\t..."); 
      sb.append('\n'); 
     } 

     LockInfo[] locks = info.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(); 
    } 

然後調用來自ThreadMxBean.dumpAllThreads（）