1 /*
   2  * Copyright (c) 2003, 2004, 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 sun.management;
  27 
  28 import sun.management.counter.Counter;
  29 
  30 /**
  31  * Hotspot internal management interface for the thread system.
  32  */
  33 public interface HotspotThreadMBean {
  34 
  35     /**
  36      * Returns the current number of VM internal threads.
  37      *
  38      * @return the current number of VM internal threads.
  39      */
  40     public int getInternalThreadCount();
  41 
  42     /**
  43      * Returns a <tt>Map</tt> of the name of all VM internal threads
  44      * to the thread CPU time in nanoseconds.  The returned value is
  45      * of nanoseconds precision but not necessarily nanoseconds accuracy.
  46      * <p>
  47      *
  48      * @return a <tt>Map</tt> object of the name of all VM internal threads
  49      * to the thread CPU time in nanoseconds.
  50      *
  51      * @throws java.lang.UnsupportedOperationException if the Java virtual
  52      * machine does not support CPU time measurement.
  53      *
  54      * @see java.lang.management.ThreadMBean#isThreadCpuTimeSupported
  55      */
  56     public java.util.Map<String,Long> getInternalThreadCpuTimes();
  57 
  58     /**
  59      * Returns a list of internal counters maintained in the Java
  60      * virtual machine for the thread system.
  61      *
  62      * @return a list of internal counters maintained in the VM
  63      * for the thread system.
  64      */
  65     public java.util.List<Counter> getInternalThreadingCounters();
  66 }