alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (management.hpp)

This example Java source code file (management.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

allstatic, growablearray, klass, management\:\:record_vm_startup_time, not_management_return_, oopclosure, perfvariable, share_vm_services_management_hpp, stackobj, threadsnapshot, timestamp, tracevmcreationtime, traps

The management.hpp Java example source code

/*
 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_VM_SERVICES_MANAGEMENT_HPP
#define SHARE_VM_SERVICES_MANAGEMENT_HPP

#include "memory/allocation.hpp"
#include "runtime/handles.hpp"
#include "runtime/timer.hpp"
#include "services/jmm.h"

class OopClosure;
class ThreadSnapshot;

class Management : public AllStatic {
private:
  static PerfVariable*      _begin_vm_creation_time;
  static PerfVariable*      _end_vm_creation_time;
  static PerfVariable*      _vm_init_done_time;
  static jmmOptionalSupport _optional_support;
  static TimeStamp          _stamp; // Timestamp since vm init done time

  // Management klasses
  static Klass*             _sensor_klass;
  static Klass*             _threadInfo_klass;
  static Klass*             _memoryUsage_klass;
  static Klass*             _memoryPoolMXBean_klass;
  static Klass*             _memoryManagerMXBean_klass;
  static Klass*             _garbageCollectorMXBean_klass;
  static Klass*             _managementFactory_klass;
  static Klass*             _garbageCollectorImpl_klass;
  static Klass*             _diagnosticCommandImpl_klass;
  static Klass*             _managementFactoryHelper_klass;
  static Klass*             _gcInfo_klass;

  static Klass* load_and_initialize_klass(Symbol* sh, TRAPS);

public:
  static void init();
  static void initialize(TRAPS);

  static jlong ticks_to_ms(jlong ticks) NOT_MANAGEMENT_RETURN_(0L);
  static jlong timestamp() NOT_MANAGEMENT_RETURN_(0L);

  static void  oops_do(OopClosure* f) NOT_MANAGEMENT_RETURN;
  static void* get_jmm_interface(int version);
  static void  get_optional_support(jmmOptionalSupport* support);

  static void get_loaded_classes(JavaThread* cur_thread, GrowableArray<KlassHandle>* klass_handle_array);

  static void  record_vm_startup_time(jlong begin, jlong duration)
      NOT_MANAGEMENT_RETURN;
  static void  record_vm_init_completed() {
    // Initialize the timestamp to get the current time
    _vm_init_done_time->set_value(os::javaTimeMillis());

    // Update the timestamp to the vm init done time
    _stamp.update();
  }

  static jlong begin_vm_creation_time() {
    return _begin_vm_creation_time->get_value();
  }
  static jlong vm_init_done_time() {
    return _vm_init_done_time->get_value();
  }

  // methods to return a Klass*.
  static Klass* java_lang_management_ThreadInfo_klass(TRAPS);
  static Klass* java_lang_management_MemoryUsage_klass(TRAPS)
      NOT_MANAGEMENT_RETURN_(NULL);
  static Klass* java_lang_management_MemoryPoolMXBean_klass(TRAPS);
  static Klass* java_lang_management_MemoryManagerMXBean_klass(TRAPS);
  static Klass* java_lang_management_GarbageCollectorMXBean_klass(TRAPS);
  static Klass* sun_management_Sensor_klass(TRAPS)
      NOT_MANAGEMENT_RETURN_(NULL);
  static Klass* sun_management_ManagementFactory_klass(TRAPS)
      NOT_MANAGEMENT_RETURN_(NULL);
  static Klass* sun_management_GarbageCollectorImpl_klass(TRAPS)
      NOT_MANAGEMENT_RETURN_(NULL);
  static Klass* com_sun_management_GcInfo_klass(TRAPS)
      NOT_MANAGEMENT_RETURN_(NULL);
  static Klass* sun_management_DiagnosticCommandImpl_klass(TRAPS)
      NOT_MANAGEMENT_RETURN_(NULL);
  static Klass* sun_management_ManagementFactoryHelper_klass(TRAPS)
      NOT_MANAGEMENT_RETURN_(NULL);

  static instanceOop create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS);
  static instanceOop create_thread_info_instance(ThreadSnapshot* snapshot, objArrayHandle monitors_array, typeArrayHandle depths_array, objArrayHandle synchronizers_array, TRAPS);
};

class TraceVmCreationTime : public StackObj {
private:
  TimeStamp _timer;
  jlong     _begin_time;

public:
  TraceVmCreationTime() {}
  ~TraceVmCreationTime() {}

  void start()
  { _timer.update_to(0); _begin_time = os::javaTimeMillis(); }

  /**
   * Only call this if initialization completes successfully; it will
   * crash if PerfMemory_exit() has already been called (usually by
   * os::shutdown() when there was an initialization failure).
   */
  void end()
  { Management::record_vm_startup_time(_begin_time, _timer.milliseconds()); }

};

#endif // SHARE_VM_SERVICES_MANAGEMENT_HPP

Other Java examples (source code examples)

Here is a short list of links related to this Java management.hpp source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.