/*

 * Copyright (c) 2003, 2012, 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*             _gcInfo_klass;

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

public:

  static void init();

  static void initialize(TRAPS);

  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_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_MemoryPoolMXBean_klass(TRAPS);

  static Klass* java_lang_management_MemoryManagerMXBean_klass(TRAPS);

  static Klass* java_lang_management_GarbageCollectorMXBean_klass(TRAPS);

  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