text: /*
   * Copyright (c) 2003, 2011, 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 klassOop           _sensor_klass;
    static klassOop           _threadInfo_klass;
    static klassOop           _memoryUsage_klass;
    static klassOop           _memoryPoolMXBean_klass;
    static klassOop           _memoryManagerMXBean_klass;
    static klassOop           _garbageCollectorMXBean_klass;
    static klassOop           _managementFactory_klass;
    static klassOop           _garbageCollectorImpl_klass;
    static klassOop           _gcInfo_klass;
  
    static klassOop load_and_initialize_klass(Symbol* sh, TRAPS);
  
  public:
    static void init();
    static void initialize(TRAPS);
  
    static jlong ticks_to_ms(jlong ticks);
    static jlong timestamp();
  
    static void  oops_do(OopClosure* f);
    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);
    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 klassOop.
    static klassOop java_lang_management_ThreadInfo_klass(TRAPS);
    static klassOop java_lang_management_MemoryUsage_klass(TRAPS);
    static klassOop java_lang_management_MemoryPoolMXBean_klass(TRAPS);
    static klassOop java_lang_management_MemoryManagerMXBean_klass(TRAPS);
    static klassOop java_lang_management_GarbageCollectorMXBean_klass(TRAPS);
    static klassOop sun_management_Sensor_klass(TRAPS);
    static klassOop sun_management_ManagementFactory_klass(TRAPS);
    static klassOop sun_management_GarbageCollectorImpl_klass(TRAPS);
    static klassOop com_sun_management_GcInfo_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
  