/*

 * Copyright (c) 2012, 2019, 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_JFR_PERIODIC_JFROSINTERFACE_HPP

#define SHARE_JFR_PERIODIC_JFROSINTERFACE_HPP

#include "jfr/utilities/jfrAllocation.hpp"

class CPUInformation;

class EnvironmentVariable;

class NetworkInterface;

class SystemProcess;

class JfrOSInterface: public JfrCHeapObj {

  friend class JfrRecorder;

 private:

  class JfrOSInterfaceImpl;

  JfrOSInterfaceImpl* _impl;

  JfrOSInterface();

  ~JfrOSInterface();

  bool initialize();

  static JfrOSInterface& instance();

  static JfrOSInterface* create();

  static void destroy();

 public:

  static int cpu_information(CPUInformation& cpu_info);

  static int cpu_load(int which_logical_cpu, double* cpu_load);

  static int context_switch_rate(double* rate);

  static int cpu_load_total_process(double* cpu_load);

  static int cpu_loads_process(double* pjvmUserLoad, double* pjvmKernelLoad, double* psystemTotalLoad);

  static int os_version(char** os_version);

  static int generate_initial_environment_variable_events();

  static int system_processes(SystemProcess** system_processes, int* no_of_sys_processes);

  static int network_utilization(NetworkInterface** network_interfaces);

};

#endif // SHARE_JFR_PERIODIC_JFROSINTERFACE_HPP