/*

 * Copyright (c) 2012, 2018, 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 OS_WINDOWS_VM_PDH_INTERFACE_HPP

#define OS_WINDOWS_VM_PDH_INTERFACE_HPP

#include "memory/allocation.hpp"

#include <pdh.h>

#include <pdhmsg.h>

class PdhDll: public AllStatic {

 private:

  static LONG       _pdh_reference_count;

  static LONG       _critical_section;

  static LONG       _initialized;

  static HMODULE    _hModule;

  static void       initialize();

  static PDH_STATUS (WINAPI *_PdhAddCounter)(HQUERY, LPCSTR, DWORD, HCOUNTER*);

  static PDH_STATUS (WINAPI *_PdhOpenQuery)(LPCWSTR, DWORD, HQUERY*);

  static DWORD      (WINAPI *_PdhCloseQuery)(HQUERY);

  static PDH_STATUS (WINAPI *_PdhCollectQueryData)(HQUERY);

  static DWORD      (WINAPI *_PdhGetFormattedCounterValue)(HCOUNTER, DWORD, LPDWORD, PPDH_FMT_COUNTERVALUE);

  static PDH_STATUS (WINAPI *_PdhEnumObjectItems)(LPCTSTR, LPCTSTR, LPCTSTR, LPTSTR, LPDWORD, LPTSTR, LPDWORD, DWORD, DWORD);

  static PDH_STATUS (WINAPI *_PdhRemoveCounter)(HCOUNTER);

  static PDH_STATUS (WINAPI *_PdhLookupPerfNameByIndex)(LPCSTR, DWORD, LPSTR, LPDWORD);

  static PDH_STATUS (WINAPI *_PdhMakeCounterPath)(PPDH_COUNTER_PATH_ELEMENTS, LPTSTR, LPDWORD, DWORD);

 public:

  static PDH_STATUS PdhAddCounter(HQUERY, LPCSTR, DWORD, HCOUNTER*);

  static PDH_STATUS PdhOpenQuery(LPCWSTR, DWORD, HQUERY*);

  static DWORD      PdhCloseQuery(HQUERY);

  static PDH_STATUS PdhCollectQueryData(HQUERY);

  static DWORD      PdhGetFormattedCounterValue(HCOUNTER, DWORD, LPDWORD, PPDH_FMT_COUNTERVALUE);

  static PDH_STATUS PdhEnumObjectItems(LPCTSTR, LPCTSTR, LPCTSTR, LPTSTR, LPDWORD, LPTSTR, LPDWORD, DWORD, DWORD);

  static PDH_STATUS PdhRemoveCounter(HCOUNTER);

  static PDH_STATUS PdhLookupPerfNameByIndex(LPCSTR, DWORD, LPSTR, LPDWORD);

  static PDH_STATUS PdhMakeCounterPath(PPDH_COUNTER_PATH_ELEMENTS, LPTSTR, LPDWORD, DWORD);

  static bool       PdhStatusFail(PDH_STATUS pdhStat);

  static bool       PdhAttach();

  static bool       PdhDetach();

};

#endif // OS_WINDOWS_VM_PDH_INTERFACE_HPP