/*

 * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.

 *

 * 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.

 *

 */

#include "precompiled.hpp"

#include "services/memoryService.hpp"

#include "gc/shared/generationCounters.hpp"

#include "gc/epsilon/epsilonMonitoringSupport.hpp"

#include "gc/epsilon/epsilonCollectedHeap.hpp"

class EpsilonSpaceCounters: public CHeapObj<mtGC> {

  friend class VMStructs;

private:

  PerfVariable* _capacity;

  PerfVariable* _used;

  char*         _name_space;

public:

  EpsilonSpaceCounters(const char* name,

                 int ordinal,

                 size_t max_size,

                 size_t initial_capacity,

                 GenerationCounters* gc) {

    if (UsePerfData) {

      EXCEPTION_MARK;

      ResourceMark rm;

      const char* cns = PerfDataManager::name_space(gc->name_space(), "space", ordinal);

      _name_space = NEW_C_HEAP_ARRAY(char, strlen(cns)+1, mtGC);

      strcpy(_name_space, cns);

      const char* cname = PerfDataManager::counter_name(_name_space, "name");

      PerfDataManager::create_string_constant(SUN_GC, cname, name, CHECK);

      cname = PerfDataManager::counter_name(_name_space, "maxCapacity");

      PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_Bytes, (jlong)max_size, CHECK);

      cname = PerfDataManager::counter_name(_name_space, "capacity");

      _capacity = PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, initial_capacity, CHECK);

      cname = PerfDataManager::counter_name(_name_space, "used");

      _used = PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, (jlong) 0, CHECK);

      cname = PerfDataManager::counter_name(_name_space, "initCapacity");

      PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_Bytes, initial_capacity, CHECK);

    }

  }

  ~EpsilonSpaceCounters() {

    if (_name_space != NULL) {

      FREE_C_HEAP_ARRAY(char, _name_space);

    }

  }

  inline void update_all(size_t capacity, size_t used) {

    _capacity->set_value(capacity);

    _used->set_value(used);

  }

};

class EpsilonYoungGenerationCounters : public GenerationCounters {

public:

  EpsilonYoungGenerationCounters() :

          GenerationCounters("Young", 0, 0, 0, (size_t)0, (size_t)0) {};

  virtual void update_all() {

    // no update

  }

};

class EpsilonGenerationCounters : public GenerationCounters {

private:

  EpsilonCollectedHeap* _heap;

public:

  EpsilonGenerationCounters(EpsilonCollectedHeap* heap) :

          GenerationCounters("Heap", 1, 1, 0, heap->max_capacity(), heap->capacity()),

          _heap(heap)

  {};

  virtual void update_all() {

    _current_size->set_value(_heap->capacity());

  }

};

EpsilonMonitoringSupport::EpsilonMonitoringSupport(EpsilonCollectedHeap* heap) {

  // We report young gen as unused.

  _young_counters = new EpsilonYoungGenerationCounters();

  _heap_counters  = new EpsilonGenerationCounters(heap);

  _space_counters = new EpsilonSpaceCounters("Heap", 0, heap->max_capacity(), 0, _heap_counters);

}

void EpsilonMonitoringSupport::update_counters() {

  MemoryService::track_memory_usage();

  if (UsePerfData) {

    EpsilonCollectedHeap* heap = EpsilonCollectedHeap::heap();

    size_t used = heap->used();

    size_t capacity = heap->capacity();

    _heap_counters->update_all();

    _space_counters->update_all(capacity, used);

    MetaspaceCounters::update_performance_counters();

    CompressedClassSpaceCounters::update_performance_counters();

  }

}