src/share/vm/gc_implementation/shared/generationCounters.hpp

/*
 * Copyright (c) 2002, 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.
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#ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_GENERATIONCOUNTERS_HPP
#define SHARE_VM_GC_IMPLEMENTATION_SHARED_GENERATIONCOUNTERS_HPP

#include "runtime/perfData.hpp"
#include "runtime/virtualspace.hpp"

// A GenerationCounter is a holder class for performance counters
// that track a generation

class GenerationCounters: public CHeapObj<mtGC> {
  friend class VMStructs;

private:
  void initialize(const char* name, int ordinal, int spaces,
                  size_t min_capacity, size_t max_capacity,
                  size_t curr_capacity);

 protected:
  PerfVariable*      _current_size;
  VirtualSpace*      _virtual_space;

  // Constant PerfData types don't need to retain a reference.
  // However, it's a good idea to document them here.
  // PerfStringConstant*     _name;
  // PerfConstant*           _min_size;
  // PerfConstant*           _max_size;
  // PerfConstant*           _spaces;

  char*              _name_space;

  // This constructor is only meant for use with the PSGenerationCounters
  // constructor. The need for such an constructor should be eliminated
  // when VirtualSpace and PSVirtualSpace are unified.
  GenerationCounters()
             : _name_space(NULL), _current_size(NULL), _virtual_space(NULL) {}

  // This constructor is used for subclasses that do not have a space
  // associated with them (e.g, in G1).
  GenerationCounters(const char* name, int ordinal, int spaces,
                     size_t min_capacity, size_t max_capacity,
                     size_t curr_capacity);

 public:
  GenerationCounters(const char* name, int ordinal, int spaces,
                     VirtualSpace* v);

  ~GenerationCounters() {
    if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space, mtGC);
  }

  virtual void update_all();

  const char* name_space() const        { return _name_space; }

};
#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_GENERATIONCOUNTERS_HPP