/*

 * Copyright (c) 2017, 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

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 */

#ifndef SHARE_VM_JFR_LEAKPROFILER_SAMPLING_SAMPLELIST_HPP

#define SHARE_VM_JFR_LEAKPROFILER_SAMPLING_SAMPLELIST_HPP

#include "jfr/utilities/jfrAllocation.hpp"

#include "jfr/utilities/jfrDoublyLinkedList.hpp"

class ObjectSample;

class SampleList : public JfrCHeapObj {

  typedef JfrDoublyLinkedList<ObjectSample> List;

 private:

  List _free_list;

  List _in_use_list;

  const ObjectSample* _last_resolved;

  mutable size_t _allocated;

  const size_t _limit;

  const size_t _cache_size;

  void populate_cache();

  ObjectSample* newSample() const;

  void link(ObjectSample* sample);

  void unlink(ObjectSample* sample);

  void deallocate_samples(List& list);

  void reset(ObjectSample* sample);

 public:

  SampleList(size_t limit, size_t cache_size = 0);

  ~SampleList();

  void set_last_resolved(const ObjectSample* sample);

  ObjectSample* get();

  ObjectSample* last() const;

  void release(ObjectSample* sample);

  const ObjectSample* last_resolved() const;

  ObjectSample* reuse(ObjectSample* sample);

  bool is_full() const;

  size_t count() const;

};

#endif // SHARE_VM_JFR_LEAKPROFILER_SAMPLING_SAMPLELIST_HPP