src/hotspot/share/jfr/leakprofiler/sampling/samplePriorityQueue.hpp

/*
 * Copyright (c) 2014, 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.
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#ifndef SHARE_JFR_LEAKPROFILER_SAMPLING_SAMPLEPRIORITYQUEUE_HPP
#define SHARE_JFR_LEAKPROFILER_SAMPLING_SAMPLEPRIORITYQUEUE_HPP

#include "memory/allocation.hpp"

class ObjectSample;

// Priority queue that keeps object samples ordered
// by the amount of allocation they span.
class SamplePriorityQueue : public CHeapObj<mtTracing> {
 private:
  ObjectSample** _items;
  size_t _allocated_size;
  int _count;
  size_t _total;

  void swap(int i, int j);
  void moveDown(int index);
  void moveUp(int index);

 public:
  SamplePriorityQueue(size_t size);
  ~SamplePriorityQueue();

  void push(ObjectSample* sample);
  ObjectSample* pop();
  const ObjectSample* peek() const;
  void remove(ObjectSample* sample);
  ObjectSample* item_at(int index);
  size_t total() const;
  int count() const;
};

#endif // SHARE_JFR_LEAKPROFILER_SAMPLING_SAMPLEPRIORITYQUEUE_HPP