1 /*
   2  * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
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  23  */
  24 
  25 #ifndef SHARE_VM_JFR_LEAKPROFILER_SAMPLING_SAMPLEPRIORITYQUEUE_HPP
  26 #define SHARE_VM_JFR_LEAKPROFILER_SAMPLING_SAMPLEPRIORITYQUEUE_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 
  30 class ObjectSample;
  31 
  32 // Priority queue that keeps object samples ordered
  33 // by the amount of allocation they span.
  34 class SamplePriorityQueue : public CHeapObj<mtTracing> {
  35  private:
  36   ObjectSample** _items;
  37   size_t _allocated_size;
  38   int _count;
  39   size_t _total;
  40 
  41   void swap(int i, int j);
  42   void moveDown(int index);
  43   void moveUp(int index);
  44 
  45  public:
  46   SamplePriorityQueue(size_t size);
  47   ~SamplePriorityQueue();
  48 
  49   void push(ObjectSample* sample);
  50   ObjectSample* pop();
  51   const ObjectSample* peek() const;
  52   void remove(ObjectSample* sample);
  53   ObjectSample* item_at(int index);
  54   size_t total() const;
  55   int count() const;
  56 };
  57 
  58 #endif // SHARE_VM_JFR_LEAKPROFILER_SAMPLING_SAMPLEPRIORITYQUEUE_HPP