1 /*

     2  * Copyright (c) 2014, 2018, 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

    21  * questions.

    22  *

    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