1/*
2 * Copyright (c) 2017, 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.
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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_JFR_LEAKPROFILER_SAMPLING_SAMPLELIST_HPP
26#define SHARE_JFR_LEAKPROFILER_SAMPLING_SAMPLELIST_HPP
27#include "jfr/utilities/jfrAllocation.hpp"
28#include "jfr/utilities/jfrDoublyLinkedList.hpp"
29
30class ObjectSample;
31
32class SampleList : public JfrCHeapObj {
33 typedef JfrDoublyLinkedList<ObjectSample> List;
34 private:
35 List _free_list;
36 List _in_use_list;
37 const ObjectSample* _last_resolved;
38 mutable size_t _allocated;
39 const size_t _limit;
40 const size_t _cache_size;
41
42 void populate_cache();
43 ObjectSample* newSample() const;
44 void link(ObjectSample* sample);
45 void unlink(ObjectSample* sample);
46 void deallocate_samples(List& list);
47 void reset(ObjectSample* sample);
48
49 public:
50 SampleList(size_t limit, size_t cache_size = 0);
51 ~SampleList();
52
53 void set_last_resolved(const ObjectSample* sample);
54 ObjectSample* get();
55 ObjectSample* last() const;
56 ObjectSample* first() const;
57 void release(ObjectSample* sample);
58 const ObjectSample* last_resolved() const;
59 ObjectSample* reuse(ObjectSample* sample);
60 bool is_full() const;
61 size_t count() const;
62};
63
64#endif // SHARE_JFR_LEAKPROFILER_SAMPLING_SAMPLELIST_HPP
65