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. 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_SAMPLELIST_HPP 26 #define SHARE_VM_JFR_LEAKPROFILER_SAMPLING_SAMPLELIST_HPP 27 #include "jfr/utilities/jfrAllocation.hpp" 28 #include "jfr/utilities/jfrDoublyLinkedList.hpp" 29 30 class ObjectSample; 31 32 class 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 void release(ObjectSample* sample); 57 const ObjectSample* last_resolved() const; 58 ObjectSample* reuse(ObjectSample* sample); 59 bool is_full() const; 60 size_t count() const; 61 }; 62 63 #endif // SHARE_VM_JFR_LEAKPROFILER_SAMPLING_SAMPLELIST_HPP