1 /*
   2  * Copyright (c) 2012, 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_RECORDER_STORAGE_JFRSTORAGECONTROL_HPP
  26 #define SHARE_VM_JFR_RECORDER_STORAGE_JFRSTORAGECONTROL_HPP
  27 
  28 #include "jfr/utilities/jfrAllocation.hpp"
  29 
  30 class JfrStorageControl : public JfrCHeapObj {
  31  private:
  32   size_t _global_count_total;
  33   size_t _full_count;
  34   volatile size_t _global_lease_count;
  35   volatile size_t _dead_count;
  36   size_t _to_disk_threshold;
  37   size_t _in_memory_discard_threshold;
  38   size_t _global_lease_threshold;
  39   size_t _scavenge_threshold;
  40   bool _to_disk;
  41 
  42  public:
  43   JfrStorageControl(size_t global_count_total, size_t in_memory_discard_threshold);
  44 
  45   void set_to_disk(bool enable);
  46   bool to_disk() const;
  47 
  48   size_t full_count() const;
  49   size_t increment_full();
  50   size_t decrement_full();
  51   void   reset_full();
  52   bool should_post_buffer_full_message() const;
  53   bool should_discard() const;
  54 
  55   size_t global_lease_count() const;
  56   size_t increment_leased();
  57   size_t decrement_leased();
  58   bool is_global_lease_allowed() const;
  59 
  60   size_t dead_count() const;
  61   size_t increment_dead();
  62   size_t decrement_dead();
  63 
  64   void set_scavenge_threshold(size_t number_of_dead_buffers);
  65   bool should_scavenge() const;
  66 };
  67 
  68 #endif // SHARE_VM_JFR_RECORDER_STORAGE_JFRSTORAGECONTROL_HPP