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